Emerson Dixell XC645CX User manual

XC645CX
(v. 3.4)

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INDEX
1. BEFORE PROCEEDING 5
1.1 CHECK THE SW REL.OF THE XC645CX 5
2. GENERAL WARNING 5
2.1 PLEASE READ BEFORE USING THIS MANUAL 5
2.2 SAFETY PRECAUTIONS 5
3. GENERAL DESCRIPTION 5
4. COMPONENTS RELATED TO THE XC645CX 6
4.1 CWC15KIT AND CWC30KIT:WIRING KITS 6
4.2 CABCJ15 OR CABCJ30: 2PIN CONNECTORS 7
4.3 PP07, PP11, PP30 PP50: 4÷20MAPRESSURE TRANSDUCERS7
4.4 NP4-67: PIPE MOUNTING TEMPERATURE PROBE 7
4.5 XJ485CX: TTL /RS485 SERIAL CONVERTER 7
5. WIRING & ELECTRICAL CONNECTIONS 8
5.1 GENERAL WARNINGS 8
5.2 WIRING CONNECTIONS 8
5.3 PROBES CONNECTION 9
5.4 LOAD CONNECTIONS 10
5.5 SAFETY AND CONFIGURABLE DIGITAL INPUTS –FREE VOLTAGE 10
5.6 ANALOG OUTPUT CONNECTION 11
5.7 HOW TO CONNECT MONITORING SYSTEM -RS485 SERIAL LINE 11
6. MOUNTING & INSTALLATION 12
7. FIRST INSTALLATION 13
7.1 HOW TO SET THE KIND OF GAS 13
7.2 HOW TO SET THE RANGE OF THE PRESSURE PROBES 13
8. USER INTERFACE 14
8.1 DISPLAYING 14
8.2 KEYBOARD 14
8.3 ICONS 15
9. HOW TO SEE AND MODIFY THE SET POINT(S) 15
9.1 HOW TO SEE THE SET POINT OF COMPRESSORS AND/OR FANS 15
9.2 HOW TO MODIFY THE SET POINT OF COMPRESSORS AND/OR FANS 16
10. THE INFO MENU 16
11. PARAMETERS PROGRAMMING 17
11.1 HOW TO ENTER THE “PR1” PARAMETER LIST 17

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11.2 HOW TO ENTER IN PARAMETERS LIST “PR2” 17
11.3 HOW TO CHANGE PARAMETER VALUES 17
12. HOW TO DISABLED AN OUTPUT 18
12.1 HOW TO DISABLED AN OUTPUT DURING A MAINTENANCE SESSION. 18
12.2 OUTPUT DISABLED SIGNALING. 18
12.3 REGULATION WITH SOME OUTPUTS DISABLED. 18
13. RUNNING HOURS OF LOADS 18
13.1 HOW TO DISPLAY THE RUNNING HOURS OF A LOAD. 18
13.2 HOW TO RESET THE RUNNING HOURS OF A LOAD. 18
14. ALARM MENU 19
14.1 HOW TO SEE THE ALARMS 19
15. KEYBOARD LOCKING 19
15.1 HOW TO LOCK THE KEYBOARD 19
15.2 TO UNLOCK THE KEYBOARD19
16. USE OF THE PROGRAMMING “HOT KEY “ 20
16.1 HOW TO PROGRAM A HOT KEY FROM THE INSTRUMENT (UPLOAD) 20
16.2 HOW TO PROGRAM AN INSTRUMENT USING A HOT KEY (DOWNLOAD) 20
17. LIST OF PARAMETERS 20
17.1 PLANT DIMENSIONING AND TYPE OF REGULATION. 20
17.2 PROBES CONFIGURATION 22
17.3 OTHERS INPUTS CONFIGURATION 24
17.4 DISPLAY AND MEASUREMENT UNIT 25
17.5 COMPRESSOR REGULATION 26
17.6 LIQUID INJECTION THERMOSTAT 27
17.7 FANS REGULATION 27
17.8 ALARMS –COMPRESSOR SECTION 27
17.9 ALARMS –DLT SECTION 28
17.10 ALARMS –FANS SECTION 28
17.11 SUCTION SUPERHEAT 28
17.12 DYNAMIC SET POINT FOR FAN 29
17.13 ANALOG OUTPUT (OPTIONAL) 29
17.14 OTHER 30
18. TYPE OF REGULATION 32
18.1 DIGITAL SCROLL REGULATION 32
18.2 PROPORTIONAL BAND REGULATION -ONLY FOR FANS 36
18.3 CONDENSER WITH INVERTER OR EC FANS–ANALOG OUTPUT SETTING 37
18.4 ANALOG OUTPUT “FREE”38
19. ADDITIONAL FUNCTIONS 39
19.1 COMPRESSOR RUNNING PROOF FUNCTION 39
19.2 FLOOD PROTECTION FUNCTION 40
19.3 SUCTION SUPERHEAT MONITORING 41
19.4 HOT GAS INJECTION VALVE 42

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20. ALARM LIST 42
20.1 TYPES OF ALARMS AND SIGNALING MANAGED 42
20.2 BUZZER MUTING 45
20.3 ALARM CONDITIONS –SUMMARY TABLE 46
21. TECHNICAL FEATURES 49
22. PARAMETERS –DEFAULT VALUES 50

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1. BEFORE PROCEEDING
1.1 Check the sw rel. of the XC645CX
1. Look at the SW rel. of XC64D printed on the label of the controller.
2. If the SW release is 3.4, proceed with this manual otherwise contact Dixell to get the
right manual.
2. GENERAL WARNING
2.1 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.
•Dixell Srl reserves the right to change the composition of its products, even without notice,
ensuring the same and unchanged functionality.
2.2 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.
•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.
•Fit the probe where it is not accessible by the end user.
•In case of applications in industrial environments, the use of mains filters (our mod. FT1) in
parallel with inductive loads could be useful.
3. General description
The XC645CX is designed to manage both compressors and fans in a condensing system such
as a pack.
The compressors can be digital scroll, simple, multistage.

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Control is by means of a neutral zone or proportional band and is based on the pressure or
temperature sensed in the LP suction (compressors) and HP (condenser) circuits. A special
algorithm balances the run hours of the compressors to distribute the work load uniformly.
The controllers can convert both suction and discharge pressures and displays them as
temperatures.
The front panel offers complete information on the system’s status by displaying the suction and
condenser pressure (temperatures), the status of the loads, possible alarms or maintenance
conditions.
Each load has its own alarm input that is able to stop it when activated. To guarantee the total
system’s safety, there are also two inputs for low and high pressure switches: when these are
activated, the system is stopped.
By means of the HOT KEY the controller can be easy programmed at power on.
The controller can be connected to the X-WEB, controlling and monitoring system, thanks to the
serial TTL output, using the standard ModBus RTU protocol.
4. COMPONENTS RELATED TO THE XC645CX
Name
Description
Part number
Transformer
TF5 230V/12Vac
CD050010 00
Wiring kit 1.5m and 3m
CWC15-Kit (1,5m)
CWC30-Kit (3,0m)
DD500101 50
DD500103 00
Female disconnect able connector for digital input
or analog output (4pcs)
CABCJ15 (1,5m)
CABCJ30 (3,0m)
DD200101 50
DD200103 00
TTL /RS485 serial converter
XJ485CX+CABRS02
J7MAZZZ9AA
4-20mA suction pressure transducer
PP11 (-0.5÷11bar)
BE009302 07
4-20mA condenser pressure transducer
PP30 (0÷30bar)
BE009302 04
Hot key for programming
HOT KEY 4K
DK00000100
4.1 CWC15KIT and CWC30KIT: wiring kits
The XC645CX is provided with 2 socket
connectors with 14 and 6 pins.
For the wiring the CWC15KIT (1.5m cable
length)or CWC30KIT (3.0m cable length) have
to be used.

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4.2 CABCJ15 or CABCJ30: 2 PIN connectors
NOTE:
Use the connection cable CABCJ15 (1.5m
lenght) or the CABCJ30 (3.0m lenght) for the:
- HP digital input (25-26),
- i2F configurable digital input (27-
28),
- 0-10Vdc or 4-20mA analogue
output (23-24)
- oA6, 12Vdc/40mA digital output (21-
22) :
4.3 PP07, PP11, PP30 PP50: 4÷20mA pressure transducers
NAME
CABLE LENGTH
RANGE
DIXELL CODE
PP07
2,0MT
-0,5+7 bar rel FE
BE009302 00
PP11
2,0MT
-0,5+11 bar rel FE
BE009302 07
PP30
2,0MT
0+30 bar rel FE
BE009302 04
PP50
2,0MT
0+50 bar rel FE
BE009302 05
4.4 NP4-67: pipe mounting temperature probe
The NP4-67 temperature probe
can be used on the discharge line
to monitor the discharge
temperature of the Digital Scroll
compressor.
NP4-67 1.5MT NTC probe
Measurement range: -40+110°C,
Cable 1,5mt
Code BN609001 52
4.5 XJ485CX: TTL / RS485 serial converter
The XJ485CX is a TTL/RS485 external
converter. Insert it into the TTL receptacle to
convert the TTL output into a RS485 (+) and (-)
signal for the monitoring system MODBUS_RTU
compatible. (XWEB).

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5. WIRING & ELECTRICAL CONNECTIONS
5.1 General warnings
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 3A resistive, see also Technical
Features, in case of heavier loads use a suitable external relay.
5.2 Wiring connections
Power supply: model at 12Vac/dc supply: use terminals 1-2
Power supply: model at 124Vac/dc supply: use terminals 1-2
- Always use a class 2 transformer with minimum power 5VA such as TF5.
- Terminals [21-22], [23-24], [25-26], [27-28] are provided with JST 2 PINS connectors, they
require the CABCJ15 (1,5mt) or CABCJ30 (3mt) wiring cables

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5.3 Probes connection
5.3.1 General warnings
If using terminal ends be sure there are no bear parts which could cause short circuiting or
introduce noise disturbance at high frequencies. To minimize the induced disturbances use
shielded cables with the shield connected to earth.
Pressure probe (4 - 20 mA): respect the polarity. If using terminal ends be sure there are no
bear parts which could cause short circuiting or introduce noise disturbance at high frequencies.
To minimize the induced disturbances use shielded cables with the shield connected to earth.
Temperature probe: it is recommended to place the temperature probe away from direct air
streams to correctly measure the temperature.
5.3.2 Probe wirings
Low voltage side (14PINs connector): Keep the cables away from the power cables. Use shielded
cable to lengthen the cables.
NOTE1: The PIN 4 is the common line for the temperature probes
NOTE2: The PIN 6 gives a 12Vdc supply for the 4-20mA pressure transducers
PP07 PP11, PP30, PP50 4÷20mA pressure
transducers respect the polarity.
Suction (P1C = Cur)
Brown (+) to terminal 6 ; white (-) to terminal 5
Condenser (P2C = Cur)
Brown (+) to terminal 6 ; white (-) to terminal 7
Suction 2 - optional (P3C = Cur)
Brown (+) to terminal 6; white (-) to terminal 3
3 5 7
4 6 8
12V
40mA
§
Pb1
Pb3 Pb2
Temperature probes (NTC 10K)
Suction: 4-5 (P1C = NTC)
Condenser: 4-7 (P2C =NTC)
Pb3 (P3C = NTC): 4-3
3 5 7
4 6 8
Pb1Pb3 Pb2
Ratiometric transducers (0.5÷4.5Vdc)
Suction (P1C = 0-5)
5 (In); 4(+); 10 (gnd)
Condenser (P2C =0-5)
7 (In); 4(+); 10 (gnd)
Suction 2 - optional (P3C = 0-5)
3 (In); 4(+); 10(gnd)
5V
4 0 m A
§
1 3 5 7 9
2 4 6 8 10
+
In
Pb1 Pb2
In
Gnd
In
Pb3

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5.4 LOAD CONNECTIONS
!!!WARNING: Digital Scroll valve coil MUST operate at main voltage (230Vac or 115Vac)!!!!
NOTE: Main voltage side (6PINs connector): the PIN 17 is the common line for all the relay outputs
and for the TRIAC.
5.5 SAFETY AND CONFIGURABLE DIGITAL INPUTS –FREE
VOLTAGE
5.5.1 Loads safety inputs
!!!WARNING: free voltage inputs!!!!
Controller has 7 configurable digital inputs, free voltage.
Each digital input can be set by the related parameter iF01,.. iF07.
The digital inputs are factory pre-set to operate as safety input for loads and as HP and LP. This
input has to collect the status of the safety devices relatedto the compressor such as thermistors,
pressure switches etc.
When this input is activated the correspondence load is switched off and not considered for the
regulation.
The correspondence between loads (compressors or fans) and safety inputs is the following
LOAD
TERMINALS
INPUT
TERMINALS
SETTING
Load 1
15-17
Di1
10-13
iF01 = oA1
Load 2
16-17
Di2
10-14
iF02 = oA2
Load 3
18-17
Di3
10-11
iF03 = oA3
Load 4
20-17
Di4
10-12
iF04 = oA4
Load 6
21-22
Di7
27-28
iF07 = oA6
5.5.2 Circuit with 1 SUCTION and 1 CONDENSER: HP –LP Pressure
switch connections
The controller is preset to manage also the low pressure switch and the high pressure switch,
both the inputs are free voltage.
Connect the pressure switches as described in the following table.

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PRESSURE SWITCH
INPUT
TERMINALS
SETTING
LP
Di5
10-9
iF05 = LP1
HP*
Di6
25-26
iF06 = HP
* The digital input 6 (25-26) requires the adapter CABCJ15 or CABCJ30 to be used.
See par. Error! Reference source not found. Error! Reference source not found.
5.5.3 Additional function of the digital input 7 (27-28)
The digital input 7 can operate also as probe.
To enable this function set P4C as NTC or PTC.
5.6 Analog output connection
The controller supply up to 2 analog outputs, terminals, kind of output and functionality are shown
in the following table
Terminals
Related parameter
Analog output 1
23[+] –24[-].
AOC: Kind of signal (4-20mA/0-10V)
AOF: function
Analog output 2
8[+] –10[-].
2AOC: Kind of signal (4-20mA/0-10V)
2AOF: function
5.7 How to connect monitoring system - RS485 Serial line
The XC645CX can be connected to a monitoring system thanks to the serial output.
To convert the TTL to RS485 signal, the XJ485CX has to be used.
The XJ485CX is a TTL/RS485 external converter. Insert it into the TTL receptacle to convert the TTL
output into a RS485 (+) and (-) signal for the monitoring system MODBUS_RTU compatible. (XWEB).
The Adr parameter is the number to identify each electronic board. Address duplication is not
permitted, in this case the communication with monitoring system is not guaranteed (the Adr is
also the ModBUS address).

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6. Mounting & installation
The instruments are suitable only for internal use. Instruments shall be mounted on panel, in a
29x71 mm hole, and fixed using the special brackets supplied.
The ambient operating temperature range is between -10÷60°C.
Avoid locations subject to heavy vibration, corrosive gases or excessive dirt. The same applies to
the probes. Ensure ventilation around the instrument.
78,5
36,9
59,5
28,5
6
70
29
71

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7. First installation
At first installation, it’s necessary the following:
1. Select the kind of gas.
2. Set the range of the pressure probes.
In the following paragraph a short cut for the above operations.
Chapters 11 Parameters programming and 17 will show in detail these operations.
7.1 How to set the kind of gas
The controller has memorized the relation between temperature and pressure for some gases.
The pre-set gas is: r404. (FtyP=r404)
If another gas is used, act as in the following:
1. Enter the Programming mode by pressing the Set and DOWN key for 3s.
2. Select the “Pr2” parameter. Then enter the password 3 2 1 0.
3. Select the FtyP, kind of gas, parameter.
4. Press the “SET” key: the value of the parameter will start blinking.
5. Use “UP” or “DOWN” to change the gas among the following: r22= R22; r134=134,
r404=R404A; - 407A = r407A; 407C= r407C; 407F= r407F; 410= r410; 507=R507;CO2=
CO2; r32 = r32; r290 = r290; r448 = r448A; r449 = r449A, r450 = r450A, r513= r513; 1234
= r1234ze
6. Press “SET” to store the new value and move to the following parameter.
To exit: Press SET + UP or wait 30s without pressing a key.
NOTE: the set value is stored even when the procedure is exited by waiting thetime-out to expire.
7.2 How to set the range of the pressure probes
If an instrument with the following part number is used: XC645CX –xxxxF, it is pre-set to work
with pressure probe with the following range:
Probe 1: -0.5 ÷11.0 bar (relative pressure);
Probe 2: 0÷30.0 bar (relative pressure)
If the probes you’re using have a different range act as in the following:
To set the pressure range of the Probe 1 (suction probe) use the parameter:
PA04: Adjustment of read out corresponding to 4mA (0.5V)
PA20: Adjustment of read out corresponding to 20mA (4.5V)
Practically these parameters have to be set with the start and end scale of the probe range.
How to do:
1. Enter the Programming mode by pressing the Set and DOWN key for 3s.
2. Select the “Pr2” parameter. Then enter the password 3 2 1 0.
3. Select the PA04, adjustment of read out corresponding to 4mA (0.5V), parameter.
4. Press the “SET” key: the value of the parameter will start blinking.
5. Set the lower value of the probe range.
6. Push the SET key to confirm the value. The PA20: adjustment of read out corresponding
to 20mA (4.5V) parameter will be displayed.
7. Set the higher value of the range.

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8. Push the SET key to confirm the value. Next parameter will be displayed.
Do the same things for the Probe 2, FA04, FA20 parameters.
8. User interface
8.1 Displaying
UPPER DISPLAY
LOWER DISPLAY
ICONS
Suction temperature or
pressure
Discharge temperature or pressure
-Working loads
-Measurement unit
-Alarm or status Icons
8.2 Keyboard
SET (SET)
Standard visualization: to see or modify the set point. In programming mode it selects
a parameter or confirms an operation.
Alarm menu: By holding it pressed for 3s, the current alarm is erased.
o(UP).
In programming mode: it browses the parameter codes or increases the displayed
value.
With Hot key inserted: it starts the Hot key programming procedure.
To access the INFO menu: push and release it to access the INFO menu.
n(DOWN)
In programming mode: it browses the parameter codes or decreases the displayed
value.
Manual restart of loads: By holding it pressed for 3s, it switches on again loads
previous locked by a safety digital input alarm.
MAINTEINANCE/CLOCK: To display the loads running hours
By holding it pressed for 3s the Maintaining menu is entered
To enter the Alarm menu

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KEY COMBINATIONS
o+ nTo lock and unlock the keyboard.
SET + nTo enter the programming mode.
SET + oTo exit the programming mode.
8.3 Icons
LED
FUNCTION
MEANING
ON
Celsius degrees
ON
Fahrenheit degrees
bar
ON
bar displaying
PSI
ON
PSI displaying
kPa
ON
KPA displaying
ON
Digital scroll compressor (DGS) on
Flashing
DGS is waiting to start (1HZ) or digital input alarm for DGS (2Hz).
or DGS in maintenance status (2Hz).
ON
Load 2 on
Flashing
Load 2 is waiting to start (1HZ). or digital input alarm for Load 2 (2Hz).
or Load 2 in maintenance status (2Hz).
ON
Load 3 on
Flashing
Load 3 is waiting to start (1HZ). or digital input alarm for Load 3 (2Hz).
o Load 3 in maintenance status (2Hz).
ON
Load 4 on
Flashing
Load 4 is waiting to start (1HZ). or digital input alarm for Load 4 (2Hz).
o Load 4 in maintenance status (2Hz).
ON
Load 6 on
Flashing
Load 6 is waiting to start (1HZ). or digital input alarm for Load 6 (2Hz).
o Load 6 in maintenance status (2Hz).
ON
The valve of the Digital scroll compressor is energized
ON
The Maintenance menu has been entered
Flashing
One or more loads have been placed in maintenance status
LP
ON
Low pressure switch alarm
HP
ON
High pressure switch alarm
ON
Alarm is happening
ON
All the stored alarms have been seen.
Flashing
A new alarm has happened
9. How to see and modify the set point(s)
9.1 How to see the set point of compressors and/or fans
If the controller is managing both compressors and fans, both the set points are displayed in
sequence, otherwise only the set point of the enabled section will be displayed.
1) Push and release the SET key;
2) The Lower display will show the “SEtC” label, will the Upper display will show its value.
3) To see the fan set point, push again the SET key.
4) The Lower display will show the “SEtF” label, will the Upper display will show the fan set
point.
To exit: push the SET key or wait for 30 without pressing any keys.

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9.2 How to modify the set point of compressors and/or fans
******WARNING: before setting the target set points for the first time, check and, if
necessary, modify the type of freon (par. FtyP) and the default unit of measurement (par.
dEU) for compressors and fans **********
PRE-ACTION
1. Set the kind of freon by means of the FtyP parameter (see 7.1 How to set the kind of
gas)
2. Set the measurement unit (dEU par.).
3. Check and if necessary modify the set point limits (LSE and HSE par.).
PROCEDURE
1. Push the SET key for more than 2 seconds;
2. The Lower display will show the “SEtC” label, will the Upper display will show its value
flashing.
3. To change the Set value, push the o or nwithin 30s.
4. To memorize the new value and pass to the fan set point, push the SET key.
5. The Lower display will show the “SEtF” label, will the Upper display will show the fan set
point flashing.
6. To change its value, push the o or nwithin 30s.
To exit: push the SET key or wait for 30 without pressing any keys.
10. The INFO menu
The controller can display some information directly from the main menu.
The INFO menu is accessible by pushing and releasing the UP key:
Here below the list of the information that can be displayed:
NOTE: this information is displayed only if the related function is enabled
•P1t: temperature value of the P1 probe
•P1P: pressure value of the P1 probe
•P2t: temperature value of the P2 probe
•P2P: pressure value of the P2 probe (if P2 present)
•P3t: temperature value of the P3 probe (if P3 present)
•P3P: pressure value of the P3 probe (if P3 present)
•P4t: temperature value of the P4 probe (if P4 present)
•LInJ: status of the injection output (“On” – “OFF”)
This information is available only if one relay, oA2 ÷oA6 is set as “Lin”.
•SEtd: value of the Dynamic Set point.
This information is available only if the Dynamic set point function is enabled (par.
dSEP ≠nP)
•dStO: percentage of the PWM output driving the valve of the Digital Scroll
compressor.
•dSFr: value of temperature or pressure when the regulation filter of Digital Scroll
compressor is enabled (par. dFE=YES).
•The “regulation filter” function calculates the average value of the
pressure/temperature during a PWM cycle, and uses this value for the control
algorithm
•AO1 Percentage of the analog output 1 (4-20mA or 0-10V).
•This information is always available
•AO2: Percentage of the analog output 2 (4-20mA or 0-10V).

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•This information is always available
•SSC1: Supervising Set for circuit 1, if supervising system is sending the set point
to the controller
•SSC2: Supervising Set for circuit 2, if supervising system is sending the set point
to the controller
•SStF: Supervising Set for fan, if supervising system is sending the set point to
the controller
•SH: Superheat
EXIT: push the SET+UP keys together.
11. Parameters programming
11.1 How to enter the “Pr1” parameter list
To enter the “Pr1” parameter list, user accessible, operate as follows:
1. Hold pressed the SET and DOWN key for 3s.
2. The controller displays the name of the parameter in the Lower display, its value on the Upper
display.
3. Press the “SET” key: the value of the parameter will start blinking.
4. Use “UP” or “DOWN” to change the value.
5. Press “SET” to store the new value and move to the following parameter.
To exit: Press SET + UP or wait 30s without pressing a key.
NOTE: the set value is stored even when the procedure is exited by waiting thetime-out to expire.
11.2 How to enter in parameters list “Pr2”
The “Pr2” parameter list is protected by a security code (Password).
SECURITY CODE is 3210
To access parameters in “Pr2”:
1. Enter the “Pr1” level.
2. Select “Pr2” parameter and press the “SET” key.
3. The flashing value “0 ---” is displayed.
4. Use oor nto input the security code and confirm the figure by pressing “SET” key.
5. Repeat operations 2 and 3 for the other digits.
NOTE: each parameter in “Pr2” can be removed or put into “Pr1” (user level) by pressing “SET”
+ n. When a parameter is present also in “Pr1” decimal point of the lower display is on.
11.3 How to change parameter values
1. Enter the Programming mode.
2. Select the required parameter with oor n.
3. Press the “SET” key the value start blinking.
4. Use oor nto change its value.
5. Press “SET” to store the new value and move to the following parameter.
To exit: Press SET + UP or wait 15s without pressing a key.

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NOTE: the new programming is stored even when the procedure is exited by waiting the time-
out.
12. How to disabled an output
To disabled an output during a maintenance session means to exclude the output from the
regulation.
12.1 How to disabled an output during a maintenance session.
1. Push the MAINTENANCE/CLOCK ( )key for 3s.
2. The LED’s of the first output is switched on, the Lower display shows the “StA” label, while
the Upper display shows the “On” label if the first output is enabled, or the “oFF” label if
the output is disabled for a maintenance section.
With compressor with more steps all the LED’s linked to the compressor and the valves are
switched on..
3. Select the output by pressing the UP or DOWN key.
4. To modify the status of the output: push the SET key, the status of the output starts
flashing, then push the UP or DOWN to pass from “On” to “OFF” and vice versa.
5. Push the SET key to confirm the status and pass to the next output..
To exit: push the CLOCK key or wait 30 sec
12.2 Output disabled signaling.
If an output is disabled its led blinks (2 Hz)
12.3 Regulation with some outputs disabled.
If some outputs are disabled they don’t take part to the regulation, so the regulation goes on with
the other outputs.
13. Running hours of loads
13.1 How to display the running hours of a load.
The controller memorizes the running hours of each load.
To see how long a load has been working follow this procedure:
1. Press and release the “MAINTENANCE/CLOCK ( )” key.
2. The led of the first output is switched on, the Upper Display shows the “HUr” label, while
the Lower Display shows the shows the running hours of the first output.
3. To see the running hours of the following load press the UP key .
To exit: push the key or wait 30 sec
13.2 How to reset the running hours of a load.
1. Display the running hour according to the above procedure.

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2. Select the load by pressing the UP key.
3. Push the SET key (immediately on the lower display the rSt label is displayed).
4. Hold pushedthe key forsome seconds till the “rSt” label starts flashing and the lower display
shows zero.
To exit: push the CLOCK key or wait 30 sec
NOTE: if the SET key is released within 2s, the controller reverts to display the running hours of
the selected loads..
14. Alarm Menu
The controller memorizes the last 20 alarms happened, together with their duration..
To see the alarm codes see par. par. 18.4.
14.1 How to see the alarms
1. Push the Alarm key.
2. The last alarm happened is showed on the Upper display, while the lower display shows its
number.
3. Push again the okey and the other alarm are displayed starting from the most recent.
4. To see the alarm duration and push the SET key.
5. By pushing again the o or SET key the next alarm is displayed.
Alarms erasing.
1. Enter the Alarm Menu.
2. To erase the displayed alarm push the “SET” key till the “rSt” label will be displayed in the
Lower Display,
NOTE the running alarms cannot be erased..
3. To erase the whole Alarm Menu, hold pressed the “SET” key for 10s.
15. Keyboard locking
15.1 How to lock the keyboard
1. Keep the oand nkeys pressed together for more than 3 s the oand nkeys.
2. The “POF” message will be displayed and the keyboard is locked. At this point it is only
possible to view the set point or enter the HACCP menu.
15.2 To unlock the keyboard
Keep the oand nkeys pressed together for more than 3s till the “POn” flashing message
appears.

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16. Use of the programming “HOT KEY “
16.1 How to program a hot key from the instrument (UPLOAD)
1. Program one controller with the front keypad.
2. When the controller is ON, insert the “Hot key” and push okey; the "uPL" message
appears followed a by flashing “End”
3. Push “SET” key and the End will stop flashing.
4. Turn OFF the instrument remove the “Hot Key”, then turn it ON again.
NOTE: the “Err” message is displayed for failed programming. In this case push again okey if
you want to restart the upload again or remove the “Hot key” to abort the operation.
16.2 How to program an instrument using a hot key
(DOWNLOAD)
1. Turn OFF the instrument.
2. Insert a programmed “Hot Key” into the 5 PIN receptacle and then turn the Controller
ON.
3. Automatically the parameter list of the “Hot Key” is downloaded into the Controller memory,
the “doL” message is blinking followed a by flashing “End”.
4. After 10 seconds the instrument will restart working with the new parameters.
5. Remove the “Hot Key”..
NOTE the message “Err” is displayed 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.
The unit can UPLOAD or DOWNLOAD the parameter list from its own E2 internal memory to the
“Hot Key” and vice-versa.
17. List of parameters
17.1 Plant dimensioning and type of regulation.
The XC645CX is pre-set to drive a Digital Scroll compressor.
The relay 15-17 is set to manage the Digital compressor, while the TRIAC output 17-19 drives its
solenoid valve.
oA1 (term. 15-17), oA2 (term. 16-17), oA3 (term. 17-18), oA4 (term. 17-20), oA6 (term. 21-22)
outputs 2 3 4 6 configuration: by means of these parameters the plant can be dimensioned
according to the number and type of compressors and/or fans and the number of steps for each
one.
Each relay according to the configuration of the oA(i), where (i) = 1, 2, 3, 4, 5, 6 parameter can
work as:
-Not used: oA(i) = nu
-Compressor circuit1: oA(i) = cPr1,
-Digital compressor: oA1 = dGS
-Blocked bank for Digital Stream ®6D: oA(i) = 6dG
-Step: oAi = StP
-Fan: oAi = FAn
-Fan with inverter/ECI fan: oA(i) =InF
-Injection of cooling liquid: oAi = Lin
-Alarm: oAi = ALr
-Flood protection function: oA(i) = Liq
-Valve for hot gas injection in case of low superheat: oA(i) = HGi