Emerson Dixell XC645D Wiring diagram

XC645D
(v. 3.4)

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INDEX
1. BEFORE PROCEEDING 4
1.1 CHECK THE SW REL.OF THE XC645D 4
2. GENERAL WARNING 4
2.1 PLEASE READ BEFORE USING THIS MANUAL 4
2.2 SAFETY PRECAUTIONS 4
3. GENERAL DESCRIPTION 5
4. COMPONENTS RELATED TO THE XC645D 5
4.1 PP07, PP11, PP30 PP50: 4÷20MAPRESSURE TRANSDUCERS5
4.2 NP4-67: PIPE MOUNTING TEMPERATURE PROBE 5
5. WIRING & ELECTRICAL CONNECTIONS 6
5.1 GENERAL WARNINGS 6
5.2 WIRING CONNECTIONS 6
5.3 PROBES CONNECTION 7
5.4 SAFETY DIGITAL INPUTS AND PRESSURE SWITCHES 8
5.5 LOAD CONNECTIONS 8
6. MOUNTING & INSTALLATION 9
7. FIRST INSTALLATION 10
7.1 HOW TO SET THE KIND OF GAS 11
7.2 HOW TO SET THE RANGE OF THE PRESSURE PROBES 11
8. USER INTERFACE 12
8.1 DISPLAYING 12
8.2 KEYBOARD 12
8.3 ICONS 13
9. HOW TO SEE AND MODIFY THE SET POINT(S) 14
9.1 HOW TO SEE THE SET POINT OF COMPRESSORS AND/OR FANS 14
9.2 HOW TO MODIFY THE SET POINT OF COMPRESSORS AND/OR FANS 14
10. THE INFO MENU 14
11. PARAMETERS PROGRAMMING 15
11.1 HOW TO ENTER THE “PR1” PARAMETER LIST 15
11.2 HOW TO ENTER IN PARAMETERS LIST “PR2” 15
11.3 HOW TO CHANGE PARAMETER VALUES 16
12. HOW TO DISABLED AN OUTPUT 16
12.1 HOW TO DISABLED AN OUTPUT DURING A MAINTENANCE SESSION. 16

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12.2 OUTPUT DISABLED SIGNALING. 16
12.3 REGULATION WITH SOME OUTPUTS DISABLED. 16
13. RUNNING HOURS OF LOADS 17
13.1 HOW TO DISPLAY THE RUNNING HOURS OF A LOAD. 17
13.2 HOW TO RESET THE RUNNING HOURS OF A LOAD. 17
14. ALARM MENU 17
14.1 HOW TO SEE THE ALARMS 17
15. KEYBOARD LOCKING 18
15.1 HOW TO LOCK THE KEYBOARD 18
15.2 TO UNLOCK THE KEYBOARD18
16. USE OF THE PROGRAMMING “HOT KEY “ 18
16.1 HOW TO PROGRAM A HOT KEY FROM THE INSTRUMENT (UPLOAD) 18
16.2 HOW TO PROGRAM AN INSTRUMENT USING A HOT KEY (DOWNLOAD) 18
17. LIST OF PARAMETERS 18
17.1 PLANT DIMENSIONING AND TYPE OF REGULATION. 18
17.2 PROBES CONFIGURATION 21
17.3 CONFIGURABLE DIGITAL INPUTS CONFIGURATION 22
17.4 DISPLAY AND MEASUREMENT UNIT 23
17.5 COMPRESSOR REGULATION 24
17.6 LIQUID INJECTION THERMOSTAT 25
17.7 FANS REGULATION 25
17.8 ALARMS –COMPRESSOR SECTION 26
17.9 ALARMS –DLT SECTION 26
17.10 ALARMS –FANS SECTION 27
17.11 DYNAMIC SET POINT FOR FAN 27
17.12 ANALOG OUTPUT (OPTIONAL) 28
17.13 OTHER 29
18. TYPE OF REGULATION 29
18.1 DIGITAL COMPRESSOR REGULATION 29
18.2 PROPORTIONAL BAND REGULATION -ONLY FOR FANS 32
18.3 CONDENSERWITH INVERTER OR ECI FANS–ANALOG OUTPUT SETTING 34
19. ALARM LIST 34
19.1 TYPES OF ALARMS AND SIGNALING MANAGED 39
19.2 BUZZER MUTING 42
19.3 ALARM CONDITIONS –SUMMARY TABLE 42
20. TECHNICAL FEATURES 45
21. PARAMETERS –DEFAULT VALUES 45

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1. BEFORE PROCEEDING
1.1 Check the sw rel. of the XC645D
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.

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3. General description
The XC645D is designed to manage both compressors and fans in a condensing system such as
a pack.
The compressors can be digital scroll or Stream, simple, multistage.
Control is by means of a neutral zone and is based on the pressure or temperature sensed in the
LP suction (compressors) and HP (condenser) circuits. Aspecial algorithm balancesthe runhours
of the compressors to distribute the work load uniformly.
The controllers can convert both LP and HP 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
RS485 serial output, using the standard ModBus RTU protocol.
4. COMPONENTS RELATED TO THE XC645D
Name
Description
Part number
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 PP07, PP11, PP30 PP50: 4÷20mA pressure transducers
PP07 2,0MT -0,5+7 bar rel FE cod BE009302 00
PP11 2,0MT -0,5+7 bar rel FE cod BE009302 07
PP30 2,0MT 0+30 bar rel FE cod BE009302 04
PP50 2,0MT 0+50 bar rel FE cod BE009002 05
4.2 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

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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 5A resistive, in case of heavier
loads use a suitable external relay.
5.2 Wiring connections
NOTE
120V version: use terminals 47-48 for power supply: Terminals 44-45-46 operate at 120V
90-260V version: use terminals 47-48 for power supply: Terminals 44-45-46 operate at the same
voltage
24V version: use terminals 47-48 for power supply; Short circuit terminal 1-2.

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5.3 Remote keyboard connection –Only for XC645D -7x0xx- or
XC645D -7x2xx-
**** ONLY FOR THE MODELS WITH 90-260Vac POWER SUPPLY
IDENTIFIED BY THE FOLLOWING PART NUMBERS: XC645D -7x0xx- or
XC645D -7x2xx-****
The VC660, remote keyboard for XC600D series, can be connected only to
the models with the above part numbers.
Use shielded 2 wires cable AWG 20, max allowed distance between
controller and keyboard: 30m.
Respect the polarity indications: as for the following table
XC645D -7x0xx- or XC645D -7x2xx-
VC660
Terminal:29 (+)
Terminal: 1 (+)
Terminal:30 (-)
Terminal: 3 (-)
5.4 Probes connection
5.4.1 General warnings
Pressure probe (4 - 20mA): 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.
5.4.2 Probe wirings
Low voltage side: Keep the cables away from the power cables. Use shielded cable to lengthen the
cables.
NOTE1: The PIN 38 is the common line for the temperature probes
NOTE2: The PIN 37 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 37; white (-) to terminal 40
Condenser (P2C = Cur)
Brown (+) to terminal 37; white (-) to terminal 41
Temperature probes (NTC 10K)
Suction: 38-40 (P1C = NTC)
Condenser: 38-41 (P2C =NTC)
Pb3 (P3C = NTC): 38-42
Pb4 (P4C = NTC): 38-42
Ratiometric transducers (0.5÷4.5Vdc)
Suction (P1C = 0-5)
40 (In); 38(+); 39 (gnd)
Condenser (P2C =0-5)
41 (In); 38(+); 39 (gnd)

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5.5 LOAD CONNECTIONS
!!!WARNING: Digital Scroll valve coil can operate at main voltage (230Vac or 115Vac) or
24Vac. In case of 24Vac short circuit terminals 1-2.
5.5.1 Connections for models at 230V or 115V and coil of digital valve at
115 or 230V.
5.5.2 Connections for models at 230V or 115V or 24V and coil of digital
valve at 24V.
5.6 SAFETY AND CONFIGURABLE DIGITAL INPUTS –FREE
VOLTAGE
5.6.1 Load safety inputs
Controller has 7 configurable digital inputs, free voltage.
Each digital input can be set by the related parameter iF01,.. iF07.
The first 4 digital inputs are factory pre-set to operate as safety input for loads.
Each input must 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

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LOAD
TERM.
SAFETY
INPUT
TERMINALS
SETTING
CONNECTION
Load 1
(digital)
5-6
Di1
13-14
iF01 = oA1
Load 2
7-8
Di2
13-15
iF02 = oA2
Load 3
9-10
Di3
16-17
iF03 = oA3
Load 4
11-12
Di4
16-18
iF04 = oA4
5.6.2 Additional Configurable digital inputs.
The controller XC645D is provided with 3 additional configurable digital inputs, one of them can
operate also as probe. Their functions are set by the parameter iF05, iF07 and iF08 respectively.
They can be used for liquid level monitoring, activate the energy saving function or silence mode
from a external devices.
The digital input connection is explain in the following table
Digital input
TERMINALS
Related parameter
CONNECTION
Digital input 5
19-20
iF05: function
iP05: polarity
First configurable
input/Probe 4
22-23 (i1F/Pb4)
iF07: function
iP07: polarity
Second
configurable d.i.
22-24 (i2F)
iF08: function
iP08: polarity
5.7 HP –LP Pressure switches connection
!!!WARNING: controller is provided with both free voltage digital inputs, and main voltage
inputs.!!!!
The main voltage inputs are designed for HP and LP pressure switches.
The low pressure switch has to be connected to the terminal 44 (line)and 45 (common)
The high pressure switch has to be connected to the terminal 45 (common) and 46 (line)
as shown on the following wiring diagram.
NOTE: the main voltage is related to the voltage supply of
the controllers.
Models at 115V or 230V the inputs operate at 115 or 230V.
Models at 24V the inputs operate at 24V.
5.8 Analog output connection
The controller supply up to 2 analog outputs, terminals, kind of output and functionality are shown
in the following table

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Terminals
Related parameter
Analog output 1
25[+] –26[-].
AOC: Kind of signal (4-20mA/0-10V)
AOF: function
Analog output 2
27[+] –28[-].
2AOC: Kind of signal (4-20mA/0-10V)
2AOF: function
5.9 How to connect monitoring system - RS485 Serial line
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).
1) Terminals [31] [+] and [32] [-].
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.
6. Mounting & installation
The instruments are suitable only for internal use.
Instrument XC645D shall be mounted on an omega DIN rail
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.
6.1 VC660 –KEYBOARD INSTALLATION
56
72
40
83,5
Keyboard VC660 shall be mounted on vertical panel,
in a 72x56 mm hole, and fixed using screws 3 x
2mm. To obtain an IP65 protection grade use the front
panel rubber gasket (mod. RGW-V).