Emerson Dixell XM668D Wiring diagram

1592023040 XM668D GB r1.1 2011.07.05.doc XM668D 1/14
CONTROLLERS FOR MULTIPLEXED CABINETS
WITH STEPPER DRIVER INSIDE
XM668D
1. GENERAL WARNING ..................................................................................................................................... 1
2. GENERAL DESCRIPTION.............................................................................................................................. 1
3. INSTALLATION AND MOUNTING.................................................................................................................. 1
4. WIRING DIAGRAM AND CONNECTIONS..................................................................................................... 1
5. USER INTERFACE.......................................................................................................................................... 3
6. HOW TO PROGRAM THE PARAMETERS (PR1 AND PR2)........................................................................ 3
7. FAST ACCESS MENU .................................................................................................................................... 3
8. MENU FOR MULTIMASTER FUNCTION: SEC............................................................................................. 3
9. COMMISSIONING ........................................................................................................................................... 4
10. DISPLAY MESSAGES .................................................................................................................................... 5
11. USE OF THE PROGRAMMING “HOT KEY“ .................................................................................................. 5
12. CONTROLLING LOADS.................................................................................................................................. 5
13. TECHNICAL DATA.......................................................................................................................................... 7
1. GENERAL WARNING
1.1 PLEASE READ BEFORE USING THIS MANUAL
This manual is part of the product and should be kept near the instrument for
easy and quick reference.
The instrument shall not be used for purposes different from those described
hereunder. It cannot be used as a safety device.
Check the application limits before proceeding.
1.2 SAFETY PRECAUTIONS
Check the supply voltage is correct before connecting the instrument.
Do not expose to water or moisture: use the controller only within the operating
limits avoiding sudden temperature changes with high atmospheric humidity to
prevent formation of condensation
Warning: disconnect all electrical connections before any kind of maintenance.
Fit the probe where it is not accessible by the End User. The instrument must not
be opened.
In case of failure or faulty operation send the instrument back to the distributor or
to “Dixell S.r.l.” (see address) with a detailed description of the fault.
Consider the maximum current which can be applied to each relay (see
Technical Data).
Ensure that the wires for probes, loads and the power supply are separated and
far enough from each other, without crossing or intertwining.
In case of applications in industrial environments, the use of mains filters (our
mod. FT1) in parallel with inductive loads could be useful.
2. GENERAL DESCRIPTION
The XM668D is a microprocessor based controller for multiplexed cabinets suitable
for applications on medium or low temperature. It can be inserted in a proprietary
LAN with up to 8 different sections which can operate, depending on the
programming, as stand alone controllers or following the commands coming from the
other sections. The XM668D is provided with 4 relay outputs to control the solenoid
valve, defrost - which can be either electrical or hot gas - the evaporator fans, the
lights, and with the stepper valve driver. The device is also equipped with six probe
inputs: for temperature control, for control the defrost end temperature, for display
and the fourth can be used for application with virtual probe or for inlet/outlet air
temperature measurement. Moreover, fifth and sixth probe are used to evaluate and
control the superheat. Finally, the XM668D is equipped with the three digital inputs
(free contact) fully configurable by parameters.
The device is equipped with the HOTKEY connector that permits to be programmed
in a simple way. The optional direct serial output RS485 (ModBUS compatible)
permits a simple XWEB interfacing. RTC is available as options. The HOT-KEY
connector can be used to connect X-REP display (Depending on the model).
3. INSTALLATION AND MOUNTING
This device can operate without any user interface, but normal application is with
Dixell CX660 keyboard.
Figure 1a
Figure 1b
The
CX660 keyboard
shall
be mounted on vertical panel,
in a 29x71 mm hole, and
fixed using the special
bracket supplied as shown in
fig. 1a/1b. The temperature
range allowed for correct
operation is 0 to 60°C. Avoid
places subject to strong
vibrations, corrosive gases,
excessive dirt or humidity.
The same recommendations
apply to probes. Let air
circulate by the cooling holes.
Figure 1c
4. WIRING DIAGRAM AND CONNECTIONS
4.1 IMPORTANT NOTE
XM device is provided with disconnectable terminal block to connect cables with a
cross section up to 1.6 mm2 for all the low voltage connection: the RS485, the LAN,
the probes, the digital inputs and the keyboard. Other inputs, power supply and relay
connections are provided with screw terminal block or fast-on connection (5.0 mm).
Heat-resistant cables have to be used. Before connecting cables make sure the
power supply complies with the instrument’s requirements. Separate the probe
cables from the power supply cables, from the outputs and the power connections.
Do not exceed the maximum current allowed on each relay, in case of heavier loads
use a suitable external relay. N.B. Maximum current allowed for all the loads is 16A.
The probes shall be mounted with the bulb upwards to prevent damages due to
casual liquid infiltration. It is recommended to place the thermostat probe away from
air streams to correctly measure the average room temperature. Place the defrost
termination probe among the evaporator fins in the coldest place, where most ice is
formed, far from heaters or from the warmest place during defrost, to prevent
premature defrost termination.
4.2 XM668D
4.3 VALVE CONNECTIONS AND CONFIGURATION
WARNINGS
1. To avoid possible problems, before connecting the valve configure the
driver by making the right changes on the parameters. Select the kind of
motor (tEU parameter) and check if the valve is present in tEP
parameter table reported here below.
2. The max distance between an XM controller and a valve must not
exceed 10 m. To avoid any problems, use only shielded cables with
section greater than or equal to 0.325 mm² (AWG22).
!!!!! In any case, the unique and valid reference has to be considered the
datasheet made by valve manufacturer. Dixell cannot be considered
responsible in case of valve damaging due to wrong settings!!!!!!
tEP Model
LSt
(steps*10)
uSt
(steps*10)
CPP
(mA*10)
CHd
(mA*10)
Sr
(step/s)
0
Manual settings
Par
Par
Par
Par
Par
1
Alco EX4
-
EX5
-
EX6
5
75
50
10
500
2
Alco EX7
10
160
75
2
5
500
3
Alco EX8 500 step/s
10
260
80
5
0
500
4
Danfoss ETS
-
25/50
7
262
1
0
10
300
5
Danfoss ETS
-
100
10
353
10
10
300
6
Danfoss ETS
-
250/400 11 381 10
10
300
7
Sporlan SEI .5
to
11
0
159
16
5
200
8
Sporlan SER 1.5
to
20 0 159 12
5
200
9
Sporlan SEI
30
0
319
1
6
5
200
10
Sporlan SER(I) G,J,K
0
250
12
5
200
11
Sporlan SEI
-
50
0
638
16
5
200
12
Sporlan SEH(I)
-
100
0
638
16
5
200
13
Sporlan SE
H(I
)
-
175
0
638
16
5
200
If you can see your valve on the table, please select the valve through tEP
parameter. In this way, you can be sure of a right configuration. About the
connection, please pay attention to the following table to have a quick reference on
the connection mode for valves of different manufacturer
4 WIRES VALVES (BIPOLAR)
Connection
numbering
ALCO
EX4/5/6/7/8
SPORLAN
SEI-SEH-
SER
DANFOSS
ETS
45
BLUE
WHITE
BLACK
46
BROWN
BLACK
WHITE
47
BLACK
RED
RED
48
W
HITE
GREEN
GREEN

1592023040 XM668D GB r1.1 2011.07.05.doc XM668D 2/14
5-6 WIRES VALVES (UNIPOLAR)
Connection
numbering SPORLAN SAGINOMIYA
45
ORANGE
ORANGE
46
RED
RED
47
YELLOW
YELLOW
48
BLACK
BLACK
49
–
Common
GRAY
GRAY
AFTER MAKING THE CONNECTION, PLEASE SWITCH OFF AND ON THE
CONTROLLER IN ORDER TO BE SURE OF THE RIGHT POSITIONING OF THE
VALVE.
4.4 ABSOLUTE MAXIMUM POWER
XM668D is able to drive a wide range of stepper valves, on the following table are
indicated the maximum values of current that the actuator can supply to the stepper
wiring. The TF20D dIXEL transformer has to be used.
NOTE: the electrical power absorption of the valve can be unrelated to refrigeration
power that valve has. Before using the actuator, please read the technical manual of
the valve supplied by the manufacturer and check the maximum current used to drive
the valve in order to verify that they are lower than those indicated below.
VALVE
TYPE
BIPOLAR VALVES
(4 wires) Maximum Current 0.9A
UNIPOLAR VALVES
(5-6 wires) Maximum Current 0.33A
4.5 KEYBOARD DISPLAY CX660
The XM668D board can operate also without keyboard.
Polarity:
Terminal [34] [-]
Terminal [35] [+]
Use shielded cable in
case of long distance.
4.6 SYNCHRONIZED DEFROST – MAXIMUM 8 SECTIONS
Follow next steps to create a LAN connection, which is a necessary condition to
perform synchronized defrost (also called master-slave functioning):
1) Connect a shielded cable between terminals [38] [-] and [39] [+] for a maximum
of 8 sections;
2) The value of parameter Adr is the number to identify each electronic board.
Address duplication is not permitted, in this case the synchronized defrost
and the communication with monitoring system is not guaranteed (the Adr is
also the ModBUS address). For example, a correct configuration could be the
following:
If the LAN is well connected, the green LED will be ON. If the green LED blinks
then the connection is wrongly configured.
4.7 SENSORS FOR SUPERHEAT CONTROL
Temperature probe:
Pb6
terminals
[
19
]
-
[
20
]
without
any polarity.
Select the kind of sensor with P6C parameter.
Pressure transducer: Pb5 terminals:
[21] = input of the signal; [22] = Power Supply for
4to20mA transducer; [20] = GND; [23] = +5Vdc power
supply for ratiometric pressure transducer.
Select the configuration of the transducer with parameter P5C.
4.8 HOW TO USE ONLY ONE PRESSURE TRANSDUCER ON MULTIPLEXED
APPLICATIONS
A working LAN connection is required (green LED lit on all XM668D boards of the
same LAN). Connect and configure a pressure transducer only on one XM668D of
the network. Afterwards, the value of pressure read by the unique transducer
connected will be available to each device connected to the same LAN.
By pressing UP ARROW button, the user will be able to enter a fast selection menu
and to read the value of the following parameters:
dPP = measured pressure (only on master device);
dP5 = value of temperature obtained from pressuretemperature conversion;
rPP = pressure value read from remote location (only for slave devices).
Examples of error messages:
dPP = Err the local transducer read a wrong value, the pressure is out of the
bounds of the pressure transducer or the P5C parameter is wrong. Check all
these options and eventually change the transducer;
rPF the remote pressure transducer is on error situation. Check the status of the
onboard GREEN LED: if this LED is OFF the LAN is not working, otherwise
check the remote transducer.
LAST CHECKS ABOUT SUPERHEAT
On the fast access menu:
dPP is the value read by the gauge;
dP6 is the value read by the temperature probe, temperature of the gas on the outlet
section of the evaporator;
SH is the value of the superheat. The nA or Err messages mean that the superheat
has no sense in that moment and its value is not available.
4.9 HOW TO CONNECT MONITORING SYSTEM
1) Terminals [36] [-] and [37] [+].
2) Use shielded twisted cable. For
example Belden® 8762 o 8772 or cat 5
cables.
3) Maximum distance 1Km.
4) Don’t connect the shield to the earth or
to GND terminals of the device, avoid
accidental contacts by using insulating
tape.
Only one device for each LAN has to be connected to the RS485 connection.
The value of parameter Adr is the number to identify each electronic board. Address
duplication is not permitted, in this case the synchronized defrost and the
communication with monitoring system is not guaranteed (the Adr is also the
ModBUS address).
4.10 DIGITAL INPUTS
1) The terminals from [30] to [33] are all
free of voltage;
2) Use shielded cable for distance higher
than one meter;
For each input, has to be configured: the
polarity of activation, the function of the input
and the delay of signaling.
The parameters to perform this configuration are i1P, i1F, i1d respectively for
polarity, functioning and delay. The i1P can be: cL = active when closed; oP = active
when opened. The i1F parameter can be: EAL = external alarm, bAL = serious lock
alarm, PAL = pressure switch alarm, dor = door switch, dEF = external defrost, AUS
= auxiliary activation command, LiG = light activation, OnF = board On/OFF, FHU =
don’t use this configuration, ES = day/night, HdY = don’t use this configuration. Then
there is i1d parameter for delay of activation. For the others digital inputs there are a
set of the same parameters: i2P, i2F, i2d, i3P, i3F, i3d.
4.11 ANALOG OUTPUT
Selectable between 4 to 20mA and
0 to 10Vdc.
Use CABCJ15 to perform the
connections
It’s located near the terminal [39] on a 2-pin connector. It’s possible to use the output
to control anti-sweat heaters through a chopped phase controller XRPW500
(500watt) or family XV...D or XV...K.

1592023040 XM668D GB r1.1 2011.07.05.doc XM668D 3/14
5. USER INTERFACE
5.1 DIRECT COMMAND INTERFACE
5.2 ICONS
Cooling output
↓
With icon ON the
output is active, while
with blinking icon there
is a delay.
MEASUREMENT
UNIT
°C, Bar and (time)
are ON depending on
the selection.
Light →
←Fan
Defrost →
AUX ←Auxiliary relay
Energy saving →
←Multimaster Enabled
Generic alarm →
←Clock / time
DURING PROGRAMMING
: blink the measurement units of temperatu
re and
pressure
5.3 KEYBOARD COMMANDS
Single commands:
LIGHT relay
Press light button.
AUX relay
Press down arrow.
Manual defrost
Press and hold for 3 sec the defrost button
ON/OFF
Press for 3
sec
the
ON/OFF
button (if the function is
enabled).
E
nergy
S
a
ving
Press for 3
sec
the
ON/OFF
button (if the function is
enabled).
Double commands:
Press and hold for about 3 sec to lock (Pon) or unlock (PoF) the
keyboard.
Pressed together to exit from programming mode or from menu; on
submenus rtC and EEV this combination allow to come back to
previous level.
Pressed together for 3 sec allow to access to first level of
programming mode.
5.4 HOW TO MODIFY THE SET POINT FOR AIR TEMPERATURE REGULATION
The thermostat set point is the value that will be used to regulate the air temperature.
The regulation output is controlled by the electronic valve or by the relay.
BEGIN
Press SET button for 3 sec, the measurement units
will blink together.
Value
modification or
With the arrows it’s possible to change the value
within the LS and US parameters value.
EXIT
By pressing SET it is possible to confirm the value
that will blink for about 2 sec.
In any case, it is possible to wait for about 10 sec to exit. In order to show the air
temperature set is sufficient to press and release the SET button, the value is
displayed for about 60 sec.
6. HOW TO PROGRAM THE PARAMETERS (PR1 AND PR2)
The device provide 2 programming levels: Pr1 with direct access and Pr2 protected
with a password (intended for experts).
ACCESS
to Pr1
Press and hold for about 3 sec to have access to
the first programming level (Pr1).
Select item or Select the parameter or submenu using the arrows.
Show value Press SET button.
Modify or Use the arrows to modify the value.
Confirm
and store Press SET key: the value will blink for 3 sec, and
then the display will show the next parameter.
EXIT
Instantaneous exit from the programming mode,
otherwise wait for about 10 sec (without press any
button).
6.1 HOW TO HAVE ACCESS TO “PR2”
To enter Pr2 programming menu:
1. access the Pr1 menu by pressing both SET+DOWN keys for 3 sec, the first
parameter label will be showed;
2. press DOWN key untill the Pr2 label will be showed, then press SET key;
3. The blinking PAS label will be showed, wait some seconds;
4. Will be showed “0 - -” with blinking 0: insert the password [321] using the keys
UP and DOWN and confirming with SET key.
GENERAL STRUCTURE: The first two item rtC and EEV are related to submenus
with others parameters.
SET+UP keys on rtC or EEV submenus allow coming back to parameter list,
SET+UP keys on parameter list allow immediate exit.
6.2 HOW TO MOVE PARAMETER FROM PR1 TO PR2 AND VICE VERSA
Enter on Pr2; select the parameter; press both SET+DOWN keys; a left side LED ON
gives to the parameter the presence on Pr1 level, a left side LED OFF means that the
parameter is not present on Pr1 (only Pr2).
7. FAST ACCESS MENU
This menu contains the list of probes and some values that are automatically
evacuate by the board such as the superheat and the percentage of valve opening.
The values: nP or noP stands for probe not present or value not evacuate, Err value
out of range, probe damaged not connected or incorrectly configured.
Entering fast
access menu
By press and release the
UP
arrow
.
The
duration
of the menu in case of inactivity is about 3 min.
The values that will be showed depend on the
configuration of the board.
Use
or
arrows to
select an
entry,
then press
to see the
value or to
go on with
other value.
HM Access to clock menu or reset of the RTC alarm;
An Value of analog output;
SH Value of superheat. nA = not Available;
oPP Percentage of valve opening.
dP1 (Pb1) Value read by probe 1.
dP2 (Pb2) Value read by probe 2.
dP3 (Pb3) Value read by probe 3.
dP4 (Pb4) Value read by probe 4.
dP5 (Pb5) Temperature read by probe 5 or value obtained from
pressure transducer.
dP6 (Pb6) Value read by probe 6.
dPP Pressure value read by (Pb5) transducer.
rPP Virtual pressure probe, only on slave.
L°t Minimum room temperature;
H°t Maximum room temperature;
dPr Virtual probe for room temperature regulation [rPA and rPb];
dPd Virtual probe for defrost management [dPA and dPb];
dPF Virtual probe for fan management [FPA and FPb];
rSE Real thermoregulation set point: the value includes the sum of
SET, HES and/or the dynamic set point if the functions are
enabled.
Exit
Pressed together or wait the timeout of about 60
sec
8. MENU FOR MULTIMASTER FUNCTION: SEC
The function “section” SEC is enabled when icon is lit. It allows entering in the
remote programming mode, from a keyboard not physically connected to the board,
through the LAN functionality.

1592023040 XM668D GB r1.1 2011.07.05.doc XM668D 4/14
Action Button or
display Notes
Enter
menu Press UP arrow for about 3 sec, the icon will be
ON.
Waiting
for action SEC The menu to change the section will be entered. SEC
label will be displayed.
Enter
section
list
Press SET to confirm. The following list will be
available to select the proper network function.
Select
proper
function
Or
LOC
ALL
SE1
SEn
SE8
To gain access only to the local device.
To gain access to all the devices connected to the
LAN.
To gain access to the device with 1st Adr (*)
…
To gain access to the device with 8th Adr (*)
Confirm Select and confirm an entry by pressing SET button.
Exit menu
Press
SET
and
UP
together
or
wait
about 10
seconds.
(*) The devices on the LAN are indexed by using the Adr parameter (in ascending
order).
EXAMPLES:
1. To modify the same parameter values in all the devices connected to the LAN:
enter multimaster menu. Select and confirm ALL. Exit from multimaster menu.
Enter the programming menu and change the required parameter values.
The new values will be changed on all devices connected to the LAN.
2. To modify a parameter value in the device with [Adr = 35]: find the relevant
indexed section (the one linked to [Adr = 35]). Enter multimaster menu. Select
and confirm this section from the multimaster menu. Exit from multimaster
menu. Enter the programming menu and change the required parameter value.
3. If the alarm nod is present: enter the multimaster menu. Select and confirm the
LOC section. Exit from multimaster menu.
AT THE END OF THE PROGRAMMING PROCEDURE, SELECT THE
SECTION “LOC”. IN THIS WAY THE ICON WILL BE SWITCHED OFF!!
9. COMMISSIONING
9.1 CLOCK SETTING AND RTC ALARM RESET
Parameter configuration: [CbP = Y] enable the clock, [EdF = rtC] enable the defrost
from rtc Ld1...Ld6.
BEGIN UP arrow (press once) to access the fast access
menu
Display HM identify the clock RTC submenu; press
Display
HUr = hour press to confirm/modify
Min = minutes press to confirm/modify
…… don’t use others parameters if present.
EXIT
Press for about 10 sec. The operation resets the RTC
alarm.
Note: the rtC clock menu is present also on the second level of parameters.
Warning: if the board shows the rtF alarm, the device has to be changed.
9.2 ELECTRONIC VALVE SETTINGS
Some parameters have to be checked:
[1] Superheat temperature probe: Ntc, Ptc, Pt1000 with parameter P6C. The
sensor has to be fixed at the end of the evaporator.
[2] Pressure transducer: [4 to 20mA] or ratiometric P5C = 420 or 5Vr with
parameter P5C.
[3] Range of measurement: check the parameter of conversion PA4 and P20 that
are related to the transducer.
TRANSDUCER: [-0.5/7Bar] or [0.5/8Bar abs] the correct setup is relative pressure
with PA4 = -0.5 and P20 = 7.0. The [0.5/12Bar abs] the correct setup is relative
pressure with PA4 = -0.5 and P20 = 11.00.
Example of virtual pressure with unique [4 to 20mA] or [0 to 5V] transducer:
Param.
XM6
x8D
_1
without transducer
XM6x8D_2
+
with
transducer
XM6x8D_3+
without transducer
Adr n n + 1 n + 2
LPP LPP = n LPP = Y LPP = n
P5C LAN or not connect
the probe P5C= 420 or 0-5V LAN or not connect the probe
PA4 Not used -0.5 bar Not used
P20 Not used 7.0 bar Not used
[4] From EEV submenu: select the correct kind of gas with FTY parameter.
[5] Use the following parameters to setup the right valve driving, according to the
valve datasheet from the manufacturer.
tEU Type of Stepper motor: [uP-bP] it permits to select the kind of valve. uP = 5 -
6 wires unipolar valves; bP = 4 wires bipolar valves; !!!!! WARNING !!!!! by
changing this parameter the valve has to be reinitialized.
tEP Predefined valve selection: [0 to 10] if [tEP = 0] the user has to modify all
the parameters of configuration in order to use the valve. If tEP is different
from 0 the device performs a fast configuration of the following parameters:
LSt, uSt, Sr, CPP, CHd. To select the right number please read the following
table:
tEP Model
LSt
(steps*10)
uSt
(steps*10)
CPP
(mA*10)
CHd
(mA*10)
Sr (step/s)
0
Manual
settings
Par
Par
Par
Par
Par
1
Alco EX4
-
EX5
-
EX6
5
75
50
10
500
2
Alco EX7
10
160
75
2
5
500
3
Alco EX8 500 step/s
10
260
80
5
0
500
4
Danfoss ETS
-
25/50
7
262
1
0
10
300
5
Danfoss ETS
-
100
10
353
10
10
300
6
Danfoss ETS
-
250/400 11 381 10
10
300
7
Sporlan
SEI .5
to
11
0
159
16
5
200
8
Sporlan SER 1.5
to
20 0 159 12
5
200
9
Sporlan SEI 30
0
319
1
6
5
200
10
Sporlan SER(I) G,J,K
0
250
12
5
200
11
Sporlan SEI
-
50
0
638
16
5
200
12
Sporlan SEH(I)
-
100
0
638
16
5
200
13
Sporlan SEH(I)
-
175
0
638
16
5
200
If tEP is different from 0 previous configuration of LSt, uSt, Sr, CPP and CHd are
overwritten.
LSt Minimum number of steps: [0to USt] it permits to select the minimum
number of steps. At this number of steps the valve should be closed. So it’s
necessary the reading of manufacturer datasheet to set correctly this
parameter. It’s the minimum number of steps to stay in advised range of
functioning. !!!!! WARNING !!!!! By changing this parameter the valve has
to be reinitialized. The device performs this procedure automatically and
restarts its normal functioning when the programming mode ends.
USt Maximum number of steps: [LSt to 800*10] it permits to select the maximum
number of steps. At this number of steps the valve should be completely
opened. Read the datasheet provided by manufacturer of the valve to set
correctly this parameter. It’s the maximum number of steps to stay in advised
range of functioning. !!!!! WARNING !!!!! By changing this parameter the
valve has to be reinitialized. The device performs this procedure
automatically and restarts its normal functioning when the programming
mode ends.
Sr Step rate [10 to 600 step/sec] it’s the maximum speed to change step without
losing precision (means without losing steps). It’s advised to stay under the
maximum speed.
CPP Current per phase (only bipolar valves): [0 to 100*10mA] it’s the maximum
current per phase used to drive valve. It’s used only with bipolar valves.
CHd Holding current per phase (only bipolar valves): [0 to 100*10mA] it’s the
current per phase when the valve is stopped for more than 4 minutes. It’s used
only with bipolar valves.
9.3 ELECTRONIC VALVE FUNCTIONING
ON/OFF TEMPERATURE REGULATION [CrE = n]
1. The HY parameter is a differential [2°C default].
2. The temperature regulation is ON/OFF with valve stop at set point.
3. The superheat is regulated to be closer to its set point.
4. With more pauses normally also the humidity is bigger.
5. Regulation pauses can be realized using Sti and Std parameters (during these
pauses the valve is closed).
COUNTINUOUS REGULATION OF THE TEMPERATURE [CrE=Y] (with superheat
regulation):
1. The HY parameter becomes temperature band for PI control. A default good
value is 5°C.
2. The regulation of injection is continuous and the cooling output is always on.
The icon is always ON excluding the defrost phase.
3. The superheat is regulated following the SSH parameter.
4. Regulation pauses can be realized using Sti and Std parameters (during these
pauses the valve is closed).
5. Increasing the Int integral time it is possible to decrease the speed of reaction
of the regulator on the HY band.
COUNTINUOUS REGULATION OF THE TEMPERATURE [CrE=Y] (without
superheat regulation):
1. The HY parameters become temperature band for PI control. A default good
value is 5°C.
2. The regulation of injection is continuous and the cooling output is always on.
The icon is always ON excluding the defrost phase.
3. The superheat is not regulated because the valve is at the end of the
evaporator. At the beginning of the evaporator there is another valve.
4. Regulation pauses can be realized using Sti and Std parameters (during these
pauses the valve is closed).
5. Increasing the Int integral time it is possible to decrease the speed of reaction
of the regulator on the HY band.
9.4 SYNCHRONIZED DEFROST
The synchronized defrost allow to manage multiple defrost from different boards
connected through the LAN connection. In this way, the boards can perform
simultaneous defrosts with the possibility to end them in a synchronized way.

1592023040 XM668D GB r1.1 2011.07.05.doc XM668D 5/14
The Adr parameter cannot be duplicated because in this case the defrost
cannot be correctly managed.
BEGIN
Press for 3 sec, the rtC or other will be showed.
The measurement unit blinks.
Find Adr
Press more than once the DOWN arrow to find the
Adr parameter, the press SET.
Modify
Adr or
Set the value of Adr parameter, then press SET to
confirm the parameter.
EXIT
Press the two keys together to exit from menu or
wait for about 10 sec.
The LSn and LAn parameter are only to show the actual settings (read only). Se the
following example of configuration:
DAILY DEFROST FROM RTC: [CbP = Y] and [EdF = rtC]
idF Parameter: for safety reason force the value of idF at +1 respect to the interval
between two Ld parameters. The idF timer is reinitialized after defrost and at every
power-on.
DEFROST START: at the time selected by the parameters Ld1 to Ld6 or Sd1 to
Sd6.
DEFROST END: if the probes reach the dtE temperature or for maximum MdF time.
SAFETY and rtC or rtF ALARM: with clock alarm the device will use the parameter
idF, dtE and MdF.
WARNING: don’t set [EdF=rtC] and [CPb=n].
MULTIMASTER DEFROST: all the probes with clock
Table for example
Par.
Unit
A (RTC)
Unit
B (RTC)
Unit C
(RTC)
Ad
r
n N + 1 N + 2
EdF
rtC (clock) rtC (clock) rtC (clock)
CbP
Y Y Y
IdF
9 hours safety 9 hours safety 9 hours safety
MdF
45 min safety 45 min safety 45 min safety
d
t
E
12°C safety 12°C safety 12°C safety
Ld1
06:00 1° 06:00 1° 06:00 1°
Ld2
14:00 2° 14:00 2° 14:00 2°
Ld3
22:00 3° 22:00 3° 22:00 3°
10. DISPLAY MESSAGES
Display
Causes
Note
s
KEYBOARD
1 nod
No display: the keyboard is trying
to work with another board that is
not working or not present
Press for 3 sec UP arrow,
enter
the SEC menu and select LOC
entry.
2 Pon Keyboard is unlocked
3 PoF Keyboard is locked
4 rSt Alarm reset Alarm output deactivated
5 noP, nP
nA
Not present (configuration)
Not available (evaluation)
ALARM FROM PROBE INPUT
6
P1
P2
P3
P4
P5
P6
PPF
CPF
Sensor brake down, value out of
range or sensor incorrectly
configured P1C, P2C to P6C.
PPF can be showed by slaves of
pressure that don’t receive the
value of pressure.
CPF is showed when the remote
probe 4 is not working.
P1: the cooling output works
with Con and COF,
With defrost probe on error the
defrost is performed only at
interval.
For P5, P6 and PPF: the
percentage of the valve
opening is fixed at PEO value.
TEMPERATURE ALARM
7 HA
Temperature alarm from parameter
ALU on probe rAL.
8 LA
Temperature alarm from parameter
ALL on probe rAL.
9 HAd
Alarm from parameter
dLU
on
probe defrost probe [dPa / dPb].
10 LAd
Alarm from parameter
dLU
on
probe defrost probe [dPa / dPb].
11 HAF
Alarm from parameter
FLU
on
probe defrost probe [FPa / FPb].
12 LAF
Alarm from parameter
FLL
on
probe defrost probe [FPa / FPb].
DIGITAL INPUT ALARM
13 dA
Door open alarm from input
i1F
,
i2F or i3F = after delay d1d, d2d
or d3d.
Cooling relay and fan follow the
odc parameter. Cooling restart
as specified on rrd parameter.
14 EA Generic alarm from digital input
i1F,i2F,i3F=EAL.
15 CA Severe alarm of regulation lock
from digital input i1F,i2F,i3F=bAL. Regulation output OFF.
16 PAL
Pressure switch lock
i1F
,
i2F
o
i3F
= PAL. All the outputs are OFF.
ELECTRONIC VALVE ALARM
17 LOP Minimum operating pressure
threshold from LOP parameter.
The valve output increases its
opening of dML quantity every
second.
18 MOP Maximum operating pressure
threshold from MOP parameter.
The valve output decreases its
opening of dML quantity every
second.
19 LSH Low superheating from LSH
parameter and SHd delay.
The valve will be closed; the
alarm will be showed after SHd
delay.
20 HSH
High superheating from
HSH
parameter and SHd delay. Only display.
CL
OCK ALARM
21 rtC Clock settings lost.
Defrost will be performed with
IdF till restoring the settings of
RTC.
22 rtF Clock damaged. Defrost will be performed with
IdF.
OTHERS
23
EE
EEPROM serious problem. Output OFF.
24 Err Error with upload/download
parameters. Repeat the operation.
25 End Parameters have been correctly
transferred.
10.1 ALLARM RECOVERY
Probe alarms P1, P2, P3 and P4 start some seconds after the fault in the related
probe; they automatically stop some seconds after the probe restarts normal
operation. Check connections before replacing the probe.
Temperature alarms HA, LA, HA2 and LA2 automatically stop as soon as the
temperature returns to normal values.
Alarms EA and CA (with i1F = bAL)recover as soon as the digital input is disabled.
Alarm CA (with i1F = PAL) recovers only by switching off and on the instrument.
11. USE OF THE PROGRAMMING “HOT KEY“
The XM units can UPLOAD or DOWNLOAD the parameter list from its own E2
internal memory to the HOT-KEY and vice-versa through a TTL connector. Using
HOT-KEY the Adr will not changed.
11.1 DOWNLOAD (FROM THE HOT-KEY TO THE INSTRUMENT)
1. Turn OFF the instrument by means of the ON/OFF key, insert the HOT-KEY
and then turn the unit ON.
2. Automatically the parameter list of the HOT-KEY is downloaded into the
controller memory: the doL message is blinking. After 10 seconds the
instrument will restart working with the new parameters. At the end of the data
transfer phase the instrument displays the following messages: End for right
programming. The instrument starts regularly with the new programming. Err
for failed programming. In this case turn the unit off and then on if you want to
restart the download again or remove the HOT-KEY to abort the operation.
11.2 UPLOAD (FROM THE INSTRUMENT TO THE “HOT KEY”)
1. When the XM unit is ON, insert the HOT-KEY and push è key; the uPL
message appears.
2. The UPLOAD begins; the uPL message is blinking.
3. Remove the HOT-KEY.At the end of the data transfer phase the instrument
displays the following messages:
End = right programming;
Err = failed programming. In this case push SET key if you want to restart the
programming again or remove the not programmed HOT-KEY.
12. CONTROLLING LOADS
12.1 THE COOLING OUTPUT
The regulation is performed according to the temperature measured by the
thermostat probe that can be physical probe or virtual probe obtained by a weighted
average between two probes following the formula:
value_for_room_regulation = (rPA*rPE + rPb*(100-rPE))/100
If the temperature increases and reaches set point plus differential the solenoid valve
is opened and then it is closed when the temperature reaches the set point value
again.In case of fault in the thermostat probe the opening and closing time of
solenoid valve is configured by Con and CoF parameters.
12.2 STANDARD REGULATION AND CONTINUOUS REGULATION
The regulation can be performed in three ways: the goal of the first way (standard
regulation) is reaching the best superheat via a classic temperature regulation
obtained using hysteresis. The second way permits to use the valve to realize an high
performance temperature regulation with a good factor of superheat precision. This

1592023040 XM668D GB r1.1 2011.07.05.doc XM668D 6/14
second possibility, it can be used only in centralized plants and it is available
only with electronic expansion valve by selecting [CrE=Y] parameter. The third
kind of regulation has been thought to be used with vales called evaporator valves
[CrE=EUP], in this configuration the valve is placed at the end of the evaporator. In
any case, the regulation is performed via PI regulator that gives the opening
percentage to the valve.
Standard regulation: [CrE=n]
In this case, the HY parameter is the differential for standard ON/OFF regulation. In
this case the int parameter is neglected.
Continuous regulation: [CrE=Y]
In this case, the HY parameter is the proportional band of PI in charge of room
temperature regulation and we advise to used at least [HY = 5.0°C/10°F]. The int
parameter is the integral time of the same PI regulator. Increasing int parameter the
PI regulator become slowly in reaction and of course is true vice versa. To disable the
integral part of regulation you should set [int=0].
Evaporator valves: [CrE=EUP]
In this case, the system performs a regulation of the temperature without thinking
about the superheat (in fact the valve is at the end of the evaporator). The HY
parameter is the proportional band for the temperature regulation and int is the
integral time for the regulation. In this situation there is no superheat regulation.
12.3 DEFROST
Defrost starting
In any case, the device check the temperature read by configured defrost probe
before starting defrost procedure, after that:
-(If RTC is present)Two defrost modes are available through the tdF parameter:
defrost with electrical heater and hot gas defrost. The defrost interval is controlled
by parameter EdF: (EdF=rtC) defrost is made in real time depending on the hours
set in the parameters Ld1 to Ld6 in workdays and in Sd1 to Sd6 on holidays;
(EdF=in) the defrost is made every idF time.
-Defrost cycle starting can be operated locally (manual activation by means of the
keyboard or digital input or end of interval time) or the command can come from
the Master defrost unit of the LAN. In this case the controller will operate the
defrost cycle following the parameters it has programmed but, at the end of the drip
time, will wait that all the other controllers of the LAN finish their defrost cycle
before to re-start the normal regulation of the temperature according to dEM
parameter.
-Every time any of the controller of the LAN begin a defrost cycle it issue the
command into the network making all the other controllers start their own cycle.
This allows a perfect synchronization of the defrost in the whole multiplexed
cabinet according to LMd parameter.
-Differential defrost: Selecting dPA and dPb probes and by changing the dtP and
ddP parameters the defrost can be started when the difference between dPA and
dPb probes is lower than dtP for all ddP time. This is useful to start defrost when a
low thermal exchange is detected. If [ddP=0] this function is disabled.
-
Defrost ending
-When defrost is started via rtC, the maximum duration of defrost is obtained from
Md parameter and the defrost end temperature is obtained from dtE parameter
(and dtS if two defrost probes are selected).
-If dPA and dPb are present and [d2P=Y],the instrument stops the defrost
procedure when dPA is higher than dtE temperature and dPb is higher than dtS
temperature.
At the end of defrost the drip time is controlled through the Fdt parameter.
12.4 FANS
CONTROL WITH RELAY
The fan control mode is selected by means of the FnC parameter:
C-n = running with the solenoid valve, OFF during the defrost;
C-Y = running with th1e solenoid valve, ON during the defrost;
O-n = continuous mode, OFF during the defrost;
O-Y = continuous mode, ON during the defrost.
An additional parameter FSt provides the setting of temperature, detected by the
evaporator probe, above which the fans are always OFF. This can be used to make
sure circulation of air only if his temperature is lower than set in FSt.
CONTROL WITH ANALOG OUTPUT (if present)
The modulating output [trA=rEG] works in proportional way (excluding the first AMt
seconds where the fans speed is the maximum. 10seconds is the minimum value).
The regulation set point is relative to regulation set point and is indicated by ASr, the
proportional band is always located above [SET+ASr] value and its value is PbA.
The fans are at minimum speed AMi when the temperature read by fan probe is
[SET+ASr] and the fan is at maximum speed (AMA) when the temperature is
[SET+ASr+PbA].
12.5 ANTI SWEAT HEATERS
The anti-sweat heater regulation can be performed with on board relay (if oA6=AC)
or with the analog output (if present by setting trA=AC). However the regulation can
be performed in two ways:
Without real dew-point information: in this case the default value for dew-
point is used (SdP parameter).
Receiving dew-point from XWEB5000 system: the SdP parameter is
overwritten when valid value for dew-point is received from XWEB. In
case of XWEB link is lost, SdP is the value that will be used for safety.
The best performance can be obtained using probe 4. In this case, the regulation
follows the chart:
Probe 4 should be placed on the showcase glass. For each cabinet can be used
only one probe 4 (P4) sending its value to the others section that are connected to
the LAN.
HOW TO WORK WITH PROBE 4 THROUGH THE LAN:
Param.
XM6x8D_1
Without probe 4
XM6x8D_2 +
with
probe 4
XM6x8D_3
+
Without probe 4
Adr n n + 1 n + 2
LCP LCP = n LCP = Y LCP = n
P4C LAN or not
connect the probe
P4C = NTC, PtC or
PtM
LAN or not connect
the probe
trA trA = AC if the device has the analog output
oA6 oA6 = AC if the device will use the AUX relay for regulation
HOW TO WORK WITHOUT PROBE 4:
Param.
XM6x8D
Without probe 4
P4C nP
AMt % of ON
In this case, the regulation is performed by
switching on and off the auxiliary relay on a
60 minutes time base. The ON time will be
the AMt value, so that the relay will be ON for
AMt minutes and OFF for [60-AMt] minutes.
In case of P4 error or if P4 is absent the output is at AMA value for the AMt time then
the output is at 0 value for the time [255–AMt] time performing a simple PWM
modulation.

1592023040 XM668D GB r1.1 2011.07.05.doc XM668D 7/14
12.6 AUXILIARY OUTPUT
The auxiliary output is switch ON and OFF by means of the corresponding digital
input or by pressing and releasing the down arrow key.
13. TECHNICAL DATA
CX660 keyboard
Housing: self extinguishing ABS
Case: CX660 fascia 35x77 mm; depth 18mm
Mounting: panel mounting in a 29x71 mm panel cut-out
Protection: IP20
Frontal protection: IP65
Power supply: from XM600 power module
Display: 3 digits, red LED, 14.2 mm high
Optional output: buzzer
Power modules
Case: 8 DIN
Connections: Screw terminal block 1.6 mm2heat-resistant wiring and 5.0mm fast-
on or screw terminals.
Power supply: 24Vac
Power absorption: 20VA max
Inputs: up to 6 NTC; PTC; Pt1000 probes
Digital inputs: 3 free of voltage
Relay outputs: Total current on loads MAX. 16A
Solenoid Valve: relay SPST 5A, 250Vac
Defrost: relay SPST 16A, 250Vac
Fan: relay SPST 8A, 250Vac
Light: relay SPST 16A, 250Vac
Alarm: SPDT relay 8A, 250Vac
Aux: SPST relay 8A, 250Vac
Outputs for valve: bipolar or unipolar valves
Optional output (AnOUT) DEPENDING ON THE MODELS:
PWM / Open Collector outputs: PWM or 12Vdc max 40mA
Analog output: 4 to 20mA or 0 to 10V
Serial output: RS485 with ModBUS - RTU and LAN
Data storing: on the non-volatile memory (EEPROM)
Kind of action: 1B
Pollution degree: normal
Software class: A
Operating temperature: 0 to 60°C (32 to 140°F)
Storage temperature: -25 to 60°C (-13 to 140°F)
Relative humidity: 20 to 85% (no condensing)
Measuring and regulation range:
NTC probe: -40 to 110°C (-58 to 230°F)
PTC probe: -50 to 150°C (-67 to 302°F)
Pt1000 probe: -100 to 100°C (-148 to 212°F)
Resolution: 0.1°C or 1°C or 1°F (selectable)
Accuracy (ambient temp. 25°C): ±0.5°C ±1 digit

1592023040 XM668D GB r1.1 2011.07.05.doc XM668D 8/14
DEFAULT PARAMETER MAP
The numbers of the first column are simple indexes that are unrelated to the position on the device menu. The total amount of parameters can be different depending on the
applications. SUBMENUS: the parameters O1...O24 of the clock belongs to rtC label; V1...V30 ELECTRONIC VALVE belongs to EEV.
LABEL VALUE DESCRIPTION RANGE NOTES
rtC
CLOCK AND DEFROST
By pressing SET it’s
possible to enter on RTC submenu Access to CLOCK submenu (if present)
CbP Y Clock Presence n; Y -
Hur - - - Hours. - - - -
Min - - - Minutes. - - - -
dAY - - - Day of the week. Sun(0); SAt(6) -
Hd1 nU First weekly day. Sun(0); SAt(6); nu(7) Set the first day of the week which follows the holiday
times.
Hd2 nU Second weekly day. Sun(0); SAt(6); nu(7) Set the second day of the week which follows the
holiday times.
Hd3 nU Third weekly day. Sun(0); SAt(6); nu(7) Set the third day of the week which follows the holiday
times.
iLE 0.0 Energy saving cycle start during workdays. 0.0 to 23h50min (143)
During the Energy Saving cycle the set point is
increased by the value in HES so that the operation set
point is [SET + HES].
Format: hours.10min, resolution: 10min.
dLE 0.0 Energy saving cycle length during workdays. 0.0 to 24h00min (144)
Set the duration of the Energy Saving cycle on
workdays.
Format: hours.10min, resolution: 10min.
iSE 0.0 Energy saving cycle start during holidays. 0.0 to 23h50min (143) Format: hours.10min, resolution: 10min.
dSE 0.0 Energy saving cycle length during holidays. 0.0 to 24h00min (144) Format: hours.10min, resolution: 10min.
HES 0.0 Temperature increasing during Energy Saving cycle
(Day/Night).
[-30.0°C to 30.0°C]
[-54°F to 54°F]
Set the increasing value of the set-point during the
Energy Saving cycle.
Ld1 6.0 Workdays First defrost start. 0.0 to 23h50min (143)
nU (144)
Workdays defrost start: [Ldn to 23h50min] these
parameters set the beginning of the eight
programmable defrost cycles during workdays. Ex:
when [Ld2 = 12.4] the second defrost starts at 12.40
during workdays.
nU = not used.
Format: hours.10min, resolution: 10min.
Ld2 13.0 Workdays Second defrost start. Ld1 to 23h50min (143)
nU (144)
Ld3 21.0 Workdays Third defrost start. Ld2 to 23h50min (143)
nU (144)
Ld4 nU Workdays Fourth defrost start. Ld3 to 23h50min (143)
nU (144)
Ld5 nU Workdays Fifth defrost start. Ld4 to 23h50min (143)
nU (144)
Ld6 nU Workdays Sixth defrost start. Ld5 to 23h50min (143)
nU (144)
Sd1 6.0 Holidays First defrost start. 0.0 to 23h50min (143)
nU (144)
Holidays defrost start: [Sdn to 23h50min] these
parameters set the beginning of the eight
programmable defrost cycles on holidays. Ex: when
[Sd2 = 3.4] the second defrost starts at 3.40 on
holidays.
nU = not used.
Format: hours.10min, resolution: 10min.
Sd2 13.0 Holidays Second defrost start. Sd1 to 23h50min (143)
nU (144)
Sd3 21.0 Holidays Third defrost start. Sd2 to 23h50min (143)
nU (144)
Sd4 nU Holidays Fourth defrost start. Sd3 to 23h50min (143)
nU (144)
Sd5 nU Holidays Fifth defrost start. Sd4 to 23h50min (143)
nU (144)
Sd6 nU Holidays Sixth defrost start. Sd5 to 23h50min (143)
nU (144)
EEU ELECTRONIC VALVE By pressing SET you can enter electronic expansion
valve submenu.
FtY 404 Kind of gas. R22(0); 134(1); 404(2); 407(3);
410(4); 507(5); CO2(6)
Type of gas used by plant. Fundamental parameter
for correct functioning of all system.
SSH 8.0 Superheat set point. [0.1°C to 25.5°C]
[1°F to 45°F] This is the value used to regulate superheat.
Pb 6.0 Proportional band. [0.1°C to 60.0°C]
[1°F to 108°F]
The valve changes its opening on the band
[SSH
,
SSH
+ Pb]. At SSH value of superheat the valve will be at
0% (without integral contribution) and at [SSH + Pb]
value of superheat the valve will be at MnF. For values
bigger than [SSH + Pb] the valve is completely
opened.
inC 120 Integration time for superheat regulation. 0 to 255s -
PEO 50 Valve opening in case of error on probes P5 or P6. 0 to 100% If a temporary probe error occurs, valve opening
percentage is PEo until PEd time is elapsed.
OPE 85 Start opening percentage for the time SFd. 0 to 100% Opening valve percentage when start function is active.
This phase duration is SFd time.
SFd 1.3 Duration of soft start phase with opening at OPE. 0.0 to 42min00sec (252)
Set start function duration and post-defrost duration.
During this phase the alarms are neglected.
Format: min.10sec, resolution: 10 sec.
OPd 100 Post defrost opening percentage for all the time
PddB. 0 to 100% Opening valve percentage when after defrost function is active. This phase duration is Pdd time.
Pdd 1.3 Duration of post defrost phase. 0.0 to 42min00sec (252)
Set start function duration and post-defrost duration.
During this phase the alarms are neglected.
Format: min.10sec, resolution: 10 sec.
MnF 100 Maximum percentage of opening admitted (during
normal functioning). 0 to 100% During regulation it sets the maximum valve opening percentage.
Fot nU Manual opening. 0 to 100%
nU
It permits to force the valve opening to the specified
value. This value overwrites the one calculated by PID
algorithm.
!!!! WARNING !!!!
It must be [Fot = nU] to have correct superheat
regulation.

1592023040 XM668D GB r1.1 2011.07.05.doc XM668D 9/14
PA4 -0.5 Probe value at 4mA or at 0V.
Meas
Unit Range
BAR [PrU=rE] -1.0 to P20
[PrU=Ab] 0.0 to P20
PSI [PrU=rE] -14 to P20
[PrU=Ab] 0 to P20
dKP [PrU=rE] -10 to P20
[PrU=Ab] 0 to P20
Value of pressure at 4mA for current probe [4 to 20mA]
or value at 0V for ratiometric probes. The value is
absolute or relative according to PrU parameter.
P20 11.0 Probe value at 20mA or at 5V.
Meas
Unit Range
BAR [PrU=rE] PA4 to 50.0
[PrU=Ab] PA4 to 50.0
PSI [PrU=rE] PA4 to 725
[PrU=Ab] PA4 to 725
dKP [PrU=rE] PA4 to 500
[PrU=Ab] PA4 to 500
Value of pressure at 20mA for current probe [4 to
20mA] or value at 5V for ratiometric probes. The value
is absolute or relative according to PrU parameter.
LPL -0.5 Lower Pressure Limit for superheat regulation. PA4 to P20
EXPERT:
w
hen suction pressure goes down
the
lower
bound LPL, superheat regulation will use a fixed
pressure value. Otherwise, the normal pressure value
will be used (according to PrU parameter).
MOP 11.0 Maximum operating pressure threshold and valve
closing of dML value. LOP to P20
If suction pressure exceeds maximum operating
pressure value, the instrument will signal this situation
giving the MOP alarm (according to PrU parameter).
LOP -0.5 Minimum operating pressure threshold and valve
opening of dML value. PA4 to MOP
If suction pressure exceeds minimum operating
pressure value, the instrument will signal this situation
giving the LOP alarm (according to PrU parameter).
dML 30 Delta [MOP - LOP]. 0 to 100%
Until
MOP
alarm is active, the valve will
close
, every
cycle period, of a value equal to the dML percentage.
Until LOP alarm is active, the valve will open, every
cycle period, of a value equal to the dML percentage.
MSH 60.0 Maximum superheat alarm threshold. [LSH to 80.0°C]
[LSH to 144°F]
If superheat value exceeds
MSH
value, the display will
show the MSH message until delay time SHd will
expire.
LSH 2.0 Minimum superheat alarm threshold. [0.0°C to MSH]
[0°F to MSH]
If the superheat value
is lower than
LSH
during the
SHd delay time, then the display will show the
message LSH. As soon as the superheat value is
lower than LSH value, the valve will close
immediately, without waiting the SHd delay time (to
avoid evaporator flooding).
SHY 0.5
Hysteresis for superheat alarm
recovery
[MSH
–
SHY] and [LSH + SHY].
[0.1°C to 25.5°C]
[1°F to 45°F] -
SHd 3.0 Delay of superheat alarm signaling. 0.0 to 42min00sec (252)
If a superheat alarm occurs, the delay time
SHd
will
have to expire before the controller shows an alarm.
Format: min.10sec, resolution: 10sec.
FrC 0 Integration additive constant (Fast-recovery). 0 to 100s
P
ermits to
increase integral time when
SH
value
is
below the set-point. If [FrC = 0] fast recovery function is
disabled.
tEU bP Kind of valve. uP; bP
uP
= unipolar
valve
(5
-
6 wires);
bP = bipolar valve (4 wires).
tEP nU Predefined valve selection. nU to 10 See par. 4.3.
nU = manual setting.
LSt 0 Minimum number of steps where the valve can be
considered as completely closed. 0 to USt (* 10) For manual adjusting of the valve.
USt 0 Maximum number of steps that can be performed. LSt to 800 (* 10) For manual adjusting of the valve.
Sr 10 Step rate: is the speed to change step. A too high
value causes a wrong driving. 10 to 600 (steps/sec) For manual adjusting of the valve.
CPP 0 Current per phase during bipolar valve driving. 0 to 100 (*10mA) For manual adjusting of the valve.
CHd 0 Current per phase to maintain the actual position
(Holding current). 0 to 100 (*10mA) For manual adjusting of the valve.
REGULATION
HY 5.0 Differential. [0.1°C to 25.5°C]
[1°F to 45°F]
If
[
CrE
=
n
]
then
HY
is
the
hysteresis for ON/OFF
thermoregulation. If [CrE = Y] or [CrE = EUP] then HY
is the proportional band for temperature PI controller.
On these cases the value should be greater than 5°C.
int 150 Integral time for room temperature regulation. 0 to 255s
This value is used
only when
[
CrE
=
Y
]
or
[
CrE
=
EUP]. It’s the integral time for thermoregulation: high
values mean slower regulation.
0 (zero) = no integral action.
CrE Y Continuous regulation activation. n(0); Y(1); EUP(2)
With
[
CrE
=
Y
]
or
[
CrE
=
EU
P
]
the regulation become
PI, HY become a band and int an integral time.
n= standard regulation;
Y= continuous regulation, to be used only in
centralized plants;
EUP = evaporator valves (see par. 12.2).
LS -30.0 Minimum set point. [-55.0°C to SET]
[-67°F to SET] Set the minimum acceptable value for the set-point.
US 20.0 Maximum set point. [SET to 150.0°C]
[SET to 302°F] Set the maximum acceptable value for the set-point.
odS 0 Outputs activation delay at start up. 0 to 255min
This function is enabled at the initial start up of the
instrument and inhibits any output activation for the
period of time set in this parameter (N.B.: AUX and
Light can work).
AC 0 Anti-short cycle delay. 0 to 60min Interval between the solenoid valve stop and the
following restart.

1592023040 XM668D GB r1.1 2011.07.05.doc XM668D 10/14
CCt 0.0 Continuous cycle duration. 0.0 to 24h00min (144)
Compressor ON time during continuous cycle:
allows to set the length of the continuous cycle:
compressor stays on without interruption for the CCt
time. It can be used, for instance, when the room is
filled with new products.
Format: hours.10min, resolution: 10min.
CCS 0.0 Continuous cycle set point. [-55.0°C to 150.0°C]
[-67°F to 302°F]
Set point for continuous cycle:
used value during the
continuous cycle.
Con 15 Compressor ON time with faulty probe. 0 to 255min
Solenoid valve ON time with faulty probe:
time
during which the solenoid valve is active in case of
faulty thermostat probe. With COn = 0 solenoid valve is
always OFF.
CoF 30 Compressor OFF time with faulty probe. 0 to 255min
Solenoid valve OFF time with faulty probe:
time
during which the solenoid valve is off in case of faulty
thermostat probe. With COF = 0 solenoid valve is
always active.
CF °C Temperature measurement unit. °C(0); °F(1)
°C
=
Celsius
;
°F = Fahrenheit.
!!! WARNING !!!
When the measurement unit changes, all parameters
with temperature values will have to be checked.
PrU rE Pressure Mode. rE(0); Ab(1)
It defines the mode to evaluate the pressure values.
!!! WARNING !!!
PrU value is used for all the pressure parameters. If
[PrU = rE] all pressure parameters are in relative
pressure unit, if [PrU = Ab] all pressure parameters are
in absolute pressure unit.
PMU bAr Pressure measurement unit. bAr(0); PSI(1); MPA(2)
It selects the pressure measurement units.
MPA
means
the value of pressure measured by kPA*10.
rES dE Resolution (only °C). dE; in
It sets decimal point display.
in = 1°C;
dE = 0.1 °C.
Lod tEr Local display: default display.
nP(0); P1(1); P2(2);
P3(3); P4(4); P5(5);
P6(6); tEr(7); dEF(8)
It selects which probe is displayed by the instrument.
nP = no probe;
P1, P2, P3, P4, P5, P6, tEr = virtual probe for
thermostat;
dEF = virtual probe for defrost.
rEd tEr Remote display: default display.
nP(0); P1(1); P2(2);
P3(3); P4(4); P5(5);
P6(6); tEr(7); dEF(8)
It selects which probe is displayed by the X-REP.
nP = no probe;
P1, P2, P3, P4, P5, P6, tEr = virtual probe for
thermostat;
dEF = virtual probe for defrost.
dLY 0 Display delay. 0.0 to 24h00min (144)
When the temperature changes, the display will be
updated of 1°C / 1°F when delay time expires.
Format: min.10sec, resolution: 10sec.
rPA P1 Regulation probe A. nP(0); P1(1); P2(2);
P3(3); P4(4); P6(5)
First probe used
to regulate room temperature. If
[rPA
= nP] the regulation is performed with real value of
rPb.
rPb nP Regulation probe B. nP(0); P1(1); P2(2);
P3(3); P4(4); P6(5)
Second probe used to regulate room temperature. If
[rPb = nP] the regulation is performed with real value
of rPA.
rPE 100 Virtual probe percentage (room temperature). 0 to 100%
It defines the percentage of the
rPA
respect to
rPb
.
The value used to regulate room temperature is
obtained by:
value_for_room = (rPA*rPE + rPb*(100-rPE))/100
DEFROST
dPA P2 Defrost probe A. nP(0); P1(1); P2(2);
P3(3); P4(4); P6(5)
First probe used for defrost. If
[rPA = nP]
the regulation
is performed with real value of dPb.
dPb nP Defrost probe B. nP(0); P1(1); P2(2);
P3(3); P4(4); P6(5)
Second probe used for defrost. If
[rPB = nP]
the
regulation is performed with real value of dPA.
dPE 100 Virtual probe percentage (defrost temperature). 0 to 100%
It defines
the percentage of the
dPA
respect to
dPb
.
The value used to regulate room temperature is
obtained by:
value_for_defrost= (dPA*dPE + dPb*(100-dPE))/100
tdF EL Defrost kind. EL; in
EL
= defrost with electrical heater;
in = hot gas defrost.
EdF in Defrost mode. rtC; in
rtC
=
defrost activation via RTC with
Ld1
,
Ld2
...
parameters;
in =defrost activation with idF parameter.
dtP 0.1 Difference between two probes to activate the
defrost.
[0.1°C to 25.5°C]
[1°F to 45°F]
If the difference between two defrost probes stays
lower than dtP, for all ddP time, the defrost will be
activated.
ddP 60 Delay before activation of differential defrost (dtP). 0 to 60min See “Differential desfrost” in par. 12.3.
d2P n End defrost control with two probes. n; Y
n
=
only the
dPA
probe is used to defrost
management;
Y = the instrument stops the defrost when dPA is
higher than dtE temperature and dPb is higher than
dtS temperature.
dtE 8.0 End defrost temperature on probe A (dPA). [-55.0°C to 50.0°C]
[-67°F to 122°F]
Set the temperature measured by the evaporator probe
dPA which stops the defrost. N.B.: parameter enabled
only when the evaporator probe is present.
dtS 8.0 End defrost temperature on probe B (dPb). [-55.0°C to 50.0°C]
[-67°F to 122°F]
Set the temperature measured by the evaporator probe
dPb which stops the defrost. N.B.: parameter enabled
only when the evaporator probe is present.