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.