Emerson Dixell XC645D Installing And Operating Instructions

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÷20MA PRESSURE TRANSDUCERS 5

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 KEYBOARD 18

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 CONDENSER WITH 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. A special algorithm balances the run 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. 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

7

2

40

8

3

,

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 + n To enter the programming mode.
SET + o To 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 n within 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 n within 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 if the 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 of the pressure/temperature during a 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 the set point to the
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 o or n to 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 o or n.

3. Press the “SET” key the value start blinking.

4. Use o or n to 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 pushed the 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 o key 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 o and n keys pressed together for more than 3 s the o and n keys.

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 o and n keys 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 o key; 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 o key 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 Controller memory,

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 to manage the Digital Scroll 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: the compressors are enabled and disabled in fixed sequence: first,

second etc.

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NOTE: The digital scroll compressor is always started as first and switched off as last.

In any case, if it is locked because of safety timers, it can be started to maintain the

pressure in the regulation band. See par. dGSP
rot Fan rotation enabling
YES = rotation enabled: this algorithm distributes the working time between the various

fans to ensure even run times.
no = fixed sequence: the fans are enabled and disabled in fixed sequence: first, second

etc.

17.2 Probes configuration

Probes can be used in different ways according to plant features, as described in the following
table:

17.2.1 Suction probe configuration

P1c: Suction probe setting (probe 1):

nP = not used: don’t set it;

Cur = 4 ÷ 20 mA pressure transducer; use term. 37(+), 40 (in); 39 (gnd) if present

tEn = 0.5÷4.5V ratiometric pressure transducer; use term. 38(+), 40 (in); 39 (gnd)

ntc = NTC 10K probe; use term. 38-40
PA04: Adjustment of read out for the Probe 1 (used only if P1c=Cur or tEn). Corresponding

to 4mA or 0.5V input signal, given by the suction probe (-1.0 ÷ PA20bar; -15÷PA20PSI;

-100 ÷ PA20KPA)

E.I. PP11 relative pressure transducer, range -0.5÷11.0 bar. PA04=-0.5; PA20=11.0
PP30 relative pressure transducer, range: 0÷30bar. PA04=0.0; PA20=30.0.
PA20: Adjustment of read out for the Probe 1 corresponding to 20mA or 4.5V input signal,

given by the suction probe (PA04 ÷ 61.0BAR; PA04 ÷ 885PSI; PA04 ÷ 6100KPA).
CAL: Probe 1 calibration: the range depends on the dEU parameter:

dEU=bar or °C: -12.0÷12.0;

dEU=PSI or °F: -200÷200;

dEU=kPA: -999÷999;

17.2.2 Condenser probe configuration

P2c: Condenser probe setting (probe 2):

nP = not used:

Cur = 4 ÷ 20 mA pressure transducer; use term. 37(+), 41 (in); 39 (gnd) if present

tEn = 0.5÷4.5V ratiometric pressure transducer; use term. 38(+), 41 (in); 39 (gnd)

ntc = NTC 10K probe; use term. 38- 41
FA04: Adjustment of read out for the Probe 2 (used only if P2c=Cur or tEn). corresponding

to 4mA or 0.5V input signal, given by the delivery probe

(-1.0 ÷ FA20bar; -15÷FA20PSI; -100 ÷ FA20KPA)
FA20: Adjustment of read out for the Probe 2 corresponding to 20mA or 4.5V input signal,

given by the condensing probe (PA04 ÷ 61.0BAR; PA04 ÷ 885PSI; PA04 ÷ 6100KPA)
FCAL: Probe 2 calibration the range depends on the dEU parameter:

dEU=bar or °C: -12.0÷12.0;

dEU=PSI or °F: -200÷200;

dEU=kPA: -999÷999;

17.2.3 Probe 3 configuration

P3c: Probe 3 setting:

nP = not used:

Cur = 4 ÷ 20 mA pressure transducer; use term. 37(+), 42 (in); 39 (gnd) if present

tEn = 0.5÷4.5V ratiometric pressure transducer; use term. 38(+), 42 (in); 39 (gnd)

nt10 = NTC 10K 38-42

nt86 = NTC 86K 38-42

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3P04: Adjustment of read out for the Probe 3 (used only if P3c=Cur or tEn). corresponding

to 4mA or 0.5V input signal, given by the delivery probe

(-1.0 ÷ FA20bar; -15÷FA20PSI; -100 ÷ FA20KPA)
3P20: Adjustment of read out for the Probe 3 corresponding to 20mA or 4.5V input signal,

given by the condensing probe (PA04 ÷ 61.0BAR; PA04 ÷ 885PSI; PA04 ÷ 6100KPA)
O3: Probe 3 calibration the range depends on the dEU parameter:

dEU=bar or °C: -12.0÷12.0;

dEU=PSI or °F: -200÷200;

dEU=kPA: -999÷999;

17.2.4 Probe 4 configuration

P4c: Probe 4 setting (22-23):

nP = not used:

nt10 = NTC 10K 38-42

nt86 = NTC 86K 38-42
O4: Probe 4 calibration the range depends on the dEU parameter:

dEU= °C: -12.0÷12.0;

dEU= °F: -200÷200;

17.2.5 Probe selection for fan

FPb: Probe selection for condenser fan

nP = not used:

P1 = Probe 1

P2 = Probe 2

P3 = Probe 3

17.3 Configurable digital inputs configuration

iF01 Digital input 1 configuration (13-14)

nu = Not used: the digital input is disabled.

oA1= Safety digital input for load 1, term. 5-6; (Factory setting);

oA2 = Safety digital input for load 2, term. 7-8

oA3 = Safety digital input for load 3, term. 9-10

oA4 = Safety digital input for load 4, term. 11-12

inF = Safety digital input of inverter for fan, used when none relay is configured as inverter

for fans

ES = Energy saving;

oFF = instrument shut down;

LL = liquid level alarm

SIL = to enable the silence function

EAL = generic external alarm, it doesn’t affect the regulation

Co1 = running proof function for load 1, term. 5-6

Co2 = running proof function for load 2, term. 7-8

Co3 = running proof function for load 3, term. 9-10

Co4 = running proof function for load 4, term. 11-12

NOTE: also the following values oA5, oA6, LP1, LP2, HP, Co5, Co6 are present. These

values must not be used
iF02 Digital input 2 configuration (13-15) – For the values see iF01; Factory setting oA2.
iF03 Digital input 3 configuration (16-17) – For the value see iF01; Factory setting oA3
iF04 Digital input 4 configuration (16-18) – For the value see iF01; Factory setting oA4
iF05 Digital input 5 configuration (19-20) – For the value see iF01; Factory setting nu
iF07 Digital input 7 configuration ( 22-23): – For the values see iF01; Factory setting ES.

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NB: THE ABOVE FUNCTIONALITIES ARE ENABLED ONLY WHEN P4C=NP. With

P4C = nt10 or nt86 this input is operating as a NTC 10K temperature sensor or NTC

86K temperature sensor
iF08 Digital input 8 configuration (terminals 22-24): For the values see iF01; Factory setting

LL
iP01 Digital input 1 polarity (13-14):

oP: the digital input is activated by opening the contact;

CL: the digital input is activated by closing the contact.
iP02 Digital input 2 polarity (13-15):

oP: the digital input is activated by opening the contact;

CL: the digital input is activated by closing the contact.
iP03 Digital input 3 polarity (16-17):

oP: the digital input is activated by opening the contact;

CL: the digital input is activated by closing the contact.
iP04 Digital input 4 polarity (16-18):

oP: the digital input is activated by opening the contact;

CL: the digital input is activated by closing the contact.
iP05 Digital input 5 polarity (19-20):

oP: the digital input is activated by opening the contact;

CL: the digital input is activated by closing the contact.
iP07 Digital input 7 polarity (22-23):

oP: the digital input is activated by opening the contact;

CL: the digital input is activated by closing the contact.
iP08 Digital input 8 polarity (22-24)

oP: the digital input is activated by opening the contact;

CL: the digital input is activated by closing the contact.
iP09: Polarity of High pressure-switch alarm (terminals 45-46)
oP =HP alarm is signaled without voltage presence

cL= HP alarm is signaled with voltage presence
iP10: Polarity of Low pressure-switch alarm (terminals 44-45)
oP =LP alarm is signaled without voltage presence

cL= LP alarm is signaled with voltage presence
d1d Digital input set as oA1 or Co1 activation delay (0÷255s), This delay it is considered

when i1F or i2F or i3F or i4F or i5F or i7F or i8F is set as oA1 or Co1
d2d Digital input set as oA2 or Co2 activation delay (0÷255s), This delay it is considered

when i1F or i2F or i3F or i4F or i5F or i7F or i8F is set as oA2 or Co2
d3d Digital input set as oA3 or Co3 activation delay (0÷255s), This delay it is considered

when i1F or i2F or i3F or i4F or i5F or i7F or i8F is set as oA3 or Co3
d4d Digital input set as oA4 or Co4 activation delay (0÷255s), This delay it is considered

when i1F or i2F or i3F or i4F or i5F or i7F or i8F is set as oA4 or Co4
did Liquid level alarm, signaling delay: (enabled only if a digital input is set as LL)

0÷255min

didA External alarm, signaling delay: (enabled only if a digital input is set as EAL) 0÷255min
ALMr Manual reset of alarms for compressors and fans.

no = automatic recover of alarm: regulation restart when the correspondent digital input

is disabled; yES = manual recover for the alarms of compressors and fans See also

par.20.1.2

17.4 Display and Measurement unit

The measurement unit of the parameters referred to temperature or pressure depends on the
parameters dEU, CF and PMu.

NOTE: The controller automatically converts values of set points and parameters referred to the
pressure/temperature when the dEU parameter is changed. In any case check the value of the
parameters referred to temperature and pressure after changing dEU.

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dEU: Selection of the kind of measurement unit: pressure or temperature

dEU = tMP: the parameters referred to pressure/temperature will be expressed in

temperature according to the value of the CF parameter (°C or °F)

dEU = PrS: the parameters referred to pressure/temperature will be expressed in

pressure according to the value of the PMU parameter (bar, PSI or KPA)
CF Measurement unit for temperature: it is used only with dEU = tMP, and it set the

measurement unit for parameters referred to temperature/pressure.

°C = Celsius degree
°F = Fahrenheit degree
PMU Measurement unit for pressure: it is used only with dEU = PrS, and it set the

measurement unit for parameters referred to temperature/pressure.

bar = bar

PSI = PSI

PA = kPA
rES Resolution for °C and bar (in = integer; dE= decimal point)
dFE Pressure filter enabling: YES = enabled; no = not enabled; This filter takes in account

the average value of the pressure during the last cycle for the regulation.

dEU1 Default visualization for upper display: PrS= Pressure; tPr= temperature
dSP2 Probe selection for lower display: nu = display switched off - P1 = Probe 1 - P2 = Probe

2 - P3 = Probe 3 - P4 = Probe 4 - StC1 = Compressor Set Point - StC2 = NOT SET IT –

SetF = Fan set point
dEU2 Default visualization for lower display: tPr= temperature, PrS= Pressure;

17.5 Compressor regulation

Pbd: Proportional band or neutral zone width (0.1÷5.0bar/0.5÷30°C or 1÷150PSI/1÷50°F)

The band (or zone) is symmetrical compared to the target set point, with extremes: set-

Pbd/2 ÷ set+Pbd/2. It is used as proportional band for PI algorithm.

The measurement unit depends on the dEU, CF, PMU par.
rS Proportional band offset: PI band offset. It permits to move the proportional band of the

PI. With rS=0 the band is between Set-Pbd/2 ÷ Set+Pbd/2;

inC Integration time: (0 ÷ 999s) PI integration time
dGSP Digital compressor always activated at first:
no: other compressors if available are allowed to start when the digital compressor is

locked by safety timers. This allows the system to satisfy the cooling demand when the

digital compressor is unavailable.
yES: the digital compressor is always started as first. If unavailable due to safety timers

the regulation will be locked till timers will be over.

SUt Start up time: The digital scroll valve is energized for the SUt when the compressor starts

(0÷3s)
tdS Digital scroll cycle time: (10÷40s) it sets the cycle time for the digital scroll (DGS) valve

modulation.
PM DGS minimum capacity (10÷PMA with dGty=ScrL; 0÷PMA = dGty=StrM): it sets the

minimum capacity allowed to the digital compressor.

If digital SCROLL is used dGt = SCrL the allowed range is 10÷PMA

If digital STREAM is used dGt = StrM the allowed range is 0÷PMA
PMA DGS maximum capacity (PM÷100) it sets the maximum capacity allowed to the DGS
ton DGS at maximum PMA capacity before starting a new load (0÷255s)
toF DGS at minimum PM capacity before stopping a load (0÷255s)
MinP Minimum allowed DGS capacity for poor lubrication monitoring (0÷100%; with 0

function excluded) If the DGS compressor works for the tMIn time with a capacity (in

percentage) equal or lower than MinP, it is forced to work at 100% for the tMAS time in

order to restore the right lubrication.

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tMin Maximum DGS functioning time at a capacity lower than MinP, before working at

full capacity (PMA) (1÷255min)
tMAS Time of DGS functioning at maximum capacity (PMA) to restore the right

lubrication (1÷255min)
ESC Energy saving value for compressors: (-20÷20bar; -50÷50°C) this value is add to the

compressor set point.
onon: Minimum time between 2 following switching ON of the same compressor (0÷255

min).

oFon: Minimum time between the switching off of a compressor and the following

switching on. (0÷255min). Note: usually onon is greater than oFon.
don: Time delay between the insertion of two different compressors (0÷99.5min; res.

10s).
doF: Time delay between switching off of two different compressors (0÷99.5 min; res.

10s)

donF: Minimum time a stage stays switched ON (0÷99.5 min; res. 10s)
Maon Maximum time for compressor ON (0 ÷ 24 h; with 0 this function is disabled.) If a

compressor keeps staying on for the MAon time, it’s switched off and it can restart after

the oFon standard time.
FdLy: “don” delay enabled also for the first call. If enabled, the triggering of the step is delayed

for a “don” value, respect to the call. (no = “don” not enabled; yES=”don” enabled)
FdLF “doF” delay enabled also for the first switching off. It enables the “doF” delay between

the request of a release and the actual switching off. (no = “doF” not enabled; yES=”doF”

enabled)
odo: Regulation delay on start-up: (0÷255s) on switching ON the instrument starts working

after the time delay imposed in this parameter.
LSE: Minimum set point: The measurement unit depends on dEU parameter. It sets the

minimum value that can be used for the set point, to prevent the end user from setting

incorrect values.
HSE: Maximum set point: The measurement unit depends on dEU parameter. It sets the

maximum acceptable value for set point.

17.6 Liquid injection thermostat

Lit: Set point ( °C) for cooling injection thermostat (0 ÷ 150°C) The reference probe is set

by LiPr parameter, the thermostat relay is given by the relay set as oAi = Lin.
Lid: Differential for cooling injection thermostat (0.1 ÷ 10.0) The reference probe is set by

LiPr parameter

LiPr Probe for cooling injection thermostat:

nP: function disabled

P3: probe P3 (term. 38-42)

P4: probe P4 (term. 22-23)

17.7 Fans regulation

Pb Proportional band zone width (0.1÷30.0°C; 1÷50°F; 0.1÷10.0bar, 1÷150PSI;

10÷1000KPA).

NOTE: Set the dEU par. and the target set point for fans before setting this

parameter.

The band is symmetrical compared to the target set point, with extremes: SETF+Pb/2 ÷

SETF -Pb/2. The measurement unit depends on the dEU par.
ESF Energy saving value for fans: (-20÷20bar; -50÷50°C) this value is add to the fans set

point.
PbES Band offset for fan regulation in ES (-50.0÷50.0°C; -90÷90°F; -20.0÷20.0bar; -

300÷300PSI; -2000÷2000KPA). During energy saving

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Fon Time delay between the insertion of two different fans (0÷255sec).
FoF Time delay between switching off of two different compressors (0÷255 sec)
LSF Minimum set point for fan: The measurement unit depends on dEU parameter. It sets

the minimum value that can be used for the set point, to prevent the end user from setting

incorrect values.
HSF Maximum set point for fan: The measurement unit depends on dEU parameter. It sets

the maximum acceptable value for set point.

17.8 Alarms – compressor section

PAo: Alarm probe exclusion at power on. it is the period starting from instrument switch on,

before an alarm probe is signaled. (0÷255 min). During this time if the pressure is out of

range all the compressor are switched on.
LAL: Low pressure (temperature) alarm – compressor section: The measurement unit

depends on dEU parameter: (PA04 ÷ HAL bar; -50.0÷HAL °C; PA04÷HAL PSI; -58÷HAL

°F) It’s independent from the set point. When the value LAL is reached the A03C alarm

is enabled, (possibly after the tAo delay time).
HAL: High pressure (temperature) alarm– compressor section: The measurement unit

depends on dEU parameter: (LAL ÷ PA20 bar; LAL÷150.0 °C; LAL÷PA20 PSI; LAL÷302

°F). It’s independent from the set point. When the value HAL is reached the A04C alarm

is enabled, (possibly after the tAo delay time).
tAo: Low and High pressure (temperature) alarms delay– compressor section: (0÷255

min) time interval between the detection of a pressure (temperature) alarm condition and

alarm signaling.
ELP Electronic pressure switch threshold: (-50°C÷STC1; -58°F÷STC1; PA04÷STC1);

Pressure / Temperature value at which all the compressors are switched off. It has to be

set some degrees above the mechanical low pressure switch value, in order to prevent

mechanical low pressure activation.
SEr: Service request: (1÷999 hours, res. 10h; 0 = alarm excluded ) number of running hours

after that the “A14” maintenance call is generated.
PEn: Low pressure-switch intervention numbers: (0÷15). If the low pressure-switch is

enabled PEn times in the PEI interval, the controller is locked. Only the manually

unlocking is possible. See also the alarms table at paragraph 0. Every time the

pressure-switch is enabled all the compressor are turned off.
PEI: Pressure-switch interventions time (0÷15 min) Interval, linked to the Pen parameter,

for counting interventions of the low pressure-switch..

SPr: number of steps engaged with faulty probe. (0÷6).

17.9 Alarms – DLT section

dtL Digital compressor discharge line temperature alarm (alarm referred to the probe set

in the par. dtLi) (0÷180°C; 32÷356°F). If the probe 3 is used to detect the temperature of

the discharge line of the DGS compressor, the compressor is switched off when this

threshold is reached.
dLd Digital compressor discharge line temperature alarm delay (alarm always referred to

P3 probe) (0÷15min)
dLH Digital compressor discharge line alarm reset differential (alarm always referred to

P3 probe) (0.1÷25.5°C; 1÷50°F)

dtLi Probe selection for the discharge line temperature monitoring:

nP: function disabled

P3: probe P3 (term. 38-42)

P4: probe P4 (term. 22-23)

dtLP Digital Compressor Capacity percentage in case of discharge line temperature alarm

(0÷80%; with 0 the compressor is stopped)

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17.10 Alarms – fans section

LAF: Low pressure alarm – fans section: The measurement unit depends on the dEU

parameter: (FA04 ÷ HAF bar; -50.0÷HAF °C; FA04÷HAF PSI; -58÷HAF °F) It’s

independent from the set point. When the value LAF is reached the LA2 alarm is enabled,

(possibly after the AFd delay time).
HAF: High pressure alarm – fans section: The measurement unit depends on the dEU

parameter: (LAF÷FA20 bar; LAF÷150.0 °C; LAF÷FA20 PSI; LAF÷302 °F). It’s

independent from the set point. When the value HAF is reached the HA2 alarm is enabled,

(possibly after the AFd delay time).
AFd: Low and High pressure alarms delay – fans section: (0÷255 min) time interval

between the detection of a pressure alarm condition in the fans section and alarm

signaling.

HFC Compressors off with high pressure (temperature) alarm for fans
no = compressors are not influenced by this alarm

yES = compressors are turned off in case of high pressure (temperature) alarm of fans

HFdP Digital Compressor Capacity percentage in case of high condenser pressure

(temperature) alarm (0÷80%; with 0 the compressor is stopped)

dHF Interval between 2 compressors turning off in case of high pressure (temperature)

alarm for fans (0 ÷ 255 sec)
PnF: High pressure-switch intervention numbers – fans section: (0÷15 with 0 the manually

unlocking is disabled) if the high pressure-switch is enabled PnF times in the PiF interval,

the controller is locked. It can be unlocked only manually. See paragraph 0. Every time

the pressure-switch is enabled all the compressors are turned off and all the fans are

turned on.
PiF: Pressure-switch interventions time – fans section (1÷15 min) Interval, linked to the

PEn parameter, for counting interventions of the high pressure-switch..

FPr Number of fans engaged with faulty probe. (0÷#fans).

17.11 Suction superheat

ASH0 Differential for low superheat pre-alarm. (0.1 to 30.0°C/ 1 to 60°F).
The low superheat pre-alarm warning is sent when the superheat (SH) is lower than ASH2

(low superheat alarm threshold) + ASH0, possibly after the ASH1 delay.
ASH1 Delay for signalling low superheat pre-alarm (0÷255sec)

If the superheat is below the ASH2+ASH0 threshold for ASH1 time the low superheat

pre-alarm warning is sent.
ASH2 Low suction superheat alarm threshold (0.1÷15.0°C/ 1÷30°F). With SH < ASH2 the

low superheat alarm is sent, possibly after the ASH3 delay
ASH3 Delay for signalling low superheat alarm (0÷255sec)

If the superheat is below the ASH2 threshold for ASH3 time the low superheat alarm

message is sent.
ASH4 Switching off compressors with low superheat alarm (No, Yes)
ASH4 = no: compressors keep on working even with low superheat alarm.
ASH4 = yES: compressors are stopped in case of low superheat alarm.

ASH5 Differential to restart regulation after of low superheat alarm with compressor stop

(0.1 to 15.0°C/ 1 to 30°F). In case of regulation stop (ASH4= yES), it restarts when SH >

ASH2+ASH5
ASH6 Delay to restart regulation after superheat > ASH2+ASH5 (0÷255 min). If the

regulation is stopped because of low superheat alarm, it can restart when

SH>ASH2+ASH5 for the ASH6 time.

ASH7 Superheat value to enable hot gas injecting valve (0.1 to 15.0°C/ 1 to 30°F)
With a relay set as hot gas injection valve, (oA2 or oA3 or oA4 = HGi), the relay is on with

SH < ASH7 – ASH8.
ASH8 Differential for ASH7 (0.1 to 30.0°C/ 1 to 60°F)

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ASH9 Probe selection for superheat monitoring (nP, P3, P4)
ASH9 = nP no superheat control
ASH9 = P3 the probe to calculate the superheat (SH) is the probe P3 (term. 38-42)
ASH9 = P4 the probe to calculate the superheat (SH) is the probe P4 (term. 22-23). In

this case also the parameter P4C must be set as nt10 or nt86.

17.12 Dynamic set point for fan

dSEP Dynamic set point reference probe

nP: no probe; function disabled

P3: probe P3 (term. 38-42)

P4: probe P4 (term. 22-23)
dSES External temperature value to start dynamic regulation (-50÷150°C; -58÷302 °F)
dSEb External band width for dynamic set point (-50.0 ÷ 50.0°C; -90 ÷ 90°F)
dSEd Set point differential for dynamic set point: (-20.0÷20.0°C; -50.0÷50.0PSI; -

300÷300°F)

Fan 1
Set point

AUX
Temperature

SETF+dSEd

dSES+dSEb

dSES

SEtF

17.13 Analog output (optional)

AoC Analog output setting
tEn = 0÷10V output
cUr = 4-20mA output
AOF Analog output function

nu = analog output disabled;

Inc1= To drive inverter for suction frequency compressor ;

Inc2 = not set it

inF= to drive ECI fan or inverter for fan
FrE = “Free”, proportional to the probe P3 and P4.
AOP Reference probe for the analog output 1 It is used only if AOP=FrE
nP = not probe
P3 = probe P3
P4 = probe P4
LAO Temperature value associated to minimum value of analog output (AOM)

(-50.0÷150.0°C, -58÷302°F).

UAO Temperature value associated to the maximum value of analog output, 10V or

20mA (-50.0÷150.0°C, -58÷302°F).
AOM Minimum value for analog output (0÷100%)
AOt Time of analog output at max after the start (0÷15s)
MPM Maximum % variation per minute: (nu; 1÷100)
nu = not used: function disabled
1÷100 = it sets the maximum percentage variation per minute of the analog output.
SAO Percentage of analog output in case of probe failure: (0 ÷ 100%)
AOH Maximum analog output percentage when silence mode function is enabled (0÷100)

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17.14 Other

tbA Alarm relay silencing: by pushing one of the keypad buttons. no= alarm relay stays on;

yES= alarm relay is switched off by pushing any keys.
OAP Alarm relay output polarity: cL=closed when activated; oP= opened when activated
oFF Switching ON/OFF enabling from keyboard: (no = disabled; yES= enabled) It permits

the switching ON/OFF of the instrument by pressing the SET key for more than 4s.
bUr Buzzer enabling
no = the buzzer is not used in case of alarm
yES = buzzer is used in case of alarm
Adr: Serial address (1 –247) It is used in monitoring system.
rEL Software release for internal use.
Ptb Parameter table code: readable only.
Pr2 Access to Pr2 parameter level

18. Type of regulation

18.1 DIGITAL COMPRESSOR REGULATION

18.1.1 Digital scroll: main parameters set up

EG: 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

The pressure is adjusted by a PI regulation.

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18.1.2 Regulation Start: increasing capacity

a. The regulation starts when the suction pressure (temperature) increases and reaches

the value SET-Pbd/2+(Pbd*PM)/100. At first, if available, the digital compressor is
powered, and it is modulated in PWM mode.
NOTE: At start up the valve is energized for SUt seconds.

b. Within the adjustment range (SET–Pbd/2 ÷ SET+Pbd/2) the digital scroll compressor is

activated in PWM mode in accordance with the value of the control variable. (NOTE:
When the TRIAC is on the compressor is discharged; when the TRIAC is off the
compressor is operative).

c. When the pressure is greater than [SET + Pbd/2] and the TRIAC output is already at

maximum, another compressor is started after the “ton” delay time.

d. Then, if additional capacity is required (pressure higher than [SET + Pbd/2] another

compressor starts after the “don” time.

NOTE: If the pressure exceeds the value SET+Pbd/2 and the DGS compressor is not available
(blocked by onon, oFon, safety digital input), another compressor is started (if available) in order
to meet the adjustment request.

18.1.3 Decreasing capacity and regulation stop

a. When the pressure is lower than [SET - Pbd/2], the DGS compressor is still modulated

to minimum capacity for the toF time

b. At the end of the toF time the load with more working hours is shut down. If the load

must stay on because the donF time is not over yet, the next load is considered, and so
on until a load that can be shut down is found or becomes available.

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c. This procedure continues with all active loads, with the shutdowns spaced out by the

doF time setting.

d. When only the DGS remains on, at the end of the doF time the DGS is shut down too.

18.1.4 Digital Stream: Main parameters set up

EG: Plant with 2 compressors Stream 6D and 2 fans default configuration with PP11, PP30
pressure transducers:

oA1 = dGS

oA2 = 6dG

oA3 = FAn,

oA4 = FAn,

dGty = StrM

The pressure is adjusted by a PI regulation, following the same logic of the digital scroll see
previous paragraphs: 18.1.2 and 18.1.3

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18.1.5 Limitation of digital compressor capacity by parameters PM and
PMA

The capacity of the DGS compressor can be limited by the PM and PMA parameters, as shown
in the following diagram.

The capacity of the DGS compressor is limited by the PM and PMA parameters, where
PM: in percentage, it sets the minimum capacity of the DGS activation during a period tdS. For

instance with tdS = 20s and PM = 20, the minimum activation of the DGS is 4s.

NOTE
For digital scroll (dGty = SCrL) the minimum allowed value of PM is 10
For digital stream (dGty = StrM) the minimum allowed value of PM is 0

NOTE: for a proper functioning of the DGS, it’s recommend a minimum activation time of 2s.
PMA: it limits the percentage of the DGS activation during a tdS period according to the

formula: ((Pbd * PMA) / 100) * tdS.

18.2 Proportional Band regulation - only for fans

The fan regulation band Pb is divided by the number of fans:
The numbers of fans switched ON is proportional to the value of the input signal: when this

distances itself from the target set point and enters the various bands, the compressors are
switched ON, to be then turned OFF when the signal brings near the set point.

In this way if the pressure is greater than regulation band, all the fans are on, if the pressure
(temperature) is lower than the regulation band all the fans are off.
Naturally also for this regulations all the delays (Fon and FoF) are valid.

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Regulation according to the running hours
The algorithm switch on and off the loads according to the running hours of each load. In this way
the running hours are balanced.

Example
4 Fans: oA2 =FAn; oA3 = FAn; oA4 = FAn; oA6 = FAn:

rot = yES rotation enabled

F1

F2

F3

F4

SETF

Set+Pb/2

Set-Pb/2

ZIC

Set+Pb/4

Set-Pb/4

Fon
FoF

ALL LOADS ON

ALL LOADS OFF

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18.3 Condenser with Inverter or Ec Fans–Analog Output Setting

This configuration is used when all fans of the condensing group are ECI fans or driven by one
inverter or a chopped phase driver.
The capacity used by the inverter is proportional to the delivery pressure value inside the
regulation band (SETF-Pb/2÷ SETF+Pb/2).

18.3.1 Condenser fan configurations and Parameters

Parameter

Description

Action

oA(i) = inF

Set 1 relay for inverter

One relay is used to enable the action of the inverter.

AoC = tEn

Analog output setting

Set the output as 0-10V

AoF = InF

Analog output function

Set the output to drive ECI or inverter fan

AOM =0

Minimum value for
analog output

The minimum voltage is 0V.
NOTE: verify on the inverter of ECI fan of chopped
phase driver that with this input a proper output is
supplied to the fan.

AOt = 5

Time of analog output
at max after the start

To start the fan the controller supplies 10V output for
5s, then starts standard regulation

MPM = 100

Maximum % variation
per minute

The analog output takes 1 min to move from the min
to the maximum

18.3.2 How to set it

Parameters involved: oA(i) = inF; AoC = tEn, AoF = InF, Aot = 0, AOM = 30, MPM = 100

P2

Volt

10

0

AOM

100

10

P2

SETF-Pb/2 SETF+ Pb/2

On

OAi = inF

SETF-Pb/2 SETF- Pb 100-2AOM

2 100

a. If required, set a relay to drive the invert (is used to signal to the inverter to start and stop the

regulation), by setting: oA(i) = inF inverter for fans

b. Set the kind of signal of the analog output current (4-20ma) or voltage (0-10V) by the

Analog output setting parameter “AoC”: tEn = 0÷10V output; cUr = 4-20mA output
c. Set the function of the analog output: AoF = InF
d. Set the time of the analog output at max after start up EI: Aot = 3s
e. Set the max % variation per min (MP)
f. At last set also the percentage of analog output in case of probe failure: (0 ÷ 100%)SAO

18.4 Analog output “free”

This setting is used to link the analog output 1 to a temperature probe. The analog output will take
values proportional to the temperatures detected by the probe P3 or P4, according to the setting.

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18.4.1 Analog output “free” configurations and Parameters

Parameter

Description

Action

AoC = tEn

Analog output setting

Set the output as 0-10V

AoF = FrE

Analog output function

Set the output to drive for instance a de­superheater

AOP = P3

Reference probe for the
analog output 1 (used only if
AOP=FrE)

It’s possible to set only P3 or P4 probes.
P3 must be set as temperature probe:
P3C = nt10 (NTC 10K) or nt86 (NTC 86K)

LAO = 20

Temperature value
associated to minimum value
of analog output AOM.

It’s the start scale of the analog output

UAO = 40

Temperature value
associated to the maximum
value of analog output (10V)

It’s the end scale of the analog output

AOM =0

Minimum value for analog
output

The minimum voltage is 0V.
NOTE: verify on the inverter of ECI fan of
chopped phase driver that with this input a
proper output is supplied to the fan.

AOt = 5

Time of analog output at max
after the start

With AOt = 5 the controller supplies 10V output
for 5s at fan start, then starts standard
regulation

MPM = 100

Maximum % variation per
minute

The analog output takes 1 min to move from
the min to the maximum

18.4.2 How to set it

Parameters involved: AoC = tEn, AoF = FrE, AOP = P3: LAO = 20; UAO = 40; Aot = 0, AOM = 30,
MPM = 100

P3

Volt

10

0

AOM

100

10

LAO

UAO

LAO + (UAO-LAO)*AOT
100

a. Set the kind of signal of the analog output current (4-20ma) or voltage (0-10V) by the Analog

output setting parameter “AoC”: tEn = 0÷10V output; cUr = 4-20mA output

b. Set the function of the analog output: AoF = FrE
c. Set the time of the analog output at max after start up EI: Aot = 3s
d. Set the start scale temperature by LAO parameter, at which correspond the AOM value of

analog output

e. Set the end scale temperature by UAO parameter, at which correspond the maximum value

of analog output

f. Set the max % variation per min (MPM)
g. At last set also the percentage of analog output in case of probe failure: (0 ÷ 100%)SAO

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19. Additional functions

19.1 Compressor running proof function

The digital inputs are normally used to signal a compressor or fan failure
It’s also possible to set the digital inputs for running proof signalling. That means when
compressor relay is activated, after a configurable delay the digital input related to the compressor
should goes on too (usually a contact from compressor contactor) and the controller has the

“confirmation” that compressor is running.
If it doesn’t, that means something is wrong between the controller and the compressor itself.

19.1.1 Parameters and settings

The parameters involved are:

- iF01, iF02, iF03, iF04, iF05, iF07, iF08: configuration of digital input 1, 2, 3, 4, 5, 7, 8
with the related polarity:

- iP01, iP02, iP03, iP04, iP05, iP07, iP08: polarity of digital input 1, 2, 3, 4, 5, 7, 8
with the related delay before alarm signalling:

- d1d, d2d, d3d, d4d,: delay before signalling alarm with digital input set respectively as oA1

or Co1, oA2 or Co2, oA3 or Co3, oA4 or Co4.

19.1.2 Alarms related

Label

Meaning

Reaason

Action

Reset

FC01…
FC04

Running proof
alarm with
automatic recover

The digital input set as Co1..
Co6 has not been activated by
d1d, … d4d time

The compressor 1..4 is
switched off and the
safety timers start

Automatic – when safety timers are
over

LC01…
LC04

Running proof
alarm with manual
recover

5 running proof alarms
happened in a hour.

The compressor 1..4 is
switched off

Manual by means:

- Controller off-on

- Reset by keyboard

- Reset by monitoring system

19.1.3 Example

EI:

Rack with 2 compressors, with compressor safeties and running proof circuit for each compressor:
Compressor 1 on relay 1: oA1 = CPr1
Compressor 2 on relay 2: oA2 = CPr1
Safety for compressor 1 on digital input 1: iF01 = oA1
Safety for compressor 2 on digital input 2: iF02 = oA2
Running proof circuit for compressor 1 on digital input 3: iF03 = Co1
Running proof circuit for compressor 2 on digital input 4: iF04 = Co2
2 seconds delay before signalling alarm and stopping the compressor 1: d1d = 2
2 seconds delay before signalling alarm and stopping the compressor 2: d2d = 2

When the compressor 1 (or 2) starts, if by 2sec the digital input 3 (or 4) is not activated (running
proof function) the FC01 alarm is signalled and the compressor is stopped.

Alarm recover as soon as the safety timers of the compressor (onon, ofon) are over and
compressor come back available for regulation.
After 5 consecutive alarms, the alarms move from automatic restart to manual restart and it must
be reset by Keyboard, of by switching off and on the controller.

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19.2 Flood protection function

To ensure the maximum safety of the plant, a relay is activated when the compressors can’t be
switched on since they are blocked due to safety times or for other issues or stopped for
maintenance.
This output can be used to block the liquid injection to the cabinets to avoid to flood the suction
collectors.
The relay will be disabled once the compressors can restart (see scheme ).

To enable this function set one relay by the parameters oA2 or oA3 or oA4, as flood protection,
EI oA4 = Liq, and then connect it to the external device that blocks the cabinet injection.
NOTE: the relay set as flood protection is automatically activated even when the controller is in
stand-by mode.

NOTE

If the compressors are activated in fix sequence, (Sty = no), and the compressor that has to be
activated is locked by safety timers, the relay set as flood protection is switched on till the safety
timers are over.

19.3 Suction superheat monitoring

Controller can monitor the suction superheat, and signal situations of low superheat, with a pre­alarm and alarm thresholds.
According to the settings, compressors can be stopped in case of low superheat alarm, to
preserve compressor integrity.

1

1

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19.3.1 Suction Superheat detecting

To detect the suction
superheat an auxiliary
probe among P3 (term.
38-42) or P4 (term. 22-

23) has to be set as
superheat temperature
probe.
To do this set ASH9 = P3
or P4.
Controller automatically
calculates the suction
superheat using the
value of the suction
probe P1 and the probe
set in the parameter
ASH9.
The SH is available after
1 minute since at least

one compressor is running.

19.3.2 Low superheat signalling and actions

Controller can signal low superheat pre-alarm, only warning, and low superheat alarm, warning
and regulation according to parameter ASH4.

The alarm messages and the regulation are described in the following table

Label

Meaning

Cause

Action

Recovery

PrSH

Low
superheat
Pre-allarm

The superheat is less
than: SH< ASH2 +
ASH0 for ASH1 time

Only warning

Automatic:
when superheat:
SH>ASH0+ASH2+1°C(2°F)

ALSH

Low
superheat
allarm

The superheat is less
than: SH< ASH2 for
ASH3 time

Regulation depends on ASH4:
ASH4 = no: regulation not affected.
ASH4 = yes: regulation is stopped.

Automatic:
when superheat:
SH> ASH5 + ASH2

19.4 Hot gas injection valve

Controller can manage a hot gas injection valve to increase suction superheat. See above figure.

19.4.1 Parameters

A relay must be set as hot gas valve: oA2 or oA3 or oA4 = HGi, and
an auxiliary probe among P3 (term. 38-42) or P4 (term. 22-23) has to be set as superheat
temperature probe ASH9 = P3 or P4.
Then the following parameters:

ASH7 Superheat value to enable hot gas injecting valve (0.1 to 15.0°C/ 1 to 30°F)
ASH8 Differential for ASH7 (0.1 to 30.0°C/ 1 to 60°F)

19.4.2 Regulation:

The regulation respects the following schema:
Superheat < ASH7 – ASH8  HGi on

Superheat > ASH7  HGi off

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ASH7 < Superheat < ASH7 – ASH8  Status.
Dove SH = valore di SH

19.4.3 Special conditions

a. With ASH9 = nP: none probe set as SH probe and one relays set as HGi (valve for hot

gas injection) the configuration error is displayed “no Probe For SH”, and the relay set
as HGi is never activated..

b. If the probe used to calculate the SH is in error the related probe fault alarm is

generated (P3 or P4) and the HGi relay is not activated.

20. Alarm list

Usually alarm conditions are signaled by means of:

1. Activation of alarm output 0-12V

2. Buzzer activation

3. Message on proper display

4. Log of alarm: code and duration.
The table at paragraph 20.3

20.1 Types of alarms and signaling managed

20.1.1 A12: Configuration alarm

The following configuration parameters are checked after each modification:

OA2 OA6

Outputs 2- 6 configuration

P2P

Second probe presence

AOP

Probe for analog output

When these parameters are set in wrong way an alarm message is generated: the label A12 is
shown on the upper display, while the lower display the following messages are shown:

Mess.

Errata

Corrige

Too Many dGS

output

More than one oAi has
been set as dGs (digital
scroll)

• Check the oAi parameters and set
them different from dGS.

Too Many dGSt

output

One oAi has been set as
dGst (triac for digital
scroll)

• Check the oAi parameters and set
them different from dGSt.

Too Many 6dG

output

More than one oAi has
been set as 6dG (blocked
suction valve for digital
stream 6D)

• Check the oAi parameters and set
them different from 6dG.

6dG bEForE
dGS ConFig

Error

oAi configured as 6dG
before the dGS

• Check the oAi parameters and set
6dG after dGS.

dGSt OutPut

Error

One oAi has been set as
dGst (triac for digital
scroll)

• Check the oAi parameters and set
them different from dGSt.

dGS not

PrESEnt

One oAi has been set as
dGs (digital scroll)

• Check the oAi parameters and set
them different from dGS.

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Mess.

Errata

Corrige

StEP ConFiG

Error

Load (step) configuration
error

• A relay oA(i) has been set as
compressor without a previous relay
oA(i-1) has been set as compressor.
EI oA1 = StP

no P3 ProbE

PrESEnt

The P3 probe is
requested for a function,
but it’s not present

• Check the parameters P3C

no LoAdS For

rEGuLAtion

None oA(i) is set as
compressors or fans

• Check the setting of oA2, oA3, oA4,
oA6 parameters

AOP2

P2 probe not available for
the 4÷20mA output

• P2 probe not available P2P =no.
Enable the probe setting: P2P =yES

• The second probe P2 is used to
control the temperature of the engine
of screw compressors. Check CtyP
and set it different from Scr.

no FAn ProbE

P2 probe not available for
fan regulation

• P2 probe not available P2P =no.
Enable the probe setting: P2P =yES

• The second probe P2 is used to
control the temperature of the engine
of screw compressors. Check CtyP
and set it different from Scr.

too MAnY InC1

More than one oAi has
been set as inC1 (inverter
for suction 1)

• Check the oAi parameters and set only
1 as “inC1”.

No AnALoGuE

out For InC1

None analogue output
has been set as “inC1”

• Check AoF and 2AoF and set one of
them as “inC1”

too MAnY InF

More than one oAi has
been set as inF (inverter
for fan)

• Check the oAi parameters and set only
1 as “inF”.

No AnALoGuE

out For InF

None anlogue output has
been set as “inF”

• Check AoF and 2AoF and set one of
them as “inF”

CPr Circuit

conFiG Error

The kind of outputs are
not compatible with the 2
suction circuits

• Check parameters oA(i) , CtyP and
set CtyP different from Scr.

AO1 And AO2

SAME

Function

AoF and 2AoF have the
same setting

• Set AoF and 2AoF properly.

no Probe For

SH

One relay is set as hot
gas injection valve (oA2
or oA3 or oA4 = HGi), but
the probe to detected th
superheat is missed:
ASH9 = nP

• Set a probe to detect the superheat by
the parameter ASH9 = P3 or P4.

• If the hot gas injection valve is not
present, set oA2 or oA3 or oA4
different from HGi.

20.1.2 E01L, Electronic Pressure switch alarm, suction section

Parameters
ELP: Electronic pressure switch threshold: (-50°C÷SETC; -58°F÷SETC; PA04÷SETC);

Pressure / Temperature value at which all the compressors are switched off. It has to be set some
degrees above the mechanical low pressure switch value, in order to prevent mechanical low
pressure activation.

Actions

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Electronic low pressure: every time the suction temperature/pressure is less than ELP value all
the compressors are switched off. The instrument restarts the standard operating mode when
pressure/ temperature increases.

20.1.3 E0H1, E0L1 Pressure switch alarm, suction and condensing
sections

Terminals
WARNING: THESE TERMINALS REQUIRE A MAIN OF VOLTAGE CONNECTION

Low pressure switch input: 44-45, high pressure switch input: [45-46].

Parameters
iP10: Low pressure switch polarity: It establishes if the input is activated by giving (iP10=cL)

or by removing (iP10=oP) main voltage to the terminals.
iP09: High pressure switch polarity: It establishes if the input is by giving (iP09=cL) or by
removing (iP09=oP) main voltage to the terminals.

Actions
Low pressure: every time the inputs are activated all the compressors are switched off. The

instrument restart the standard operating mode when the input is disabled. If there are PEn
activation in the PEi time, only manual resetting is allowed, by pressing the DOWN key for 3s or
by turning off and on the instrument.
High pressure: every time the inputs are activated all the compressors are switched off and fans
are switched on. The instrument restart the standard operating mode when the input is disabled.
If there are PnF activation in the PiF time, only manual resetting is allowed, by pressing the DOWN
key for 3s or by turning off and on the instrument.

20.1.4 EA1÷EA4: Compressors and fans safeties alarm.

Terminals
WARNING: THESE TERMINALS REQUIRE A FREE OF VOLTAGE CONNECTION.

The terminals (from 13 TO 18) really used depends on the number of loads. The protections
regarding the compressors and fans are connected to these inputs. If one of these protections is
enabling (E.I. for lack of oil or overheating, etc,) the corresponding load is turn off.

Parameters
iP01, iP02, iP03, iP04: establish if the input is activated by closing (cL) or by opening (=oP) the

terminals.
Actions

Every time one input is activated the corresponding output is turned off.

Recovery

Recovery depends on ALMr parameter:
With ALMr = no The instrument restart the standard operating mode when the input is disabled.
With ALMr = yES manual recover for the alarms of compressors and fans. Push the DOWN key
for 3s.

20.1.5 P1, P2; P3,P4: probe failure alarm

It is generated by failure in the probe P1, P2 , P3 or P4.
In case of P1 fault, number of steps engaged depends on the SPr parameter

In case of P2 fault, number of fans engaged depends on the FPr parameter

If the P3 or P4 probes are used for dynamic set point

The function is disabled and only the standard set point is used.

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Recovery

Automatic as soon as probe restarts working.

20.1.6 C1HA, C1LA, F-HA, F-LA High and low pressure (temperature)
alarms for compressors or fans

This alarm signals that the pressure (temperature) is out of limits established by parameters LAL
and HAL for compressors and LAF –HAF for fans.
The tAo and AFd parameters set the delay between alarm condition and alarm signaling.

Action
The alarm is signaled with standard action. The outputs are unchanged.

20.2 Buzzer muting

Press any buttons to silence the buzzer during an alarm condition.
Hold pressed for more than 3 seconds switch off the alarm relay during an alarm condition

20.3 Alarm conditions – summary table

Code

Description

Cause

Action

Reset

E01L

Low
electronic
pressure­switch alarm

Pressure/temper
ature less than
ELP value

All compressors
are turned off.
Fans unchanged.

Automatically when the pressure/temperature
increases more than ELP value

E0L1

Low
pressure­switch alarm

Low pressure
switch input
enabled

All compressors
are turned off.
Fans unchanged.

Automatically (if the number of activation are less
than PEn in the PEi time) when the input is disable.

- The compressors restarts working according to

the working algorithm.

Manually (if PEn activation happened in the PEi time)
When the input is disable:

a. hold pressed the Restart(DOWN)key for 3s or
b. turn off and on the instrument..

- The compressors restarts working according to

the working algorithm.

E0H

High
pressure
switch alarm

High pressure
switch input
enabled

- All

compressor
s are turned
off.

- All fans are

turned on.

Automatically (if the number of activation are less
than PEn in the PEi time) when the input is disable.

- Compressors and fans restart working according

to the working algorithm.

Manually (if PEn activation happened in the PEi time)
When the input is disable:

- hold pressed the Restart(DOWN) key for 3s or

- turn off and on the instrument.

Compressors and fans restarts working according to
the working algorithm.

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Code

Description

Cause

Action

Reset

P1

P1 probe
failure alarm

Probe failure or
out of range

 The

compressors
are activated
according to
the SPr or
PoPr
parameters.

Automatically as soon as the probe restarts working.

P2

P2 probe
failure alarm

Probe failure or
out of range

 The fans are

activated
according to
the FPr
parameters.

Automatically as soon as the probe restarts working.
P3

P3 probe
failure alarm

Probe 3 failure
or out of range

 The functions

related to the
third probe
are disabled.

Automatically as soon as the probe restarts working.

P4

P4 probe
failure alarm

Probe 4 failure
or out of range

 The functions

related to the
fourth probe
are disabled.

Automatically as soon as the probe restarts working.

EA1
EA2
EA3
EA4

Load safeties
alarm

Safeties
compressor/fan
input activation.
NOTE: with step
compressors 1
input for each
compressor has
to be used.

 the

correspondin
g load is
turned off.
(with step
compressors
all relays
referred to
the input are
disabled).

Recovery depends on ALMr parameter:
With ALMr = no The instrument restart the standard
operating mode when the input is disabled.
With ALMr = yES manual recover for the alarms of
compressors and fans. Push the DOWN key for 3s.

C1-LA

Minimum
pressure
(temperature)
alarm
compressors
section

Suction pressure
or temperature
lower than
LAL value

signaling only

Automatically: as soon as the pressure or
temperature reaches the (LAL+ differential) value.
(differential = 0.3bar or 1°C)

F-LA

Minimum
pressure
(temperature)
alarm fans
section

Condensing
pressure or
temperature
lower than
LAF value

signaling only

Automatically: as soon as the pressure or
temperature reaches the (LAF+ differential) value.
(differential = 0.3bar or 1°C)

C1-HA

Maximum
pressure
(temperature)
alarm
compressors
section

Suction pressure
or temperature
higher than
HAL value

signaling only

Automatically: as soon as the pressure or
temperature reaches the (HAL - differential) value.
(differential = 0.3bar or 1°C)

F-HA

Maximum
pressure
(temperature)
alarm fans
section

Condensing
pressure or
temperature
higher than
HAF value

Depends on the
parameter HFC

Automatically: as soon as the pressure or
temperature reaches the (HAF - differential) value.
(differential = 0.3bar or 1°C)

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Code

Description

Cause

Action

Reset

A5

Liquid level
alarm

Input enabled

signaling only

Automatically as soon as the input is disabled

A12

Configuratio
n alarms

See par. 18.1



A14

Load
maintenance
alarm

A load has
worked for the
hour set in the
SEr parameter

- signaling only

Manually: reset the running hour of the compressor
(see par.0

Running hours of loads)

dtL

Discharge
Line
Temperature

Pb3 or Pb4
Temperature
Higher than

dtL for the
dLd time

delay

Digital Scroll
switched off
reduced
capacity

Automatically as soon as the temperature becomes
lower than dtL.

EA

External
alarm

The
configurable
dig. Input set
as EA is
activated

signaling only

Automatically as soon as the input is disabled

InF

Inverter fan
alarm

The
configurable
dig. Input set
as EA is
activated

The analog out
set as INF is
switched off

Automatically as soon as the input is disabled

FC01
…
FC04

Running
proof alarm
with
automatic
recover

The digital input
set as Co1.. Co6
has not been
activated by d1d,
… d4d time

The compressor

1..4 is switched
off and the safety
timers start

Automatic – when safety timers are over

LC01
…
LC04

Running
proof alarm
with manual
recover

5 running proof
alarms
happened in a
hour.

The compressor

1..4 is switched
off

Manual by means:

- Controller off-on

- Reset by keyboard

- Reset by monitoring system

PrSH

Low
superheat
Pre-allarm

The superheat is
less than: SH<
ASH2 + ASH0
for ASH1 time

Only warning

Automatic:
when superheat:
SH>ASH0+ASH2+1°C(2°F)

ALSH

Low
superheat
allarm

The superheat is
less than: SH<
ASH2 for ASH3
time

Regulation
depends on
ASH4:
ASH4 = no:
regulation not
affected.
ASH4 = yes:
regulation is
stopped.

Automatic:
when superheat:
SH> ASH5 + ASH2

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21. Technical features

Housing: Self extinguishing ABS.
Case: 4 DIN modules 70x135mm with male and female connectors; depth 60mm.
Mounting: DIN RAIL mounted in an omega (3) din rail.
Protection: IP20.
Connections: pluggable screw terminal block  2.5 mm2 wiring.
Power supply: 230Vac ±10%. 50-60Hz, or 115Vac ±10%. 50-60Hz or 24Vac ±10%. 50-60Hz or

90÷260Vac 50-60Hz,

Power absorption: 6VA max.
Display: 4 digits red led and 4 digit orange led.
Inputs: 4 NTC probes, or 4 PTC probes or 2 4÷20mA or 0.5÷4.5Vdc transducer.
Digital inputs: up to 8 free voltage, 2 inputs main voltage
Relay outputs: 4 relay SPST, Rating according to the UL60730

Resistive 3A, 240VAC 50K cycles
Inductive (G.P.) 3A, 240VAC 30K cycles
Motor Load 240VAC, 1/8 hp (1.9FLA/11.4LRA), 30K cycles
Pilot Duty 180VA, 240VAC 30K cycles

Triac output: Pilot Duty 20W, 24Vac and 830mA max

Pilot Duty 20W, 230Vac and 87mA max

Analogue output: 2 x 4÷20mA or 0÷10V, SELV, Limited Energy circuit <15W
Serial output : RS485 standard Communication protocol: ModBus – RTU
Data storing: on the non-volatile memory (EEPROM).
Kind of action: 1B; Pollution grade: normal; Software class: A.
Operating temperature: -10÷60 °C.; Storage temperature: -25÷80 °C.
Relative humidity: 2085% (no condensing)
Measuring range: NTC probe: -40÷110°C.
Resolution: 0,1 °C; 1°F; 0.1bar; 1 PSI;
Accuracy (ambient temp. 25°C): ±0,7 °C ±1 digit

VC660 keyboard
Housing: self extinguishing ABS.
Case: facia 64x164 mm; depth 23mm
Mounting: panel mounting in a 56x72 mm panel cut-out with two screws.  3x2mm. Distance

between the holes 40mm

Protection: IP20; Frontal protection: IP65
Power supply: from XC645D power module, 12V, 100mA max, SELV, Limited Energy circuit

<15W

Display: : 4 digits red led and 4 digit orange led;
Optional output: buzzer

22. Parameters – Default values

Label

Value

Menù

Description

Range

StC1

-10.0

Pr1

Set point for compressors

LSE÷HSE

SEtF

30.0

Pr1

Set point for fans

LSF÷HSF

OA1

dGS

Pr2

Load 1 configuration

nu - CPr1 - CPr2 - StP - dGS - 6dG -

dGSt - InC1 - InC2 - FAn - InF - LIn – ALr –

Liq - HGi

OA2

CPr1

Pr2

Load 2 configuration

nu - CPr1 - CPr2 - StP - dGS - 6dG -

dGSt - InC1 - InC2 - FAn - InF - LIn – ALr –

Liq - HGi

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Label

Value

Menù

Description

Range

OA3

FAn

Pr2

Load 3 configuration

nu - CPr1 - CPr2 - StP - dGS - 6dG -

dGSt - InC1 - InC2 - FAn - InF - LIn – ALr –

Liq - HGi

OA4

FAn

Pr2

Load 4 configuration

nu - CPr1 - CPr2 - StP - dGS - 6dG -

dGSt - InC1 - InC2 - FAn - InF - LIn – ALr –

Liq - HGi

dGty

SCrL

Pr2

Kind of digital compressor : Scroll or Stream

SCrL - StrM

StP

oP

Pr2

Valve output polarity

OP - CL

FtyP

404

Pr2

Refrigerant gas type

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

Sty

yES

Pr2

Compressor rotation

no - yES

rot

yES

Pr2

Fan rotation

no - yES

P1C

Cur

Pr2

P1 probe setting (4/20mA, 0-5V, ntc)

nP - Cur - tEn - ntc

PA04

-0.5

Pr2

4mA or 0.5V readout for P1 probe

(-1.0 ÷ PA20)BAR; (-15 ÷ PA20)PSI; (-100 ÷

PA20)KPA

PA20

11.0

Pr2

20mA or 4.5V readout for P1 probe

(PA04 ÷ 61.0)BAR; (PA04 ÷

885)PSI; (PA04 ÷ 6100)KPA

CAL

0.0

Pr2

P1 probe offset

-12.0÷12.0(°C); -20÷20 (°F); 12.0÷12.0
(bar);

- 200÷200 (PSI) -999÷999 (kPA)

P2C

Cur

Pr2

P2 probe setting (4/20mA, 0-5V, ntc)

nP - Cur - tEn - ntc

FA04

0.0

Pr2

4mA or 0.5V readout for P2 probe

(-1.0 ÷ FA20)BAR; (-15 ÷ FA20)PSI; (-100 ÷

FA20)KPA

FA20

30.0

Pr2

20mA or 4.5V readout for P2 probe

(PA04 ÷ 61.0)BAR; (PA04 ÷

885)PSI; (PA04 ÷ 6100)KPA

FCAL

0.0

Pr2

P2 probe offset

-12.0÷12.0(°C); -20÷20 (°F); 12.0÷12.0
(bar);

- 200÷200 (PSI) -999÷999 (kPA)

P3C

nP

Pr2

P3 probe setting (4/20mA, 0-5V, ntc)

nP - Cur - tEn - nt10 - nt86

3P04

-0.5

Pr2

4mA or 0.5V readout for P3 probe

(-1.0 ÷ FA20)BAR; (-15 ÷ FA20)PSI; (-100 ÷

FA20)KPA

3P20

11.0

Pr2

20mA or 4.5V readout for P3 probe

(PA04 ÷ 61.0)BAR; (PA04 ÷

885)PSI; (PA04 ÷ 6100)KPA

O3

0.0

Pr2

P3 probe offset

-12.0÷12.0(°C); -20÷20 (°F); 12.0÷12.0
(bar);

- 200÷200 (PSI) -999÷999 (kPA)

P4C

nP

Pr2

P4 probe setting (NTC 10K, NTC 86K)

nP - nt10 - nt86

O4

0.0

Pr2

P4 probe offset

-12.0÷12.0(°C); -20÷20 (°F)

FPb

P2

Pr2

Probe setting for fan

nP - P1 - P2 - P3

iF01

oA1

Pr2

Configurable digital input 1 function
(terminals 13-14)

nu - OA1- OA2 - OA3 - OA4 - OA5 - OA6 ­InF - LP1 - LP2 - HP - ES - OFF - LL - SIL –
EAL – Co1 – Co2 – Co3 – Co4 – Co5 – Co6

iF02

oA2

Pr2

Configurable digital input 2 function
(terminals 13-15)

nu - OA1- OA2 - OA3 - OA4 - OA5 - OA6 ­InF - LP1 - LP2 - HP - ES - OFF - LL - SIL –
EAL – Co1 – Co2 – Co3 – Co4 – Co5 – Co6

iF03

oA3

Pr2

Configurable digital input 3 function
(terminals 16-17)

nu - OA1- OA2 - OA3 - OA4 - OA5 - OA6 ­InF - LP1 - LP2 - HP - ES - OFF - LL - SIL –
EAL – Co1 – Co2 – Co3 – Co4 – Co5 – Co6

iF04

oA4

Pr2

Configurable digital input 4 function
(terminals 16-18)

nu - OA1- OA2 - OA3 - OA4 - OA5 - OA6 ­InF - LP1 - LP2 - HP - ES - OFF - LL - SIL –
EAL – Co1 – Co2 – Co3 – Co4 – Co5 – Co6

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Label

Value

Menù

Description

Range

iF05

nu

Pr2

Configurable digital input 5 function
(terminals 19-20)

nu - OA1- OA2 - OA3 - OA4 - OA5 - OA6 ­InF - LP1 - LP2 - HP - ES - OFF - LL - SIL –
EAL – Co1 – Co2 – Co3 – Co4 – Co5 – Co6

iF07

ES

Pr2

Configurable digital input 7 function
(terminals 22-23)

nu - OA1- OA2 - OA3 - OA4 - OA5 - OA6 ­InF - LP1 - LP2 - HP - ES - OFF - LL - SIL –
EAL – Co1 – Co2 – Co3 – Co4 – Co5 – Co6

iF08

LL

Pr2

Configurable digital input 8 function
(terminals 22-24):

nu - OA1- OA2 - OA3 - OA4 - OA5 - OA6 ­InF - LP1 - LP2 - HP - ES - OFF - LL - SIL –
EAL – Co1 – Co2 – Co3 – Co4 – Co5 – Co6

iP01

cL

Pr2

Safety input for Load 1 polarity (13-14):

OP - CL

iP02

cL

Pr2

Safety input for Load 2 polarity (13-15):

OP - CL

iP03

cL

Pr2

Safety input for Load 3 polarity (16-17):

OP - CL

iP04

cL

Pr2

Safety input for Load 4 polarity (16-18):

OP - CL

iP05

cL

Pr2

Safety input for Load 5 polarity (19-20):

OP - CL

iP07

cL

Pr2

Configurable digital input i1F polarity (22-23):

OP - CL

iP08

cL

Pr2

Configurable digital input i2F polarity (22-24)

OP - CL

iP09

cL

Pr2

Polarity of High pressure-switch alarm
(terminals 45-46)

OP - CL

iP10

cL

Pr2

Polarity of Low pressure-switch alarm
(terminals 44-45)

OP - CL

d1d

0

Pr2

Dig. input set as oA1 or Co1 activation delay

0 ÷ 255 (sec)

d2d

0

Pr2

Dig. input set as oA2 or Co2 activation delay

0 ÷ 255 (sec)

d3d

0

Pr2

Dig. input set as oA3 or Co3 activation delay

0 ÷ 255 (sec)

d4d

0

Pr2

Dig. input set as oA4 or Co4 activation delay

0 ÷ 255 (sec)

did

20

Pr2

Liquid level alarm, signaling delay

0 ÷ 255 (min.)

didA

20

Pr2

External alarm, signaling delay:

0 ÷ 255 (min.)

ALMr

no

Pr2

Manual reset for compressor/fan alarms

no - yES

dEU

tPr

Pr2

Displaying measurement unit: pressure or
temperature

tMP - PrS

CF

°C

Pr2

Measurement unit for temperature

°C - °F

PMU

Bar

Pr2

Measurement unit for pressure

BAr - PSI - PA

rES

dE

Pr2

Resolution for display and parameters

in - dE

dFE

no

Pr2

Pressure filter enabling

no - yES

dEU1

tPr

Pr2

Upper display: pressure or temperature
selection

tMP - PrS

dSP2

P2

Pr2

Lower display default visualization

nu - P1 - P2 - P3 - P4 - StC1 - StC2 - SEtF

dEU2

tPr

Pr2

Lower display: pressure or temperature
selection

tMP - PrS

Pbd

5.0

Pr2

Proportional band for compressors regulation

0.1÷30.0(°C); 1÷50 (°F); 0.1÷10.0(BAR);
1÷150(PSI) 10÷1000(KPA)

rS

0.0

Pr2

Band offset

-12.0÷12.0(°C) -20÷20(°F) -

12.0÷12.0(BAR) -200÷ 200(PSI) ­999÷999(KPA)

inC

500

Pr2

Integral time

0 ÷ 999 sec

dGSP

no

Pr2

Digital compressor always activated as first
compressor

no - yES

SUt

2

Pr2

Digital input valve on at start up

0÷3s

tdS

15

Pr2

Cycle time for digital compressor

10÷40s

PM

30

Pr2

Minimum capacity for digital compressor

10÷PMA(dGty=ScrL) 0÷PMA(dGty=StrM)

PMA

100

Pr2

Maximum capacity for digital compressor

PM÷100

ton

60

Pr2

Time with digital compr. at PMA value before
starting a load

0÷255s

toF

30

Pr2

Time with digital compr. at PM before turning
off a load

0÷255s

MinP

0

Pr2

Minimum capacity threshold to start the
safety lubrication function

0÷100

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Label

Value

Menù

Description

Range

tMin

180

Pr2

Max time at MinP to start the safety
lubrication function

1÷255min

tMAS

3

Pr2

Time at PMA for digital compressor to restore
the right lubrication

1÷255min

ESC

0.0

Pr1

Energy saving for compressors regulation

-50.0÷50.0(°C) -90÷90(°F) -

20.0÷20.0(BAR) -300÷300(PSI) ­2000÷2000(KPA)

OnOn

5

Pr2

Minimum delay between 2 switching on of the
same compressor

0 ÷ 255 (min.)

OFOn

1

Pr2

Delay between the switching off and on of the
same compressor

0 ÷ 255 (min.)

don

01:00

Pr2

Time delay between the insertion of two
different loads

0 ÷ 99.5 (min.10sec)

doF

00:30

Pr2

Time delay between switching off of two
different compressors

0 ÷ 99.5 (min.10sec)

donF

1:00

Pr2

Minimum time a stage stays ON

0 ÷ 99.5 (min.10sec)

MAon

0

Pr2

Maximum time a stage stays switched ON

0 ÷ 24 (hour)

FdLy

no

Pr2

'don' delay enabled also for the first request

no - yES

FdLF

no

Pr2

'doF' delay enabled also for the first switching
off

no - yES

odo

20

Pr2

Regulation delay at power on

0 ÷ 255 (sec.)

LSE

-40.0

Pr2

Minimum set point (compressors)

-50.0÷HSE(°C) -58.0÷HSE(°F)
PA04÷HSE(BAR,PSI,KPA)

HSE

10.0

Pr2

Maximum set point (compressors)

LSE÷150.0(°C) LSE÷302(°F)
LSE÷PA20(BAR , PSI , KPA)

Lit

90.0

Pr2

Set point for liquid injection

0.0 ÷ 180.0°(°C) 32 ÷ 356(°F)

Lid

10.0

Pr2

Differential for liquid injection

0.1 ÷ 25.5° (°C) 1 ÷ 50° (°F)

LiPr

nP

Pr2

Probe selection for liquid injection

nP - P3 - P4

Pb

5.0

Pr2

Proportional band for fan regulation

0.1÷30.0(°C) 1÷50 (°F) 0.1÷10.0(BAR)
1÷150(PSI) 10÷1000(KPA)

ESF

0.0

Pr2

Energy saving differential for fan regulation

-50.0÷50.0(°C) -90÷90(°F) -

20.0÷20.0(BAR) -300÷300(PSI) ­2000÷2000(KPA)

PbES

0.0

Pr2

Band offset for fan regulation in ES

-50.0÷50.0(°C) -90÷90(°F) -

20.0÷20.0(BAR) -300÷300(PSI) ­2000÷2000(KPA)

Fon

30

Pr2

Time delay between the insertion of two
different fan

0 ÷ 255 (sec)

FoF

15

Pr2

Time delay between switching off of two
different fan

0 ÷ 255 (sec)

LSF

10.0

Pr2

Minimum set point (fan)

-50.0÷HSF(°C) -58.0÷HSF(°F)

FA04(FPb)÷HSF(BAR , PSI , KPA)

HSF

50.0

Pr2

Maximum set point (fan)

LSF÷150.0(°C) LSF÷302(°F) LSF÷FA20

(BAR , PSI , KPA)

PAO

30

Pr2

Alarm probe delay at power on

0 ÷ 255 (min.)

LAL

-40.0

Pr1

Pressure alarm set low limit (compressors)

-50.0÷HAL(°C); -58÷HAL(°F);
PA04÷HAL(BAR , PSI , KPA)

HAL

10.0

Pr1

Pressure alarm set high limit (compressors)

LAL÷150.0(°C); LAL÷302(°F);

LAL÷PA20(BAR , PSI , KPA)

tAo

15

Pr1

Pressure/temperature alarm delay
(compressors)

0 ÷ 255 (min.)

ELP

-45.0

Pr2

Electronic pressure switch threshold

-50.0÷STC1(°C) -58÷STC1(°F)
PA04÷STC1(BAR , PSI , KPA)

SEr

999

Pr2

Working hour alarm set (tenth of ours)

1 ÷ 999 (0= disabled) (10 hour)

PEn

5

Pr2

Pressure switch maximum activations

0 ÷ 15

PEI

60

Pr2

Pressure switch activations time

0 ÷ 255 (min.)

SPr

1

Pr2

Compressors ON with faulty probe

0 ÷ 6

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Label

Value

Menù

Description

Range

dtL

110.0

Pr2

DLT high temperature alarm threshold

0÷180°C 32÷356°F

dLd

5

Pr2

DLT high temperature alarm delay

0÷15min

dLH

15.0

Pr2

DLT high temperature alarm differential for
recovery

0.1÷25.5°C 1÷50°F

dtLi

nP

Pr2

Probe selection for DLT control

nP - P3 - P4

dtLP

50

Pr2

Digital Compressor Capacity percentage in
case of discharge line temperature alarm

0÷80(%)

LAF

0.0

Pr1

Low pressure alarm set (fan)

-50.0÷HAF(°C); -58÷HAF(°F);

FA04÷HAF(BAR , PSI , KPA)

HAF

60.0

Pr1

High pressure alarm set (fan)

LAF÷150.0(°C) LAF÷302(°F)

LAF÷FA20(BAR , PSI , KPA)

AFd

5

Pr2

Pressure alarm delay

0 ÷ 255 (min)

HFc

YES

Pr2

Compressor off with high pressure
(temperature) alarm

no - yES

HFdP

50

Pr2

Digital Compressor Capacity percentage in
case of high pressure (temperature) alarm

0÷80(%)

dHF

5

Pr2

Interval between 2 compressors turning off
with high pressure (temperature) alarm

1÷24 (sec.)

PnF

5

Pr2

Fan pressure switch maximum activations

0 ÷15

PiF

60

Pr2

Fan pressure switch activations time

0 ÷ 255 (min)

FPr

1

Pr2

Fan ON with faulty probe

0 ÷ 6

ASH0

5

Pr2

Differential for low superheat pre-alarm

0.1 to 30.0°C/ 1 to 60°F

ASH1

240

Pr2

Delay for signalling low superheat pre-alarm

0÷255 sec

ASH2

5

Pr2

Low suction superheat alarm threshold

0.1÷15.0°C/ 1÷30°F

ASH3

120

Pr2

Delay for signalling low superheat alarm

0÷255 sec

ASH4

no

Pr2

Switching off compressors with low superheat
alarm

No, Yes

ASH5

5

Pr2

Differential to restart regulation after of low
superheat alarm with compressor stop

0.1÷15.0°C/ 1÷30°F

ASH6

1

Pr2

Delay to restart regulation after superheat >
ASH2+ASH5

0÷255 min

ASH7

10

Pr2

Superheat value to enable hot gas injecting
valve

0.1÷30.0°C/ 1÷60°F

ASH8

2

Pr2

Differential for ASH7

0.1÷15.0°C/ 1÷30°F

ASH9

nP

Pr2

Probe selection for superheat monitoring

nP(0) - P3(1) - P4(2)

dSEP

nP

Pr2

Dynamic Set point function enabled

nP - P3 - P4

dSES

35.0

Pr2

External temperature set for DYNAMIC SET
POINT function

-50.0 ÷ 150.0 (°C) -58 ÷ 302 (°F)

dSEb

-20.0

Pr2

Proportional band DYNAMIC SET POINT

-50.0 ÷ 50.0(°C) -90 ÷ 90 (°F)

dSEd

5.0

Pr2

Differential for DYNAMIC SET POINT

-50.0÷50.0°C; -90÷90(°F) -20.0÷20.0(BAR)

-300÷300(PSI) -2000÷2000(KPA)

AOC

Cur

Pr2

Analogue output working mode

Cur – tEn

AOF

nu

Pr2

Analog output 1 function

nu - InC1 – InC2 – InF

AOP

nP

Pr2

Reference probe for the analog output 1

nP(0) - P3(1) - P4(2)

LAO

0

Pr2

Temperature value associated to minimum
value of analog output (AOM)

-50.0÷150.0(°C) -58÷302(°F)

UAO

100

Pr2

Temperature value associated to the
maximum value of analog output, 10V or
20mA

-50.0÷150.0(°C) -58÷302(°F)

AOM

40

Pr2

Minimum value of analogue output

0 ÷ 100 (%)

AOt

5

Pr2

Time with analog output at max when after
exceeding AOM

0÷15s

MPM

100

Pr2

Maximum % variation per minute

nu, 1 ÷ 100%

SAO

80

Pr2

Percentage of analog output in case of probe
failure

0 ÷ 100 (%)

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Label

Value

Menù

Description

Range

AOH

70

Pr2

Maximum analog output percentage when
silence mode function is enabled

0 ÷ 100 (%)

tbA

YES

Pr1

Alarm relay silencing

no – yES

OAP

cL

Pr2

Polarity alarm relay

OP – CL

oFF

no

Pr2

off function enabled

no – yES

bUr

YES

Pr2

Buzzer enabled

no – yES

Adr

1

Pr2

Serial address

1 ÷ 247

rEL

3.4

Pr2

Release firmware

Readable only

Ptb

Pr2

Parameter table code

Readable only

Pr2

-

Pr1

Pr2 access

Readable only