Standard Screw Compressor - RWB Series
3-6
M&M
R
EFRIGERATION
I
NC
.
Stopping the Screw Compressor
The stopping sequence is as follows:
1. The Motor is stopped.
2. Once the starter has disengaged the slide valve is moved to the fully unloaded posi-
tion (below 5%). If the slide valve does not respond within two (2) minutes, the stop
sequence is failed on OEM STOP SLIDE POSITION HIGH.
3. The Liquid Injection is turned off and the oil temperature is regulated using the oil
heaters.
The screw compressor can be stopped manually or automatically depending on the operating
mode. Any failure will automatically stop the compressor.
Manual Mode
A manual stop is accomplished by using the stop button on the CCS panel. The stop but-
ton is active on all screens and causes an immediate shutdown of the motor. Use of the
manual Stop button will also take the compressor off-line.
Automatic Mode
When the Auto Start/Stop feature is enabled and the compressor is in the automatic
mode, the compressor will stop automatically when the control parameter falls below the
cut-out setpoint.
Remote Mode
I/O Control
When remote operation is desired using discrete I/O signals, the Remote Start/Stop
input signal is used to stop the compressor for the Remote and Auto-Remote modes.
When the Remote Start/Stop input is de-energized, the compressor will stop but
remain on-line. A failure or manual stop command will stop the compressor and force
it off-line.
Network Control
When the Network Communications option is enabled, stopping in the Remote and
Auto-Remote modes is performed using messages from a remote computer. Sepa-
rate messages are available to stop the compressor and leave it on-line, or to stop
the compressor and force it off-line. For more information on network operation,
please refer to Appendix C.
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