Introduction; General Warning; Overview; General Description - Emerson XR75CX Installation And Operation Manual

1

Introduction

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 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.
General Warning
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Overview

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

Device
Dixell Code
Name
XR75CX-4C6F3B
XR75CX -
110VAC
X0LG3OEUB4NA-000
XR75CX-5C6F3B -
XR75CX -
230VAC
X0LG3OEUB5NA-000
Table 2-1 - Product Ordering Code
Emerson
Code
318-6030
318-6031
Introduction • 1