Ascon tecnologic X34 User manual

Ascon Tecnologic - X34 - OPERATING INSTRUCTIONS - PAG. 1

X34-X34S

DIGITAL ELECTRONIC

REFRIGERATION UNITS

CONTROLLER

OPERATING INSTRUCTIONS

18/05 - cod.: ISTR_M_X34_E_05_--

ASCON TECNOLOGIC S.r.l.

Viale Indipendenza 56, 27029 - VIGEVANO (PV) ITALY

Tel.: +39 0381 69871 - Fax: +39 0381 698730

http:\\www.ascontecnologic.com

[email protected]

PREFACE

m This 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.

m Whenever 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 ............................................................... 3

2.1 Fast Set Point programming.............................................. 3

2.2 Standard mode parameters programming ........................ 3

2.3 Parameter Protection Using The 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 .................................. 5

2.9 Displaying HACCP alarms ................................................ 5

3. Usage Warnings .......................................................... 6

3.1 Admitted usage................................................................. 6

4. Installation warnings................................................... 6

4.1 Mechanical mounting........................................................ 6

4.1.1 Mechanical dimensions [mm] ............................................... 6

4.1.2 Panel cut-out......................................................................... 6

4.1.3 Mounting............................................................................... 6

4.2 Electrical connections ....................................................... 7

4.2.1 Electrical wiring diagram....................................................... 7

5. Functions ..................................................................... 7

5.1 ON/Stand-by function........................................................ 7

5.2 Normal, “Eco” and Turbo operating modes ....................... 7

5.4 Digital Inputs ..................................................................... 9

5.5 Outputs and buzzer conﬁguration ................................... 10

5.6 Temperature control ........................................................ 10

5.7 Compressor protection function and power-ON delay .... 11

5.8 Defrost control................................................................. 12

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 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.............................................. 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 Intefarce.................................................... 19

6. Accessories ............................................................... 20

6.1 Parameters conﬁguration by “A01”.................................. 20

6.2 TVR Y remote display ..................................................... 20

7. Programmable parameters table.............................. 21

8. Problems and maintenance...................................... 26

8.1 Notiﬁcations .................................................................... 26

8.1.1 Error messages .................................................................. 26

8.1.2 Other messages ................................................................. 26

8.2 Cleaning.......................................................................... 26

8.3 Disposal .......................................................................... 26

9. Warranty and Repairs ............................................... 26

10. Technical data............................................................ 26

10.1 Electrical characteristics ................................................. 26

10.2 Mechanical characteristics.............................................. 27

10.3 Functional features ......................................................... 27

11. How to order .............................................................. 27

Ascon Tecnologic - X34 - OPERATING INSTRUCTIONS - PAG. 2

1. INSTRUMENT DESCRIPTION

1.1 General description

The X34 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 intervals,

by arrival at temperature or by length of time of continuous

compressor operation through stopping the compressor,

electric heating or hot gas/cycle inversion; moreover, it can

also be used in systems with refrigeration units equipped

with hot gas defrost. The appliance has special defrosting

optimization functions and other special tasks to reduce the

amount of energy used by the controlled system.

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 in-

ternal buzzer for acoustic notiﬁcation of alarms, an RS485

serial communication interface with MODBUS-RTU com-

munication protocol and a calendar clock.

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).

The 4 outputs can be used to control the compressor or

the temperature control device, the defroster, the evapora-

tor fans and a conﬁgurable auxiliary device (Light, Alarm,

second evaporator, etc.).

The 4 temperature probe inputs can be used to control

the cell temperature, to measure the evaporator temperature

and othe two auxiliary temperatures (e.g.: product tem-

perature, condenser temperature, temperature of a sEcond

evaporator, etc.).

Two digital inputs are always available and, as an alterna-

tive to the Pr3 and Pr4 temperature probe inputs, two other

digital inputs can be conﬁgured.

The 2... 4 digital inputs can be conﬁgured to execute various

functions such as cell door signal, defrost commands, select-

ing a different temperature-control Set Point, reporting an

external alarm, activating a continuous cycle, activating the

auxiliary output, etc..

The model X34S have the “S-touch” capacitive sensor key-

board system.

1.2 Front panel description

X34

12 7

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 it

can be used together with the

key to change the pro-

gramming level of the parameters. When the keyboard is

locked it can be used together with the

(hold pressed

for 5 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 activating the Aux output, starting up the

continuous cycle, etc. (see functions of keys and ).

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, to-

gether 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 the key for 2 s to return in Nor-

mal mode. Hold pressed for 1 s, while in Normal mode,

it can also be programmed via parameter tuF to carry

out other functions such as turn ON and OFF (stand-by)

the device, activate the Aux output, start up the continu-

ous cycle, etc. (see functions of keys and ).

5. LED SET: During the normal operating mode, signals

that a ket is pressed. In programming mode indicates

the programming level of the parameters.

6. LED - COOL:

Indicates the output status (compres-

sor or temperature control device) when the istrument is

programmed for cooling operation: on (on), off (off) or

inhibited (ﬂashing).

7. LED - HEAT:

Indicates the output status (compres-

sor or temperature control device) when the istrument 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 Fan output status: on (on), off (off) or

inhibited (ﬂashing).

10. LED

:Shows the Alarm status (on), off (off) and Ac-

knowledged 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

ﬂashing slowly, it means that there is a clock error (clock

chip not working). If ﬂashing rapidly, it means the clock

battery is drained

13. LED Stand-By: When the instrument is in Stand-by

mode is the only lit LED.

Ascon Tecnologic - X34 - OPERATING INSTRUCTIONS - PAG. 3

2. PROGRAMMING

2.1 Fast Set Point programming

The Normal mode to program the setpoint is done by mo-

mentarily pressing the

key, the display shows SP (or SP2)

alternated to the programmed value.

To change it press the

key to increase the value or to

decrease it. These keys increase or decrease the value one

digit at a time, but if the button is pressed for more than one

sEcond the value increases or decreases rapidly and, after

two sEconds, the speed increases even more in order to

quickly reach the desired value.

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, reached the de-

sired value, press the

key to exit the Set Point program-

ming 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-

crease/decrease its value;

–When the desired value is reached press the key

to exit

Set Point programming mode.

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) 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 code

of parameter.

–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 the

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

Parameter

Increase

Value

Decrease

Value

-50.0s.ls.

-25.5

NORMAL MODE

Hold

for 2 s

Hold

for 5 s

Group

]SP

Hold

for 2 s

2.3 Parameter Protection Using The 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.

When the protection is active, press the

key to access the

parameters and keep it press for about 5 s, after which the

display shows r.P.

Press

, the display shows 0, 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.

Note: 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.

PARAMETERS

(PROGRAM MODE)

INS. CORRECT

PASSWORD

0.R.P.

-25.5

PASSWORD

REQUEST

S.LS

NORMAL MODE

Hold

for 2 s

Hold for 5 s Increase

Value

Decrease

Value

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 programming of the controller.

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.

Ascon Tecnologic - X34 - OPERATING INSTRUCTIONS - PAG. 4

–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 access level of the parameter

(on = not protected; blinking = protected by password).

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.

In case some parameters are not protected, accessing

the the programming mode the display ﬁrst shows the not

protected parameters, then the r.p parameter (through which

will be possible to access the “protected” parameters).

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

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 unprotect-

ed parameters if the t.PP parameter is given a password.

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.

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 the 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 in-

strument automatically disable the normal functions of the keys.

When the keyboard is locked, if any of the key is pressed,

the display shows Ln to indicate that the lock is active.

To unlock the keyboard it is enough to contemporarily push

+ keys and keep them pressed for 5 s, after which the

label LF appears on the display and all the key functions will

be available again.

2.7 Setting the current time and date

When the instrument is supplied 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.

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

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.14);

n. + 2 digits for the minutes (e.g.: n.52);

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.CL parameter,press the

key repeat-

edly to cycle through the following options:

y. + 2 digits for the current year (ex. y.10);

M.+ 2 digits for the and current month (ex. M.05);

d. + 2 digits for the and current date (ex. d.31).

When the internal clock is running, the

LED is lighted.

If LED is ON and steady indicates that, since the time the

clock was enabled, the instrument power supply has never

failed and therefore the current time is probably correct.

A ﬂashing

LED indicates that, after the clock has been

enabled, a power failure certainly occurred and therefore

the current time may not be correct. When in this condition,

pressing any key cancels the failure indication and the

LED returns to solid (on and not ﬂashing).

Ascon Tecnologic - X34 - OPERATING INSTRUCTIONS - PAG. 5

2.8 Scheduling events at deﬁned times

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:

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

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.

2.9 Displaying HACCP alarms

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.

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).

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

Ascon Tecnologic - X34 - OPERATING INSTRUCTIONS - PAG. 6

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.

4.1.1 Mechanical dimensions [mm]

X34

12.2

664

12.2

664

4.1.2 Panel cut-out

86 mm min.

41 mm min.

71+0.6 mm

+0.6

4.1.3 Mounting

Panel + Gasket max. 12 mm

“Butterfly”

brackets

Ascon Tecnologic - X34 - OPERATING INSTRUCTIONS - PAG. 7

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.

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 141516

Internal

Buzzer

Pr1 Pr2

DI1DI2 D+ D- GND

Pr3 Pr4

DI3DI4

Power

supply

Inputs RS485

2 A Gen.Use

10 A Res.

12 A Res. 30 LRA / 5 FLA

X34

Out2:

Out1:

Out3,4:

8 (3) A

16 (9) A10 (4) A

4 (4) A

2 (1) A5 (1) A

61810

60730 10E5 cycles, 0 T 50 °C

1718 1920 21 2223 2425 2627 28

NO NO NO

Out2

Out1

Out3

Out4

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.

If a power failure occours and then power 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 these modes is present the corre-

spondent differential (hysteresis):

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.

“Normal/Eco” mode operation

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 times deﬁned 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.

Ascon Tecnologic - X34 - OPERATING INSTRUCTIONS - PAG. 8

Temp.

Pr1

SPE

Door

r.d

r.Ed

i.Et

time“Norm.”

DAY (Shop open) DAY (Shop open)NIGHT (Shop closed)

“Norm.” “ECO”

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 deactivated.

If i.tt = oF the Eco/Normal mode switching due to time-out

is deactivated.

Temp.

SPE

r.d

r.Ed

i.tt (2) i.Et

time

Normal NormalECO

i.Et (1)

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 in Ecoal mode, the label Eco is displayed.

If i.dS = Ec the display sows the label Eco when the instru-

ment is in Ecoal mode. Otherwise the label Eco appears

approx. 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).

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 manually using the programmed com-

mand (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.

Setting r.HC = C3 gives the following operating cycle:

Temp.

SPE

Eco

SPH

Turbo

r.Hd

r.Ed

i.tt (2) r.tCr.tC

time

Normal TurboECOTurbo

i.Et (1)

r.d

Pr1

r.Hc = C3

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 ﬁg.) a Turbo cycle is automatically 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, Eco Set Point SPE can

be set between the values of SP and S.HS and the Turbo Set

Point SPH can be set between the values of S.LS and SP.

Note: In the examples that follow, the Set Point is generically

indicated as SP and the histeresis as r.d, however,

operationally, the instrument will act on the basis of

the Set Point and of the histeresis selected as active.

5.3 Measure and display configuration

All parameters concerning measuring input 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.);

Ascon Tecnologic - X34 - OPERATING INSTRUCTIONS - PAG. 9

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 alarms related to condenser

malfunctions (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 Probe 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 probes for the same func-

tion (priority goes to lowest 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 Pr2 probe measurement;

P4 Pr3 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 and the Pr1

measurement peaks by ciclically pressing and releasing the

key. The display will alternately show the code that identi-

ﬁes 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/OFF status if digital input);

Pr4 Pr4 probe measure (ON/OFF 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 with the actual hour;

n. + 2 digits with the actual minutes;

d. + 2 digits with the actual day;

When the instrument is switched OFF, Pr1 peak values are

always reset. However, it is possible to 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

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 function 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 function 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 Active set point (SP/SPE) selection with NO contact: at

input closure the temperature Set Point SPE is activated.

When instead the DI is open the Set Point active is SP.

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 notiﬁed and ot output deactivated by

NO contact:

at input closure the instrument

deactivates the

output conﬁgured as ot and activates the alarm and the

instrument display shows PrA alternated with the variable

deﬁned at i.dS parameter;

13 External HP alarm notiﬁed and ot output deactivated by

NO contact:

at input closure the instrument

deactivates the

output conﬁgured as ot and activates the alarm and the

instrument display shows HP alternating with the variable

deﬁned at i.dS parameter.

14 External HP alarm notiﬁed and ot output deactivated by

Ascon Tecnologic - X34 - OPERATING INSTRUCTIONS - PAG. 10

NO contact:

at input closure the instrument

deactivates the

output conﬁgured as ot and activates the alarm and 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.

-1... -17 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 defrost device (1);

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;

Controls an alarm that cannot be silenced through a

contact that is normally open and closed when in alarm;

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;

Output ON when the instrument is in ON state. This

mode can be used to control the shop lights, anti-fog

resistances

or other utilities;

HE Controls a heating device in neutral zone control

mode (r.HC = nr);

2d Controls the second defrost device;

L1 Shop light output managed by Normal/Eco mode.

This type of output is ON in Normal mode and OFF in

Eco mode operation.

Internal Light output managed by digital input. This out-

put will be ON when door is open (only if i.oF= 1, 2, 3);

oF Output disabled.

The function carried out for auxiliary output (o.oo= Au) 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, digital input or Real Time

Clock: the output is activated by pressing the a key or

/AUX when suitably conﬁgured (t.UF or t.Fb = 1) or by a

digital input command if conﬁgured (i.oF= 9) or by a RTC

event. The commands by key or digital input have a bi-sta-

ble (toggle) function. Bi-stable means that the 1st command

turns ON the output, while the 2nd turns the output OFF.

In this mode, the AUX output can be turned OFF auto-

matically after the time set at o.tu parameter. When o.tu

= oF the output is activated and deactivated only manu-

ally using a key ( or

/AUX), Digital Input or RTC

ON/OFF event, otherwise, the output, once activated, is

turned OFF automatically after the o.tu time. This func-

tion 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 ac-

tion of the keys or digital input (in this AUX output mode)

forces output status until the next event.

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 deactivated during defrost and post-defrost to

avoid the introduction of hot gas into the intake line.

The internal buzzer (if present) can be conﬁgured with pa-

rameter o.bu for the following functions:

oF Buzzer always disable;

1 Buzzer signal active alarms only;

2 Buzzer signal key pressed only (no alarm);

3 Buzzer signal active alarms and key pressed.

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;

r.HC the operating mode. Via the parameter r.HC the follow-

ing functions can be obtained:

CCooling; HHeating

Depending on the function mode programmed with param-

eter r.HC the differential is automatically considered by the

controller with positive values for a Refrigeration control

(r.HC = C) or negative values for a Heating control (r.HC = H).

Temp.

r.d

time

offoff

SP r.d

time

rHC= CrHC= H

offoffON ON ON ON ON

output

Pr1Temp.

Pr1

Ascon Tecnologic - X34 - OPERATING INSTRUCTIONS - PAG. 11

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 automatically assumed by the controller

to have positive values for the Cooling action and negative

values for the Heating action.

off off

Temp.

time

r.d

offoff

r.Hc

= nr

Outputs

Pr1

HC Cooling and Heating with two independent set points

As in the previous case, when r.HC = HC the output conﬁg-

ured 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 ac-

tive one (SP/SPE/SPH) while for HE output the Set Point is

SPH. The intervention differential for the ot output is the ac-

tive differential (r.d/r.Ed/r.Hd) and is automatically assumed

by the controller to have positive values for the Cooling ac-

tion while for the output HE the differential is r.Hd considered

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.

SPH

off off off

Temp.

time

r.d

r.Hd

offoff off

R.HC = HC

ON ON ON

ONON

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.

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 instru-

ment so that the ot output continues working in cycles accord-

ing to the times programmed with parameters r.t1 (activation

time) and r.t2 (deactivation time). If a Pr1 probe error occurs,

the instrument continues activating ot output for r.t1 time then

disabling it for r.t2 time and so on until the error persists.

By programming r.t1 = oF the ot output in probe error con-

dition remains OFF. On the other hand, programming r.t1 to

any value and r.t2 = oF the ot output, in probe error condi-

tion, 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.

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).

Temp.

time

offoff off off

r.d

P.P1

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

time

r.d

P.P2

ON ON

Temp.

Pr1

Output

P.P2 P.P2 P.P2

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

SP time

r.d

P.P3 P.P3 P.P3

P.P3

ON ON

Temp.

Pr1

Output

During the output inhibition the led OUT (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 activation delay of the Liquid solenoid valve and the de-

activation delay of the Aspiration solenoid valve (see “H OT-

GAS defrost operation for centralized systems”).

Ascon Tecnologic - X34 - OPERATING INSTRUCTIONS - PAG. 12

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 and dF.

The type of defrost is set by the parameter d.dt:

EL With electrical heating (or by compressor stop): dur-

ing defrost, the ot output is deactivated 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 defrosting

both the outputs (ot and dF) are enabled;

no Without compressor output conditioning: while

defrosting, the ot output continues to operate in order to

control the temperature, also dF output is enabled.

Et With electrical heating and defrosting temperature

control: while defrosting, the ot output is deactivated

while the output dF operates as evaporator tempera-

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 Liq-

uid solenoid valve (ot output), Hot gas solenoid valve

(dF output) and suction solenoid valve (Au outputwith

conﬁguration Fo = 3). During defrost, only the output dF

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 coiche 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. 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).

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

Counting mode interval and automatic defrost starts are set

through the d.dC parameter. d.dC possibe settings:

rt Intervals with counting of the total functioning time (in-

strument 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.

Defrost at all compressor stop. The instrument carries out

a defrost cycle at each compressor stop (i.e. at each deac-

tivation of the ot output) or however at d.di defrost interval

end with counts the total function time (instrument ON). 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 efﬁciency con-

ditions 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 (except

0) to enable the Dynamic Defrost Intervals System mode.

If d.dd = 0the Dynamic defrost 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

Ascon Tecnologic - X34 - OPERATING INSTRUCTIONS - PAG. 13

that detects a drop in the refrigerator thermal exchange perfor-

mance. In order to evaluate the thermal exchange efﬁciency,

near the ﬁrst passage from the operating Set Point, the instru-

ment stores the temperature difference (DT0) between the Pr1

probe (cell temperature) and the EP probe (evaporator).

Subsequently, the dynamic defrost algorithm allows to

highlight the heat exchange reductions by evaluating the

current temperature difference between the 2 probes (Pr1

and EP) and the stored one.

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 reduction

- 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 DT

between cell (Pr1) and evaporator (EP) probes from the DT

stored value, the instrument starts immediately a defrost.

To function correctly the instrument needs a DT reference

value, but, as all variations (Active Set Point, r.d differential

or the execution of a defrost cycle) delete the DT 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

01 2 3

Temp.

d.di/d.Sd time to defrost Phases 0, 1

Defrost

off off

DT0

d.tE

d.tS

Cool

Defrost

SP + r.d

Pr1

r.d

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 active in all modes of defrost operation

(d.dC = cL, rt, ct, cS).

Defrost by continuous compressor running time

The instrument start 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 in comparison to the normal working

conditions.

If d.cd = oF the function is disabled.

The function is active in all modes of defrost operation

(d.dC = cL, 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 not in pro-

gramming 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 (EP probe), when the evaporator

reaches a particular temperature.

If the evaporator probe is not used the duration cycle is set

by the parameter d.dE.

If instead the evaporator probe is used, the defrost cycle

ends when the temperature measured by the evaporator

probe 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.

If the temperature measured by the probe is higher than the

temperature set at parameter d.tS and d.tE the defrost is

inhibited.

d.tE

d.ts

Defrost

offoffoffON ON

Temp.

time

(NO defrost)

d.de

d.di (Defrost) d.di d.di d.di

(Defrost)

E.g.: Defrost Aends due to reaching of temperature d.tE,

defrosting Bends at the end of the d.dE time as the

temperature d.tE is not reached, defrosting Cdoes not

take place as the temperature is higher than d.tS.

d.tE

d.ts

offoffoff off

d.di

ON ON ON

time

d.di

(Defrost)

d.de

1°

Defrost

Temp.

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 to con-

trol evaporator temperature in heating mode with d.tE

Set Point and 1° differential (Hysteresis).

Ascon Tecnologic - X34 - OPERATING INSTRUCTIONS - PAG. 14

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

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.

If each evaporator is equipped with its own probe, an input

as evaporator probe 1 (i.P

= EP) and an input as evapora-

tor probe 2 (i.P

= 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

emperature readings

remains below the temperature set

at parameter d.tF for time d.St;

–The defrost end, in the sense of deactivation of the de-

froster 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

temperatures are not reached within the times set at pa-

rameters d.dE and d.d2 their respective defrosting actions

are interrupted. However, the end of defrost, as a control-

ler 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 Hot-gas defrost in centralized systems

The described operation is enable setting d.dt = HG.

With this mode is necessary to conﬁgure 3 outputs to set the

functions of:

–Liquid Solenoid Valve (output ot);

–Hot Gas Solenoid Valve (dF output);

–Aspiration Solenoid Valve (Au output with o.Fo = 3conﬁgu-

ration).

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 conformation of these plants in which

the evaporators are all in parallel and the compressors are

centralized and therefore, not controlled by the instrument

(to adjust the temperature the instrument controls the Liquid

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

Ascon Tecnologic - X34 - OPERATING INSTRUCTIONS - PAG. 15

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)

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.

The system conﬁgured for the Hot Gas defrost in central-

ized plants behaves as follows:

–At start-up, the Suction solenoid valve is activated im-

mediately (if set, respecting 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 controller phase, the Suction solenoid valve is

therefore always activated while the Liquid valve is acti-

vated as a function of the temperature control.

r.d

Liquid

(ot)

Temp.

time

P.P1

Pr1

Suction

(Au o.fo=3)

off

A) Defrosting occurs ﬁrst of all with the immediate deactiva-

tion (if active) of the Liquid valve (ot output);

B) So, after the delay set at parameter P.P2 also deactivates

the Suction valve (output Au conﬁgured with o.Fo = 3)

and, if parameter F.FE = oF, the fan output is also deacti-

vated (output Fn);

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 con-

tained 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;

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 deactivated and the delay times d.td (drip-

ping time) and F.Fd are activated (fans delay after defrost);

DWhen d.td time counting has elapsed, the output of the

Suction solenoid valve is reactivated, as when the instru-

ment is switched ON;

EIn 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-acti-

vated 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

defrost start when the Liquid valve is closed hafter 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

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 deactivated 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 in ot OFF condition will remain switched ON.

The parameter F.FE instead decides whether the fans must

Ascon Tecnologic - X34 - OPERATING INSTRUCTIONS - PAG. 16

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 parameterF.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.

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).

F.LF

F.FL

Temp.

F.dF

time

offoff offON ON

Note: Particular attention should be paid to the proper use of

fan-based temperature control functions, as in a typi-

cal refrigeration application, the evaporator fan stop

blocks the heat exchange.

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.

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.

All 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.

The possible selections of output parameters for the alarm

signalling function are:

When the output is to be activated in alarm condition and

can be deactivated manually by pressing any key of the

instrument (typical application for an acoustic signal);

AL When the output is to be activated in alarm condition but

cannot be deactivated manually; it is then deactivated

only when the alarm status ceases (typical application

for a light signal);

an When the output is to be activated in alarm condition

and must remain active even when the alarm status has

ceased. The disabling action (recognition of a stored

alarm) can only be carried out manually by pressing any

key when the alarm status has removed (typical applica-

tion for light signal).

-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:

Absolute alarms referred to Pr1 and display of label (H-L);

Relative alarms referred to Pr1 and display of label (H-L);

Absolute alarms referred to Au and display of label (H-L);

Relative alarms referred to Au and display of label (H-L);

Absolute alarms referred to CD and display of label (H-L);

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;

Absolute alarms referred to EP and display of label (H-L);

12 Absolute alarms referred to

, 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.

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.

By means of parameters A.A1 and A.A2 it is also possible to

set the action of the alarms on the control output and on the

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).

Ascon Tecnologic - X34 - OPERATING INSTRUCTIONS - PAG. 17

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.

= 1, 3, 5, 7, 9, 10),

the alarm thresholds are the same as those set at param-

eters A.H

and A.L

A.L1

A.H1 Temp.

A.d1

time

offoff off

ON ON

H1 L1

If the alarms are Relative alarms (A.

= 2, 4, 6, 8), the

alarm thresholds are: [SP + A.H

] and [SP + A.L

A.L1

A.H1

Temp.

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

and A.L

= 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 i.oF= 4, 5, 12, 13, 14

are activated.

Simultaneously to the conﬁgured alarm signal (buzzer and/or

output), the instrument point 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

and after the delay programmed at parameter A.oA, the instru-

ment signals the alarm via the activation of the conﬁgured

alarm output (buzzer/ouput), powering 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 in

the same parameter has elapsed.

Furthermore, alarm recording can also be disabled through

a conﬁgured digital input (i.

F= 13) or through the

or /

AUX

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: See paragraph “2.9 Displaying haccp alarms” a pagina

5for details.

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

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)

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 the

value is displayed.

Ascon Tecnologic - X34 - OPERATING INSTRUCTIONS - PAG. 18

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.

F= 11.

–By the parameter reset function (at the password prompt

r.P enter -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

= 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.= hours, n. = minutes);

–HACCP alarm duration (E. = hours, e. = minutes);

–Critical temperature reached (max. peak if Hi alarm or min.

peak if Lo alarm).

A.H1

Max.

temp.

Temp.

A.d1

time

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

) 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

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 recorded black-out alarm, the following data are

recorded:

–Alarm type (A. = bo);

–Start time

(y. = year, M. = month, d. =day, h.= hours, n. = minutes);

–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 “---”).

Temp.

at end of

Black-out

Temp.

time

BLACK-OUT

A.bo

E.e. time

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.= hours, n. = minutes);

–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

alarm

Temp.

at alarm

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 /AUX 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;

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

Ascon Tecnologic - X34 - OPERATING INSTRUCTIONS - PAG. 19

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.

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..

Hours (e.g. h.13);

n..

Minutes (e.g. n.45);

d..

Day of the week (e.g. d.1);

Type of event to be performed at the programmed time

(e.g. t.1).

Note: See “2.8 Scheduling events at deﬁned times” a pagina

5 for details.

The days 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 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 defrosting, also

program 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 Intefarce

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 (X34 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

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

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 - X34 - 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

USB

Enter

PWS

12 V

A B C TTL

USB

to PC

USB

For additional info, please look at the A01 instruction manual.

6.2 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.

This manual suits for next models

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