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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
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, Technical Data).
• 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 in parallel with
inductive loads could be useful.
General Warning
2
2.1. How to Check the
Figure 2-1 - XM679K Software Release
2.2. General Description
Models XM670-XM679 are high level
microprocessor based controllers for multiplexed
cabinets, suitable for applications on medium or low
temperature. It can be inserted in a Local Area
Connection (LAN) of up to eight (8) different sections
that can operate depending on the programming, as
stand alone controllers or by following the commands
coming from the other sections.
XM670/XM679 controllers can have six (6) relay
outputs to control the solenoid valve, defrost that can
be either electrical or hot gas, evaporator fans, lights,
auxiliary output, alarm output and an output to drive
pulsed electronic expansion valves (applicable for
XM679 only).
The controllers can also have up to four (4) probe
inputs: the first one for temperature control, the
second for defrost end temperature control of the
evaporator, the third for the display, and the fourth
probe input can be used for applications with virtual
probe or for inlet/outlet air temperature measurement.
Model XM679 can exclusively have two (2) other
probes that can be used for superheat measurement
and regulation. Both XM670 and XM679 controllers
Overview
Software Release of the
XM679K
1. Check the software release of the
XM679K printed on the label of the
controller.
Introduction • 1
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