Emerson Dixell XR75CX Series, Dixell XR75CX-110VAC, Dixell XR75CX-230VAC Installation And Operation Manual

XR75CX Digital Controller for Medium-Low Temperature Refrigeration Applications Installation and Operation Manual

026-1210 Rev 4

Emerson

1065 Big Shanty Road NW, Suite 100

Kennesaw, GA 30144 USA

770-425-2724 •

www.emerson.com

Table of Contents

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

1.1. G

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

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

2.1. G

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

2.2. O

RDERING CODE ......................................................................................................................................................... 1

3 CONTROLLING LOADS ............................................................................................................................................ 2

3.1. C

OMPRESSOR ................................................................................................................................................................ 2

3.2. D

EFROST ....................................................................................................................................................................... 2

3.3. C

ONTROL OF EVAPORATOR FANS ................................................................................................................................ 2

3.3.1. Forced Activation of Fans..................................................................................................................................... 2

3.3.2. Cyclical Activation of the Fans With Compressor Off.......................................................................................... 2

3.4. L

IGHT RELAY CONFIGURATION (PAR OA2; TERMINALS 1-2)..................................................................................... 3

3.4.1. Light Relay............................................................................................................................................................ 3

3.4.2. Auxiliary Relay – oA2=AUS .................................. ............................................................................................... 3

3.4.3. On/Off Relay (oA2=onF)...................................................................................................................................... 3

3.4.4. Neutral Zone Regulation ...................................................................................................................................... 3

3.4.5. Alarm Relay........................................................................................................................................................... 3

3.4.6. Night Blind Management During Energy Saving Cycles................................................ ...................................... 3

4 FRONT PANEL COMMANDS.................................................................................................................................... 4

4.1. K

EYS AND FUNCTIONS ................................................................................................................................................. 4

4.2. U

SE OF LEDS ............................................................................................................................................................... 4

5 MAX AND MIN TEMPERATURE MEMORIZATION........................................................................................... 5

5.1. H

OW TO SEE THE MIN TEMPERATURE ........................................................................................................................ 5

5.2. H

OW TO SEE THE MAX TEMPERATURE....................................................................................................................... 5

5.3. H

OW TO RESET THE MAX AND MIN TEMPERATURE RECORDED ................................................................................. 5

6 MAIN FUNCTIONS ...................................................................................................................................................... 6

6.1. H

OW TO SEE THE SETPOINT ......................................................................................................................................... 6

6.2. H

OW TO CHANGE THE SETPOINT.................................................................................................................................. 6

6.3. H

OW TO START A MANUAL DEFROST.......................................................................................................................... 6

6.4. H

OW TO CHANGE A PARAMETER VALUE..................................................................................................................... 6

6.5. T

HE HIDDEN MENU ...................................................................................................................................................... 6

6.5.1. How to Enter the Hidden Menu ............................................................................................................................ 6

6.5.2. How to Move a Parameter From the Hidden Menu To the First Level and Vice Versa...................................... 7

6.6. H

OW TO ASSIGN A MODBUS ADDRESS ..................................................................................................................... 7

6.7. H

OW TO LOCK THE KEYBOARD ................................................................................................................................... 7

6.8. T

O UNLOCK THE KEYBOARD ....................................................................................................................................... 7

6.9. T

HE CONTINUOUS CYCLE............................................................................................................................................. 7

6.10. T

HE ON/OFF FUNCTION ............................................................................................................................................ 7

7 PARAMETERS ............................................................................................................................................................. 8

8 DIGITAL INPUTS....................................................................................................................................................... 13

8.1. G

ENERIC ALARM (I2F=EAL) ..................................................................................................................................... 13

8.2. S

ERIOUS ALARM MODE (I2F=BAL)........................................................................................................................... 13

Table of Contents • i

8.3. PRESSURE SWITCH (I2F=PAL) ................................................................................................................................... 13

8.4. D

OOR SWITCH INPUT (I1F OR I2F=DOR) .................................................................................................................... 13

8.5. S

TART DEFROST (I1F OR I2F=DEF)............................................................................................................................ 13

8.6. S

WITCH THE AUXILIARY RELAY (I2F=AUS) ............................................................................................................. 13

8.7. I

NVERSION OF THE KIND OF ACTION: HEATING - COOLING (I2F=HTR) .................................................................... 13

8.8. E

NERGY SAVING (I2F=ES) ......................................................................................................................................... 13

8.9. ON - OFF F

8.10. D

IGITAL INPUTS POLARITY....................................................................................................................................... 14

UNCTION (I2F=ONF)................................................................................................................................ 13

9 RS485 SERIAL LINE (FOR MONITORING SYSTEMS)...................................................................................... 15

10 X-REP OUTPUT (OPTIONAL)............................................................................................................................... 15

11 INSTALLATION AND MOUNTING ..................................................................................................................... 16

12 ELECTRICAL CONNECTIONS............................................................................................................................. 16

12.1. P

ROBE CONNECTION ................................................................................................................................................. 16

13 HOW TO USE THE HOT KEY ............................................................................................................................... 17

13.1. H

13.2. H

OW TO PROGRAM A HOT KEY FROM THE DEVICE (UPLOAD) ............................................................................... 17

OW TO PROGRAM THE DEVICE USING A HOT KEY (DOWNLOAD)......................................................................... 17

14 ALARM SIGNALS ................................................................................................................................................... 18

14.1. S

14.2. A

14.3. O

ILENCING BUZZER/ALARM RELAY OUTPUT........................................................................................................... 18

LARM RECOVERY ................................................................................................................................................... 18

THER MESSAGES .................................................................................................................................................... 18

15 SPECIFICATIONS.................................................................................................................................................... 19

16 CONNECTIONS ........................................................................................................................................................ 21

17 E2 MODBUS NETWORK WIRING ....................................................................................................................... 22

18 ECT MODBUS NETWORKING TO E2S............................................................................................................... 23

18.1. COM P

18.2. COM P

18.3. E2 S

ORT ASSOCIATIONS - E2 VERSIONS 3.XX AND BELOW ................................................................................ 23

ORT ASSOCIATIONS - E2 VERSIONS 4.2 AND ABOVE ................................................................................... 23

ETUP OF DEVICES .............................................................................................................................................. 24

18.3.1. Set Up Network Ports........................................................................................................................................ 24

18.3.2. Add and Connect the Device............................................................................................................................. 24

18.4. W

18.5. MODBUS T

IRING TYPES .......................................................................................................................................................... 25

ERMINATION BLOCKS ........................................................................................................................... 26

19 DEFAULT SETTING VALUES .............................................................................................................................. 27

APPENDIX A - ALTERNATE MODBUS COM WIRING METHOD FOR E2, XR, XM, AND XEV DEVICES 31

ii • XR75CX I&O Manual 026-1210 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, Specifications).

• 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 (our mod. FT1) in parallel with inductive loads could be useful.



 



2.1. General Description

Model XR75CX (32 mm x 74 mm) is a microprocessor based controller, suitable for applications on medium or low temperature ventilated refrigeration units. It has four (4) relay outputs to control compressor, fan, and defrost, which can be either electrical or reverse cycle (hot gas) and light (configurable).

It can also have up to four (4) NTC (EU or US type) probe inputs. The first probe is used for temperature control. The second probe is used to control the defrost termination temperature at the evaporator. One of the two (2) digital  inputs can operate as a third temperature probe. The fourth probe is used to control the condenser temperature (for condenser alarm  management) or to display a temperature value. Set the PbC parameter to CtC to support standard CPC temperature sensors (factory default).

The RS-485 serial output enables the unit to be connected to a network line that is MODBUS-RTU compatible, such as the monitoring units of XWEB family. The Hot Key receptacle allows the controller to be programmed by means of the Hot Key programming keyboard.

The controller is fully configurable through special  parameters that can be easily programmed through the  keyboard.



2.2. Ordering Code

Device

Name

XR75CX -

110VAC

XR75CX -

230VAC

Table 2-1 - Product Ordering Code

Dixell Code

XR75CX-4C6F3B -

X0LG3OEUB4NA-000

XR75CX-5C6F3B -

X0LG3OEUB5NA-000

Emerson

Code

318-6030

318-6031

General Warning Introduction • 1

3 Controlling Loads

3.1. Compressor

The regulation is performed according to the temperature measured by the thermostat probe with a positive  differential (HY) from the setpoint: if the temperature  increases and reaches setpoint plus the differential, the compressor is started and then turned OFF when the  temperature reaches the setpoint value again.

3.3. Control of Evaporator Fans

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

• FnC = C_n: fans will switch ON and OFF with the compressor and not run

• FnC = O_n: fans will run even if the compressor is OFF, and not run during defrost.

After defrost, there is a timed fan delay allowing for

drip time, set by means of the Fnd parameter.

• FnC = C_y: fans will switch ON and OFF with the compressor and run

• FnC = O_y: fans will run continuously during  defrost also.

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

3.3.1. Forced Activation of Fans

during defrost.

Figure 3-1 - Compressor Temperature Regulation

In case of a fault in the thermostat probe, the start and stop of the compressor are timed through parameters Con and CoF.

3.2. Defrost

Two defrost modes are available through the tdF  parameter: defrost through electrical heater (tdF=EL) and hot gas defrost (tdF=in).

• EdF=in, the defrost is made every idF time (the standard method for the controller)

Other parameters are used to control defrost cycles: its maximum duration (MdF) and two defrost modes: timed or controlled by the evaporator’s probe (P2P).

At the end of defrost dripping time is started, its  duration is set in the Fdt parameter. With Fdt=0, the  dripping time is disabled.

Managed by the Fct parameter, this function is  designed to avoid short cycles of fans that could occur when the controller is switched ON or after a defrost, when the room air warms the evaporator.

How it works: If the temperature difference between the evaporator probe and the room probe is higher than the Fct parameter value, the fans will be switched ON. When Fct = 0, the function will be disabled.



3.3.2. Cyclical Activation of the Fans With Compressor Off

When FnC = C-n or C-y (fans are working in parallel with the compressor), by means of the Fon and FoF parameters, the fans can carry out ON and OFF cycles even if the compressor is switched OFF. When the compressor is stopped, the fans will continue to work for the Fon time. With Fon = 0, the fans always remain OFF when the compressor is OFF.



3.4. Light Relay Configuration (PAR oA2; Terminals 1-2)

The functioning of the auxiliary relay (terminals  1-2) can be set by the oA2 parameter, according to the kind of application needed. Possible settings are as follows:

2 • XR75CX I&O Manual 026-1210 Rev 4

3.4.1. Light Relay

When oA2 = Lig, the relay 1-2 operates as a light.

3.4.2. Auxiliary Relay — oA2=AUS

a. Relay Activation By Digital Input 2 (oA2 = AUS,

i2F = AUS)

When oA2 = AUS a nd i2F = AUS, the relay 1-2 is switched ON and OFF by the digital input.

b. Auxiliary Thermostat

An anti-condensing heater with the possibility of switching it ON and OFF with the keyboard.

Parameters Involved

• ACH - The kind of regulation for the auxiliary relay: Ht: heating; CL: cooling

• SAA - Setpoint for auxiliary relay

• SHY - Differential for auxiliary relay

• ArP - Probe for auxiliary relay

• Sdd - Auxiliary output OFF during defrost

The differential is set by the SHY parameter.

NOTE: Set oA2 =AUS and ArP= nP (no probe for auxiliary output). In this case, the relay 1-2 can be activated only by the digital input with i1F or i2F = AUS.

3.4.3. On/Off Relay (oA2=onF)

When oA2 = onF, the relay is activated when the controller is turned ON and de-activated when the controller is turned OFF.

3.4.4. Neutral Zone Regulation

When oA2 = db, the relay 1-2 can control a heater  element to perform a neutral zone action.

• oA2 cut in = SET-HY

• oA2 cut out = SET

3.4.5. Alarm Relay

When oA2 = ALr, the relay 1-2 operates as an alarm relay. It is activated every time an alarm occurs. Its status depends on the tbA parameter: if tbA = y, the relay is silenced by pressing any key. If tbA = n, the alarm relay remains ON until the alarm condition recovers.

3.4.6. Night Blind Management During Energy Saving Cycles

With oA2 = HES, the relay 1-2 operates to manage the night blind: the relay is powered when the energy saving cycle is activated by a digital input, front panel button.

Light Relay Configuration (PAR oA2; Terminals 1-2) Controlling Loads • 3

4 Front Panel

Locks/Unlocks the keyboard

Commands

Figure 4-1 - XR75CX Front Panel

4.1. Keys and Functions

Table 4-1 shows the keys that are found on the front panel

of the XR75CX controller and their corresponding  functions:

To enter programming mode

Returns to room temperature display

Table 4-1 - XR75CX Front Panel Keys and Functions

4.2. Use of LEDS

Each LED function is described in Table 4-2:

LED Mode Function

ON Compressor enabled

Flashing Anti-short cycle delay enabled

ON Defrost enabled

Flashing Drip time in progress

ON Fans enabled

Flashing

ON An alarm is occurring

Fans delay after defrost in progress.

Key Function

Press to display target setpoint, to select a parameter in programming mode, or to confirm an operation

Starts a manual defrost

Press the UP arrow key to see the MAX stored temperature, to browse the parameter codes in programming mode, or to increase the displayed temperature value.

Press the DOWN arrow key to see the MIN temperature, to browse the parameter codes in programming mode, or to decrease the displayed temperature value.

Switches the device ON and OFF, if  onF = oFF

Switches the light ON and OFF, if oA1 =

Lig

Table 4-1 - XR75CX Front Panel Keys and Functions

ON Continuous cycle is running

ON Energy saving enabled

ON Light ON

ON Auxiliary relay ON

ON Measurement unit

Flashing Programming phase

Table 4-2 - LEDs

4 • XR75CX I&O Manual 026-1210 Rev 4

5 Max and Min

Temperature Memorization

5.1. How to See the MIN Temperature

1. Press and release the DOWN button.

2. The Lo message will be displayed followed by the minimum temperature recorded.

3. By pressing the DOWN button again or by waiting five seconds, the normal display will be restored.

5.2. How to See the MAX Temperature

1. Press and release the UP button.

2. The Hi message will be displayed followed by the maximum temperature recorded.

3. By pressing the UP button again or by  waiting 5 seconds, the normal display will be restored.

5.3. How to Reset the Max and Min Temperature Recorded

1. Press and hold the SET button for more than 3 seconds while the max or min temperature is displayed (rSt message will be displayed).

2. After confirming the operation, the rSt  message will start blinking and then the  normal temperature will be displayed.

How to See the MIN Temperature Max and Min Temperature Memorization • 5

6 Main Functions

6.1. How to See the Setpoint

1.Press and immediately release the SET key: the display will show the setpoint value.

2. Press and immediately release the SET key or wait for 5 seconds to display the probe value again.

6.2. How to Change the

3. Use the UP or DOWN buttons to change its value.

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

To exit: Press the SET + UP buttons or wait 15 seconds without pressing a key.

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

6.5. The Hidden Menu

The hidden menu includes all the parameters of the  controller.

6.5.1. How to Enter the Hidden Menu

Setpoint

1. Press and hold the SET button for more than 2 seconds to change the setpoint value.

2. The value of the setpoint will be displayed and the °C or °F LED will start blinking.

3. To change the setpoint value, press the UP or DOWN buttons within 10 seconds.

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

6.3. How to Start a Manual Defrost

Press and hold the DEF ke y f or mo re than 2 seconds and a manual defrost will start.

6.4. How to Change a Parameter Value

To change a parameter value, follow these steps:

1. Enter the Programming mode by pressing the SET + DOWN buttons for 3 seconds (the °C or °F LED will start blinking).

1. Enter the Programming mode by pressing the SET + DOWN buttons for three (3) seconds (the °C or °F LED will start blinking).

2. Release the buttons and then push the SET + DOWN buttons for more than seven (7)  seconds. The Pr2 label will be displayed  immediately followed by the HY parameter:

You can now browse the Hidden Menu

3. Select the required parameter.

4. Press the SET button to display its value.

5. Use the UP or DOWN buttons to change its value.

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

To exit: Press SET + DOWN or wait 15 seconds without pressing a key.

NOTE: If no parameter is present in Pr1 menu, after three (3) seconds the noP message is displayed. Keep the keys pressed until the Pr2 message is displayed.