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).

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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 kind of gas is set by the parameter FtyP.
The controller has memorized the relation between temperature and pressure for some gases.
The pre-set gas is: r404A. (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
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 the time-out to expire.
7.2 How to set the range of the pressure probes
If an instrument with the following part number is used: XC645D –xxxxF, it is pre-set to work with
pressure probe with the following range:
Suction Probe : -0.5 ÷11.0 bar (relative pressure);
Discharge Probe : 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)
To set the pressure range of the Probe 2 (Condenser probe) use the parameter:
FA04: Adjustment of read out corresponding to 4mA (0.5V)
FA20: 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.

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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.
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)

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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
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
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
ON
Energy saving activated

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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.
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 refrigerant gas (par. FtyP) and the default unit of
measurement (par. dEU) for compressors and fans **********
PRE-ACTION
1. Set the kind of refrigerant 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)

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•LInJ: status of the injection output (“On” – “OFF”), This information is available
only if one relay, oA2 ÷oA4 is set as “Lin”.
•SEtd: value of the Dynamic Set point.
This information is available only ifthe 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 ofthe pressure/temperature duringa 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).
•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 theset point tothe
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 the time-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.

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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.
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.

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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.
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 for some 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. 0.
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.

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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.
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 Controllermemory,
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 XC645D is pre-set to drive a Digital Scroll compressor.
The relay oA1 (term. 5-6), is set tomanage the DigitalScroll compressor, while the TRIAC output
1-3 drives its solenoid valve.

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oA2 (term. 7-8), oA3 (term. 9-10), oA4 (term. 11-12), outputs 2 3 4 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, parameter can
work as:
-Not used: oA(i) = nu
-Compressor circuit1: oA(i) = cPr1,
-Step: oA(i) = StP
-Digital Scroll or Stream: oA(i) = dGS
-Blocked suction valve of Stream 6D: oA(i) = 6dG
-Fan: oA(i) =FAn
-Fan with inverter/ECI fan: oA(i) =InF
-Alarm: oA(i) = ALr
-Injection of cooling liquid: oA(i) = Lin
-Flood protection function: oA(i) = Liq
-Valve for hot gas injection in case of low superheat: oA(i) = HGi
NOTE: also the “cPr2”, “InC1”, “InC2”, “dGst” ” values are present. These values must not
be used..
According to the oA1, oA2, oA3, oA4 configuration, 2 kinds of plant can be defined:
Rack with compressors only: all the oAi different from FAn
Rack with compressors and fans: both FAn and CPr are used for oAi.
NOTE: COMPRESSOR WITH STEPS CONFIGURATION: the output of compressor has to be
set before the output of the step.
ES. Compressor with 1 step: oA2 = cPr, oA3= StP.
If an oA(i) set as step without any previous oAi set as cPr the configuration alarm “CStP”
will be activated.
PLANT CONFIGURATION EXEMPLES:
Plant with 2 compressors
(one of them digital) e 2 fans
default configuration with
PP11, PP30 pressure
transducers:
oA1 = dGS,
oA2 = CPr,
oA3 = FAn,
oA4 = FAn,
dGty = SCrL
Plant with 4 compressors
without fans:
oA1 = dGS,
oA2 = CPr,
oA3 = CPr,
oA4 = CPr,
dGty = SCrL

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Plant with 4 compressors
with inverter for fans:
oA1 = dGS,
oA2 = CPr,
oA3 = CPr,
oA4 = CPr,
dGty = SCrL
AOC = tEn
AOF = InF
dGty Kind of digital compressor
SCrL = Digital Scroll: the range of capacity modulation starts from 10% to 100%
StrM = Digital Stream: the range of capacity modulation starts from 0% to 100%
StP Valve outputs (unloader) polarity: polarity of the outputs for capacity valves. It
determines the status of the relays associated with the capacity valves (only for
homogeneous and stepped-capacity compressors)
oP=valve activated with open contacts of the relay;
cL= valve activated with close contacts of the relay.
FtyP: Refrigerant type: set the kind of gas refrigerant used in the plant:
LABEL
REFRIGERANT
OPERATING RANGE
R22
r22
-50-60°C/-58÷120°F
r134
r134A
-70-60°C/-94÷120°F
r404A
r404A
-50-60°C/-58÷120°F
r407A
r407A
-50-60°C/-58÷120°F
r407C
r407C
-50-60°C/-58÷120°F
r407F
r407F
-50-60°C/-58÷120°F
r410
r410
-50-60°C/-58÷120°F
r507
r507
-70-60°C/-94÷120°F
CO2
r744 - Co2
-50-30°C/-58÷86°F
r32
r32
-70-60°C/-94÷120°F
r290
r290 –Propane
-50-60°C/-58÷120°F
r448
r448A
-45-60°C/-69÷120°F
r449
r449A
-45-60°C/-69÷120°F
r450
r450A
-45-60°C/-69÷120°F
r513
r513
-45-60°C/-69÷120°F
1234
r1234ze
-18÷50°C/0÷122°F
Sty Compressors rotation enabling
YES = rotation enabled : this algorithm distributes the working time between the various
compressors to ensure even run times.
no = fixed sequence: thecompressors are enabled and disabledin fixed sequence: first,
second etc.