General Warning
Introduction • 1
1
Introduction
1.1. General Warning
Please read the following safety precautions and warnings
before using this manual:
2
Overview
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
