Emerson Dixell XR75CX Series User manual

026-1210 Rev 0 09-FEB-2011

XR75CX Digital Controller for Medium-Low

Temperature Refrigeration Applications

Installation and Operation Manual

Retail Solutions

3240 Town Point Drive NW Suite 100

Kennesaw, GA 30144 USA

Phone: 770-425-2724

Fax: 770-425-9319

The information contained in this manual has been carefully checked and is believed to be accurate. However, Com-

puter Process Controls, Inc. assumes no responsibility for any inaccuracies that may be contained herein. In no event will

Computer Process Controls, Inc. be liable for any direct, indirect, special, incidental, or consequential damages resulting

from any defect or omission in this manual, even if advised of the possibility of such damages. In the interest of continued

product development, Computer Process Controls, Inc. reserves the right to make improvements to this manual, and the

products described herein, at any time without notice or obligation.

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 OA3; TERM. 1-4) ........................................................................................... 3

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

3.4.2. Auxiliary Relay – oA3=AUS ................................................................................................................................. 3

3.4.3. On/Off Relay – oA3=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. TOSET THE CURRENT TIME AND DAY (ONLY FOR DEVICES WITH RTC)................................................................. 6

6.2. HOW TO SEE THE SETPOINT ......................................................................................................................................... 6

6.3. HOW TO CHANGE THE SETPOINT.................................................................................................................................. 6

6.4. HOW TO START AMANUAL DEFROST.......................................................................................................................... 6

6.5. HOW TO CHANGE APARAMETER VALUE..................................................................................................................... 6

6.6. THE HIDDEN MENU ...................................................................................................................................................... 6

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

6.6.2. How to Move a Parameter from the Hidden Menu and Vice Versa ..................................................................... 7

6.7. HOW TO ASSIGN AMODBUS ADDRESS ..................................................................................................................... 7

6.8. HOW TO LOCK THE KEYBOARD ................................................................................................................................... 7

6.9. TOUNLOCK THE KEYBOARD ....................................................................................................................................... 7

6.10. THE CONTINUOUS CYCLE........................................................................................................................................... 7

6.11. THE ON/OFF FUNCTION ............................................................................................................................................ 7

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

8 DIGITAL INPUTS....................................................................................................................................................... 14

8.1. GENERIC ALARM (I2F=EAL) ..................................................................................................................................... 14

ii • XR75CX I&O Manual 026-1210 Rev 0 09-FEB-2011

8.2. SERIOUS ALARM MODE.............................................................................................................................................. 14

8.3. PRESSURE SWITCH ...................................................................................................................................................... 14

8.4. DOOR SWITCH INPUT.................................................................................................................................................. 14

8.5. START DEFROST.......................................................................................................................................................... 14

8.6. SWITCH THE AUXILIARY RELAY ................................................................................................................................ 14

8.7. INVERSION OF THE KIND OF ACTION: HEATING - COOLING....................................................................................... 14

8.8. ENERGY SAVING ......................................................................................................................................................... 14

8.9. HOLIDAY DEFROST ..................................................................................................................................................... 14

8.10. ON - OFF FUNCTION ................................................................................................................................................ 14

8.11. DIGITAL INPUTS POLARITY....................................................................................................................................... 15

9 RS485 SERIAL LINE (FOR MONITORING SYSTEMS)...................................................................................... 16

10 X-REP OUTPUT (OPTIONAL) ............................................................................................................................... 16

11 INSTALLATION AND MOUNTING...................................................................................................................... 17

12 ELECTRICAL CONNECTIONS............................................................................................................................. 17

12.1. PROBE CONNECTION................................................................................................................................................. 17

13 HOW TO USE THE HOT KEY ............................................................................................................................... 18

13.1. HOW TO PROGRAM AHOT KEY FROM THE DEVICE (UPLOAD) ............................................................................... 18

13.2. HOW TO PROGRAM AHOT KEY FROM THE DEVICE (UPLOAD) ............................................................................... 18

14 ALARM SIGNALS .................................................................................................................................................... 19

14.1. SILENCING BUZZER/ALARM RELAY OUTPUT ........................................................................................................... 19

14.2. ALARM RECOVERY ................................................................................................................................................... 19

14.3. OTHER MESSAGES .................................................................................................................................................... 19

15 SPECIFICATIONS.................................................................................................................................................... 20

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

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

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

18.1. E2 SETUP OF DEVICES .............................................................................................................................................. 23

18.1.1. Set Up Network Ports........................................................................................................................................ 23

18.1.2. Add and Connect the Device ............................................................................................................................. 24

18.2. WIRING TYPES .......................................................................................................................................................... 25

18.3. MODBUS TERMINATION BLOCKS ........................................................................................................................... 26

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

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 micropro-

cessor based controller, suitable for applications on

medium or low temperature ventilated refrigeration

units. It has four (4) relay outputs to control compres-

sor, fan, and defrost, which can be either electrical or

reverse cycle (hot gas) and light (configurable). It can

have a Real Time Clock (RTC) that allows program-

ming of up to six (6) daily defrost cycles, divided into

holidays and workdays. A “Day and Night” function

with two different setpoints is fitted for energy sav-

ing.

It can also have up to four (4) NTC or PT1000

probe inputs: the first one for temperature control, the

second one located on the evaporator to control the

defrost termination temperature and to manage the

fan. One of the two (2) digital inputs can operate as a

third temperature probe. The fourth probe is used to

signal the condenser temperature alarm or to display

a temperature value.

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 X-WEB

family. The Hot Key receptacle allows the controller

to be programmed by means of the Hot Key program-

ming keyboard.

The controller is fully configurable through spe-

cial 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 differ-

ent 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 con-

troller only within the operating limits and avoid sud-

den 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 Retail Solutions (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 environ-

ments, the use of main filters (our mod. FT1) in paral-

lel 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 0 09-FEB-2011

3 Controlling Loads

3.1. Compressor

The regulation is performed according to the tem-

perature measured by the thermostat probe with a pos-

itive differential 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).

The defrost interval depends on the presence of the

RTC (optional). If the RTC is present, it is controlled

by means of parameter EdF:

•withEdF=in the defrost is made every IdF time (the

standard method for the controller without RTC)

•withEdF=rtC, the defrost is made in real time de-

pending on the hours set in the parameters.

Ld1..Ld6 on workdays and in Sd1…Sd6 in holi-

days

Other parameters are used to control defrost cy-

cles: 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 de-

frost 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 of air circulation only if this tem-

perature 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. Function-

ing: if the difference of temperature between the

evaporator and the room probes is more than the value

of the FCt parameter, the fans are switched ON.

When FCt =0, the function is disabled.

3.3.2. Cyclical Activation of the Fans

With Compressor Off

When Fnc =C-n or C-y (fans in parallel to the

compessor), 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 continue working for the Fon time.

When Fon = 0, the fans always remain OFF when the

compressor is OFF.

Figure 3-1 - Compressor Temperature Regulation

Light Relay Configuration (PAR oA3; TERM. 1-4) Controlling Loads • 3

3.4. Light Relay

Configuration (PAR

oA3; TERM. 1-4)

The functioning of the auxiliary relay (terminals

1-4) can be set by the oA3 parameter, according to the

kind of application needed. Possible settings are as

follows:

3.4.1. Light Relay

When oA3 = Lig the relay 1-4 operates as a light.

3.4.2. Auxiliary Relay — oA3=AUS

a. Relay Activation By Digital Input 2 (oA3 =

AUS, i2F = AUS)

When oA3 = AUS and i2F = AUS the relay 1-4 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 functioning of the auxiliary relay can be set

with these five parameters. The differential is given

by the SHy parameter.

3.4.3. On/Off Relay — oA3=onF

In this case the relay is activated when the control-

ler is turned ON and de-activated when the controller

is turned OFF.

3.4.4. Neutral Zone Regulation

When oA3 = db the relay 1-4 can control a heater

element to perform a neutral zone action.

oA3 cut in = SEt-Hy

oA3 cut out = SEt

3.4.5. Alarm Relay

When oA3 = ALr relay 1-4 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 re-

covers.

3.4.6. Night Blind Management Dur-

ing Energy Saving Cycles

With oA3 = HES, the relay 1-4 operates to man-

age the night blind: the relay is powered when the en-

ergy saving cycle is activated, by digital input, front

panel, or RTC (optional).

NOTE: Set oA3 =AUS and ArP= nP (no probe

for auxiliary output). In this case the relay 1-4

can be activated only by the digital input with

i1F or i2F = AUS.

4 • XR75CX I&O Manual 026-1210 Rev 0 09-FEB-2011

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 corre-

sponding 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 pa-

rameter in programming mode, or to confirm

an operation

Starts a manual defrost

Press the UP arrow to see the MAX tempera-

ture, to browse the parameter codes in pro-

gramming mode, or to increase the currently

displayed temperature value.

Press the DOWN arrow to see the MIN tem-

perature, to browse the parameter codes in

programming mode, or to decrease the cur-

rently displayed temperature value.

Table 4-1 - XR75CX Front Panel Keys and Functions

Switches the device ON and OFF, if

onF = oFF

Switches the light ON and OFF, if oA1 = Lig

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

ON30 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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