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MicroVission Controller • Operation and Service Manual • Emerson • 35391MV 1.3
Appendix D • Compressor Sequencing Setup
NOTE
Compressor sequencing log will be synced with all
compressors Congured in the sequencing table
provided compressors are available in network. User
can see compressor sequencing log from any of
the compressors. If comp is waiting in Anti Recycle
or Run Permissive condition then that comp will be
skipped and control will be passed to next comp.
Troubleshooting
1. If compressor’s status shows this
symbol, then
the operator should check if the compressor is in seq
standby mode/ control mode error is present/ prior-
ity is set to zero.
2. Check status symbols of all compressors on sequenc-
ing table.
3. Check errors / info log on compressor sequencing
event log screen.
MicroVission Compressor Sequencing Setup
and Conguration Overview:
This document should be used as a supplement to the
MicroVission micro-controller Operation and Service
manual. This document is intended to help with the
steps involved in setting up a compressor sequenc-
ing network. Compressor sequencing is accomplished
using a distributed communication arrangement.
Compressor sequencing in the MicroVission panel is car-
ried out through the MicroVission Ethernet communica-
tion port, using the TCP protocol.
Compressor sequencing is accomplished by the
MicroVission compressor panel monitoring its own con-
trol parameter (either suction pressure or process tem-
perature). As the control parameter changes value and
deviates from the control setpoint, the highest priority
compressor panel makes decisions to start, load and
unload compressors as needed, in order to maintain the
control setpoint. The control setpoint is dened in the
Compressors “Compressor Sequencing” menu.
NOTE
The order of which compressors are started,
stopped, loaded and unloaded is determined
by “compressor priority” which is dened in the
MicroVission panel – the Compressor Sequencing
Menu.
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