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Operating Procedures
•
OFF by Alarm - Compressor is off by Alarm.
•
Running - Compressor is running.
•
ON by Min On - Compressor has been called off
although it keeps running due to safety Minimum On
Time.
•
ON by Pumpdown - Compressor has been called off
but keeps running due to pumpdown sequence.
•
Start Delayed - Waiting for EXV positioning (if
applicable) or going through second compressor start-
up delay.
•
OFF by Restriction – Module capacity restricted to a
single running compressor only due to Low Chilled
Leaving Water Temperature.
•
Min Speed Sequence - Variable speed compressor is
going through Variable Speed Drive Minimum Speed
sequence (SuperMod only).
•
OFF by Min DP - Compressor is off due to inability to
build up satisfactory Suction/Discharge differential
pressure.
•
OFF by Low Ambient - Compressor can not start due to
Low Ambient temperature restriction.
•
Refrigeration Evacuation Cycle - Circuit is running
Refrigeration Evacuation Cycle.
Comp (X) Speed
Can be displayed in different units.
40
•
Volts – If PLC analog output is used to control variable
speed compressor.
•
RPM – Compressor speed is communicated to external
variable speed drive, for instance VFD.
Module I/O Screens
Data is collected by sensors as either analog or digital
signals and displayed on the IO Status screens.
When the module screen is displayed, pressing the I/O
button displays the I/O menu.
The I/O menu is comprised of three screens. Both primary
and secondary modules have analog I/O (analog input and
analog output), and digital I/O (digital input and digital
output). The third screen, expansion I/O, only applies to the
primary module.
ARTC-SVX008A-EN
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