Emerson Dixell XR75CX Series User 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 • i

Table of Contents

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

1.1. GENERAL WARNING ..................................................................................................................................................... 1

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

2.1. GENERAL DESCRIPTION................................................................................................................................................ 1

2.2. ORDERING CODE ......................................................................................................................................................... 1

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

3.1. COMPRESSOR ................................................................................................................................................................ 2

3.2. DEFROST ....................................................................................................................................................................... 2

3.3. CONTROL 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. LIGHT 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. KEYS AND FUNCTIONS ................................................................................................................................................. 4

4.2. USE OF LEDS............................................................................................................................................................... 4

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

5.1. HOW TO SEE THE MIN TEMPERATURE ........................................................................................................................ 5

5.2. HOW TO SEE THE MAX TEMPERATURE....................................................................................................................... 5

5.3. HOW TO RESET THE MAX AND MIN TEMPERATURE RECORDED ................................................................................. 5

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

6.1. HOW TO SEE THE SETPOINT ......................................................................................................................................... 6

6.2. HOW TO CHANGE THE SETPOINT.................................................................................................................................. 6

6.3. HOW TO START A MANUAL DEFROST.......................................................................................................................... 6

6.4. HOW TO CHANGE A PARAMETER VALUE..................................................................................................................... 6

6.5. THE 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. HOW TO ASSIGN A MODBUS ADDRESS ..................................................................................................................... 7

6.7. HOW TO LOCK THE KEYBOARD ................................................................................................................................... 7

6.8. TO UNLOCK THE KEYBOARD ....................................................................................................................................... 7

6.9. THE CONTINUOUS CYCLE............................................................................................................................................. 7

6.10. THE ON/OFF FUNCTION ............................................................................................................................................ 7

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

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

8.1. GENERIC ALARM (I2F=EAL) ..................................................................................................................................... 13

8.2. SERIOUS ALARM MODE (I2F=BAL) ........................................................................................................................... 13

ii • XR75CX I&O Manual 026-1210 Rev 4

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

8.4. DOOR SWITCH INPUT (I1F OR I2F=DOR) .................................................................................................................... 13

8.5. START DEFROST (I1F OR I2F=DEF)............................................................................................................................ 13

8.6. SWITCH THE AUXILIARY RELAY (I2F=AUS) ............................................................................................................. 13

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

8.8. ENERGY SAVING (I2F=ES) ......................................................................................................................................... 13

8.9. ON - OFF FUNCTION (I2F=ONF)................................................................................................................................ 13

8.10. DIGITAL INPUTS POLARITY....................................................................................................................................... 14

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. PROBE CONNECTION ................................................................................................................................................. 16

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

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

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

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

14.1. SILENCING BUZZER/ALARM RELAY OUTPUT ........................................................................................................... 18

14.2. ALARM RECOVERY ................................................................................................................................................... 18

14.3. OTHER MESSAGES .................................................................................................................................................... 18

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

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

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

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

18.1. COM PORT ASSOCIATIONS - E2 VERSIONS 3.XX AND BELOW ................................................................................ 23

18.2. COM PORT ASSOCIATIONS - E2 VERSIONS 4.2 AND ABOVE ................................................................................... 23

18.3. E2 SETUP OF DEVICES .............................................................................................................................................. 24

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

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

18.4. WIRING TYPES .......................................................................................................................................................... 25

18.5. MODBUS TERMINATION BLOCKS ........................................................................................................................... 26

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

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

General Warning Introduction • 1

1 Introduction

1.1. General Warning

Please read the following safety precautions and warnings

before using this manual:

2Overview

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

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.

Device

Name Dixell Code Emerson

Code

XR75CX -

110VAC

XR75CX-4C6F3B -

X0LG3OEUB4NA-000 318-6030

XR75CX -

230VAC

XR75CX-5C6F3B -

X0LG3OEUB5NA-000 318-6031

Table 2-1 - Product Ordering Code

2 • XR75CX I&O Manual 026-1210 Rev 4

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.

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.

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 during defrost.

•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 during defrost.

•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

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:

Figure 3-1 - Compressor Temperature Regulation

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

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 and 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.

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.

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.

4 • XR75CX I&O Manual 026-1210 Rev 4

4 Front Panel

Commands

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:

4.2. Use of LEDS

Each LED function is described in Table 4-2:

Figure 4-1 - XR75CX Front Panel

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

Locks/Unlocks the keyboard

To enter programming mode

Returns to room temperature display

LED Mode Function

ON Compressor enabled

Flashing Anti-short cycle delay enabled

ON Defrost enabled

Flashing Drip time in progress

ON Fans enabled

Flashing Fans delay after defrost in

progress.

ON An alarm is occurring

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

Table 4-1 - XR75CX Front Panel Keys and Functions

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