Emerson EC2-XC645CX Wiring diagram

÷÷
EC2-XC645CX
(v. 3.5)

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INDEX
BEFORE PROCEEDING 5
1.1 CHECK THE SW REL.OF THE EC2-XC645CX 5
GENERAL WARNING 5
2.1 PLEASE READ BEFORE USING THIS MANUAL 5
2.2 SAFETY PRECAUTIONS 5
GENERAL DESCRIPTION 6
COMPONENTS RELATED TO THE EC2-XC645CX 6
4.1 CWC15KIT AND CWC30KIT: WIRING KITS 6
4.2 CABCJ15 OR CABCJ30: 2PIN CONNECTORS 7
4.3 PT5N: 4÷20 MAPRESSURE TRANSDUCERS AND CABLE ASSEMBLIES 7
4.4 DISCHARGE TEMPERATURE OF DIGITAL SCROLL 7
4.5 XJ485CX: TTL /RS485 SERIAL CONVERTER 7
WIRING & ELECTRICAL CONNECTIONS 8
5.1 GENERAL WARNINGS 8
5.2 WIRING CONNECTIONS 8
5.3 PROBE 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
MOUNTING & INSTALLATION 12
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
USER INTERFACE 14
8.1 DISPLAYING 14
8.2 KEYBOARD 14
8.3 ICONS 15
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
THE INFO MENUE 16

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PARAMETER PROGRAMMING 17
11.1 HOW TO ENTER THE “PR1” PARAMETER LIST 17
11.2 HOW TO ENTER IN PARAMETER LIST “PR2” 17
11.3 HOW TO CHANGE PARAMETER VALUES 17
HOW TO DISABLE AN OUTPUT 18
12.1 HOW TO DISABLE AN OUTPUT DURING A MAINTENANCE SESSION. 18
12.2 OUTPUT DISABLED SIGNALING. 18
12.3 REGULATION WITH SOME OUTPUTS DISABLED. 18
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
ALARM MENUE 19
14.1 HOW TO SEE THE ALARMS 19
KEYBOARD LOCKING 19
15.1 HOW TO LOCK THE KEYBOARD 19
15.2 TO UNLOCK THE KEYBOARD 19
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
LIST OF PARAMETERS 20
17.1 PLANT DIMENSIONING AND TYPE OF REGULATION. 20
17.2 PROBE CONFIGURATION 23
17.3 OTHER INPUT 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 28
17.9 ALARMS –DLT SECTION 28
17.10 ALARMS –FANS SECTION 28
17.11 SUCTION SUPERHEAT 29
17.12 DYNAMIC SET POINT FOR FAN 30
17.13 ANALOG OUTPUTS (OPTIONAL)-TERMINALS 23-34 30
17.14 ANALOG OUTPUT 2(OPTIONAL)–TERMINALS 8-10 31
17.15 OTHER 31
TYPE OF REGULATION 32
18.1 DIGITAL COMPRESSOR 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
ADDITIONAL FUNCTIONS 39
19.1 COMPRESSOR RUNNING PROOF FUNCTION 39
19.2 FLOOD PROTECTION FUNCTION 40

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19.3 SUCTION SUPERHEAT MONITORING 41
19.4 HOT GAS INJECTION VALVE 42
ALARM LIST 42
20.1 TYPES OF ALARMS AND SIGNALING MANAGED 42
20.2 BUZZER MUTING 45
20.3 ALARM CONDITIONS –SUMMARY TABLE 45
TECHNICAL FEATURES 48
PARAMETERS – DEFAULT VALUES 49

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BEFORE PROCEEDING
1.1 Check the sw rel. of the EC2-XC645CX
1. Look at the SW rel. of XC64D printed on the label of the controller.
2. If the SW release is 3.5, proceed with this manual otherwise contact Emerson to get
the right manual.
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.
•Emerson 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
condensations.
•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
“Emerson.” (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.

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GENERAL DESCRIPTION
The EC2-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.
It’s possible to manage suction circuit and condenser.
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 workload uniformly.
The controllers can convert both suction and discharge pressure 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.
COMPONENTS RELATED TO THE EC2-XC645CX
Name Description Part No.
Transformer
ECT-323 230 V/24 VAC 804424
Wiring kit 1.5 m and 3 m
CWC30-Kit (3.0 m) 807724
Female disconnect able connector for digital
input or analog output (4 pcs)
CABCJ30 (3.0 m) 807723
TTL / RS485 serial converter
XJ485CX+CABRS02
J7MAZZZ9AA
4-20 mA suction pressure transducer
PT5N-07M (-0.8+7 bar)
805350
4-20 mA condenser pressure transducer
PT5N-30M (0+30 bar)
805352
Cable Assembly for PT5N 3 m
PT4-M30
804804
4.1 CWC15KIT and CWC30KIT: wiring kits
The EC2-XC645CX is provided with 2 socket
connectors with 14 and 6 pins.
For the wiring, the CWC15KIT (1.5 m cable
length) or CWC30KIT (3.0 m cable length) have
to be used.

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4.2 CABCJ15 or CABCJ30: 2 PIN connectors
NOTE:
Use the connection cable CABCJ15 (1.5 m
length)or the CABCJ30 (3.0 m length) for the:
- HP digital input (25-26),
- i2F configurable digital input (27-28),
- 0-10Vdc or 4-20mA analogue output
(23-24)
- oA6, 12 VD/4 0mA digital output (21-22)
4.3 PT5N: 4÷20 mA pressure transducers and cable assemblies
Name Range Part No. Name Length Part No.
PT5N-07M / T
-0.8+7 bar (g)
805350 / 805380
PT4-M15
1.5 m
804803
PT5N-18M / T
0+18 bar (g)
805351 / 805381
PT4-M30
3 m
804804
PT5N-30M / T
0+30 bar (g)
805352 / 805382
PT4-M60
6 m
804805
PT5N-50M / T
0+50 bar (g)
805353 / 805383
4.4 Discharge temperature of Digital Scroll
The discharge temperature probe NTC-86k type supplied with Copeland Digital scroll should be
used.
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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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
•Always use a class 2 transformer with minimum power 5 VA such as TF5.
•Terminals [21-22], [23-24], [25-26], [27-28] are provided with JST 2 PINS connectors, they
require the CABCJ15 (1.5 m) or CABCJ30 (3 m) wiring cables.
ALL LOADS AT 24 VAC

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5.3 Probe connection
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.
Probe wirings
Low voltage side (14 PINs 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 4-20 mA pressure transducers.
PP07 PP11, PP30, PP50 4 - 20 mA 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
Temperature probes (NTC 10 K)
Suction: 4 - 5 (P1C = NTC)
Condenser: 4 - 7 (P2C = NTC)
Pb3: (P3C = NTC): 4 - 3
Pb4: (P4C = Nt10) 27 - 28
Ratiometric transducers (0.5 - 4.5 VDC)
Suction (P1C = 0-5)
5 (In); 4(+); 10 (gnd)
Condenser (P2C = 0-5)
7 (In); 4(+); 10 (gnd)

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5.4 Load connections
!!!WARNING: Digital Scroll valve coil MUST operate at main voltage (24 VAC)!!
NOTE: Main voltage side (6 PINs 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
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 related to 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
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:
PRESSURE SWITCH INPUT TERMINALS SETTING
LP
Di5
10-9
iF05 = LP1
HP*
Di6
25-26
iF06 = HP
Note: *) 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.
24VAC