Emerson XM670, XM679 Operation Manual

XM670-XM679 Controllers for Multiplexed Cabinets Installation and Operation Manual

026-1218 Rev 4

Emerson Commercial and Residential Solutions

1065 Big Shanty Road NW, Suite 100

Kennesaw, GA 30144 USA

770-425-2724 • 1-800-829-2724

www.emerson.com

Contents

1 INTRODUCTION.......................................................................................................................................................... 1

1.1. G

ENERAL WARNING ..................................................................................................................................................... 1

2 OVERVIEW ................................................................................................................................................................... 1

2.1. G

ENERAL DESCRIPTION................................................................................................................................................ 1

2.2. O

RDERING CODES......................................................................................................................................................... 2

3 USER INTERFACE ...................................................................................................................................................... 2

3.1. K

EYS AND FUNCTIONS ................................................................................................................................................. 2

3.2. U

SE OF LEDS ............................................................................................................................................................... 3

3.3. H

OW TO ENTER THE FAST ACCESS MENU ................................................................................................................... 3

3.4. H

OW TO SEE THE MAX AND MIN TEMPERATURE RECORDED ................................................................................... 3

3.5. H

OW TO SEE AND MODIFY THE SETPOINT................................................................................................................... 3

3.6. H

OW TO START A MANUAL DEFROST.......................................................................................................................... 3

3.7. H

OW TO ENTER THE PARAMETERS LIST PR1 .............................................................................................................. 3

3.8. H

OW TO ENTER THE PARAMETERS LIST PR2 .............................................................................................................. 4

3.9. H

OW TO ASSIGN A MODBUS ADDRESS ..................................................................................................................... 4

3.10. H

3.11. ON/OFF F

4 FAST ACCESS MENU ................................................................................................................................................. 5

OW TO CHANGE THE PARAMETER VALUE............................................................................................................... 4

UNCTION.................................................................................................................................................... 4

5 SECTION MENU .......................................................................................................................................................... 6

5.1. T

O SET ENERGY SAVING TIMES................................................................................................................................... 6

5.2. T

O SET TIMED DEFROST PARAMETERS ........................................................................................................................ 6

6 ELECTRONIC EXPANSION VALVE MENU (FOR MODEL XM679 ONLY).................................................... 7

7 CONTROLLING LOADS ............................................................................................................................................ 7

7.1. S

OLENOID VALVE ......................................................................................................................................................... 7

7.2. S

TANDARDS REGULATION AND CONTINUOUS REGULATION ....................................................................................... 7

7.2.1. First Kind of Regulation: Standard Regulation.................................................................................................... 8

7.2.2. Second Kind of Regulation: Continuous Regulation (For Model XM679 Only).................................................. 8

7.3. D

EFROST ....................................................................................................................................................................... 8

7.3.1. Defrost starting..................................................................................................................................................... 8

7.3.2. Defrost Ending...................................................................................................................................................... 8

7.4. F

ANS ............................................................................................................................................................................. 9

7.4.1. Control With Relay................................................................................................................................................ 9

7.4.2. Control With Analog Output (If Present).............................................................................................................. 9

7.5. A

NTI-SWEAT HEATERS (IF PRESENT)........................................................................................................................... 9

7.6. A

UXILIARY OUTPUT ..................................................................................................................................................... 9

8 PARAMETERS LIST.................................................................................................................................................. 10

9 DIGITAL INPUTS....................................................................................................................................................... 19

9.1. G

ENERIC ALARM (EAL)............................................................................................................................................. 19

9.2. S

ERIOUS ALARM MODE (BAL)................................................................................................................................... 19

9.3. P

RESSURE SWITCH (PAL) .......................................................................................................................................... 19

9.4. D

OOR SWITCH INPUT (DOR) ....................................................................................................................................... 19

9.5. S

TART DEFROST (DEF)............................................................................................................................................... 19

9.6. R

ELAY AUX ACTUATION (AUS) ................................................................................................................................ 19

Table of Contents • 5

9.7. RELAY LIGHT ACTUATION (LIG) ............................................................................................................................... 19

9.8. R

EMOTE ON/OFF (ONF) ............................................................................................................................................ 19

9.9. K

IND OF ACTION (HTR) .............................................................................................................................................. 19

9.10. FHU (N

9.11. E

9.12. C

9.13. D

OT USED) ..................................................................................................................................................... 19

NERGY SAVING INPUT (ES).................................................................................................................................... 19

ONFIGURABLE INPUT - HOLIDAY FUNCTION (HDY).............................................................................................. 20

IGITAL INPUTS POLARITY....................................................................................................................................... 20

10 INSTALLATION AND MOUNTING...................................................................................................................... 20

11 ELECTRICAL CONNECTIONS............................................................................................................................. 21

11.1. P

ROBE CONNECTIONS ............................................................................................................................................... 21

12 RS485 SERIAL LINE ................................................................................................................................................ 21

13 HOW TO USE THE HOT KEY ............................................................................................................................... 21

13.1. D

13.2. U

OWNLOAD (FROM THE HOTKEY TO THE DEVICE).................................................................................................. 21

PLOAD (FROM THE DEVICE TO THE HOTKEY) ....................................................................................................... 22

14 ALARM SIGNALS ................................................................................................................................................... 23

14.1. EE A

14.2. A

LARM................................................................................................................................................................ 24

LARM RECOVERY ................................................................................................................................................... 24

15 TECHNICAL DATA ................................................................................................................................................. 25

16 UL RATINGS ............................................................................................................................................................. 26

17 CONNECTIONS ........................................................................................................................................................ 27

17.1. E2

TO XM DEVICE COMMUNICATION RECOMMENDATIONS .................................................................................... 27

17.1.1. Wiring Guidelines ............................................................................................................................................. 27

17.2. XM670 - W

17.3. XM679 - 230VAC V

17.4. XM679 - 24VAC V

IRING DIAGRAM..................................................................................................................................... 27

ALVES/WIRING DIAGRAM....................................................................................................... 28

ALVES/WIRING DIAGRAM ......................................................................................................... 28

18 E2 MODBUS NETWORK WIRING ....................................................................................................................... 29

19 WIRING LAYOUT FOR SHARING A PRESSURE TRANSDUCER ON A LAN ............................................ 30

20 PRESSURE TRANSDUCER SETUP (XM679 ONLY) ......................................................................................... 31

20.1. RS485 N

ET MONITORING TEMPERATURES ............................................................................................................. 31

20.1.1. RS485 Connection............................................................................................................................................. 31

20.2. H

OW TO ENABLE A PRESSURE PROBE TO SHARE ACROSS THE LAN ...................................................................... 32

21 WIRING CONNECTION TO SITE SUPERVISOR.............................................................................................. 33

22 ECT MODBUS NETWORKING TO E2S............................................................................................................... 34

22.1. COM P

22.2. COM P

22.3. E2 S

ORT ASSOCIATIONS - E2 VERSIONS 3.XX AND BELOW ................................................................................ 34

ORT ASSOCIATIONS - E2 VERSIONS 4.0 AND ABOVE ................................................................................... 34

ETUP OF DEVICES .............................................................................................................................................. 35

22.3.1. Set Up Network Ports........................................................................................................................................ 35

22.3.2. Add and Connect the Device..................................................... ..................................... ................................... 35

22.4. W

22.5. MODBUS T

IRING TYPES .......................................................................................................................................................... 37

ERMINATION BLOCKS ........................................................................................................................... 37

23 DEFAULT SETTING VALUES............................................................................................................................... 38

TABLE 23-1 APPENDIX A - ALTERNATE MODBUS COM WIRING METHOD FOR E2, XR, XM, AND XEV

DEVICES ........................................................................................................................................................................... 45

6 • XM679K I&O Manual 026-1218 Rev 4

1 Introduction

2Overview

1.1. General Warning

Please read the following safety precautions and warnings before using this manual:

CAUTION!

• This manual is part of the product and should be kept near the device for easy and

quick reference.

• The device should not be used for purposes different from those described in this manual. It cannot be used as a safety device.

• Check the application limits before proceeding.

SAFETY PRECAUTIONS AND WARNINGS!

• Check that the supply voltage is correct

before connecting the device.

• Do not expose to water or moisture: use the controller only within the operating limits and avoid sudden temperature changes with high atmospheric humidity to prevent condensation from forming.

• Warning! Disconnect all electrical connections before performing any kind of maintenance.

• Fit the probe where it is not accessible by the end user. The device must not be opened.

• In case of failure or faulty operation, send the device back to the distributor or to Emerson (see address) with a detailed description of the fault.

• Verify the maximum current that can be applied to each relay (see Section 15, 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.

• In case of applications in industrial environments, the use of main filters in parallel with inductive loads could be useful.



2.1. How to Check the Software Release of the XM679K

1. Check the software release of the XM679K printed on the label of the  controller.

Figure 2-1 - XM679K Software Release

2.2. General Description

Models XM670-XM679 are high level microprocessor based controllers for multiplexed cabinets, suitable for applications on medium or low temperature. It can be inserted in a Local Area Connection (LAN) of up to eight (8) different sections that can operate depending on the programming, as stand alone controllers or by following the commands coming from the other sections.

XM670/XM679 controllers can have six (6) relay outputs to control the solenoid valve, defrost that can be either electrical or hot gas, evaporator fans, lights, auxiliary output, alarm output and an output to drive pulsed electronic expansion valves (applicable for XM679 only).

The controllers can also have up to four (4) probe inputs: the first one for temperature control, the second for defrost end temperature control of the evaporator, the third for the display, and the fourth probe input can be used for applications with virtual probe or for inlet/outlet air temperature measurement. Model XM679 can exclusively have two (2) other probes that can be used for superheat measurement and regulation. Both XM670 and XM679 controllers

General Warning Introduction • 1

are also equipped with three digital inputs (free contact) that are fully configurable through parameters.

The Hot Key connector allows simple programming of the controllers.

Direct serial output RS485 MODBUS-RTU compatible permits a simple XWEB interfacing. Depending on the model, the Hot Key connector can also be used to connect X-REP display.

2.3. Ordering Codes

Device

Name

XM670

XM679

Table 2-1 - Product Ordering Codes

Description

Solenoid Case Control

Pulse Case Control

Emerson

Part

Number

318-6520

318-6521

318-6700

318-6701

2 • XM679K I&O Manual 026-1218 Rev 4

3 User Interface

Measurement unit

Key Combinations

Locks/Unlocks the keyboard

Switches mode to programming mode

Exits the programming mode

Figure 3-1 - XM670 - XM679 Front Panel

3.1. Keys and Functions

Table 3-1 lists the keys that are found on the front

panel of XM670-XM679 controllers and the function of each:

Key Function

Press to display the target setpoint, to

select a parameter in programming mode,

or to confirm an operation. Pressing this

key for three (3) seconds while the

minimum or maximum temperature is

displayed will erase the temperature

currently displayed.

Press this key to browse the parameter

codes in programming mode or increases

the displayed value. Pressing this key for

three (3) seconds will give you access to

the Section menu.

Press this key to access the fast access

menu, browse the parameter codes in

programming mode, decrease the

displayed value, or activate or deactivate

an auxiliary output.

Starts a defrost when pressed for three (3)

seconds.

Switches the room light ON and OFF.

Press for three (3) seconds to switch the

device ON and OFF.

Table 3-1 - XM670/XM679 Front Panel Keys and Functions (Continued)

3.2. Use of LEDS

Each LED function is described in Table 3-2:

LED Mode Function

Compressor and valve regulation

Flashing Anti-short cycle delay enabled

ON Defrost enabled

Flashing Drip time in progress

ON An alarm is occurring

ON Energy saving enabled

ON Fans enabled (fans are running)

Flashing Door opened or delay after defrost

ON Auxiliary relay ON

ON Measurement unit

Flashing Programming phase

Flashing

enabled. percentage, enter the fast access menu.

The controller is ALL mode

The controller is remote virtual display mode

During the CLOCK modification (if clock is presen

To see the valve opening

working in 

working in

Table 3-1 - XM670

Keys and Functions User Interface • 3

/XM679 Front Panel Keys and Functions

Table 3-2 - LEDs

3.3. How to Enter the Fast

Access Menu

1. Press and release the UP button.

2. The First Label will be displayed. Press the UP or DOWN button to navigate the menu.

1. Enter the programming mode by pressing the SET and DOWN buttons for a few seconds (wait for the measurement unit to start blinking).

2. The controller will show the first parameter present in Pr1.

3.8. How to Enter the Parameters List PR2

3.4. How to See the MAX and MIN Temperature Recorded

1. Press and release the UP button.

2. The First Label will be displayed. Press the UP or DOWN button to navigate the menu. Search the L°t label and press SET to see minimum temperature; search the H°t label and press SET to see maximum temperature.

3.5. How to See and Modify the Setpoint

1. Press the SET button for three (3) seconds to show the setpoint value.

2. The measurement unit starts blinking.

3. To change the setpoint value, press the UP or DOWN button for 10 seconds.

4. To store the new setpoint value, press the SET key again or wait 10 seconds.

To access the parameter list in Pr2:

1. Enter the Pr1 lev el . F ol lo w t he st ep s i n Section 3.7.,

How to Enter the Parameters List PR1.

2. Select Pr2 parameter and press the SET key.

3. The PAS flashing message will display, followed shortly by “0 --” with a flashing zero.

4. Use the UP or DOWN button to input the security code in the flashing digit. Confirm the security code by pressing SET. The security code is 321.

5. If the security code is correct, the access to Pr2 is enabled by pressing SET on the last digit.

3.6. How to Start a Manual Defrost

Press the DEF key for more than three (3) seconds to start a manual defrost.

3.7. How to Enter the

Figure 3-2 - Parameters List 2

Another way to enter the programming mode is by pressing the SET and DOWN buttons for 30 seconds immediately after switching the controller ON.

NOTE: Each parameter in Pr2 can be removed or put into Pr1 (user level) by pressing SET + DOWN buttons. When a parameter is present in Pr1, the Alarm LED will be display.

Parameters List PR1

To enter the parameter list in Pr1 (user accessible parameters):

4 • XM679K I&O Manual 026-1218 Rev 4

3.9. How to Assign a MODBUS Address

1. To enter the programming mode, press and hold the SET and DOWN buttons together until the temperature measurements start blinking.

2. Scroll through the parameters using the UP or DOWN button until Adr is displayed.

3. Press and hold SET to select Adr.

4. Use the arrow keys to choose the address number of the device.

5. Press and hold SET again to select the desired number and save.

6. To exit, press the SET and UP arrow keys together.

3.10.How to Change the Parameter Value

1. Enter the programming mode.

2. Select the required parameter using the UP or DOWN button.

3. Press the SET key to display the parameter value (measurement unit starts blinking).

4. Use the UP or DOWN button to change the value.

5. Press SET to store the new value and move to the next parameter.

6. To exit, press SET + UP keys or wait 15 seconds without pressing a key.

NOTE: During the OFF status, the Light and AUX buttons are active.

NOTE: The set value is stored even when the time-out expires and ends the procedure.

3.11.ON/OFF Function

By pressing the ON/OFF key, the controller shows OFF. During the OFF status, all the relays are switched OFF

and the regulations are stopped; if a monitoring system is connected, it does not record the controller data and alarms.

How to Assign a MODBUS Address User Interface • 5

4 Fast Access Menu

This menu contains the lists probes and some values that are automatically evacuated by the board, such as the superheat and the percentage of valve opening. The values below stands for:

• nP or noP - probe not present or value not evacuate

• Err - value out of range, probe damaged, not connected or incorrectly configured

FAST ACESS MENU

HM Fast Access Menu to Clock Settings (If present)

SH Superheat Shows the actual superheat value (Only XM679)

oPP Valve opening percentage Shows the actual opening percentage of the valve (Only XM679)

dP1 Probe 1 value displaying Shows the temperature measured by probe 1

dP2 Probe 2 value displaying Shows the temperature measured by probe 2

dP3 Probe 3 value displaying Shows the temperature measured by probe 3

dP4 Probe 4 value displaying Shows the temperature measured by probe 4

dP5 Probe 5 value displaying Shows the temperature measured by probe 5

dP6 Probe 6 value displaying Shows the temperature measured by probe 6

dPP Pressure probe value

rPP Remote pressure probe value

L°t Minimum measured temperature Shows the minimum temperature read by the regulation probe

H°t Maximum measured temperature Shows the maximum temperature read by the regulation probe

dPr Virtual regulation probe value Shows the value measured by the virtual regulation probe

dPd Virtual defrost probe value Shows the value measured by the virtual defrost probe

dPF Virtual fans probe value Shows the value measured by virtual fan probe

rSE Real setpoint

Fast Access to Analog Output Reading

(If present)

Shows the value of pressure measured by pressure transducer  (Only XM679)

Shows the value of pressure received by remote pressure probe connected to other XM600 device (Only XM679)

Shows the setpoint used during the energy saving cycle or during the continuous cycle

Table 4-1 - Fast Access Menu

6 • XM679K I&O Manual 026-1218 Rev 4

5 Section Menu

This menu allows the user to access to a particular feature of the XM series related to the LAN (Local Area Network) of controllers. Depending on the programming of this menu, a single keyboard can control either the module of the local section of the LAN or ALL. The possibilities are: LOC: the keyboard controls and display the value, the status, and the alarms of the local section of the LAN; and ALL: the command given by the keyboard are effective on all the sections of the LAN.

1. Press the UP key for more than three (3) seconds.

2. The label corresponding to the section controlled by the keyboard will be displayed.

3. Using the UP or DOWN key, select the section you want to control.

4. Press the SET key to confirm and exit.

5.1. To Set Energy Saving Times

ILE Energy Saving cycle

dLE Energy Saving cycle

ISE Energy Saving cycle

dSE Energy Saving cycle

HES Temperature 

Table 5-1 - Energy Saving Times Parameters

start during  workdays

ength during 

workdays

start on ho

ength on holidays

increase during the Ener

lidays

gy Saving cycle

(0 to 23 h 50 min) During the Energy Saving cycle, the setpoint is increased by the value in HES so that the operation setpoint is SET + HES.

(0 to 24 h 00 min) Sets the duration of the Energy Saving cycle on workdays.

(0 to 23h 50 min)

(0 o 24h 00 min)

(-54 to 54°F/ -30 to

°C) Sets the

30 increasing value of the setpoint during the Energy Saving cycle.

5.2. To Set Timed Defrost Parameters

Ld1

Workday

defrost start

Ld6

Sd1

Holiday 

defrost start

Table 5-2 - Timed Defrost Parameters

NOTE: To disable a defrost cycle, set it to nu (not used). For example, if Ld6=nu, the sixth defrost cycle is disabled.

(0 to 23h 50 min) These parameters set the beginning of the eight programmable defrost cycles during workdays. For example, when Ld2=12.4, the second defrost starts at 12.40 during workdays.

(0 to 23h 50 min) These parameters set the beginning of the eight programmable defrost cycles during holidays. For example, when Sd2=3.4, the second defrost starts at 3.40 on holidays.

To Set Energy Saving Times Section Menu • 7

6 Electronic

Expansion Valve Menu (For Model XM679 Only)

1. Enter the programming mode by pressing the SET and DOWN buttons for a few seconds (measurement unit starts blinking).

2. Press the UP or DOWN key until the controller displays the EEU label.

3. Press SET. You are now in EEV function menu.

7 Controlling Loads

7.1. Solenoid Valve

The regulation is performed based on the temperature measured by the thermostat probe that can be a physical probe or a virtual probe obtained by a weighted average between the two probes (see

Section 8, Parameters List) with a positive

differential from the setpoint. If the temperature increases and reaches setpoint plus the differential, the solenoid valve is opened and then it is closed when the temperature reaches the setpoint value again.

In case of fault in the thermostat probe, the opening and closing time of the solenoid valve are configured by Con and CoF parameters.

7.2. Standards Regulation and Continuous Regulation

The regulation can be performed in two ways:

• Standard regulation is reaching the best superheat via a classic temperature regulation obtained using hysteresis.

• Continuous regulation permits the use of the valve to realize a high performance temperature regulation

with a good factor of superheat precision. This only

can be used only in centralized plants and it is available only with electronic expansion valve by selecting the CrE=Y parameter.

In any case, the regulation is performed via the PI regulator that gives the opening percentage to the valve via PWM modulation explained as follows: Opening Percentage is obtained from the average of the Opening Time with respect to the CyP time period

Figure 7-1).

(see

8 • XM679K I&O Manual 026-1218 Rev 4

Figure 7-1 - Regulation via PI Regulator

Opening percentage is the percentage of the cycle period where the valve is open. For example, if

CyP=6s (standard value) and the valve is opened at 50%, this means that the valve is opened for three (3)

seconds during the cycle period.

7.2.1. First Kind of Regulation: Standard Regulation

In this case, the Hy parameter is the differential for the standard ON/OFF regulation. In this case, the int parameter is neglected. The regulation follows the diagram shown in

Figure 7-2 - First Kind of Regulation

Figure 7-2:

7.2.2. Second Kind of Regulation: Continuous Regulation



(For Model XM679 Only)

In this case, the Hy parameter is the proportional band of PI in charge of room temperature regulation. It is advisable to use at least Hy=10°F/ 5.0°C.

The int parameter is the integral time of the same PI regulator. Increasing the int parameter will cause the PI regulator to react more slowly, and is true vice versa. To disable the integral part of regulation, set int=0.

Figure 7-3 - Second Kind of Regulation

7.3. Defrost

7.3.1. Defrost starting

In any case, the device checks the temperature that is read by the configured defrost probe before starting defrost procedure. After that:

• Starting defrost cycles can be operated locally (manual activation by means of the keyboard or digital input or end of interval time) or the command can come from the Master defrost unit of the LAN. In this case, the controller will operate the defrost cycle following the parameters it has programmed, but at the end of the drip time it will wait until all the other LAN controllers finish their defrost cycle before the normal regulation of the temperature is restarted according to the dEM parameter.

• Every time any of the LAN controllers begin a defrost cycle, it issues the command to the network making all the other controllers start their own cycle. This allows a perfect synchronization of the defrost in the whole multiplexed cabinet according to LMd parameter.

• By selecting the dPA and dPb probes and changing the dtP and ddP parameters, defrost can be started when the difference between the dPA and dPb probes is lower than dtP for all ddP time. This is useful to start defrost when a low thermal exchange is detected. If ddP=0, this function is disabled.

7.3.2. Defrost Ending

•If dPA and dPb are present and d2P=y, the controller stops the defrost procedure when dPA is higher than the dtE temperature and dPb is higher than the dtS temperature.

At the end of defrost, the drip time is controlled through the Fdt parameter.

Defrost Controlling Loads • 9

7.4. Fans

7.5. Anti-Sweat Heaters 

7.4.1. Control With Relay

The fan control mode is selected by means of the FnC parameter:

• C-n = running with the solenoid valve, OFF during defrost

• C-y = running with th1e solenoid valve, ON during defrost

• O-n = continuous mode, OFF during defrost

• O-y = continuous mode, ON during defrost

An additional parameter FSt provides the setting of temperature, detected by the evaporator probe, above which the fans are always OFF. This ensures that air is circulated only if the temperature is lower than set in FSt.

7.4.2. Control With Analog Output (If Present)

The modulating output (trA=rEG) works in a proportional manner (excluding the first AMt seconds where the fans speed is the maximum). The regulation setpoint is relative to the regulation setpoint and is indicated by the parameter ASr, the proportional band is always located above the SET+ASr value and its value is PbA. The fans are at minimum speed (AMi) when the temperature read by the fan probe is SET+ASr and the fans are at maximum speed (AMA) when the temperature is SET+ASr+PbA.

(If Present)

This control is performed when trA=AC. In this case, there are two ways to control the anti-sweat heaters:

• Without real dewpoint information: in this case, the default value for dewpoint is used (SdP parameter).

• Dewpoint received from the XWEB5000 system: the SdP parameter is overwritten when the valid value for dewpoint is received from XWEB.

The P4 probe is used to perform the regulation and it should be placed on the showcase glass. In case of P4 error or if P4 is absent, the output is at AMA value for the AMt time then the output is at 0 value for the time 255-AMt time performing a simple PWM modulation.

Figure 7-5 - Anti-Sweat Heaters

7.6. Auxiliary Output

The auxiliary output is switched ON and OFF by means of the corresponding digital input or by pressing and releasing the DOWN key.

Figure 7-4 - Control with Analog Output

10 • XM679K I&O Manual 026-1218 Rev 4

8 Parameters List

EEU Access to EEV submenu (only XM679)

Differential: (1 to 45°F; 0.1 to 25.5°C) This is the intervention differential for setpoint, this value is always

positive. Solenoid valve Cut IN is Setpoint Plus Differential (Hy). Solenoid valve Cut OUT is when the temperature reaches the setpoint.

REGULATION

Int

CrE

LS Minimum setpoint limit: (-67°F to SET; -55.0°C to SET) Sets the minimum acceptable value for the setpoint.

US Maximum setpoint limit: (SET to 302°F; SET to 150°C) Set the maximum acceptable value for setpoint.

OdS

AC Anti-short cycle delay: (0 to 60 min) The interval between the solenoid valve stop and the following restart.

CCt

CCS

Con

CoF

Integral time for room temperature regulation (Only XM679): (0 to 255 s) This is the integral time for room temperature PI regulator. 0= no integral action.

Continuous regulation activation (Only XM679): (n to Y) n= standard regulation; Y= continuous regulation. Use it only in centralized plants.

Outputs activation delay at start up: (0 to 255 min) This function is enabled at the initial start up of the device and inhibits any output activation for the time set in the parameter. (AUX and Light can work)

Compressor ON time during continuous cycle: (0.0 to 24.0h; resolution 10min) Allows to set the length of the continuous cycle: compressor stays on without interruption for the CCt time. Can be used, for instance, when the room is filled with new products.

Setpoint for continuous cycle: (-67 to 302°F / -55 to 150°C) it sets the setpoint used during the continuous cycle.

Solenoid valve ON time with faulty probe: (0 to 255 min) The time during which the solenoid valve is active in case of faulty thermostat probe. With COn=0 solenoid valve is always OFF.

Solenoid valve OFF time with faulty probe: (0 to 255 min) time during which the solenoid valve is off in case of faulty thermostat probe. With COF=0 solenoid valve is always active.

DISPLAY

PrU

PMU

PMd

rES Resolution (for °C): (in = 1°C; dE = 0.1 °C) allows decimal point display

Lod

Table 8-1 - XM670 to XM679 Parameters List

Auxiliary Output Parameters List • 11

Temperature measurement unit: °C = Celsius; °F = Fahrenheit. CAUTION! When the measurement unit is changed the parameters with temperature values have to be checked.

Pressure mode: (rEL or AbS) defines the mode to use the pressure. CAUTION! the setting of PrU is used for all the pressure parameters. If PrU = rEL all pressure parameters are in relative pressure unit, if PrU = AbS all pressure parameters are in absolute pressure unit. (Only XM679)

Pressure measurement unit: (bAr - PSI - MPA) it selects the pressure measurement units. MPA= the value of pressure measured by kPA*10. (Only XM679)

Way of displaying pressure: (tEM - PrE) it permits showing the value measured by pressure probe with  tEM= temperature or by PrE= pressure (Only XM679)

Device display: (nP; P1; P2, P3, P4, P5, P6, tEr, dEF) it selects which probe is displayed by the device. P1, P2, P3, P4, P5, P6, tEr= virtual probe for thermostat, dEF= virtual probe for defrost.

red

Remote display: (nP; P1; P2, P3, P4, P5, P6, tEr, dEF) it selects which probe is displayed by the X-REP. P1, P2, P3, P4, P5, P6, tEr= virtual probe for thermostat, dEF= virtual probe for defrost.

dLy

rPA

rPb

rPE

Display delay: (0 to 24.0 m; resolution 10s) when the temperature increases, the display is updated of  1 °F/1°C after this time.

Regulation probe A: (nP; P1; P2, P3, P4, P5) first probe used to regulate room temperature. If rPA = nP the regulation is performed with real value of rPb.

Regulation probe B: (nP; P1; P2, P3, P4, P5) second probe used to regulate room temperature. If rPb = nP the regulation is performed with real value of rPA

Regulation virtual probe percentage: (0 to 100%) it defines the percentage of the rPA respect to rPb. The value used to regulate room temperature is obtained by: value_for_room = (rPA*rPE + rPb*(100-rPE))/100

ELECTRONIC EXPANSION VALVE SUBMENU (Only XM679)

FtY

Kind of gas (R22, 134, 404, 407, 410, 507,CO2): Type of gas used by plant. Fundamental parameter for correct functioning of all system.

SSH Superheat setpoint: [1°F to 45°F] [0.1°C to 25.5°C] This is the value used to regulate superheat.

CyP Cycle Period: (1 to 15s) Allows to set cycle time

Pb Proportional band: (1 to 108°F / 0.1 to 60.0) PI proportional band

rS Band Offset: (-21 to 21°F / -12.0 to 12.0°C) PI band offset

inC Integration time: (0 to 255s) PI integration time

PEO

Probe Error opening percentage: (0 to 100%) if a temporary probe error occurs, valve opening percentage is PEo until PEd time is elapsed.

Probe Error delay before stopping regulation: (0 to 239 sec. - On = unlimited) if probe error duration is bigger

PEd

than PEd then valve totally closes. Pf message displays. If PEd = On valve opening is PEo until probe error finishes.

OPE

SFd

OPd

Pdd

MnF

dCL

Start opening Percentage: (0 to 100%) Valve opening percentage when start function is active. This phase duration is SFd time.

Start Function duration: (0.0 to 42.0 min: resolution 10s) Sets start function duration and post-defrost duration. During this phase the alarms are neglected.

Opening Percentage after defrost phase: (0 to 100%) Opening valve percentage when after defrost function is active. This phase duration is Pdd time.

Post Defrost Function duration: (0.0 to 42.0 min: resolution 10s) Sets start function duration and post-defrost duration. During this phase the alarms are neglected.

Maximum opening percentage at normal Functioning: (0 to 100%) during regulation it sets the maximum valve opening percentage.

Delay before stopping valve regulation: (0 to 255s) When the cooling request goes off, the electronic valve regulation can go on for the dCL time in order to prevent uncontrolled superheat variation.

Forced opening percentage: (0 to 100% - nu) it permits to force the valve opening to the specified value. This

Fot

value overwrites the value calculated by PID algorithm. CAUTION! To obtain the correct superheat regulation you have to set Fot = nu.

Type of Pressure Transducer: (PP - LAn) it sets type of pressure transducer to use: PP= 4 to 20mA pressure

tPP

transducer or ratiometric transducer 0 to 5V depending on P5C parameter, LAn= the pressure signal arrives from another XM600. Referred to Pb5

Table 8-1 - XM670 to XM679 Parameters List

12 • XM679K I&O Manual 026-1218 Rev 4

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