©2008 Ingersoll Rand Company Page 17
indicated by the sequence display: if the
assignment letter (A, B, C) is on continuously,
the compressor is running loaded. If the
assignment letter is flashing, the compressor is
unloaded. If the assignment letter is replaced by
a dash “– “ the compressor is not available. For
Integral, sequencing to work properly each
compressor must be started locally, running or in
standby state. The Master compressor cannot
start the slave compressors that have been
stopped. An unavailable compressor will always
be assigned last in the sequence. System
pressure is determined by the set points of the
Master controller and values determined by the
Master’s pressure sensor. The system “target”
pressure is calculated to be the midpoint
between the Master’s upper pressure set point
and lower pressure set point. A slave
compressor will ignore its own pressure set
points when operating with a system Master
controller however, all Slave safety functions
continue in accordance with the local pressure
detected by the Slave’s delivery pressure
sensor. In the event that communications with
the Master controller is disrupted, a Slave
compressor will automatically switch to local
regulation control. When the Master becomes
available again, the Slave pressure regulation
will automatically revert to the Master and the
“Remote Pressure Control” symbol will remain.
To Next Page
Loading...
Need help?
General
