dixell XC660D Wiring diagram

XC660D
(v. 3.4)

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INDEX
1. BEFORE PROCEEDING 5
1.1 CHECK THE SW REL.OF THE XC660D 5
2. GENERAL WARNING 5
2.1 PLEASE READ BEFORE USING THIS MANUAL 5
2.2 SAFETY PRECAUTIONS 5
3. GENERAL DESCRIPTION 6
4. PROBES RELATED TO THE XC660D 6
4.1 PP07, PP11, PP30 PP50: 4÷20MAPRESSURE TRANSDUCERS6
4.2 NP4-67: PIPE MOUNTING TEMPERATURE PROBE 6
5. WIRING & ELECTRICAL CONNECTIONS 7
5.1 GENERAL WARNINGS 7
5.2 WIRING CONNECTIONS 7
5.3 REMOTE KEYBOARD CONNECTION –ONLY FOR XC660D -7X0XX-OR XC660D -7X2XX- 8
5.4 PROBES CONNECTION 8
5.5 LOAD CONNECTIONS 9
5.6 SAFETY AND CONFIGURABLE DIGITAL INPUTS –FREE VOLTAGE 9
5.7 CIRCUIT WITH 1SUCTION AND 1CONDENSER: HP –LP PRESSURE SWITCH CONNECTIONS
10
5.8 CIRCUIT WITH 2SUCTIONS AND 1CONDENSER: HP –LP PRESSURE SWITCH
CONNECTIONS 10
5.9 ANALOG OUTPUT CONNECTION 11
5.10 HOW TO CONNECT MONITORING SYSTEM -RS485 SERIAL LINE 11
6. MOUNTING & INSTALLATION 11
6.1 VC660 –KEYBOARD INSTALLATION 11
7. FIRST INSTALLATION 12
7.1 HOW TO SET THE KIND OF GAS 12
7.2 HOW TO SET THE RANGE OF THE PRESSURE PROBES 12
8. USER INTERFACE 13
8.1 DISPLAYING 13
8.2 KEYBOARD 13
8.3 ICONS 14
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 15
10. THE INFO MENU 15

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11. PARAMETERS PROGRAMMING 16
11.1 HOW TO ENTER THE “PR1” PARAMETER LIST 16
11.2 HOW TO ENTER IN PARAMETERS LIST “PR2” 16
11.3 HOW TO CHANGE PARAMETER VALUES 17
12. HOW TO DISABLED AN OUTPUT 17
12.1 HOW TO DISABLED AN OUTPUT DURING A MAINTENANCE SESSION. 17
12.2 OUTPUT DISABLED SIGNALING. 17
12.3 REGULATION WITH SOME OUTPUTS DISABLED. 17
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 18
14.1 HOW TO SEE THE ALARMS 18
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 “ 19
16.1 HOW TO PROGRAM A HOT KEY FROM THE INSTRUMENT (UPLOAD) 19
16.2 HOW TO PROGRAM AN INSTRUMENT USING A HOT KEY (DOWNLOAD) 19
17. LIST OF PARAMETERS 20
17.1 PLANT DIMENSIONING AND TYPE OF REGULATION. 20
17.2 PROBES CONFIGURATION 24
17.3 CONFIGURABLE DIGITAL INPUTS CONFIGURATION 25
17.4 DISPLAY AND MEASUREMENT UNIT 27
17.5 COMPRESSOR REGULATION 27
17.6 LIQUID INJECTION THERMOSTAT –ONLY SCREW COMPRESSORS 28
17.7 FANS REGULATION 29
17.8 ALARMS –COMPRESSOR SECTION 29
17.9 ALARMS –FANS SECTION 30
17.10 SUCTION SUPERHEAT OF CIRCUIT 1 30
17.11 DYNAMIC SET POINT FOR FAN 31
17.12 ANALOG OUTPUT 1(OPTIONAL)–TERMINALS 25-26 32
17.13 ANALOG OUTPUT 2(OPTIONAL)–TERMINALS 27-28 32
17.14 OTHER 33
18. EVEN CAPACITY COMPRESSORS (CTYP = SPO) 34
18.1 COMPRESSORS WITH SAME CAPACITY –DEAD BAND CONTROL 34
19. UNEVEN CAPACITY COMPRESSORS (CTYP = DPO) 35
20. SCREW COMPRESSORS (CTYP = SCR) 35
20.1 REGULATION WITH SCREW COMPRESSORS LIKE BITZER/HANBELL/REFCOMP ETC 36
21. FAN REGULATION 36

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21.1 CONDENSER WITH INVERTER OR ECI FANS–ANALOG OUTPUT SETTING 37
21.2 ANALOG OUTPUT “FREE”38
22. ADDITIONAL FUNCTIONS 40
22.1 COMPRESSOR RUNNING PROOF FUNCTION 40
22.2 FLOOD PROTECTION FUNCTION 41
22.3 SUCTION SUPERHEAT MONITORING 42
22.4 HOT GAS INJECTION VALVE 43
23. ALARM LIST 43
23.1 TYPES OF ALARMS AND SIGNALING MANAGED 43
23.2 BUZZER MUTING 47
23.3 ALARM CONDITIONS –SUMMARY TABLE 47
24. TECHNICAL FEATURES 50
25. PARAMETERS –DEFAULT VALUES 50

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1. BEFORE PROCEEDING
1.1 Check the sw rel. of the XC660D
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 XC660D is designed to manage both compressors and fans in a condensing system such as
a pack. The compressors can be scroll or Stream, simple or multistage.
It’s possible to manage up to 2 suction circuits with a common condenser.
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.A specialalgorithm balancestherun hours
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. PROBES RELATED TO THE XC660D
4.1 PP07, PP11, PP30 PP50: 4÷20mA pressure transducers
NAME
CABLE LENGTH
RANGE
DIXELL CODE
PP07
2,0MT
-0,5+7bar rel FE
BE009302 00
PP11
2,0MT
-0,5+7bar rel FE
BE009302 07
PP30
2,0MT
0+30 bar rel FE
BE009302 04
PP50
2,0MT
0+50 bar rel FE
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
24V version: use terminals 47-48 for power supply;
90-260V version: use terminals 47-48 for power supply: Terminals 44-45-46 operate at the same
voltage

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5.3 Remote keyboard connection –Only for XC660D -7x0xx- or
XC660D -7x2xx-
**** ONLY FOR THE MODELS WITH 90-260Vac POWER SUPPLY
IDENTIFIED BY THE FOLLOWING PART NUMBERS: XC660D -7x0xx- or
XC660D -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
XC660D -7x0xx- or XC660D -7x2xx-
VC660
Terminal:29 (+)
Terminal: 1 (+)
Terminal:30 (-)
Terminal: 3 (-)
5.4 Probes connection
5.4.1 General warnings
Pressure probe (4 - 20mAor ratiometric): 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 1 (P1C = Cur)
Brown (+) to terminal 37; white (-) to terminal 40
Condenser (P2C = Cur)
Brown (+) to terminal 37; white (-) to terminal 41
Suction 2 - optional (P3C = Cur)
Brown (+) to terminal 37; white (-) to terminal 42
Temperature probes (NTC 10K)
Suction: 38-40 (P1C = NTC)
Condenser: 38-41 (P2C =NTC)
Suction 2 - optional (P3C = NTC): 38-42
Pb4 (P4C = NTC): 38-42

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Ratiometric transducers (0.5÷4.5Vdc)
Suction 1 (P1C = 0-5)
40 (In); 38(+); 39 (gnd)
Condenser (P2C =0-5)
41 (In); 38(+); 39 (gnd)
Suction 2 - optional (P3C = 0-5)
42 (In); 38(+); 39 (gnd)
5.5 LOAD CONNECTIONS
The XC660D is provided with 6
relay, as shown on the picture.
The relay functionality depends on
the setting of the parameters
oA1÷oA6.
According to the features of the
loads, suitable external contactors
have to be used to supply the
loads properly.
5.6 SAFETY AND CONFIGURABLE DIGITAL INPUTS –FREE
VOLTAGE
5.6.1 Loads safety inputs
Controller has 8 configurable digital inputs, free voltage.
Each digital input can be set by the related parameter iF01,.. iF08.
The first 6 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
LOAD
TERM.
SAFETY
INPUT
TERM.
SETTING
CONNECTION
Load 1
1-2
Di1
13-14
iF01 = oA1
Load 2
3-4
Di2
13-15
iF02 = oA2
Load 3
5-6
Di3
16-17
iF03 = oA3
Load 4
7-8
Di4
16-18
iF04 = oA4
Load 5
9-10
Di5
16-18
iF05 = oA5
Load 6
11-12
Di6
16-18
iF06 = oA6
5.6.2 Configurable digital inputs.
The controller XC660D is provided with 2 additional configurable digital inputs, the first one can
operate also as probe.

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Their functions are set by the parameter 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
DI7 configurable
input/Probe 4
22-23 (i1F/Pb4)
iF07: function
iP07: polarity
DI8 configurable
d.i.
22-24 (i2F)
iF08: function
iP08: polarity
5.7 Circuit with 1 SUCTION and 1 CONDENSER: HP –LP
Pressure switch connections
!!!WARNING: controller is provided with both free voltage digital inputs, and main voltage
inputs.!!!!
NOTE: The main voltage inputs are designed only for HP and LP pressure switches.
The low pressure switch has to be connected to the terminal 45 (common) and 46 (line)
The high pressure switch has to be connected to the terminal 45 (common) and 44 (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 Circuit with 2 SUCTIONS and 1 CONDENSER: HP –LP
Pressure switch connections
In case of racks with 2 suction circuits and 1 condenser the LP1, low pressure switch, and HP
high pressure switch, must be connected to the terminals 44-45 and 45-46 as explained in 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.
5.8.1 Suction 2: connection of the Low Pressure switch,
The LP2 low pressure switch of circuit 2, must be a free of voltage signal.
To manage it, set:
i8F = LP2 and then connect it to the terminals 22-24.