Ascon tecnologic X35 User manual

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 1
X35
DIGITAL ELECTRONIC
REFRIGERATION UNITS
CONTROLLER
OPERATING INSTRUCTIONS
21/11 - cod.: ISTR_M_X35-_E_00_--
ASCON TECNOLOGIC S.r.l.
Viale Indipendenza 56, 27029 - VIGEVANO (PV) ITALY
Tel.: [phone] - Fax: [phone]
http:\\www.ascontecnologic.com
[email protected]
PREFACE
mThis manual contains the information necessary for
the product to be installed correctly and also instruc-
tions for its maintenance and use; we therefore
rEcommend that the utmost attention is paid to the
following instructions and to save it.
This document is the exclusive property of
Ascon Tecnologic
S.r.l. which forbids any reproduction and divulgation, even
partially, of the document, unless expressly authorized.
Ascon Tecnologic S.r.l. reserves the right to make any formal
or functional changes at any moment and without any notice.
Ascon Tecnologic S.r.l. and its legal representatives do not
assume any responsibility for any damage to people, things
or animals deriving from violation, wrong or improper use or
in any case not in compliance with the instrument features.
mWhenever a failure or a malfunction of the device
may cause dangerous situations for persons, thing
or animals, please remember that the plant has to be
equipped with additional electromechanical devices
which will guarantee safety.
INDEX
1. Instrument description ............................................... 2
1.1 General description........................................................... 2
1.2 Front panel description ..................................................... 2
2. Programming ............................................................... 2
2.1 Fast Set Point programming.............................................. 2
2.2 Standard mode parameters programming ........................ 3
2.3 Parameter Protection Using a Password .......................... 3
2.4 Customized mode parameters programming
(parameters programming level) ....................................... 3
2.5 Reset parameters to default value .................................... 4
2.6 Keyboard lock function...................................................... 4
2.7 Setting the current time and date...................................... 4
2.8 Scheduling events at defined times (models with RTC).... 4
2.9 Displaying HACCP alarms (models with RTC) ................. 5
3. Usage Warnings .......................................................... 5
3.1 Admitted usage................................................................. 5
4. Installation warnings................................................... 5
4.1 Mechanical mounting........................................................ 5
4.1.1 Mechanical dimensions [mm] ............................................... 6
4.1.2 Panel cut-out......................................................................... 6
4.1.3 Mounting............................................................................... 6
4.2 Electrical connections ....................................................... 6
4.2.1 Electrical wiring diagram....................................................... 6
5. Functions ..................................................................... 7
5.1 ON/Stand-by function........................................................ 7
5.2 Normal, Eco and Turbo operating modes.......................... 7
5.2.1 “Normal/Eco” mode operation............................................... 7
5.2.2 Turbo/Normal/Eco mode operation....................................... 7
5.4 Digital Inputs ..................................................................... 8
5.5 Outputs and buzzer configuration ..................................... 9
5.6 Temperature control ........................................................ 10
5.7 Compressor protection function and power-ON delay .... 11
5.8 Defrost control................................................................. 11
5.8.1 Starting automatic defrosts................................................. 12
5.8.2 Manual defrost.................................................................... 13
5.8.3 Defrost ends ....................................................................... 13
5.8.4 Defrosts in event of evaporator probe error ........................ 14
5.8.5 Defrost display lock............................................................. 14
5.8.6 Pre- and post-defrost output............................................... 14
5.8.7 Hot-gas defrost in centralized systems............................... 14
5.9 Evaporator fans control................................................... 15
5.10 Alarm functions ............................................................... 16
5.10.1 Temperature alarms............................................................ 16
5.10.2 External alarms (digital inputs) ........................................... 17
5.10.3 Open door alarm................................................................. 17
5.11 HACCP function (alarm recording) ................................. 17
5.11.1 HACCP temperature alarms............................................... 18
5.11.2 HACCP power failure alarms (black-out) ............................ 18
5.11.3 HACCP alarms from digital input........................................ 18
5.12 Functioning of keys and /Aux ................................ 18
5.13 Clock programmable events............................................ 19
5.14 RS485 Serial Interface.................................................... 19
6. Accessories ............................................................... 20
6.1 Parameters configuration by “A01”.................................. 20
6.2 Parameters configuration using an NFC Device ............. 20
6.3 TVR Y remote display ..................................................... 20
7. Programmable parameters table.............................. 21
8. Problems and maintenance...................................... 27
8.1 Notifications .................................................................... 27
8.1.1 Error messages .................................................................. 27
8.1.2 Other messages ................................................................. 27
8.2 Cleaning.......................................................................... 27
8.3 Disposal .......................................................................... 27
9. Warranty and Repairs ............................................... 27
10. Technical data............................................................ 27
10.1 Electrical characteristics ................................................. 27
10.2 Mechanical characteristics.............................................. 28
10.3 Functional features ......................................................... 28
11. How to order .............................................................. 28

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 2
1. INSTRUMENT DESCRIPTION
1.1 General description
The X35 model is a digital electronic microprocessor control-
ler that can be used typically for refrigeration applications.
It has ON/OFF temperature control and defrost control at
defined times (Real Time Clock Defrosting), at time inter-
vals, by arrival at temperature or by length of time of continu-
ous compressor operation through stopping the compressor,
electric heating or hot gas/cycle inversion.
The instrument has up to 4 relay outputs, up to 4 inputs
configurable for PTC, NTC and Pt1000 temperature probes,
and 2 digital inputs. It can be also equipped with an RS485
serial communication interface with MODBUS-RTU com-
munication protocol, a calendar clock (Real Time Clock)
and an NFC interface for parameters programming.
The calendar clock allows to program defrosting events, auxiliary
output switching, control Set Point changes, instrument ON/OFF,
etc. at pre-set times (max. 14 daily and 98 weekly events).
A furher feature of the calendar clock instrument version is
the HACCP function which can store the last 10 occurred
alarms (alarm type, start, duration and temperature peaks).
Two Digital Inputs are always available and, as an alter-
native to Pr3 and Pr4 temperature probe inputs, two other
digital inputs can be configured.
1.2 Front panel description
P
U
X35
1
5
3
2
4
10
9
12 7
13
6
11
8
1. Key: Used to set the Set Point (press and release)
and to program the function parameters (pressed for 5 s).
In programming mode is used to enter at parameters
edit mode and confirm the values. In programming mode
can be used together with the key to change the
programming level of the parameters. When the keyboard
is locked pressed together with the button for 5 s (or
pressed alone for 9 s) key to unlock the keyboard.
2. /Aux Key: In programming mode is used for decreas-
ing the values to be set and for selecting the parameters.
Hold pressed for 1 s, while in Normal mode, it can also be
programmed via parameter t.Fb to carry out other func-
tions such as selecting the Eco mode, activating the Aux
output, etc. (see functions of keys / and /Aux ”).
3. /Key: In Normal mode can be used to start/stop a
manual defrost (pressed for 5 s). In programming mode
is used to increase the value to be set and to select
the parameters. In programming mode, can be used,
together with key to change parameters level. Pressed
together with key for 5 s allows the keyboard unlock.
4. /Key: Press and release the key to display the
instrument variables (measured temperatures etc.). In
programming mode press for 2 s to return in Normal
mode. Hold pressed for 1 s, while in Normal mode, it
can also be programmed via parameter t.uF to carry out
other functions such as turn ON/OFF (stand-by) the de-
vice, activate the Aux output, etc. (see functions of keys
/ and /Aux).
5. LED SET: During the normal operating mode, signals
that a key has been pressed. In programming mode
indicates the programming level of the parameters: not
protected (ON), protected (flashing).
6. LED - COOL: Indicates the control output status (com-
pressor or temperature control device) when the istru-
ment is programmed for cooling operation: on (on), off
(off) or inhibited (flashing).
7. LED - HEAT: Indicates the control output status (com-
pressor or temperature control device) when the istru-
ment is programmed for heating operation: on (on), off
(off) or inhibited (flashing).
8. LED
:Indicates: Defrost in progress (on) or drainage
time in progress (flashing).
9. LED
:Shows the Evaporator Fan(s) output status: on
(on), off (off) or inhibited (flashing).
10. LED
:Shows the Alarm active status (on), off (off) and
Acknowledged or Lached (flashing).
11. LED Aux: Shows the Auxiliary output status: on (on), off
(off) or inhibited (flashing).
12. LED :Indicates that the internal clock is running.
If it is steady lit, the current time is presumably correct.
If flashing slowly, it means that there is a clock error
(clock chip not working).
If flashing rapidly, means the clock battery is drained.
13. LED Stand-By: When the instrument is in Stand-by
mode is the only lit LED.
2. PROGRAMMING
2.1 Fast Set Point programming
The normal mode to program the Set Points is done by mo-
mentarily pressing the key, the display shows SP (or SPE
or SPH) alternated to the programmed value. To change the
value shown press the key to increase its value or to
decrease it.
However, through parameter t.Ed is possible to determine
whether and which Set Points can be modified with the fast
mode. t.Ed is programmable between 0(OFF) and 6:
0. oF - No Set Point can be changed with this procedure
(the pression of the
key has no effect);
1. Only SP (normal Set Point) can be adjusted;
2. Only SPE [Eco (Eco) Set Point] can be adjusted;
3. Both SP and SPE can be adjusted;
4. Only the Active Set Point (SP/SPE) can be adjusted;
5. Can be adjusted SP and SPH (Turbo or, if independent,
the Heating Set Point);
6. Can be adjusted SP, SPE and SPH.
For example, if the parameter t.Ed = 1or 3, the procedure is
as follows:
–Press and release key
, the display shows SP alternated
to its value;
–To modify the Set Point, press the keys
/ to increase/
decrease its value;
–If only the SP (t.Ed = 1) is changeable, once reached the
desired value, press the
key to exit the Set Point pro-
gramming mode;
–If also the SPE is programmable (t.Ed = 3), the procedure
is not ended and at the pressure the instrument does
not exit the Set Point programming procedure, but displays
SPE alternated to its value ready for changes;
–To modify the Eco Set Point, press the keys
/ to in-

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 3
crease/decrease its value;
–Once the desired value is reached press the key
to exit
Set Point programming mode;
–If the Turbo (or independent heating) Set Point can also be
set (t.Ed = 6) by pressing and releasing the key
again,
the display shows SPH alternated with its value. Changes
are made with / keys as for the other Set Points.
Exiting the Set Point programming mode is achieved by
pressing the
key or automatically if no keys are pressed
for about 10 seconds. After that time the display returns to
the normal function mode.
2.2 Standard mode parameters programming
To access the instrument functional parameters when pas-
sword protection is disabled:
–Press the key and keep it pressed for about 5 s, after
which the display shows the code that identifies the first
group of programmable parameters (1st group = ]SP).
–Using the / keys select the desired parameters group,
then enter in that group pressing the key, the display
starts showing the code of the first parameter of the group.
–Using the / keys select the desired parameter and,
pressing the key, enter the change parameter mode
(the display alternately shows the parameter code and
its setting value) that allows to change the parameter
value with the and keys.
–Once the desired value has been set, press the key again:
the new value will be stored and the indstrument returns to
the group parameter list showing only the parameter code.
–Pressing the / keys it is possible to select another
parameter and change it as described.
–To return to the “Group selection mode” keep the key
pressed for 1 s until the instrument shows the group code.
–With / keys it is possible to select another group of
parameters and repeat the changing sequence.
–To exit the programming mode, press no keys for about 30 s
or keep the key pressed for 2 s until the controller exits
the programming mode.
PARAMETERS
(PROGRAM MODE)
PARAMETERS GROUP
(PROGRAM MODE)
SET PARAMETER
Previous
Parameter
Next
Parameter
Increase
Value
Decrease
Value
-50.0s.ls.
-25.5
NORMAL MODE
Hold
for 2 s
Hold
for 5 s
Previous
Group
Next
Group
]SP
Hold
for 2 s
2.3 Parameter Protection Using a Password
The instrument has a parameter protection function with a
password that can be customized using the t.PP parameter.
To protect the parameters, set the desired Password Number
at parameter t.PP and exit the programming procedure.
When the protection is active, keep the
key pressed for
about 5 s, after which the display shows r.P. Press again ,
the display shows 0.
Now, using the
/ keys, set the programmed password
number and press again the key.
If the password number inserted is correct, the display shows
the code that identifies the first group of programmable pa-
rameters and it will be possible to program the instrument in
the same ways described in the previous paragraphs.
The password protection can be disabled setting t.PP = oF.
PARAMETERS
(PROGRAM MODE)
INS. CORRECT
PASSWORD
0.R.P.
-25.5
PASSWORD
REQUEST
]
.Sp
NORMAL MODE
Hold
for 2 s
Hold for 5 s Increase
Value
Decrease
Value
Notes: 1. All parameters are configured by default as “pro-
tected” so that by simply setting the t.PP param-
eter they are all password protected.
2. If the Password gets lost, just switch OFF and
ON the instrument supply, push key during the
initial test and keeping the key pressed for 5 s.
In this way it is possible to have access to all the
parameters, verify and modify the parameter t.PP.
2.4 Customized mode parameters programming
(parameters programming level)
The password protection hides all the configuration pa-
rameters behind a factory set password to avoid unwanted
changes being made to the controller set up.
To make a parameter accessible without having to enter the
password when t.PP password protection is activate follows
this procedure:
–Enter the programming mode using the t.PP Password,
select the parameter that must be accessible with no pass-
word protection.
–Once the parameter has been selected, if the SET LED
blinks means that the parameter is programmable by
entering the password (is protected), if the SET LED is
steady lighted means that the parameter is programmable
without password (is not protected).
–To change the parameter visibility, press the key and keep-
ing it pressed also press the key. The SET LED changes
its state indicating the new parameter access level
(on = not protected; blinking = protected by password).
In case some parameters are not protected, accessing the
programming mode the display first shows the not protect-
ed parameters, then the r.p parameter and, after inserting
the password number, will be possible to access the pro-
tected parameters.
Previous
Parameter
Next
Parameter
SET
PA RAMETER
Increase
Value
Decrease
Value
35.0
-25.5
NOT Protected
PA RAMETERS
NORMAL MODE
Hold
for 2 s
Hold for 5 s
PARAMETERS
GROUP
(PROGRAM MODE)
INS. CORRECT
PASSWORD
Increase
Value
Decrease
Value
0.R.P.
PASSWORD
REQUEST
]SP
a.HI.
With regard to setting unprotected parameters, an exception
is HACCP alarm-related parameters (H.01, H.02 etc. which
are visible only when there are alarms stored in memory)
whose display level can be set via the t.HA parameter.
If t.HA = 1the parameters related to stored HACCP alarms

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 4
are visible only within the ]HA group (which can be displayed
like all other groups without a password if t.PP = oF or by
entering the selected t.PP password).
If t.HA = 2the parameters related to stored HACCP alarms
are visible both within the ]HA group (which can be dis-
played like all other groups without a password if t.PP = oF
or by entering the selected t.PP password) and as unpro-
tected parameters also if the password is active.
2.5 Reset parameters to default value
The instrument allows the reset of the parameters to those
values programmed in factory as default.
To restore the default parameters value set value -48 at r.p
password request.
Therefore, to make the reset to the default parameters, en-
able the Password using the t.PP parameter so that the r.p
setting is requested, at this point insert -48 instead of the
programmed access password number.
Once confirmed the password with the
key the display
shows “---” for 2 s after which the instrument resets all the
parameters to the factory default setting.
2.6 Keyboard lock function
On the instrument it is possible to completely lock the key-
board. This function is useful when the controller is in an
accessible area and changes must be avoided.
To activate the keyboard lock it is enough program the pa-
rameter t.Lo to a value different than oF.
The t.Lo value is the keys inactivity time after which the key-
board will be automatically locked.
Therefore, pressing no buttons for the time set at t.Lo, the
instrument automatically disable the normal keys functions.
When the keyboard is locked, if any of the key is pressed the
display shows LnLn to point out that the lock is active.
To unlock the keyboard it is enough to contemporarily press
+ keys and keep them pressed for 5 s (or the key
alone for 9 s), after which the label LFLF appears on the dis-
play and all the key functions will be available again.
2.7 Setting the current time and date
When the instrument is equipped with the internal calendar/
clock, this must be enabled and programmed to the current
time and day of the week using the c.CL parameter and to
the current date using the c.dt parameter.
After the c.CL parameter has been selected, press the
key
repeatedly to cycle through the following options:
h. + 2 digits for the hour of day in 24h format (e.g.: h.13);
n. + 2 digits for the minutes (e.g.: n.45);
d. + 1 digit for the day of the week (e.g.: d. 1);
oF Clock disabled.
The days of the week are numbered as follows:
d. 1 Monday;
d. 2 Tuesday;
d. 3 Wednesday;
d. 4 Thursday;
d. 5 Friday;
d. 6 Saturday;
d. 7 Sunday.
After selecting the c.dt parameter, press the
key repeat-
edly to cycle through the following options:
y. + 2 digits for the current year (e.g.: y.10);
M.+ 2 digits for the and current month (e.g.: M.05);
d. + 2 digits for the and current date (e.g.: d.31).
Increase
Value
Decrease
Value
Increase
Value
Decrease
Value
SET DAYSET MINUTES
Increase
Value
Decrease
Value
N.45h.13
SET HOUR
D. 1c.cl
CLOCK/CALENDAR
PA RAMETERS
Increase
Value
Decrease
Value
Increase
Value
Decrease
Value
SET DATESET MONTH
Increase
Value
Decrease
Value
y.10
SET YEAR
d.31c.DT
When the internal clock is running, the LED is lighted.
2.8 Scheduling events at defined times
(models with RTC)
The events are programmable through the 14 parameters
(c.01... c.14) contained in the ]CE group.
Exactly as for current time, because the parameters for time-
related functions require multiple values to be input, these
parameters are programmed in the following way:
After selecting the desired parameter, press the
key re-
peatedly to cycle through the following parameters:
h. + 2 digits for the hour of day in 24h format (e.g.: h.13);
n. + 2 digits for the minutes of the hour (e.g.: n.40);
d. + 1 digit for the day of the week (e.g.: d. 1);
t.. + 1 digit for the event type to be executed at the
programmed time (e.g.: t. 5).
The days of the week are numbered as follows:
d. 1 Monday;
d. 2 Tuesday;
d. 3 Wednesday;
d. 4 Thursday;
d. 5 Friday;
d. 6 Saturday;
d. 7 Sunday;
d. 8 Every day;
d. 9 Monday, Tuesday, Wednesday, Thursday, Friday;
d.10
Monday, Tuesday, Wednesday, Thursday, Friday, Saturday;
d.11 Saturday and Sunday;
d.oF No day (event disabled).
The instrument offers 14 event programming parameters,
allowing a maximum of 14 x 7 = 98 weekly events to be
scheduled (using d. 8).
For the event types that can be programmed, see the rel-
evant paragraph.
Previous
Event
Next
Event
SET MINUTES
N.40h.13
SET HOUR
Increase
value
Decrease
value
Increase
value
Decrease
value
c.01
]ce PA RAMETERS
EVENT TYPE
d. 1
SET DAY
T. 5
GROUP ]ce
Increase
value
Decrease
value
Increase
value
Decrease
value

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 5
2.9 Displaying HACCP alarms
(models with RTC)
The HACCP (Hazard Analysis and Critical Control Points)
function causes the instrument to record the last 10 alarms
that have occurred together with the information useful to de-
termine the criticality of the alarm. The function is available
only for those instruments equipped with the calendar clock.
The following HACCP alarms can be stored in memory:
HACCP alarm code Alarm
H1 Maximum temperature alarm H1
L1 Minimum temperature alarm L1
H2 Maximum temperature alarm H2
L2 Minimum temperature alarm L2
bo Power failure alarm (black-out)
AL Alarm from digital input
These Alarms are displayed using the same procedure as
for programming the parameters (parameters H.01 ÷ H.10
inside ]HA group).
As for the events scheduling or the time set, the time-related
functions parameters require multiple values to be input, also
the HACCP Alarms information are inserted in various field that
are to be scrolled to be displayed.
The Alarms info are contained in the ]HA group. To access
the alarm list, press the key while the instrument displays
]HA group acronym, to select the desired alarm (H.01... H.10)
use the / keys, then, press repeatedly to display the
alarm information (alarm code, time etc.).
The instrument shows:
–Alarm type (A. + 2 digits of the HACCP alarm code);
–Alarm start time HACCP
(y. = year, M. =month, d. = day, h. = hours, n. = minutes);
–HACCP alarm duration (E. = hours, e.= minutes);
–Critical temperature
(max. peak if Hi alarm or min. peak if Lo or other alarm).
These parameters are automatically sorted by the instru-
ment from the most recent (H.01) to the oldest (H.10) every
time an alarm is recorded or an alarm is canceled.
If the alarms exceed the number of 10, the instrument
deletes the data relating to the oldest alarm by overwriting
them with the information of the most recent one.
When this occurs, the instrument increases the value of
the H.dL parameter by one unit through which it is possible
to view the number of alarms that the instrument has been
forced to delete because they exceed the allowed memory.
Once the alarm parameter to be viewed has been selected,
the flashing label means that the alarm has never been dis-
played (therefore acknowledged).
To acknowledge an alarm, simply access the parameter
using the
key and view it. At the next display, the label of
the parameter will be fixed.
If the alarm is still in progress at the time of display, data are
shown but the alarm is not acknowledged.
In the presence of unacknowledged HACCP alarms (there-
fore also in progress) the instrument shows the HAC mes-
sage on the display alternated with the normal display.
Within the parameter, the data will be displayed sequentially
through subsequent presses of the
button. The alarm
is canceled if the button is held down for more than 5 s
while viewing one of the alarm data.
Similarly, it is possible to reset the value of the H.dL param-
eter by keeping the key pressed for more than 5 s while
the display shows the number of cleared alarms.
As regards the configuration and operation of the HACCP
alarms, see the relative paragraph.
Previous
Alarm
Next
Alarm
START MONTHSTART YEAR
y.12a.H1
ALARM TYPE
H.01
HACCP ALARMS
START MINUTESSTART HOUR
d.31
START DATE
n.40
Hi/Lo TEMP. PEAK
e.05
AL.ENDURANCE
(h)
AL.ENDURANCE
(min)
12.5
h.06
GROUP ]HA
3. USAGE WARNINGS
3.1 Admitted usage
m The instrument has been projected and manufactured
as a measuring and control device to be used accord-
ing to EN60730-1 at altitudes operation below 2000 m.
The use of the instrument for applications not expressly
permitted by the above mentioned rule must adopt all the
necessary protective measures.
The instrument MUST NOT BE USED in dangerous environ-
ments (flammable or explosive) without adequate protection.
The instrument used with NTC 103AT11 probe (identifiable
by the printed code “103AT-11” visible on the sensor part) or
Pt1000 is compliant with standard EN 13485 (“Thermom-
eters for measuring the air and product temperature for the
transport,storage and distribution of chilled, frozen, deep-
frozen/quick-frozen food and ice cream”) with the following
classification: [EN13485 air, S, A, 1,- 50°C +90°C].
Remember that the end user must periodically check and veri-
fy the thermometers in compliance with standard EN 13486.
The installer must ensure that EMC rules are respected, also
after instrument installation, if necessary using proper filters.
4. INSTALLATION WARNINGS
4.1 Mechanical mounting
The instrument, in case 78 x 35 mm, is designed for flush-
in panel mounting. Make a hole 71 x 29 mm and insert the
instrument, fixing it with the provided special brackets.
In order to obtain the declared front protection degree use the
screw type bracket (optional).
Avoid placing the instrument in environments with very high
humidity levels or dirt that may create condensation or intro-
duction of conductive substances into the instrument.
Ensure adequate ventilation to the instrument and avoid
installation in containers that house devices which may
overheat or which may cause the instrument to function at a
higher temperature than the one permitted and declared.
Connect the instrument as far away as possible from sourc-
es of electromagnetic disturbances such as motors, power
relays, relays, solenoid valves, etc.

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 6
4.1.1 Mechanical dimensions [mm]
P
U
X35
35
78
28
12.2
664
Blue: Fixed terminals
Red: Removable terminal
s
4.1.2 Panel cut-out
15 mm min.
12 mm min.
71+0.6 mm
29
+0.6
Recommended
panel cutout
4.1.3 Mounting
Panel max. 12 mm (#1) max. 29 mm (#2)
“Butterfly” type
brackets (#1)
Screw type
bracket (#2)
34
4386
4.2 Electrical connections
Carry out the electrical wiring by connecting only one wire to
each terminal, according to the following diagram, checking
that the power supply is the same as that indicated on the
instrument and that the load current absorption is no higher
than the maximum electricity current permitted.
As the instrument is built-in equipment with permanent con-
nection inside housing, it is not equipped with either switches
or internal devices to protect against overload of current: the
installation will include an overload protection and a two-
phase circuit-breaker, placed as near as possible to the in-
strument, and located in a position that can easily be reached
by the user and marked as instrument disconnecting
device which interrupts the power supply to the equipment.
It is also recommended that the supply of all the electrical
circuits connected to the instrument must be properly pro-
tected, using devices (ex. fuses) proportionate to the circulat-
ing currents.
It is strongly recommended that cables with proper insula-
tion, according to the working voltages and temperatures are
to be used.
Furthermore, the probe input cable must be kept separate
from line voltage wiring.
When a probe shielded cable is used, the protection shield
should be connected to ground at only one side.
For the electrical supply of the G(12... 24 VDC) type instru-
ments it is recommended to use an external TCTR transformer,
or with equivalent features and to use a transformer for each
instrument because there is no insulation between input and
power supply.
For the Xversion of the instrument (12 VDC power supply) it
is necessary to use a power supply capable of supplying the
indicated voltage.
m We recommended that a check should be made that
the parameters are those desired and that the ap-
plication functions correctly before connecting the
outputs to the actuators so as to avoid malfunctioning
that may cause irregularities in the plant that could
cause damage to people, things or animals.
4.2.1 Electrical wiring diagram
1234567891011 12 13 1415 16
Internal
Buzzer
Pr1 Pr2
DI1DI2 D+ D- GND
Pr3 Pr4
DI3DI4
Power
supply
Outputs
Inputs
RS485
2 A Gen.Use
10 A Res.
12 A Res. 30 LRA / 5 FLA
UL
X35-
Out2:
Out1:
Out3,4:
8 (3) A
16 (9) A10 (4) A
4 (4) A
2 (1) A5 (1) A
EN
61810
EN
60730 10
5
cycles, 0 ÷ 50°C
1718 1920 21 2223 2425 2627 28
NO
NO NO NO
NC
C
Out2
C
Out1
C
Out3
C
Out4
Serial
interface

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 7
5. FUNCTIONS
5.1 ON/Stand-by function
The instrument, once powered up, can assume 2 different
conditions:
– ON: The controller uses the control functions.
– Stand-by: The controller uses no control function and the
display is turned OFF except for the Stand-by LED.
The transition between Standby and ON status is equivalent
to power ON the instrument providing the electrical power.
If a power failure occours, when the voltage returns the system
always sets itself in the condition it was in before the black-out.
The ON/Stand-by function can be selected:
–Pressing the key
/ for at least 1 s if parameter
t.UF = 3or 5;
–Pressing the key
/AUX for at least 1 s if parameter
t.Fb = 3or 5;
–Using the digital input if parameter i.oF= 7or 15
(where ocan be 1... 4);
–By programming a programmable event through the clock
(if present).
5.2 Normal, Eco and Turbo operating modes
The instrument allows to pre-set up to 3 control Set Points:
SP Normal Set Point;
SPE Eco (economical) Set Point;
SPH Turbo Set Point.
Associated with each of them is the relative differential (hys-
teresis):
r.d Normal mode differential;
r.Ed Eco mode differential;
r.Hd Turbo mode differential.
The switching between these modes can be automatic or manual.
5.2.1 “Normal/Eco” mode operation
Thi operation mode can be used where it is necessary to
switch between two different operating temperatures
(e.g.: day/night or working days/holidays).
Normal/Eco mode can be selected manually:
–Pressing the
/ key if parameter t.UF = 2;
–Pressing the
/AUX key if parameter t.Fb = 2;
–By a digital input if parameter i.oF= 6
(where ocan be 1... 4);
Normal/Eco mode can be selected automatically:
–After the door has been closed for time i.Et (switching
from Normal to Eco);
–When the door is opened if the SPE Set Point is active
from parameter i.Et (switching from Normal to Eco);
–After the door has been closed for time i.tt since activa-
tion of the SPE Set Point from parameter i.Et (switching
from Eco to Normal);
–At defined times through the clock by programming events
t.6 (switch to Eco mode) and t.7 (switch to Normal mode).
For further information see the paragraph on programming
events through the clock.
Temp.
SPE
SP
Door
r.d
r.Ed
i.Et
time“Norm.”
DAY (Shop open) DAY (Shop open)NIGHT (Shop closed)
“Norm.” “ECO”
Pr1
Example of automatic switching between Eco mode and
Normal mode. During working hours the door is frequently
opened and the controller remains in Normal mode. When
the door has not been opened for time i.Et, the control-
ler switches to Eco mode. As soon as the door is opened
again, the controller reverts to Normal mode.
This function requires use of a digital input configured as
i.oF= 1, 2or 3(door open input).
If i.Et = oF the Eco/Normal mode selection via the digital
input configured as door, is disabled.
If i.tt = oF the Eco/Normal mode switching due to time-out
is disabled.
When switched in Eco mode, the label Eco is displayed.
If i.dS = Ec the display always shows the label Eco when the
instrument is in Eco mode. Otherwise the label Eco appears
approximatively every 10 seconds alternated with the normal
display set by the i.dS parameter.
The Eco mode selection is always combined with the turn
OFF the Auxiliary output function when used as a shop win-
dow light (o.Fo = 3).
Temp.
SPE
SP
r.d
r.Ed
i.tt (2) i.Et
time
i.Et (1)
Pr1
“Normal” “Normal”“ECO”
Notes: 1. i.Et time is reset all the times the door is opened.
In the case shown, the door is always closed.
2. i.tt time stops when the door is opened and
the
instrument immediately switches to Normal mode.
In the case shown, the door is always closed.
5.2.2 Turbo/Normal/Eco mode operation
Turbo mode can be selected manually:
–Pressing the
/ key if parameter t.UF = 4;
–Pressing the
/AUX key if parameter t.Fb = 4;
–By a digital input if parameter i.oF= 8
(where ocan be 1... 4).
Turbo mode can be selected automatically:
–Leaving Eco mode (only if r.HC = C3);
–Every time the instrument is turned ON (only if r.HC = C3
and Pr1 > SPE + r.Ed)
.
The instrument quits Turbo mode automatically when r.tC
time has elapsed or Turbo mode can be manually ended
using the programmed command (key or digital input); the
instrument always returns to Normal mode.
Turbo mode can be applied manually, for example when the
user wishes to lower the temperature of the products quickly
after loading the refrigerator. However, Turbo mode is ap-
plied automatically to restore product temperature at the end
of Eco mode.

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 8
Setting r.HC = C3 gives the following operating cycle:
Temp.
SPE
Eco
SP
SPH
T
urbo
r.Hd
r.Ed
i.tt (2) r.tCr.tC
time
Normal TurboECOTurbo
i.Et (1)
r.d
r.Hc = C3
Pr1
Notes: 1. i.Et time is reset all the times the door is opened.
In the case shown, the door is always closed.
2. i.tt time stops when the door is opened and
the
instrument immediately switches to Normal mode.
In the case shown, the door is always closed.
When switched ON, the instrument starts in the same mode
it was in when it was switched OFF (Normal or Eco) unless
the temperature at switch-on is higher than SPE + r.Ed. In
this case (see the previous figure) a Turbo cycle is automati-
cally started. After the r.tC time has elapsed, the instrument
automatically switches to Normal mode.
If the door is frequently opened the instrument remains in
Normal mode. If however the door is not opened for i.Et
time, it automatically switches to Eco mode. The instrument
remains in Eco mode until the door is opened again or, if set,
until the i.tt time-out has elapsed.
When leaving Eco mode, the instrument therefore runs a
Turbo cycle to allow the product temperature to be restored,
after which it reverts to Normal mode and so on.
When Turbo mode is ON, this is indicated by the characters
trb shown on the display alternated with the normal display.
The Normal SP Set Point can be set between the values
stored for S.LS and S.HS parameters (S.LS < SP < S.HS), Eco
Set Point SPE can be set between the values of SP and S.HS
(SP < SPE < S.HS) and the Turbo Set Point SPH can be set
between the values of S.LS and SP (S.LS < SPH < SP).
Note: In the examples that follow, the Set Point is generically
indicated as SP and the histeresis as r.d, however, op-
erationally, the instrument will act on the basis of the
Set Point and of the histeresis selected as active.
5.3 Measure inputs and display configuration
All parameters concerning measuring inputs are contained in
the ]In group.
With i.SE parameter it is possible to select the type of probe
connected to the instrument. Admitted types: thermistors
PTC KTY81-121 (Pt), NTC 103AT-2 (nt) or Pt1000 (P1).
With i.up parameter it is possible to select the temperature
measurement unit and resolution (C0 = °C/1°; C1 = °C/0.1°;
F0 = °F/1°; F1 = °F/0.1°).
The instrument allows the measuring to be calibrated, that
can be used for re-calibrating the instrument according to
application needs, through parameters i.C1 (for Pr1 input),
i.C2 (for Pr2), i.C3 (for Pr3) and i.C4 (for Pr4).
The usage of Pr2, Pr3 and Pr4 probes is defined by param-
eters i.P2, i.P3 and i.P4. These can be configured for the
following functions:
EP Evaporator Probe: used to manage the defrost and
the evaporator fans (see the relative paragraph);
Au Auxiliary Probe: can be used as a display-only probe
but it is also possible to assign it temperature alarms
(possible usages: product, antifreeze probe, etc.);
cd Condenser Probe: can be used as a display-only
probe but it is also possible to assign it temperature
alarms in order to signal condenser malfunctions
alarms (e.g. dirty/clogged condenser);
2E Evaporator Probe 2: The probe performs the func-
tions described later for controlling defrosts in the
second evaporator of twin-evaporator plants;
dG Digital input (see the Digital inputs functions);
oF Input not used, when Pr2 and/or Pr3 and/or Pr4 is/
are not used, set i.P2, i.P3, i.P4 to oF.
It is not possible to program more inputs for the same func-
tion (priority goes to lowest number input).
With i.Ft parameter it is possible to set a software filter related
to the input value measurement in order to decrease the sensi-
bility to rapid temperature variations (increasing the time).
With i.ds parameter it is possible to establish what is normally
shown on the display:
P1 Pr1 probe measurement;
P2 Pr2 probe measurement;
P3 Pr3 probe measurement;
P4 Pr4 probe measurement;
SP Active Set Point;
Ec The Pr1 probe measurement in normal mode and the
label Eco when in Eco mode;
oF Diplay switched OFF.
With i.CU parameter it is possible to program a measure
offset that is applied only to the temperature shown on the
display when i.dS= P1, P2, P3, P4, Ec (not to the control).
The corrections to the probe measurements applied to he
control procedure are those of calibration parameters.
Regardless of what has been set at i.dS parameter, it is
possible to view all the measurement variables by ciclically
pressing and releasing the
key. The display will alternate-
ly show the code that identifies the variable (see below) and
its value. The variables that can be displayed are:
Pr1 + Pr1 probe measure;
Pr2 + Pr2 probe measure;
Pr3 + Pr3 probe measure (oN/oF status if digital input);
Pr3 + Pr3 probe measure (oN/oF status if digital input);
Lt + The lowest temperature measured by Pr1 probe;
Ht + The highest temperature measured by Pr1 probe.
and, if the real time clock is enabled:
h. + 2 digits for the actual hour;
n. + 2 digits for the actual minutes;
d. + 2 digits for the actual day;
When the instrument is switched OFF, Pr1 peak values are
always reset. It is also possible to manually reset these
values pressing the key
for 3 s during peak visualization.
The display will show “---” and peak memory will be reset.
The istrument automatically exits the display variable mode
15 seconds after the last pressure on the
key.
Please remember that Pr1 probe data visualisation can be
changed by the defrost display lock function (parameter d.dL
see the Defrost function).
5.4 Digital Inputs
All parameters concerning the Digital Inputs are contained in
the ]In group.
The instrument has 2 voltage-free digital inputs whose func-
tion are defined by parameters i.1F and i.2F and whose
action can be delayed by the time period set with parameters

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 9
i.1t and i.2t.
In addition, the instrument may have 2 further voltage-free
digital inputs as an alternative to the measurement inputs
Pr3 and Pr4. In order to use these inputs digitally, the user
must set the relevant parameters i.P3 and/or i.P4 = dG.
The function performed by these digitally configured inputs
is defined by parameters i.3F and i.4F while their action is
instantaneous and cannot be delayed.
The parameters i.1F, i.2F, i.3F, i.4F can be configured for
the following functions:
0 No function;
1 Cell door opening sensor with NO contact: at input
closure the instrument alternately displays oP and the
variable set at i.dS parameter. This Digital Input func-
tion starts also the timer set with parameter A.oA elapsed
which the Open Door Alarm is activated. In addition, at
door opening, the controller returns to Normal mode if it
was in Eco mode and the Eco mode had been activated
by i.Et parameter;
2 Cell door opening sensor with fan stop with NO contact:
Similar to i.
o F= 1, but with fans stop function. Once
elapsed the A.oA interval the controller activates the Door
open Alarm and restarts the fans.
3 Cell door opening sensor with compressor and fan stop with
NO contact: Similar to i. o F= 2, but with compressor stop.
Once elapsed the A.oA interval the controller activates the
Door open Alarm and restarts the fans and the compressor;
4 External alarm signal with NO contact: at input closure the
alarm is activated and the instrument alternately shows
AL and the variable set at parameter i.dS.
5 External alarm signal with all control outputs disabled with
NO contact: at input closure the alarm is activated, all the
control output are disabled and the instrument alternately
shows AL and the variable set at parameter i.dS;
6 Normal/Eco mode selection with NO contact: at input
closure the Eco mode is activated. When instead the
contact is open Normal mode is activate.
7 Instrument ON/OFF (stand-by) selection with NO contact:
at input closure the instrument is switched ON while it is
placed in Stand-by mode when the digital input is open;
8 Turbo activation command with NO contact: at input clo-
sure the instrument starts a Turbo cycle;
9 AUX auxiliary output remote command of with NO contact:
at input closure the instrument activates the auxiliary
output as described in the o.Fo = 2operating mode of the
auxiliary output.
10 Disable recording of HACCP alarms with NO contact:
at input closure the instrument disables the recording of
HACCP alarms;
11 Reset recording of HACCP alarms with NO contact: at input
closure the instrument deletes all recorded HACCP alarms.
12 External PrA alarm signal and ot output disabled by
NO contact: at input closure the instrument deactivates
the output configured as ot and activates the alarm, the
instrument display shows PrA alternated with the variable
defined at i.dS parameter;
13 External HP alarm signal and ot output disabled by NO
contact:
at input closure the instrument deactivates the
output configured as ot and activates the alarm, the
instrument display shows HP alternating with the variable
defined at i.dS parameter.
14 External LP alarm signal and ot output disabled by NO
contact:
at input closure the instrument deactivates the
output configured as ot and activates the alarm, the
instrument display shows LP alternated with the variable
defined at i.dS parameter.
15 Forcing a programmed Switch-ON/Switch-OFF (Stand-
by) event with NO contact: the input closure of at least 1 s
switches the instrument from the ON to the Stand-by state
and vice-versa, until the next event. Therefore, if switch-
on/stand-by events are programmed using the clock, this
operation mode forces the state until the next event.
16 Defrost activation command with NO contact: at input
closure the instrument starts a defrost cycle;
17 End-Defrost command with NO contact: at input closure
if the defrost cycle is in progress the instrument stops it,
otherwise inhibits the defrost start;
18 Turbo cycle command with NO contact and mono-stable
command: at input closure the instrument starts a Turbo
cycle. Turbo mode remains active since the Digital Input
remains active and the r.tc time is elapsed. If the con-
tact is opened during r.tc time counting, the Turbo cycle
is interruppted. Elapsed the r.tc time count, in order to
start a new Turbo cycle it is necessay de-activate then
re-acivate the Digital Input.
19 Inhibition of events programmed by clock.
-1, -2, -3 etc.
Features identical to the above but obtained through
a NC contact and a reversed logic operation.
Note: Where multiple digital inputs are configured for the
same function, the instrument will treat the contacts
as if they were parallel (and consequently regard the
result as an OR function).
5.5 Outputs and buzzer configuration
All parameters concerning the outputs configuration are
contained in the ]Ou group.
The instrument outputs can be configured using parameters
o.o1, o.o2, o.o3, o.o4.
The outputs can be configured for the following functions:
ot Controls the compressor or however, the temperature
control device;
dF Controls the first defrost device;
Fn Controls the evaporator fans;
Au Controls the auxiliary device;
At Controls a silenceable alarm device through a contact
that is normally open and then closed when in alarm;
AL
Controls an alarm that cannot be silenced through a
contact that is normally open and closed when in alarm;
An Controls an alarm with a memory function through a
contact that is normally open and closed when in alarm.
-t Control a silenceable alarm device through a contact
that is normally closed and then open when in alarm;
-L
Control an alarm that cannot be silenced through a
contact that is normally closed and open when in alarm;
-n Control an alarm with a memory function through a
contact that is normally closed and open when in alarm;
on For controlling a device that must be active when the
instrument is ON. The output is therefore disabled
when the instrument is not powered or is in stand-by.
This mode of operation can be used as a lighting con-
trol for the showcase, anti-fog heaters or other utilities;
HE For controlling the heating device in neutral zone con-
trol mode (r.HC = nr);
2d Controls the second defrost device;

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 10
L1 Shop light output managed by Normal/Eco mode. The
output is ON in Normal mode and OFF in Eco mode
operation.
L2 Cell
internal light output managed by digital input. The
output is always OFF, it turns ON only from digital input
configured as door opening (i.oF= 1, 2, 3);
oF No function (Output disabled).
When the outputs are deactivated (o.o
o = oF), they can be
controlled from the serial port at the following addresses:
Hex. Address Description Output status
28E
Enable/Disable
OUT1 when o.o1 = oF
0 = Disable output;
1 = Enable output.
28F
Enable/Disable
OUT2 when o.o2 = oF
0 = Disable output;
1 = Enable output.
290
Enable/Disable
OUT3 when o.o3 = oF
0 = Disable output;
1 = Enable output.
291
Enable/Disable
OUT4 when o.o4 = oF
0 = Disable output;
1 = Enable output.
If one of the outputs is configured as Auxiliary (o.oo= Au) its
function is defined by the parameter o.Fo and the function is
conditioned by the time set at parameter o.tu.
The parameter o.Fo can be configured for:
oF Auxiliary output not active;
1 Control output with delayed activation: the auxiliary output
is activated after o.tu delay time from ot output activa-
tion; the auxiliary output is then turned OFF when ot is
disabled. This working mode can be used as a command
for a second compressor or other utilities with the same
ot output conditions, but which must be delayed after the
compressor start up to avoid excessive current absorption;
2 Output activated by front key ( /or /AUX), Digital Input
or Real Time Clock: the output is activated by pressing a key
or when suitably configured (t.UF or t.Fb = 1) or by a
digital input command if configured (i. o F= 9) or by an RTC
event. The commands by key or digital input have a bi-
stable (toggle) function. Bi-stable means that the 1st com-
mand turns ON the output, while the 2nd turns the output
OFF. In this mode, the AUX output can be turned OFF
automatically after the time set at o.tu parameter. When
o.tu = oF the output is activated and disabled only manu-
ally using a key ( or ), Digital Input or RTC ON/OFF
event, otherwise, the output, once activated, is turned
OFF automatically after the o.tu time. This function can
be used to manage, for example, the cell light, anti-fog
resistances or other utilities. If AUX output ON/OFF events
are programmed by Real Time Clock, the action of the
keys or Digital Input (in this AUX output mode) forces
output status until the next event.
3
Intake solenoid valve output. The output is used to control
the Hot-Gas intake valve in centralized systems (d.dt = HG)
defrost mode. The output configured in this way is perma-
nently activated during the temperature control operation,
while it is disabled during defrost and post-defrost to avoid
the introduction of hot gas into the intake line.
The internal buzzer can be configured with parameter o.bu
for the following functions:
oF Buzzer always disabled;
1 The buzzer is activated only to signal alarms;
2 The buzzer is activated briefly only to signal the keys
pressure (it does not signal alarms);
3 The buzzer is activated both to signal the alarms and the
keys pressure.
5.6 Temperature control
All parameters concerning the Temperature control functions
can be found in the ]re group.
The instrument control method is of ON/OFF type and acts
on the outputs programmed as ot and HE in response to:
Pr1 probe measurement, Set Point(s) SP (or SPE and/or
SPH) value(s), Intervention differential r.d (or r.Ed and/or
r.Hd) value and r.HC the operating mode.
Via the parameter r.HC the following functions can be obtained:
CCooling or HHeating
Depending on the function mode programmed with
parameter r.HC the differential is automatically consid-
ered by the controller with positive values for Cooling
control (r.HC = C) or negative values for Heating control
(r.HC = H).
SP
Temp.
r.d
time
offoff
SP r.d
time
ON
rHC
= C
rHC
= H
offoffON ON ON ON ON
Output
ot
Output
ot
Pr1
Temp.
Pr1
nr Neutral Zone or Cooling and Heating a single Set Point
When r.HC = nr, the output configured as ot operates
with a Cooling action (like r.HC = C) while the output
configured as HE operates with a heating action; both
the actions use the active Set Point (SP/SPE/SPH).
The intervention differential (r.d/r.Ed/r.Hd) is automati-
cally assumed by the controller to have positive values
for the Cooling action and negative values for the
Heating action.
SP
off off
ON
Temp.
time
r.d
r.d
offoff
r.Hc
= nr
ON
ON
HE
ot
Outputs
Pr1
HC Cooling and Heating with two independent Set Points
As in the previous case, when r.HC = HC the output
configured as ot operates with Cooling action (like
r.HC = C) while the output configured as HE operates
with Heating action. In this case, however, the Set
Point for the ot output is the active one (SP/SPE/SPH)
while for HE output the Set Point is SPH. The inter-
vention differential for ot output is the active differen-
tial (r.d/r.Ed/r.Hd) and is automatically assumed by the
controller to have positive values for the Cooling action
while for the output HE the differential is r.Hd consid-
ered with negative values as for the Heating actions.
In this mode, the activation of the Turbo cycle causes
the instrument to operate with Neutral Zone and SPH
Set Point.

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 11
SP
SPH
off off off
Temp.
time
r.d
r.Hd
offoff off
R.HC
= HC
ON ON ON
ONON
HE
ot
Pr1
Outputs
C3 Cooling with three automatic modes
The instrument still operates with Cooling action, but
this selection activates automatic switching between
the three modes: Normal, Eco and Turbo as already
described in the section on operating modes.
Temp.
SPE
SP
SPH r.Hd
r.Ed
i.tt (2) rtCr.tC
time
“Normal” “Turbo”“ECO”“Turbo”
i.Et (1)
r.d
Pr1 r.HC = C3
The time protections described in the next paragraph
(PP1/PP2/PP3) always work on the output configured
as ot.
In the event of a probe error, it is possible to set the
instrument so that the ot output continues working
in cycles according to the times programmed with
parameters r.t1 (activation time) and r.t2 (deactiva-
tion time). If a Pr1 probe error occurs, the instrument
continues activating ot output for r.t1 time then disa-
bling it for r.t2 time and so on until the error persists.
By programming r.t1 = oF the ot output in probe error
condition remains OFF. On the other hand, program-
ming r.t1 to any value and r.t2 = oF the ot output, in
probe error condition, remains always ON.
Remember that the operation of the temperature controller
can be conditioned by the following functions: Compressor
protection function and power-ON delay, Defrost, Open door
and External alarm with output disable from Digital Input.
5.7 Compressor protection function and
power-ON delay
All parameters concerning the compressor protection func-
tions can be found in the ]pr group.
The “Compressor Protection” function aims to avoid repeated
compressor start-ups controlled by the instrument in Cooling
applications or otherwise can be used to add a timed control
on the actuator control output.
This function foresees 3 time controls on the switching ON
of the output configured as ot associated to the temperature
control request. The protection consists in preventing the ot
output being switched ON during the times set with param-
eters P.P1, P.P2 and P.P3 and therefore that any activation
occurs only upon expiry of all protection times.
1. First control (parameter P.P1) foresees a delay to ot out-
put activation (switching-ON delay).
SP
Temp.
time
offoff off off
ON
ON
r.d
P.P1
P.P1
ot
ON
Pr1
Output
P.P1 P.P1
2. Second control (parameter P.P2) foresees an inhibition to
the activation of the output by a time delay that starts when
the output is turned OFF (delay after switching-OFF).
offoff off
ON
SP
time
r.d
P.P2
ON ON
Temp.
Pr1
P.P2 P.P2 P.P2
ot
Output
3. Third control (parameter P.P3) foresees an inhibition to the
activation of the output by a time delay that starts when
the output was turned ON last time (delay between two
switching-ON).
offoffoff
ON
SP time
r.d
P.P3 P.P3 P.P3
P.P3
ON ON
Temp.
Pr1
ot
Output
During the inhibition phases caused by the protections, the
LED that points out the control output activation (Cool or
Heat ) blinks.
It is also possible to prevent the activation of all the outputs
after the instrument is turned ON for the time set at param-
eter P.od (Power ON delay).
During the power ON delay phase, the display shows the
indication od alternated with the normal display.
These functions are disabled when all the relative param-
eters are set to oF (P.P1, P.P2, P.P3 and P.od = oF).
In case HOT-GAS defrost mode for centralized systems
(d.dt = HG), the parameters P.P1 and P.P2 are used to set
the Liquid solenoid valve activation delay and the Aspi-
ration solenoid valve deactivation delay (see “HOT-GAS
defrost operation for centralized systems”).
5.8 Defrost control
All parameters concerning the defrost control are contained
in the ]df group.
The defrost control acts on the outputs configured as ot, DF
and dH.
The type of defrost is set by the parameter d.dt:
EL With electrical heating (or by compressor stop):
during defrost, the ot output is disabled while the output
dF is enabled. If the dF output is not used, the defrost
will take place by compressor stop;
in With hot gas or Inversion of cycle:
during defrost both the outputs (ot and dF) are enabled;
no Without compressor output conditioning:
while defrosting, the ot output continues to operate in or-
der to control the temperature, also dF output is enabled.
Et With electrical heating and defrosting temperature
control: while defrosting, the ot output is disabled
while the output dF operates as evaporator tempera-

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 12
ture control. In this mode the defrost duration is by d.de
time-out. During defrost the dF output behaves as an
heating action temperature control with Set Point = d.tE,
the differential fixed to 1°C and refers to the temperature
measured by the evaporator probe (EP). In this mode,
if the evaporator probe is not enabled or in error, the de-
frost action behaves as with EL selection (therefore the
dF output during defrost must always remain activated).
HG With hot gas in centralized systems: with this mode it
is necessary to configure 3 outputs to control Liquid
solenoid valve (ot output), Hot gas solenoid valve
(dF output) and Suction solenoid valve (Au output with
configuration Fo = 3). During defrost, only the dF output
is activated, while before and after defrost the valves per-
form a sequence of timed operations described below.
5.8.1 Starting automatic defrosts
The automatic control of defrost occours:
–Defrost at defined times – “Real Time Clock Defrost” (when
peresent and enabled the RTC);
–By interval times (regular or dynamic);
–By Evaporator temperature;
–By continuous compressor running time.
In order to avoid unnecessary defrosts when the evapora-
tor temperature is high, the d.tS parameter allows to set the
temperature related to the evaporator probe (probe config-
ured as EP) under which defrosts are possible.
If the temperature measured by the EP probe is higher than
that at parameter d.tS the defrosts are inhibited.
Defrosting at defined times – “Real Time Clock Defrosts”
The choice d.dC = cL disables the defrost at specified inter-
vals (parameters d.di and d.Sd) and enables the Real Time
Clock Defrosts programmed through parameters c.01, c.02,
c.03, c.04, c.05, c.06, c.07, c.08, c.09, c.10, c.11, c.12, c.13
and, c.14. In this mode the instrument can therefore man-
age up to a maximum of 14 daily defrost events (14 x 7 = 98
weekly defrosts with d.8).
In any case, the events can be programmed as desired even
daily according to the following settings:
d. 1 = Monday ÷ d. 7 = Sunday;
d. 8 Every day;
d. 9 Monday, Tuesday, Wednesday, Thursday, Friday;
d.10
Monday, Tuesday, Wednesday, Thursday, Friday, Saturday;
d.11 Saturday and Sunday;
d.oF No day (event disabled).
These options allow to manage the start of defrosts at differ-
ent hours for weekdays and holidays according to user needs.
For further detailed information and programming examples,
see the “Programmable events” paragraph.
Note: Remember that for “Real Time Clock Defrosts” the
user must set d.dC = cL and the internal clock must be
present and enabled.
Defrost by regular interval time
As an alternative to programmable timed defrosts, the instru-
ment allows the execution of interval defrosts.
Through parameter d.dC it is possible to establish the count-
ing methods of the defrosting interval d.di:
rt Intervals with counting of the total functioning time. The
d.di interval is counted as the total time the instrument
is powered ON. This mode the one currently used in the
refrigerators systems;
ct Intervals with counting of the compressor function-
ing time (ot output switched ON). The d.di interval is
counted as the sum of the operating times of the control
output (ot output activated). This mode is typically used
in the positive temperature refrigerator systems with
defrost by compressor stop.
cS
Defrost at all compressor stops. The instrument carries
out a defrost cycle at each compressor stop (i.e. at each
deactivation of the ot output) or however at d.di defrost in-
terval end. If d.di = oF the defrost happens only when the
compressor stops. This mode is used only on particular
refrigerator systems in which the maximum evaporator effi-
ciency conditions at each compressor cycle are requested.
To enable the automatic defrost at intervals, after setting
d.dC parameter as desired (rt, ct or cS), with parameter d.di
select the time interval between the end of a defrost and the
beginning of the next.
The time that the instrument must wait to perform the first
defrost after power ON can be set with parameter d.Sd.
d.Sd allows to perform the first defrost to a different interval
from d.di time.
To force the instrument to perform a defrost cycle at each
power ON (as long as the conditions set with parameters d.tS
and d.tE are satisfied) set parameter d.Sd = oF.
This allows the evaporator to be permanently defrost, even
when frequent interruptions to power supply occur that may
cause the cancellation of the various defrosting cycles.
If instead it is desired that all the defrosts are performed at
the same interval time, set d.Sd = d.di.
Setting d.di = oF the Automatic defrost function by interval is
totally disabled (including the first, regardless to the time set
at the d.sd parameter).
Dynamic Defrost Intervals System
Note: For this function is necessary to use the evaporator probe.
Program d.dC = rt, ct or cS and set d.dd = any value to en-
able the Dynamic Defrost Intervals System mode.
If d.dd = 0the defrost intervals are those set and the Dynam-
ic Defrost Intervals System mode is disabled.
This mode allows to dynamically reduce the defrost interval
counting (d.di or d.Sd if is the first defrost), anticipating, when
necessary, the defrost execution, all based on an algorithm
that detects a drop in the refrigerator thermal exchange perfor-
mance. The dynamic defrost algorithm allows to highlight the
heat exchange reductions by evaluating the current tempera-
ture difference between the 2 probes (Pr1 and EP) and the
same difference stored in proximity of the control Set Point
temperature.
The advantage of the Dynamic Defrost Interval is the possi-
bility to program a defrost interval time longer than normal.
In this way, when necessary, the instrument has the possibil-
ity to anticipate/posticipate the defrost cycle from the pro-
grammed time.
If the system results correctly set, it is possible to avoid
many unnecessary defrost cycles (and therefore obtain a
consistent energy saving) that may occur with normal opera-
tion when, to ensure more system efficiency, the defrosts
interval is programmed with a time that is often too short.
With parameter d.dd - Defrost interval percentage reduc-
tion - is possible to establish the percentage of reduction of
the remaining time to start next defrost when the conditions
for the reduction happen.
If parameter d.dd = 100%, at first increasing (> 1°) of the
D T

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 13
between cell (Pr1) and evaporator (EP) probes from the D T
stored value, the instrument starts immediately a defrost.
To function correctly the instrument needs a
D T reference
value, but, as all variations (Active Set Point, r.d differential
or the execution of a defrost cycle) delete the D T reference
value, often no reduction can be made until a new reference
value has been acquired (at the end of the next defrost).
Phase
off off
ON
01 2 3
Temp.
d.di/d.Sd time to defrost Phases 0, 1
Defrost
off off
DT0
d.tE
d.tS
Cool
ot
Defrost
dF
SP + r.d
SP
Pr1
r.d
EP
1°
DT1 DT2 DT3
time to defrost Phase 2
time to defrost Phase 3
time
ON ON ON
E.g. “Dynamic defrost intervals system” with a reduction
d.dd = 40% and temperature defrost end.
Defrost by evaporator temperature
The instrument starts a defrost cycle when the evaporator
temperature (EP probe) falls below the d.tF programmed
temperature for d.St programmed time to ensure a defrost if
the evaporator reaches very low temperatures which, as a
rule, are symptomatic of a bad heat exchange compared to
normal operating conditions.
If d.tF = -99.9 the function is disable.
The function is operative both in the case of operation with
defrosts at fixed times (d.dC = cL) and in the case of opera-
tion with interval defrosts(d.dC = rt, ct, cS).
Defrost by continuous compressor running time
The instrument starts a defrost cycle when the compressor
is turned continuously ON for the time d.cd.
This function is used because the continuous compressor
operation for an extended period is usually symptomatic
of a bad thermal exchange typically caused by frost on the
evaporator.
If d.cd = oF the function is disabled.
The function is operative both in the case of operation with
defrosts at fixed times (d.dC = cL) and in the case of opera-
tion with interval defrosts(d.dC = rt, ct, cS).
5.8.2 Manual defrost
To manual start a defrost cycle, press the key /and keep it
pressed for about 5 s while the instrument is in normal mode.
After the key pressure, if the conditions are correct, the
LED lights up and the instrument performs a defrost cycle.
To stop a defrost cycle, press the key
/ and keep it
pressed for about 5 s during the defrost cycle execution.
5.8.3 Defrost ends
With 1 evaporator
The automatic defrost cycle can be ended by time or, if an
evaporator probe is used (Pr2 probe configurade as EP),
when the evaporator reaches a particular temperature.
If the evaporator probe is not used the duration cycle is set
by the parameter d.dE. Setting d.dE = 0interval or manual
defrosts are disabled
If instead the evaporator probe is used, the defrost cycle
ends when the temperature measured by the evaporator
probe (EP) exceeds the temperature set at parameter d.tE.
If d.tE temperature is not reached, the defrost cycle is inter-
rupted when the time set at the parameter d.dE has elapsed.
In order to avoid unnecessary defrosts when the evapora-
tor temperature is high, in d.dC = rt, ct, cS modes the d.tS
parameter allows to establish the temperature referred to the
evaporator probe below which defrosts are possible.
If the temperature measured by the dvaporator probe is
higher than the temperature set at parameter d.tS and also t
parameter d.tE defrosts are inhibited.
d.tE
d.ts
Defrost
dF
offoffoffON ON
AB
Temp.
time
C
(NO defrost)
d.de
d.di/d.St (Defrost) d.di d.di d.di
(Defrost)
EP
E.g.: Defrost Aends due to reaching of temperature d.tE,
defrost Bends at the end of the d.dE time as the tem-
perature d.tE is not reached, defrost Cdoes not take
place as the temperature is higher than d.tS.
d.tE
d.ts
offoffoff off
d.di/d.Sd
ON ON ON
time
d.di
(Defrost)
d.de
1°
Defrost
dF
Temp.
EP
E.g.: Electric defrost with evaporator temperature control:
The defrost ends after the d.dE programmed time.
During defrost the dF output switches ON/OFF in
heating mode with 1° differential (Hysteresis) in order
to maintain the defrost temperature at d.tE Set Point.
With 2 evaporators
The instrument can also be used to control defrosts in twin
evaporators systems (or with a single evaporator, but large
enough to require two defrost control areas) by means of two
defrost outputs and two probe inputs for the two evaporators.
Defrosts are always launched simultaneously for both evapo-
rators and therefore the output configured as 2d is always
activated simultaneously with the output configured as dF.
TEP
Evaporator 1
Evaporator 2
T2P
dF
2d
E.g.: Schematic example of plant with two evaporators, 2
probes and electric defrosters.
If the two evaporator probes are not used, the defrost end,
intended as deactivation of the defrost outputs, happens
separately at the end of the times defined at parameters d.dE
(for output dF which controls evaporator 1 defroster) and
d.d2 (for output 2d which controls evaporator 2 defroster).
However, the end of a defrost as a controller phase always
occurs when both times have elapsed.

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 14
If each evaporator is equipped with its own probe, an input
as evaporator probe 1 (i.P o = EP) and an input as evapora-
tor probe 2 (i.P o = 2E) must be configured.
In this case the instrument controls the defrosts using the
following criteria:
–Defrost is enabled when at least one of the two temperature
readings is below the temperature set at parameter d.tS;
–Defrost by temperature starts when at least one of the two
T emperature readings remains below the temperature set
at parameter d.tF for time d.St;
–Defrost end, in the sense of deactivation of the defroster
command outputs dF and 2d in modes d.dt = EL, in and
no occurs separately for the two evaporators when their
respective temperatures sensed by the probes rise above
the values set at parameter d.tE (evaporator 1 with probe
EP) and d.t2 (evaporator 2 with probe 2E). If these tem-
peratures are not reached within the times set at param-
eters d.dE and d.d2 their respective defrosting actions are
interrupted. However, the end of defrost, as a controller
phase, occurs when both readings exceed the intended
values (or, if the temperatures are not reached, when their
maximum durations have reached).
If the selected defrost mode is of the type employing electric
heating and thermostating (d.dt = Et), the two defrost out-
puts dF e 2d behave as temperature controllers with heating
function with the their own Set Point: d.tE (evaporator 1) and
d.t2 (evaporator 2), both with hysteresis fixed at 1°C and
with reference to the respective temperatures measured on
the two evaporators.
If one of the two evaporator probes is not enabled or is in
error, its defrost behaves as with selection EL (during defrost
the defrost output remains always active).
Note: The “Dynamic Defrost” function and the thermostat-
ting function of the fans, always and only operate as
a function of the probe configured as EP (evaporator
1). If the control with the twin evaporator is not used,
it is recommended to set d.d2 = oF in order to avoid
unwanted influences on total defrost duration.
The defrost cycle in progress is shown on the instrument
with the lighting up of the LED.
In order to allow evaporator dripping, at the end of the de-
frost is possible to delay the compressor (ot output) restart
of the time set with parameter d.td. During this delay the
LED flashes to indicate the dripping in progress.
5.8.4 Defrosts in event of evaporator probe error
In event of evaporator probe error the defrosts occur at inter-
vals d.Ei with duration d.EE.
In the event that a probe error occurs, when the time left to
start or end of the defrost normally counted is less than that
set for the parameters related to the probe error conditions,
the defrost start or end occurs with the shortest time.
These functions are provided because, when the evapora-
tor probe is used, the defrost duration is usually set longer
than necessary (the time d.dE is a security time-out) and, in
the case the “Dynamic Intervals Defrost System” is used,
the interval is usually set longer than what is normally pro-
grammed into instruments that do not have these functions.
Note: In case of plants with double evaporator, the defrost
duration switching function acts only on parameter
d.dE relative to evaporator 1(d.d2 remains at the same
value even if the probe configured as 2P is in error).
5.8.5 Defrost display lock
Through parameters d.dL and A.dA it is possible to define the
display behaviour during defrost.
The d.dL parameter can assume the following values:
on Locks the display on the last Pr1 probe temperature
readedfor all the defrost cycle and until, after defrost
end, the Pr1 temperature has not reached the lock
value or the value [SP + r.d] or is elapsed the time
setted on parameter A.dA.
Lb Shows the label dEF during the defrost cycle and of
PdF after the defrost, until, at defrost end, the Pr1
temperature has not reached the lock value or the
value [SP + r.d] or is elapsed the time setted on pa-
rameter A.dA.
oF The display continues showing the temperature meas-
ured by Pr1 probe during the defrost cycle.
5.8.6 Pre- and post-defrost output
The configuration of the dH output (which can be used as a
control of a drainage resistance that can be enabled before,
during and after defrost) and the setting of the times d.dP
and d.Pd allow to have an output signal before defrost and
after the end of the defrost.
The pre-defrost and post-defrost output activation times are
programmable with parameters d.dP and d.Pd.
The operation consists in deactivating the ot control output
and activating the dH output when the defrost starts.
Then keep deactivated (if the defrost is electric) or reactivate
(if the defrost is with hot gas/cycle inversion) the ot control
output and activate the defrost output dF after the d.dP time.
Then deactivate the defrost output dF and the control output
ot when d.dE time has elapsed.
In the end keep the control output ot deactivated for the d.td
time (dripping time) and deactivate the dH output when d.Pd
time has elapsed.
offoff ON
off
dind.Pd
of
fo
ff
d.dP
ON/OFF #1 ON
dtd
Defrost
dF
dH
Compr.
ot
ON
d.de
Start defrost End defrost
#1: ON if ddt = in;
OFF if
ddt
= EL
5.8.7 Hot-gas defrost in centralized systems
The described operation is enabled setting d.dt = HG.
When using this defrost mode it is necessary to configure 3
outputs to control:
–The Liquid Solenoid Valve (output ot);
–The Hot Gas Solenoid Valve (dF output);
–The Suction Solenoid Valve (Au output with o.Fo = 3con-
figuration).
In this configuration, during defrost only the dF output is ac-
tive, while before and after defrosting, the valves ot and Au
perform a sequence of timed operations described below.
As in all Hot Gas defrosts, also these systems use the heat
of the compressor exhaust gas to perform the defrost.
However, given the construction of these systems in which
all the evaporators are mounted in parallel and the compres-
sors, being centralized, are not controlled by the instrument
(to adjust the temperature the instrument controls the Liquid

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 15
solenoid valve) it is necessary to use an output that controls
an Aspiration solenoid valve so that the evaporator that per-
forms the defrost is isolated from the system.
Similarly while defrosting, the Liquid solenoid valve (the
same used to control the temperature) must also be closed
to isolate the evaporator.
Evaporator n
Liquid
(ot)Fan (Fn)
Hot Gas (dF)
Suction (Au)
Suction (Au)
Evaporator 2
Liquid
(ot)Fan (Fn)
Hot Gas (dF)
Suction (Au)
Evaporator 1
Liquid
(ot)Fan (Fn)
Hot Gas (dF)
Suction line
Hot Gas line
Liquid line
Compressor Rack Unit
Note: For greater clarity in the diagram, some details con-
cerning the hydraulic circuit have been deliberately
omitted (non-return valves etc.) because they are not
controlled by the instrument but are still necessary for
the correct system operation.
To avoid sudden pressure changes in the plant, the defrost
phases are performed respecting a precise sequence de-
scribed below.
r.d
Liquid
(ot)
SP
Temp.
time
P.P1
Pr1
Suction
(Au o.fo=3)
off
off
The system configured for the Hot Gas defrost in central-
ized plants behaves as follows:
–At start-up, the Suction solenoid valve is activated imme-
diately (respecting, if set, the P.od delay), after which, if
there is a cooling request, also the Liquid solenoid valve is
activated (respecting the P.P1 delay).
–During the control phase, the Suction solenoid valve is
therefore always activated while the Liquid valve is acti-
vated as a function of the temperature control.
A) When defrost occurs, first of all Liquid valve (ot
output)is immediately disabled (if active);
B) Then, after the delay set at parameter P.P2 the
instrument also deactivates:
• the Suction valve (output Au configured as o.Fo = 3)
and, if parameter F.FE = oF,
• the Fans output (Fn output).
Note: During this period of time, the fans operation and
maintaining the suction valve open are necessary
to facilitate the complete evaporation of the fluid
contained in the evaporator.
If the defrost request occurs when the Liquid valve
outlet is already closed and the time P.P2 has
elapsed (which counting always starts when the ot
output is turned OFF) the deactivation of the Suction
valve and eventually of the fans is immediate.
Otherwise, the defrost request happens during
the P.P2 time count, the Suction valve and the fans
deactivation occurs at the when P.P2 counting
expires. At this point the Hot Gas valve is activated
(dF output) and the defrost begins;
C)
At defrost end (always handled by the d.dE time or
by the evaporator temperature d.tE or by the manual
control), the output dF is disabled and the delay
times d.td (dripping time) and F.Fd are activated
(fans delay after defrost);
D) When d.td time counting has elapsed, the output of
the Suction solenoid valve is reactivated, as when
the instrument is switched ON;
E) In the event that, as often happens, the temperature
controller should request it, after the P.P1 time the
Liquid valve will be activated and the instrument
returns to the normal temperature control mode;
FWhen F.Fd time counting has elapsed, fans are re-
activated if the evaporator temperature is lower than
the one set at parameter F.FL;
Fan
(Fn)
F.Fd
d.tdP.P2
Suction
(Au, o.fo=3)
off
Liquid
(ot) off
Defrost
(dF) offoff
off
AB CDEF
d.dE
P.P1
Example of Hot Gas defrost for centralized systems with
defrost start when the Liquid valve is open.
Fan
(Fn)
Suction
(Au, o.fo=3)
off
Liquid
(ot) off
Defrost
(dF) offoff
off
BCDEF
P.P1
d.tdP.P2
F.Fd
d.dE
Example of Hot Gas defrost for centralized systems with de-
frost start when the Liquid valve is closed after the P.P2 time
counting has expired.
5.9 Evaporator fans control
All parameters concerning evaporator fans control are con-
tained in the group ]Fn.
The fans control operates on the output configured as Fn
depending on certain instrument control statuses and the
temperature measured by the EP evaporator probe.
In the case that EP evaporator probe is not used or in error ,
the output Fn is activated only depending on the parameters
F.tn, F.tF and F.FE.
Parameters F.tn and F.tF decides the fans functioning when
the output configured as ot (compressor) is OFF.
When output ot is OFF , it is possible to set the instrument
so that that the Fn output continues working in cycles ac-
cording to the times programmed at the parameters F.tn (fan
activation time) and F.tF (fan deactivation time).
When ot output is switched OFF, the instrument activates the

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 16
Fn output for the time F.tn, then deactivates it for the time
F.tF and so on whilst ot output remains OFF.
Setting F.tn = oF the Fn output will be disabled when the
ot output is switched OFF (evaporator fans OFF when the
compressor is OFF or fans run on compressor).
Programming instead F.tn to any value and F.tF = oF the
output Fn will remain switched ON even when output ot is in
OFF condition (evaporator fas ON with compressor OFF).
Temp.
time
F.tn F.tF F.tn F.tF
PR1
SP
ot
Output
Fn
Output
off off
ON ON ON
off
ON ON
r.d
The parameter F.FE instead decides whether the fans must
always be switched ON independently of the defrost status
(F.FE = on) or switched OFF during defrost (F.FE = oF); in
this later case, it is possible to delay the fans re-start even
after the end of the defrost by the time set at parameter F.Fd.
When this delay is active the
LED flashes to signal the
delay in progress.
When the evaporator probe is used the fans, as well as be-
ing conditioned by the parameters F.tn, F.tn and F.FE, are
also conditioned by a temperature control.
F.LF
Ep
F.FL
Temp.
F.dF
F.dF
time
offoff off
ON
Fn
Output
ON
In fact it is possible disable the fans when the temperature
measured by EP evaporator probe is higher than the one set
at parameter F.FL (temperature too hot) or lower than the
one set at parameter F.LF (temperature too cold).
The relative differential that can be set at parameter F.dF is
also associated with these parameters.
Remember that the fans functioning can be conditioned by
the “Door open” function controlled by digital input.
Note: Particular attention should be paid to the proper use of
temperature-based fans control functions, as in a typi-
cal refrigeration application, the evaporator fan stop
blocks the heat exchange.
5.10 Alarm functions
All parameters concerning the Alarm functions are contained
in the group ]Al.
The alarm conditions of the instrument are:
–Probe errors: E1, -E1, E2, -E2, E3, -E3, E4, -E4;
–Temperature alarms: H1, L1, H2, L2;
–External alarm: AL, PrA, HP, LP;
–Open door alarm: oP;
The alarm functions act on LED
, on the internal buzzer
(when present and configured with parameter o.bu) and on
the output selected with parameters o.o1, o.o2, o.o3 and o.o4
according to the parameters set.
Alarm conditions are pointed out lighting up the LED, while
the acknowledged alarm is indicated by the flashing of LED.
The buzzer (when present) can be programmed to be
activated when an alarm occurs (o.bu = 1or 3) and can be
disabled (alarm silencing) manually by pressing any of the
instrument keys.
Also outputs can signal alarms; possible selections of output
parameters for the alarm signalling function are:
At
The output is to be activated in alarm condition and can be
disabled manually by pressing any of the instrument keys
(typical application for an acoustic signal);
AL The output is to be activated in alarm condition but cannot
be manually disabled; it is then disabled only when the
alarm status ceases (typical application for a light signal);
an The output is to be activated in alarm condition and must
remain active even when the alarm status has ceased
(latched alarm). The disabling action (recognition of
a latched alarm) can only be carried out manually by
pressing any key when the alarm status has removed.
-t Function similar to At but with inverse logic function
(output active in normal conditions, disabled in alarm).
-L Function similar to AL but with inverse logic function
(output active in normal conditions, disabled in alarm).
-n Function is similar to An but with inverse logic function
(output active in normal conditions, disabled in alarm).
5.10.1 Temperature alarms
The instrument has 2 temperature alarms, fully configurable
with a maximum and a minimum threshold.
The temperature alarms work according to the probe measure-
ments set at parameters A.y1 and A.y2, the alarm thresholds
set with parameters A.H1 and A.H2(max. alarms) and A.L1 and
A.l2 (min. alarms) and the relative differentials A.d2 and A.d2.
Using parameters A.y1 and A.y2 it is also possible to define
whether the alarm thresholds A.H1 , A.H2 , A.l1 , A.l2 are abso-
lute or relative to the set point.
Depending on the desired alarm operating mode, parameter
A.y1 and A.y2 can be set as:
1
Absolute alarms referred to Pr1 with label (H-L) display;
2 Relative alarms referred to Pr1 with label (H-L) display ;
3 Absolute alarms referred to Au with label (H-L) display ;
4 Relative alarms referred to Au with label (H-L) display ;
5 Absolute alarms referred to cd with label (H-L) display;
6 Absolute alarms referred to Pr1, no label displayed;
7 Relative alarms referred to Pr1, no label displayed;
8 Absolute alarms referred to Au, no label displayed;
9 Relative alarms referred to Au, no label displayed;
10 Absolute alarms referred to cd, no label displayed;
11
Absolute alarms referred to EP with label (H-L) display;
12 Absolute alarms referred to EP , no label displayed.
Using some parameters it is also possible to delay the enabling
and the intervention of these alarms. These parameters are:
A.P1, A.P2 Temperature alarm intervention delay at instrument
power ON when the instrument is in alarm status
at power ON. If the instrument is not in alarm sta-
tus at power ON, A.P1 and A.P2 are not considered.
A.da This is the time period during which temperature
alarms 1 are disabled at the end of a defrost cycle.
Note: During defrosts and after defrosts for the time set with
A.dA, alarm 1 is disabled, whereas during defrosts
alarm 2 is always enabled.

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 17
A.t1, A.t2 Activation delay times for temperature alarms 1 and 2.
Temperature alarms 1 and 2 are enabled at the end of the
alarm-disabling time periods and activated after time periods
A.t1 and A.t2 when the temperature measured by the probe
configured for the alarm rises above or drops below the
respective maximum and minimum alarm thresholds.
Through parameters A.A1 and A.A2 it is also possible to set
the alarms action on control and on alarm outputs (buzzer
included).
This means that, for example, is possible to intervene on the
control output directly, by deactivating it in the case there are
temperature alarms also on the probes configured as Au (e.g.
antifreeze function) or as CD (e.g. dirty condenser function).
Configuring both alarms with reference to the same probe,
the instrument also allows to manage pre-alarm signals (for
example that do not activate the alarm output and/or the
buzzer) and alarm (which instead activate the alarm output
and/or the buzzer).
If the alarms are Absolute alarms (A.
oo = 1, 3, 5, 7, 9, 10),
the alarm thresholds are the same as those set at param-
eters A.H o and A.L o .
AL
A.L1
A.H1
Temp.
A.d1
A.d1
time
offoff off
ON ON
H1 L1
If the alarms are Relative alarms (A. oo = 2, 4, 6, 8), the
alarm thresholds are: [SP + A.H o ] and [SP + A.L o ].
AL
A.L1
SP
A.H1
Temp.
A.d1
A.d1
time
offoff off
ON ON
H1 L2
The maximum and minimum temperature alarms can be disa-
bled by setting the related parameters A.H o and A.L o = oF.
Triggering of the temperature alarms causes the LED to
light up, activates outputs configured with the set alarm func-
tion, and activates the internal buzzer if configured.
5.10.2 External alarms (digital inputs)
The instrument can notify alarms external to the instrument when
one or more digital inputs configured as i.oF= 4, 5, 12, 13, 14
are activated.
Simultaneously to the configured alarm signal (buzzer and/or
output), the instrument points out the alarm by lighting up the
LED and displaying the label of the alarm detected (AL,
PrA, HP, LP) alternated to the variable set at parameter i.dS.
The i.oF= 4mode produces no action on the control outputs
whereas the other modes deactivate the ot output or deacti-
vate all control outputs at digital input intervention.
Alarm ot output
(compressor)
Other control outputs
(Fn, dF, Au, HE)
AL (4) Unchanged
AL (5) OFF
PrA, HP, LP OFF Unchanged
5.10.3 Open door alarm
The instrument can point out an Open door alarm activated
by the digital input with the function programmed as:
i.oF= 1, 2or 3.
When the digital input is activated the instrument shows oP
alternated to the variable set at parameter i.dS. Elapsed the
delay programmed at parameter A.oA, the instrument signals
the alarm activating the configured alarm output (buzzer/ouput),
lighting up the LED while continues displaying the label oP.
At the intervention of the open door alarm the inhibited output
are immediately reactivated (fans or fans + compressor).
5.11 HACCP function (alarm recording)
The parameters associated with displaying HACCP alarms
are contained in the ] HA group, while those associated with
the configuration are contained in the ] Al group.
The HACCP (Hazard Analysis and Critical Control Points)
function causes the instrument to record the last 10 alarms
that have occurred together with those information useful for
determining the criticality of the alarm.
The function is available only for those instruments equipped
with the calendar clock.
The following HACCP alarms can be stored in memory:
Alarm code HACCP Alarm
H1 Maximum temperature alarm H1
L1 Minimum temperature alarm L1
H2 Maximum temperature alarm H2
L2 Minimum temperature alarm L2
bo Power failure (black-out) alarm
AL Alarm from digital input
HACCP alarms are stored if the correspondent enabling
parameters are configured and the preset time configured at
the same parameter has elapsed.
Furthermore, alarm recording can also be disabled through
a configured digital input (i.
o F= 13) or through the or
keys, if appropriatrely configured (t.UF o t.Fb = 7).
To view these alarms, use the procedure for viewing the pro-
gramming parameters to access the H.01 ÷ H.10 parameters
contained in the
] HA group.
Note: For details, please see: “2.9 Displaying haccp alarms
(models with RTC)” a pagina 5.
The instrument automatically sorts these parameters from
most recent (H.01) to oldest (H.10) whenever an alarm is
recorded or deleted.
If more than 10 alarms occur, the instrument deletes the
information about the oldest alarm by overwriting it with the
one of most recent alarm.
When this occurs the instrument increments by one the
value of the H.dL parameter by which it is possible to display
the number of alarms the instrument has been forced to
delete when these exceeded the permitted memory.
After selecting the parameter for the alarm which the user wish-
es to display, if the label flashes this indicates that the alarm has
never been displayed (therefore not recognized/acknowledged).
To recognise it, simply access the parameter pressing the
key and display it.
The next time it is displayed, the parameter label will be shown
solid (not flashing).
If the alarm is still active at the time it is displayed, the data are
shown but the alarm is not recognized and cannot be cancelled.
In the event of unrecognized (and therefore still ongoing)

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 18
HACCP alarms, the instrument displays the message HAC
alternated with the Normal display.
Within the parameter the data will be displayed sequentially
as the
key is repeatedly pressed.
The alarm can be deleted by holding down the key for more
than 5 s while one of the data of the alarm is displayed. Its de-
letion is confirmed by the display indicating “---” for approx. 1 s.
Similarly the value of the H.dL parameter can be reset by
holding down the key for more than 5 seconds while its
value is displayed.
However, if desired, all alarms can be deleted immediately by:
–Holding down the key for 5 s if parameter t.UF = 6;
–Holding down the
key for 5 s if parameter t.Fb = 6;
–By a digital input if the relevant parameter i.
o F= 11.
–By the “Reset all parameter function” (at r.P password
prompt answer -48).
5.11.1 HACCP temperature alarms
Setting parameters A.r1 (for alarms H1 and L1) and Ar.2
(for alarms H2 and L2) it is possible to enable recording of
temperature alarms as HACCP alarms.
The same parameters can also be used to define the mini-
mum alarm duration that will cause the alarm to be recorded
as an HACCP alarm.
If the alarm duration is shorter than the programmed time,
the alarm is not recorded.
Setting A.r
o = oF, recording is disabled.
For each recorded temperature alarm, the following data are
stored:
–Alarm type (A. = H1 or L1 or H2 or L2);
–HACCP alarm start time
(y. = year, M. = month, d. =day, h..= hour, n. = minute);
–HACCP alarm duration (E. = hours, e. = minutes);
–Critical temperature reached (max. peak if Hi alarm or min.
peak if Lo alarm).
AL
A.H1
Max.
temp
.
Temp.
A.d1
time
H1
A.r1 E.e. time
12 3
Example of HACCP maximum temperature alarm H1
1. Configured alarm start (in this case with A.t1 = oF);
2. HACCP alarm recording start;
3. Alarm end.
Note: If there is a power failure during a temperature alarm,
the instrument records the duration of the alarm up
until the moment the power failure began.
In order to capture correct information on the temperature
conditions which the user wishes to monitor, it is recom-
mended to set a black-out alarm and if necessary disable
the on-startup alarm delays (A.P
o ) so that if the alarm is still
active when the power returns it is recorded as a new alarm
at the end of the power failure.
5.11.2 HACCP power failure alarms (black-out)
This type of alarm is recorded only if the power failure ex-
ceeds the value set at parameter A.bo.
If A.bo = oF the black-out alarm is never recorded.
For each black-out alarm, the following data are recorded:
–Alarm type (A. = bo);
–Start time
(y. = year, M. = month, d. =day, h..= hour, n. = minute);
–Black-out duration (E. = hours, e. = minutes);
–The temperature of alarm 1 probe (see parameter A.y1)
measured at black-out end (if available; if not available the
display shows “---”).
T
emp.
at end of
Blac
k-out
Temp.
time
BLACK-OUT
A.bo
E.e. time
1
2
3
Example of HACCP black-out alarm
1. Power failure;
2. Min. power failure duration that will enable HACCP black-
out alarm recording;
3. Return of power supply (alarm end).
5.11.3 HACCP alarms from digital input
HACCP alarms from digital input are recorded only if the ge-
neric alarm (AL) from a digital input is configured in modes
4or 5and remains for a time longer than the time set in
parameter A.di.
If A.di = oF, an alarm from a digital input is never recorded.
For each alarm from a digital input recorded, the following
data are stored:
–Alarm type (A. = AL);
–Start time
(y. = year, M. = month, d. =day, h..= hour, n. = minute);
–Alarm duration (E. = hours, e. = minutes);
–The temperature of alarm 1 probe (see parameter A.y1)
measured at alarm end (if available, if not available the
display shows “---”).
Digital
alar
m
T
emp.
at alar
m
end
Temp.
time
offoff ON
A.di E.e. time
12 3
Note: If the power fails during an alarm from a digital input,
the instrument records the duration of the alarm up
until the moment the power failure began.
5.12 Functioning of keys and /Aux
All the parameters concerning keyboard functions are con-
tained in the group ] tS.
Two of the instrument keys, in addition to their normal func-
tions, can be configured to operate other commands.
The key function can be defined by the parameter t.UF while
the key function can be defined by the parameter t.Fb.
Both the parameters have the same possibilities and can be
configured for the following functions:
oF The key carries out no function;
1 Pressing the key for at least 1 s, it is possible to enable/
disable the auxiliary output if configured (o.Fo = 2).
If are programmed activation/deactivation events of the
auxiliary output by Real Time Clock the action of the
keys force output status until the next event;

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 19
2 Pressing the key for at least 1 s, it is possible to toggle
between Eco and Normal mode (SP, SPE). Once the
selection has been made, the display shows the active
Set Point code (SP, Eco) for about 1 s. If are pro-
grammed mode changes events by Real Time Clock the
action of the keys force status until the next event.
3 Pressing the key for at least 1 s, it is possible to switch
the instrument from ON to Stand-by status and vice-ver-
sa. If switch-ON/Stand-by events are programmed using
the RTC, the key action has priority on the event.
4Pressing the key for at least 1 s activates/deactivates a
Turbo cycle.
5Forces a programmed Switch-ON/Switch-OFF (Stand-
by) event - Pressing the key for at least 1 s switches the
instrument from the ON state to the Stand-by state and
vice-versa, until the next event. Therefore, if switch-ON/
Stand-by events are programmed using the RTC, the key
action has priority on the event.
6HACCP Alarm Reset - Pressing the key for at least 1 s
resets stored HACCP alarms. The display confirms the
reset showing “---” for about 1 s.
7
HACCP Alarm Recording Disabled - Pressing the key for at
least 1 s disables/enables recording of the HACCP alarms.
After the selection is made the display shows for about 1 s:
Hon (HACCP alarms enabled) or
Hof (HACCP alarms disabled).
5.13 Clock programmable events
Programmable events are set using the 14 parameters
(c.01... c.14) contained in the ] cE group.
After selecting the desired parameter, press the
key re-
peatedly to cycle through the following:
h..
oo Hours (e.g. h.13);
n..
oo Minutes (e.g. n.45);
d..
o Day of the week (e.g. d.1);
t.
o Type of event to be performed at the programmed time
(e.g. t.1).
Note: See “2.8 Scheduling events at defined times (models
with RTC)” a pagina 4 for details.
The days are numbered as follows:
d. 1 Monday ÷ d. 7 Sunday;
d. 8 Every day;
d. 9 Monday, Tuesday, Wednesday, Thursday, Friday;
d.10
Monday, Tuesday, Wednesday, Thursday, Friday, Saturday;
d.11 Saturday and Sunday;
d.oF No day (event disabled).
The 14 event-programming parameters allow a maximum of
14 x 7 = 98 weekly events to be scheduled (using d. 8).
The following events can be programmed:
t.1 Switch instrument ON;
t.2 Put instrument in Stand-by;
t.3 Switch Auxiliary output ON;
t.4 Switch Auxiliary output OFF;
t.5 Start defrost (to enable scheduled defrosts, program
also d.dC = cL);
t.6 Switch to Eco mode (SPE);
t.7 Switch to Normal mode (SP).
A manual intervention, e.g. to change the mode (Eco or Nor-
mal) or activate/deactivate the auxiliary output, is effective
only until the next scheduled event.
For example, if the instrument is in Eco mode and is forced
manually to Normal mode it will stay in Normal mode until
the next event that switches it to Eco mode.
Programming example
The user wishes to set the following events:
–4 daily defrosts weekdays at 7:00, 12:00, 17:00 and 22:00;
–2 defrosts every Sunday at 7.00 and 19.00
(also set d.dC = cL);
–1 daily weekday switching from Normal to Eco mode at
20.00 and 1 switching from Eco to Normal mode at 6.00;
–No switches on Sundays;
–1 daily weekday switching Aux output ON at 8.00 and
1 daily switching the Aux output to OFF at 21.00;
–No switches on Sundays.
Event Parameter Hour Minutes Days Event
Work day defrost 1 c.01 h.07 n.00 d.10 t.5
Work day defrost 2 c.02 h.12 n.00 d.10 t.5
Work day defrost 3 c.03 h.17 n.00 d.10 t.5
Work day defrost 4 c.04 h.22 n.00 d.10 t.5
Sunday defrost 1 c.05 h.07 n.00 d.7 t.5
Sunday defrost 2 c.06 h.19 n.00 d.7 t.5
ECO mode c.07 h.20 n.00 d.10 t.6
Nomal mode c.08 h.06 n.00 d.10 t.7
Aux on c.09 h.08 n.00 d.10 t.3
Aux off c.10 h.21 n.00 d.10 t.4
c.11...... c.14 h.00 n.00 d.oF t.oF
5.14 RS485 Serial Interface
The instrument can be equipped with a RS485 serial com-
munications interface, by means of which it is possible to
connect the controller to a network to which other instru-
ments (PLC controllers) are connected, all depending typi-
cally on a personal computer used as plant supervisor.
Using a Personal Computer it is possible to acquire all
the function information and to program all the instrument
configuration parameters. The software protocol adopted fa
MODBUS RTU type, widely used in several PLC and super-
vision programs available on the market (X35 series protocol
manual is available on request).
The instrument has two terminals called D+ and D- that must
be connected to all network terminals with the same label.
For wiring the line, it is advisable to adopt a 3-pole wired and
shielded cable connected as shown.
D+
D-
GND
Host
(OP/PC/PLC)
RS485
Interface
shield
14
Rt
120Ω
15 16
D+ GNDD-
X34 no. 1
14 15 16
D+ GNDD-
X34 no. 2
14 15 16
D+ GNDD-
X34 no. 31
The interface circuit allows the connection of up to 32 instru-
ments on the same line.
To maintain the line in rest conditions a 120
W resistance (Rt)
must be connected to the end of the line.
If the instrument is equipped with a serial interface, the pa-
rameters to be programmed are those present at parameters
group ]tS:
t.AS Address of the station. Set a different number for
each station, from 1 to 255.
t.br Serial interface baud rate. Settings available:
1 = 9600 baud, 2 - 19200 baud, 3 - 38400 baud.

Ascon Tecnologic - X35- - OPERATING INSTRUCTIONS - PAG. 20
6. ACCESSORIES
The instrument is equipped with a connector that allows the
connection to some accessories.
6.1 Parameters configuration by “A01”
The instrument is equipped with a 5 poles connector that
allows the transfer from and toward the instrument of the
functioning parameters through the device A01.
This device it is mainly usable for serial programming those
instruments that need the same parameters configuration or
to keep a copy of the parameters setting of an instrument and
allow its fast duplication.
The same device allows to connect a PC via USB with which,
through the appropriate configuration software for “AT Univer-
salConf tools”, the operating parameters can be configured.
To use the A01 device it is necessary that the device or instru-
ment are being correctly supplied.
AC supply
Supply adapter
12 VDC
Power
supply
Enter
PWS 12 V
A B C TTL
+-
USB to PC
US
B
Enter
PWS 12 V
A B C TTL
+-
USB to PC
US
B
For additional info, please look at the A01 instruction manual.
6.2 Parameters configuration using an NFC
Device
The AFC1 is a contactless NFC (Near Field Communica-
tions) connection device that allows to Upload/Daownload
the operating parameters From/To the instruments. The
AFC1 is powered directly by the USB port through which is
connected to a PC.
When an instrument is equipped with the NFC communication
option, its operating parameters can be set through a common
Personal Computer, the “AT UniversalConfig” program and
the AFC1 device or directly from a smartphone equipped
with the NFC interface and the appropriate “AT Conf” App.
Once the changes have been made, the parameters can be
sent to the instrument using the NFC communications.
To load the operating parameters in the instrument using the
AFC1 device, place the instrument on the AFC1 with the dis-
play of the controller facing the NFC symbol ) on the NFC1
device, then send the parameters to the instrument memory.
USB
USB
AFC1
NFC
To load the program in the instrument using a Smart-
phone, place the NFC antenna of the Smartphone facing the
display of the controller, then, using the commands of the “AT
Conf” App download the parameter data (consult the Smart-
phone manual for details about the NFC antenna position).
6.3 TVR Y remote display
To the instrument it is possible to connect the remote display
TVR Y through a special cable that can have a maximum
length of 10 m. The device TVR Y, directly supplied by the
instrument, allows to show the temperature measured by the
probe Pr1 through a 2½ digit display.
Power supply
TVR Y (--)
Cable 10 m max.
For additional info, please look at the TVR Y instruction manual.