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Sequencer Status
Every compressor in a sequencer’s lead list is assigned a sequencer status which can be viewed on
the sequencer status page. The following list describes the possible status conditions. :
UNAVAIL
-The compressor is not available to the sequencer.
STANDBY
-The compressor is available to the sequencer. This compressor may be stopped
and on-line or be running with time remaining on its anti-cycle timer.
LOADED
-The compressor is running and has been told to stay fully loaded
TRIM
-The compressor is running and is the trim machine.
HOTSTBY
-The Hot Standby state occurs when the compressor is running at zero percent
capacity due to time remaining on its anti-recycle timer. This compressor is available to be
restarted immediately if required by the sequencer.
FRCTRIM
-The Force Trim state is an optional state used in two-stage refrigeration
systems. If the booster sequencer needs a compressor to start but none of the high stage
machines are currently running, the lead compressor in the high stage lead list will be forced
to start and run.
NO HSTG
-The No High Stage state is an optional state used in two-stage refrigeration
systems. If the booster sequencer needs a compressor to start but all of the high stage
machines are failed or off-line, the booster compressors will not be allowed to start.
Compressor Availability
The sequencer is continuously checking the status of all compressors in its lead list to determine their
availability. Unavailable compressors are marked with a sequencer status of UNAVAIL and are skipped
when sequencer actions are taken. A compressor must meet the following conditions to be available to a
sequencer:
COMMUNICATION WITH THE MASTER
-The communications between the master and the
panel controlling the compressor must be operational. Compressors being controlled locally by
the master are not affected by communications.
SEQUENCED MODE
-The compressor must be in sequenced mode.
ON-LINE
-The compressor must have been placed on-line for sequenced operation.
NO TIME REMAINING ON THE ANTI-CYCLE TIMER
-If the compressor is stopped with time
remaining on the anti-cycle timer it will not be allowed to start. Therefore it is unavailable for
sequenced operation.
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