Emerson XC650C User Manual

XC650C

INDEX

1. GENERAL WARNING ........................................................................................................................................... 4

1.1 PLEASE READ BEFORE USING THIS MANUAL ............................................................................................................ 4

1.2 SAFETY PRECAUTIONS ........................................................................................................................................... 4

2. GENERAL DESCRIPTION .................................................................................................................................... 4

3. FIRST INSTALLATION ......................................................................................................................................... 4

3.1 HOW TO SET THE KIND OF GAS ............................................................................................................................... 4

3.2 HOW TO SET THE RANGE OF THE PRESSURE PROBES .............................................................................................. 5

3.3 HOW TO SET THE KIND OF DISPLAY: RELATIVE OR ABSOLUTE PRESSURE .................................................................. 5

4. USER INTERFACE ................................................................................................................................................ 6

4.1 DISPLAYING ........................................................................................................................................................... 6

4.2 KEYBOARD ............................................................................................................................................................ 6

4.3 ICONS .................................................................................................................................................................... 6

5. HOW TO SEE AND MODIFY THE SET POINT(S) ............................................................................................... 7

5.1 HOW TO SEE THE SET POINT OF COMPRESSORS AND/OR FANS ................................................................................ 7

5.2 HOW TO MODIFY THE SET POINT OF COMPRESSORS AND/OR FANS ........................................................................... 7

6. PARAMETERS PROGRAMMING ......................................................................................................................... 7

6.1 HOW TO ENTER THE “PR1” PARAMETER LIST ........................................................................................................... 7

6.2 HOW TO ENTER IN PARAMETERS LIST “PR2” ............................................................................................................ 8

6.3 HOW TO CHANGE PARAMETER VALUES ................................................................................................................... 8

7. HOW TO DISABLED AN OUTPUT ....................................................................................................................... 8

7.1 HOW TO DISABLED AN OUTPUT DURING A MAINTENANCE SESSION. ........................................................................... 8

7.2 OUTPUT DISABLED SIGNALLING............................................................................................................................... 8

7.3 REGULATION WITH SOME OUTPUTS DISABLED. ........................................................................................................ 8

8. RUNNING HOURS OF LOADS ............................................................................................................................. 9

8.1 HOW TO DISPLAY THE RUNNING HOURS OF A LOAD. ................................................................................................. 9

8.2 HOW TO RESET THE RUNNING HOURS OF A LOAD. ................................................................................................... 9

9. ALARM MENU ....................................................................................................................................................... 9

9.1 HOW TO SEE THE ALARMS ...................................................................................................................................... 9

10. USE OF THE PROGRAMMING “HOT KEY” ..................................................................................................... 9

10.1 HOW TO PROGRAM A HOT KEY FROM THE INSTRUMENT (UPLOAD) ....................................................................... 9

10.2 HOW TO PROGRAM AN INSTRUMENT USING A HOT KEY (DOWNLOAD) ................................................................. 9

11. KEYBOARD LOCKING..................................................................................................................................... 10

11.1 HOW TO LOCK THE KEYBOARD ........................................................................................................................... 10

11.2 TO UNLOCK THE KEYBOARD ............................................................................................................................... 10

12. LIST OF PARAMETERS ................................................................................................................................... 10

12.1 PLANT DIMENSIONING AND TYPE OF REGULATION. .............................................................................................. 10

12.2 PROBES CONFIGURATION .................................................................................................................................. 11

12.3 OTHERS INPUTS CONFIGURATION ....................................................................................................................... 12

12.4 DISPLAY AND MEASUREMENT UNIT ..................................................................................................................... 12

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12.5 COMPRESSORS REGULATION ............................................................................................................................. 13

12.6 FANS REGULATION ............................................................................................................................................ 13

12.7 ALARMS – COMPRESSOR SECTION ..................................................................................................................... 13

12.8 ALARMS – FANS SECTION ................................................................................................................................... 14

12.9 DYNAMIC SET POINT .......................................................................................................................................... 14

12.10 ANALOG OUTPUT (OPTIONAL) .......................................................................................................................... 14

12.11 OTHER ........................................................................................................................................................... 14

13. TYPE OF REGULATION .................................................................................................................................. 14

13.1 DEAD BAND – ONLY FOR COMPRESSORS ........................................................................................................... 14

13.2 PROPORTIONAL BAND – FOR COMPRESSORS AND FANS ..................................................................................... 15

14. MOUNTING & INSTALLATION ........................................................................................................................ 16

15. ELECTRICAL CONNECTIONS ........................................................................................................................ 17

15.1 PROBES CONNECTION ....................................................................................................................................... 17

16. RS485 SERIAL LINK ........................................................................................................................................ 17

17. TECHNICAL FEATURES ................................................................................................................................. 17

18. ALARM LIST ..................................................................................................................................................... 18

18.1 TYPES OF ALARMS AND SIGNALLING MANAGED ................................................................................................... 18

18.2 ALARM MOUTING ............................................................................................................................................... 20

18.3 ALARM CONDITIONS – SUMMARY TABLE .............................................................................................................. 20

19. WIRING CONNECTIONS .................................................................................................................................. 21

20. PARAMETERS – DEFAULT VALUES ............................................................................................................. 22

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1. GENERAL WARNING

1.1 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.

1.2 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.

2. GENERAL DESCRIPTION

The XC650C is designed to manage both compressors and fans in a condensing system such as a pack. The compressors can be simple, multistage or with different capacities. Control is by means of a neutral zone or proportional band and is based on the pressure or temperature sensed in the LP suction (compressors) and HP (condenser) circuits. A special algorithm balances the run hours of the compressors to distribute the work load uniformly. The controllers can convert both LP and HP pressures and display 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 XJ500, controlling and monitoring system, thanks to the serial TTL output, using the standard ModBus RTU protocol.

3. 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 6 Parameters programming and 12 will show in detail these operations.

3.1 HOW TO SET THE KIND OF GAS

The controller has memorised the relation between temperature and pressure for some gases.

The pre-set gas is: 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.

3. Select the FtyP, kind of gas, parameter.

4. Press the “SET” key: the value of the parameter will start blinking.

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5. Use “UP” or “DOWN” to change the gas amount the following: . Select the gas among the following: r22= R22;

r404=R404A; 507=R507; 134=134; r717= ammonia.

6. 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.

3.2 HOW TO SET THE RANGE OF THE PRESSURE PROBES

If an instrument with the following part number is used: XC650C – xxxxF, it is pre-set to work with pressure probe with the following range: Probe 1: -0.5 ÷11 bar (relative pressure); Probe 2: 0÷30 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 use the parameter:

PA04: Adjustment of read out corresponding to 4mA PA20: Adjustment of read out corresponding to 20mA

Practically these parameters has to be set with the start and end scale of the probe range.

WARNING: set a value correspondent to absolute pressure. If the transducer measures relative pressure increase the range of 1 bar.

E.I. PP11 relative pressure transducer, range -0.5÷11.0 bar. PA04=0.50; PA20=12.00. PP30 relative pressure transducer, range: 0÷30bar. PA04=1.00; PA20=31.00.

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.

3. Select the PA04, adjustment of read out corresponding to 4mA, parameter.

4. Press the “SET” key: the value of the parameter will start blinking.

5. Set the lower value of the probe range (lower value +1 if the probe detects relative pressure).

6. Push the SET key to confirm the value. The PA20: adjustment of read out corresponding to 20mA parameter will

be displayed.

7. Set the higher value of the range (higher value +1 if the probe detects relative pressure).

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.

3.3 HOW TO SET THE KIND OF DISPLAY: RELATIVE OR ABSOLUTE PRESSURE

After setting the probe range by means of the PA04, PA20, FA04 and FA20 parameters, it’s possible to select if the absolute

or relative pressure has to be displayed.

The controller is pre-set for RELATIVE PRESSURE displaying.

If the absolute pressure has to be displayed, 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.

1. Select by pushing the UP key the rELP parameter.

2. Push the SET to modify the value.

3. Set the AbS value and push the SET key to confirm it.

To exit: Press SET + UP or wait 30s without pressing a key.

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UPPER DISPLAY

LOWER DISPLAY

ICONS

1 probe enabled

Temperature

Pressure

- Working loads

- Measurement unit

- Alarm or status Icons

2 probes

enabled

Probe 1

Probe 2

- Working loads

- Measurement unit

- Alarm or status Icons

LED

FUNCTION

MEANING ON

Celsius degrees

Fahrenheit degrees

bar

bar displaying

PSI

PSI displaying

Load 1 on

Flashing

Load 1 is waiting to start (1HZ). or digital input alarm for Load 1 (2Hz). o Load 1 in maintenance status (2Hz).

Load 2 on

Flashing

Load 2 is waiting to start (1HZ). or digital input alarm for Load 2 (2Hz). o Load 2 in maintenance status (2Hz).

4. USER INTERFACE

4.1 DISPLAYING

4.2 KEYBOARD

SET To see or modify the set point. in programming mode it selects a parameter or confirm an operation. Alarm menu: By holding it pressed for 3s, the current alarm is erased.

o (UP) To enter the Alarm menu.

In programming mode: it browses the parameter codes or increases the displayed value. With Hot key inserted: it starts the Hot key programming procedure.

n (DOWN) 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.

CLOCK To display the loads running hours.

KEY COMBINATIONS

o + n

SET + n To enter the programming mode. SET + o To exit the programming mode.

4.3 ICONS

By holding it pressed for 3s the Maintaining menu is entered.

To lock and unlock the keyboard.

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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).

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).

Load 5 on

Flashing

Load 5 is waiting to start (1HZ). or digital input alarm for Load 5 (2Hz). o Load 5 in maintenance status (2Hz).

The Maintenance menu has been entered

Flashing

One or more loads have been placed in maintenance status

Alarm is happening

All the stored alarms have been seen.

Flashing

A new alarm has happened

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.

1) The Lower display will show the “SEtF” label, will the Upper display will show the fan set point.

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 memorise 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.

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.

5. HOW TO SEE AND MODIFY THE SET POINT(S)

5.1 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.

To exit: push the SET key or wait for 30 without pressing any keys.

5.2 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 freon (par. FtyP) and the default unit of measurement (par. dEU) for compressors and fans

PROCEDURE

1. Set the kind of freon by means of the FtyP parameter (see 3.1 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.).

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.

6. PARAMETERS PROGRAMMING

6.1 HOW TO ENTER THE “PR1” PARAMETER LIST

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1. Push the CLOCK key for 3 sec.

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 viceversa.

5. Push the SET key to confirm the status and pass to the next output.

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.

6.2 HOW TO ENTER IN PARAMETERS LIST “PR2”

The “Pr2” parameter list is protected by a security code (Password).

SECURITY CODE is 321

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.

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.

6.3 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.

7. HOW TO DISABLED AN OUTPUT

To disabled an output during a maintenance session means to exclude the output from the regulation.

7.1 HOW TO DISABLED AN OUTPUT DURING A MAINTENANCE SESSION.

To exit: push the CLOCK key or wait 30 sec.

7.2 OUTPUT DISABLED SIGNALLING.

If an output is disabled, its led will blink (2 Hz).

7.3 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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To see how long a load has been working follow this procedure:

1. Press and release the “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 .

1. Push the o 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.

8. RUNNING HOURS OF LOADS

8.1 HOW TO DISPLAY THE RUNNING HOURS OF A LOAD.

The controller memorises the running hours of each load.

To exit: push the CLOCK key or wait 30 sec.

8.2 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 2 sec, the controller reverts to display the running hours of the selected loads.

9. ALARM MENU

The controller memorises the last 20 alarms happened, together with their duration.. To see the alarm codes see par. par. 18 Alarm list.

9.1 HOW TO SEE THE ALARMS

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 10 sec.

10. USE OF THE PROGRAMMING “HOT KEY”

10.1 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.

10.2 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.

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1. Keep the o and n keys pressed together for more than 3 sec 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.

Plant with 3 compressors e 2 fans:

oA1 = CPr, oA2 = CPr, oA3 = CPr, oA4 = FAn, oA5 = FAn

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.

11. KEYBOARD LOCKING

11.1 HOW TO LOCK THE KEYBOARD

11.2 TO UNLOCK THE KEYBOARD

Keep the o and n keys pressed together for more than 3 sec till the “POn” flashing message appears.

12. LIST OF PARAMETERS

12.1 PLANT DIMENSIONING AND TYPE OF REGULATION.

oA1, oA2, oA3, oA4, oA5 Outputs 1-5 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) parameter can work as:

- Compressor: oAi = cPr,

- Step: oAi = StP

- Fan: oAi = FAn

- Alarm: oAi = ALr

- Not used: oAi = nu

NOTE: also the “Lin” value is present. This value must not be used.

According to the oA1÷oA5 configuration, 3 kinds of plant can be defined:

Rack with compressors only: all the oAi different from FAn Rack with fans only: all the oAi different from CPr of StP Rack with compressors and fans: both FAn and CPr are used for oAi.

COMPRESSORS CONFIGURATION

The regulation is always performed by the P1 Probe. With step compressors the output of compressor has to be set before the output of the step. ES. Compressor with 3 steps: oA1 = cPr, oA2= StP, oA2 = StP.

If an oAi set as step without any previous oAi set as cPr the configuration alarm “CStP” will be activated.

If compressor with different capacities are used (CtyP=dPo), all the oAi must to be configured as cPr (compressor) otherwise the configuration alarm “CStP” will be activated.

RACK WITH FANS ONLY

If none compressor is present, the regulation of the fans is performed through the P1 probe. If are present both compressors and fans (Cpr+Fan) the regulation of the fans is performed through the P2 probe.

In this case if the probe P2 is set not present (par. P2P=no) configuration alarm “AoP2” will be activated..

PLANT CONFIGURATION EXEMPLA:

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Plant with 1 compressor with 1 step, 1 compressor, and 2 fans:

oA1 = CPr, oA2 = StP (step of first compressor), oA3 = CPr, (second compressor) oA4 = FAn, oA5 = FAn

Plant with 1 compressor with 1 step and 3 fans:

oA1 = CPr, oA2 = StP (step of first compressor) oA3 = FAn, oA4 = FAn, oA5 = FAn

Kind of plant

Probe 1

- NTC/PTC: term. 4-5 //

- 4-20mA: term. 6(+), 5 (in)

Probe 2

- NTC/PTC: term. 4-7 //

- 4-20mA : term. 6(+), 7 (in)

Compressors and fans

Compressor regulation

Fan regulation

Compressors only

Compressor regulation

- Absent (P2P=no) or

- For Dynamic set point or

- For 4-20mA output (if present)

Fans only

Fans regulation

- Absent (P2P=no) or

- For Dynamic set point or

- For 4-20mA output (if present)

CtyP Compressor type: it sets if compressors have the same power (homogeneous) or not. dPo = compressor with different capacities: in this case the regulation is neutral zone. StP = homogeneous: the regulation can be neutral zone or proportional band. Scr = don’t set it StPP Valve outputs polarity: polarity of the outputs for capacity valves. It determines the state of the relays associated

with the capacity valves (only for homogeneous and stepped-capacity compressors) oP=valve enabled with open contact; cL= valve enabled with closed contact.

PC1..PC5 Power of compressor 1...5: for setting the power of single compressors. Available only if CtyP=dPo. The power

is identified by a value (range 1÷255) proportional to the capacity of single compressor. E.I. 3 compressors with following capacity: 10, 20, 40 HP. The parameters have to be set in this way: PC1=10, PC2=20, PC3=40.

FtyP Freon Type: set the kind of freon used in the plant r22=R22; r404=R404A; 507=R507; 134=134; r717=r717

(ammonia).

rTy: Type of regulation (see par. 13 Type of regulation): db=neutral zone; Pb=proportional band. CH Type of action: CL = cooling (direct action); Ht = heating (inverse action). with dead band regulation:

- if pressure/temperature is lower than regulation band, resources are activated.

- if pressure/temperature is bigger than regulation band, resources are deactivated.

with proportional band regulation:

- if pressure/temperature decreases crossing various bands, the resources are activated

- if pressure/temperature increases crossing various bands, the resources are deactivated rot Activation (type of sequence): YES=rotation, this algorithm distributes the working time between the various

loads to ensure even run times.

no=fixed sequence, the compressors are enabled and disabled in fixed sequence: first, second etc.

12.2 PROBES CONFIGURATION

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

12.2.1 Probe 1 configuration

Pbc Probe 1 setting: Cur=4 ÷ 20 mA probe; ntC=NTC probe, PtC=NTC probe.

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PA04 Adjustment of read out for the Probe 1: (used only if Pbc=Cur) corresponding to 4mA input signal, given by the

suction probe (0 ÷31 bar or 0÷450 PSI or 0÷3100KPA).

Warning: set a value correspondent to absolute pressure. If the transducer measures relative pressure increase

the range of 1 bar.

See also par. 3.2 How to set the range of the pressure probes Ex: PP11 relative pressure transducer, range -0.5÷12.0 bar. PA04=0.5 (-0.5+1); PA20=12.0 (11+1). PP30 relative pressure transducer, range: 0÷30bar. PA04=1; PA20=31. PA20 Adjustment of read out for the Probe 1: corresponding to 20mA input signal, given by the suction probe (0 ÷

31.0 bar or 0÷450 PSI or 0÷3100KPA)) SEE THE WARNING FOR PA04.

CAL Probe 1 calibration: -12.0÷12.0 bar; -12.0÷12.0°C or -20÷20 PSI/°F.

12.2.2 Probe 2 configuration

P2P Probe 2 presence: no=probe 2 absent; yES=probe 2 present. Pbc2 Probe 2 setting: Cur=4 ÷ 20 mA probe; ntC=NTC probe, PtC=NTC probe. FA04 Adjustment of read out for the Probe 2: (used only if Pbc2=Cur) corresponding to 4mA input signal, given by

the suction probe (0 ÷31 bar or 0÷450 PSI or 0÷3100KPA).

Warning: set a value correspondent to absolute pressure. If the transducer measures relative pressure increase

the range of 1 bar.

See also par. 3.2 How to set the range of the pressure probes Ex: PP11 relative pressure transducer, range -0.5÷12.0 bar. PA04=0.5 (-0.5+1); PA20=12.0 (11+1). PP30 relative pressure transducer, range: 0÷30bar. PA04=1; PA20=31. FA20 Adjustment of read out for the Probe 2: corresponding to 20mA input signal, given by the suction probe (0 ÷

31.0 bar or 0÷450 PSI or 0÷3100KPA)) SEE THE WARNING FOR PA04.

FCAL Probe 2 calibration: -12.0÷12.0 bar; -12.0÷12.0°C or -20÷20 PSI/°F.

12.3 OTHERS INPUTS CONFIGURATION

SEP Polarity of Low pressure-switch alarm: (terminals 9-10) oP =alarm with open contacts; cL= alarm with closed contact. HPP Polarity of High pressure-switch alarm: (terminals HP) oP = alarm with open contacts; cL= alarm with closed contact i1C Configurable digital input polarity: (terminals 3-4) oP=the digital input is activated by opening the contact;

CL=the digital input is activated by closing the contact.

i1F Configurable digital input polarity functions: (terminals 3 - 4) ES = Energy saving; oFF = instrument shut

down; LLi = liquid level alarm. did Configurable digital input delay: (enabled only if i1F=LL) 0÷255min. ALIP Alarm input for compressors and fans polarity: oP=the digital input is activated by opening the contact;

CL=the digital input is activated by closing the contact. 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.18.1.3 EA1÷EA5: Compressors and fans safeties

alarm.

12.4 DISPLAY AND MEASUREMENT UNIT

dEU Default measurement unit for displaying: bar=bar; °C=°C, PSI=PSI; °F=°F. NOTE1: The dEU parameter sets the measurement unit also for the set point and the following parameters: CAL,

FCAL, Pbd, ESC, LSE, HSE, Pb, ESF, LSF, HSF, LAL, HA, LAF, HAF. NOTE2: The controller automatically converts values of set point and following parameters CAL, FCAL, Pbd,

ESC, LSE, HSE, Pb, ESF, LSF, HSF, LAL, HA, LAF, HAF in the measurement unit set in dEU parameter. In any

case after modifying this parameter it’s better check and modify if necessary the set point and the above

parameters.

rES Resolution for °C and bar: in=integer; dE=decimal point. dSP2 Default visualisation of lower display: nu=not used; P1=probe one; P2=probe two; SET1; SET2. dEU2 Lower display probe format: PrS=Pressure; tPr=temperature. rELP Pressure displaying: AbS=absolute pressure; rEL=relative pressure. NOTE: In this case the pressure displayed, the set point and the following parameters LSE HSE, LSF and HSF

are automatically decreased by 1.0 bar or 14 PSI.

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12.5 COMPRESSORS REGULATION

Pbd Proportional band or neutral zone width: (0.10÷5.00bar/0.5÷30°C or 1÷80PSI/1÷50°F) the band (or zone) is

symmetrical compared to the target set point, with extremes: set+Pbd/2 ... set-Pbd/2. The measurement unit

depends on the dEU par.

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 activations 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 FdLy 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 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.

12.6 FANS REGULATION

Pb Proportional band zone width: (00.10÷5.00bar/0.5÷30°C or 1÷80PSI/1÷50°F). 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: set+Pb/2 ... set-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. 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. HSF Energy saving value for fans: (-20÷20bar; -50÷50°C) this value is add to the fans set point.

12.7 ALARMS – COMPRESSOR SECTION

PAo Alarm probe exclusion at power on: (0÷255 min) it is the period starting from instrument switch on, before an

alarm probe is signalled. 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.

It’s always subtracted to the set point. When the value SET-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.

It’s always added to the set point. When the value SET+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 signalling. Ser Service request: (1÷9990 hours, res. 10h) 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 17. Every time the pressure-switch is enabled all compressors 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÷#compr). PoPr Capacity engaged with faulty probe: (0÷100%) it’s used only if CtyP=dPo.

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12.8 ALARMS – FANS SECTION

LAF Low pressure alarm – fans section: the measurement unit depends on the dEU parameter. It’s always referred

to fan set point. When the value SETF-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. It’s always referred

to the set point. When the value SETF+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 signalling. 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 17. 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).

12.9 DYNAMIC SET POINT

dSEP Dynamic set point enabling: no = dynamic set point disabled; yES = dynamic set point enabled. WARNING the dynamic set point requires a dedicated probe, so it’s necessary that all the loads are the same

kind. (EI. fans).

dSES External temperature set point to start dynamic regulation: -50.0 ÷ 150.0 °C dSEb External band width for dynamic set point: -50.0 ÷ 50.0°C. dSEd Set point differential for dynamic set point: -20.0÷20.0bar; -50.0÷50.0°C.

12.10 ANALOG OUTPUT (OPTIONAL)

AOP Probe for analog output: nP = no probe; P1= Probe 1; P2= Probe 2 LAO Start of scale for analog output: (0.0÷51.0bar; -50.0÷150.0°C) it is the temperature (pressure) detected by the

probe which is associated the 4mA value. UAO End of scale for analog output: (0.0÷51.0bar; -50.0÷150.0°C) it is the temperature (pressure) detected by the

probe which is associated the 20mA value.

AOM Minimum value for analog output: 4 ÷ 20mA. SAO Percentage of analog output in case of probe failure: 0 ÷ 100%.

12.11 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 4 sec. Ad1 Compressors address: (1–247) it is used in monitoring system. Ad2 Fans address: (1–247) it is used in monitoring system. Ptb Parameter table code: readable only. rEL Software release for internal use.

13. TYPE OF REGULATION

13.1 DEAD BAND – ONLY FOR COMPRESSORS

This kind of regulation is available only for compressors. The neutral zone (Pbd) is symmetrical compared to the target set point, with extremes: set+Pbd/2 ... set-Pbd/2. If the pressure (temperature) is inside this zone the controller maintains the same number of loads switched on and off, without changing anything. When the pressure (temperature) go out from the zone, regulation starts. If the pressure is greater than SET+Pbd/2, the loads are switching on with timing given by parameters: don and doF. A load is turned on only if his safety times onon, oFon, donF are over. Regulation stops when the pressure (temperature) comes back into the neutral zone.

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Set

Compressor

Status

Time

Pressure

Compressor inserction area

neutral zone

don

doF

don

doF

don

Delay

functioning

Time

Set + (Pbd/2)

Set - (Pbd/2)

Compressor disconnection area

In the following a simplify exemplum that explains the regulation in neutral zone for compressor homogeneous with 1 step for each compressors. The safety times onon, oFon and donF are not considered. In the real regulation any load is entered or turned off only if these times are over.

Ex. Dead band control, compressors with same capacities, 1 step for each compressor. In this example:

oA1 = cPr; oA2 = cPr; oA3 = cPr; oA4 =nu; oA5 = nu number of compressors CtyP = SPo homogeneous compressors; rty = db dead band regulation Sty = yES rotation FdLy = no “don” delay not enabled at first calling after an equilibrium condition. dLF = no “doF” delay not enabled at first calling after an equilibrium condition.

13.2 PROPORTIONAL BAND – FOR COMPRESSORS AND FANS

The regulation band (Pbd) is divided into as many parts as there are stages according to the following formula:

# step = oAi = CPr or StP (number of compr. or steps).

The numbers of stages 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 compressors are on, if the pressure (temperature) is low er than the regulation band all the compressors are off. Naturally also for this regulations all the delays (don and doF) safety times (onon, oFon and donF) are valid.

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 oA1 = cPr; oA2 = cPr; oA3 = cPr; oA4 = cPr: 4 compressors

CtyP = SPo homogeneous compressors. rty = Pb proportional band regulation

Sty = yES rotation FdLy = no “don” delay at first call not enabled.

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dLF= no “doF” delay at first call not enabled.

SET

Set+Pbd/2

Set-Pbd/2

ZIC

Set+Pbd/4

Set-Pbd/4

don

doF

ALL LOADS ON

ALL LOADS OFF

This draw highlights the doF time: the loads are in fact turned off only when the doF time is over.

14. MOUNTING & INSTALLATION

The instruments are suitable only for internal use. Instruments shall be mounted on panel, in a 29x71 mm hole, and fixed using the special brackets supplied. To obtain an IP65 protection grade use the front panel rubber gasket (mod. RG-C) as shown in figure. The ambient operating temperature range is between 0÷60°C. Avoid locations subject to heavy vibration, corrosive gases or excessive dirt. The same applies to the probes. Ensure ventilation around the instrument.

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Figure 1

15. ELECTRICAL CONNECTIONS

The controller is provided with removable terminal blocks for wires having section not bigger than 1.0 mm2: 14 ways for analogue and digital inputs, 12 ways for relays

Note: terminals 17-19 are connected inside the controller, they are the common for the “relay n°1” with terminal 15 and “relay n°2” with terminal 16 Terminals 21-22 are connected inside the controller, they are the common for the “relay n°3 ” with terminal 18 and “relay n°4” with terminal 20.

A 5-ways connector is dedicated to the TTL / RS485 interface.

Four connectors having 2-way for 0.2 mm2 wires are dedicated to: HP digital input, 12Vdc open collector alarm, LP digital input, 4..20mA analogue output.

Check power supply data before connection wires. Keep the probe and the digital input wires separate from the power cable.

Do not exceed the maximum rating current for each relay, check technical data and if the load is bigger, use filtered contactors. Before connecting cables make sure the power supply complies with the instrument’s requirements. Separate the input connection cables from the power supply cables, from the outputs and the power connections. Do not exceed the

maximum current allowed on each relay, in case of heavier loads use a suitable external relay.

15.1 PROBES CONNECTION

Pressure probe (4 - 20 mA): respect the polarity. If using terminal ends be sure there are no bear parts which could cause

short circuiting or introduce noise disturbance at high frequencies. To minimise 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.

16. RS485 SERIAL LINK

All models can be integrated into the monitoring and alarm system XJ500 using the TTL serial port. They use the standard ModBus RTU protocol, so they can be fitted in a system integrator using this protocol.

The controller has 2 serial addresses first one Ad1 for compressor section, second one Ad2 for fan section. To completely monitor both sections the values of the 2 addresses have to be different. If the Ad2 parameters have the same value the status of the fans is not monitored.

17. TECHNICAL FEATURES

Housing: Self extinguishing ABS. Case: Front panel 32x74 mm, depth 60mm (“C” format); Mounting: “C” format panel mounting in a 29x71 mm panel cut-out Protection: IP65. Frontal protection: IP65 with frontal gasket mod RG-C model.

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OA1  OA5

Outputs 1- 5 configuration

P2P

Second probe presence.

CtyP

Compressor type

dSEP

Dynamic set point enabling

AOP

Probe for analog output

tOP

Probe for triac output

Mess.

Errata

Corrige

nLod

Number of loads higher than loads available in the controller

 Check number of oAi set as load, this number has to be

lower of equal to the number of relay of the controller.

cStP

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

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.

dSP2

P2 probe not available for the dynamic set point function

 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.

Connections: Removable terminal block 12 and 14 ways; Power supply: 12Vac/dc  10%, 24Vac/dc  10%, 50-60Hz. Power absorption: 5VA max. Display: 3-digit red led and 4-digit orange led. Inputs: 2 NTC probes, or 2 PTC probes and 2 4..20mA transducer. Digital inputs: 5 free voltage inputs Relay outputs: 5 relay SPST 5(3)A, 250Vac Open collector: alarm output: 12V, 40mA. Analogue output: 4..20mA for fan control, trigger for fan control Serial output: TTL standard Communication protocol: ModBus – RTU Data storing: on the non-volatile memory (EEPROM). Kind of action: 1B; Pollution degree: normal; Software class: A. Operating temperature: 0÷60°C; Storage temperature: -25÷60°C. Relative humidity: 2085% (no condensing) Measuring range: NTC probe: -40÷110°C. Resolution: 0.1°C or 1°C; Accuracy (ambient temp. 25°C): ±0,7°C ±1 digit

18. ALARM LIST

Usually alarm conditions are signalled 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 18.3

18.1 TYPES OF ALARMS AND SIGNALLING MANAGED

18.1.1 A12: Configuration alarm

The following configuration parameters are checked after each modification.:

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 signals what wrong setting has created the error. The following table contains the displayed messages:

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FAP2

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.

CSP2

P2 probe not available for screw compressor

 Check CtyP and set it different from Scr.

P2CF

Wrong second probe configuration (EI.: If Cty= Scr P2 ha to be PTC)

 Set P2P = yES and PbC2 = PTC

18.1.2 E0H, E0L Pressure switch alarm, suction and condensing sections

Terminals

Low pressure switch input: 9-10, high pressure switch input: HP.

Parameters SEP: Low pressure switch polarity: It establishes if the input is activated by closing (SEP=cL) or by opening (SEP=oP) the

terminals. HPP: High pressure switch polarity: It establishes if the input is activated by closing (HPP=cL) or by opening (HPP=oP) the terminals.

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

standard operating mode when the input is disabled. If there are PEn activations in the PEi time, only manual resetting is allowed, by pressing the DOWN key for 3 sec 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 restarts the standard operating mode when the input is disabled. If there are PnF activations in the PiF time, only manual resetting is allowed, by pressing the DOWN key for 3 sec or by turning off and on the instrument.

18.1.3 EA1÷EA5: Compressors and fans safeties alarm.

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

The terminals (from 10, 11, 12, 13, 14+ ID5) 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 ALIP: It establishes if the input is activated by closing (ALIP=cL) or by opening (ALIP=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.

18.1.4 P1, P2: probe failure alarm

It is generated by failure in the probe P1 or P2.

If both compressors and fans are managed by the instrument SPr: number of steps engaged with faulty probe. (0÷# oAi = cPr or StP) It’s used only if CtyP=StP. PoPr: capacity engaged with faulty probe (0÷255) It’s used only if CtyP=dPo. FPr: Number of fans engaged with faulty probe. (0÷# oAi = FAn)

If the second probe is used for dynamic set point

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

If the second probe is used for analog output

The function is disabled, the value of the analog output is set in the SAo parameter.

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Code

Description

Cause

Action

Reset

E0L

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 compressors

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.

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 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.

Recovery

Automatic as soon as probe restarts working.

18.1.5 HA, LA, HA2, LA2High and low pressure (temperature) alarms

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 signalling.

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

18.2 ALARM MOUTING

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

18.3 ALARM CONDITIONS – SUMMARY TABLE

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Code

Description

Cause

Action

Reset

EA1 EA2 EA3 EA4 EA5

Load safeties alarm

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

 the corresponding

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

Minimum pressure (temperature) alarm compressors section

Suction pressure or temperature lower than SET_C-LAL value

 signalling only

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

LA2

Minimum pressure (temperature) alarm fans section

Condensing pressure or temperature lower than SET_F-LAL value

 signalling only

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

Maximum pressure (temperature) alarm compressors section

Suction pressure or temperature higher than SET_C+HAL value

 signalling only

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

HA2

Maximum pressure (temperature) alarm fans section

Condensing pressure or temperature higher than SET_F+HAL value

 signalling only

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

Liquid level alarm

Input enabled

 signalling only

Automatically as soon as the input is disabled

A14

Load maintenance alarm

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

- signalling only

Manually: reset the running hour of the compressor (see par.8 Running hours of loads)

19. WIRING CONNECTIONS

Probe connections: 4-20mA probe: P1 = 5(-) – 6(+); P2 = 7(-) – 6(+); PTC/NTC probe: P1 = 5 – 4; P2 = 7 – 4 NOTE: analog output is optional.

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Name

°C

°F

bar

PSI

Level

Description

Range

SEtc

-18,0 0 2,3

Set point for compressors

LSE ÷ HSE

SEtF

35,0

15,1

220

Set point for fans

LSF ÷ HSF

oA1

CPr

Pr2

Outputs 1 configuration