OM WGS-5 WGS 130A to 190A 55
Circuit Switch = OFF
Technician password active
Circuit Mode setpoint = TEST
A test menu can then be selected to allow activation of the outputs. It is possible to switch
each digital output ON or OFF and set the analog outputs to any value. Upon entering test
mode, all outputs will always default to the off state. Upon leaving test mode, all outputs
will automatically reset to the off state.
Compressors cannot be started in TEST mode.
Compressor Control
Multiple Compressor Staging
This section defines which compressor is the next one to start or stop. Compressors with
fewer starts will normally start first, and compressors with more run hours will normally
stop first.
Functions
Can start/stop com
pressors according to an operator defined sequence.
Can start compressors based on number of starts (run hours if starts are equal) and stop
on run hours.
The above two modes can be combined, so that there are two or more groups, where all
compressors in the first group are started (based on number of starts/hours) before any
in the second group, etc. Conversely, all compressors in a group are stopped (based on
run hours) before any in the preceding group, etc.
Multiple Compressor Start/Stop Timing – Cool Mode
This section defines when a com
pressor is to start or stop when the chiller is operating in
cool mode.
Required Parameters
Startup Delta T setpoint.
Stage Up Delta T setpoint
Stage Down Delta T setpoint
Stop Delta T setpoint
LWT error (See definition under Compressor Capacity Control section.)
Full load indicator for each compressor
Full Load Indicator
A
circuit is considered to be at full load in the compressor staging logic when any of the
following occur:
Slide control = manual
A low or high pressure limit event has been active for 10 seconds
Slide target >= 75% AND max slide target > 75%
Slide target >= max slide target AND max slide target <= 75%
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