Emerson Vilter Vission 20/20 Operation And Service Manual page 53

Section 6 • Compressor Control
required to restart it.
The auto-cycle function will operate only in local "Auto"
mode and Direct I/O "Remote Auto" mode. If the au-
to-cycle feature is enabled while running in any other
remote mode, the function will simply be ignored.
However, the Minimum slide position will continue to
be respected in "Remote "Auto" mode. If the compres-
sor changes from a remote mode back to Local "Auto"
mode, the auto-cycle feature will operate normally.
When the Pumpdown feature is enabled, the Auto-
cycle setpoints are automatically disabled. Pump-
down mode will cause the compressor to cycle off
via the Pumpdown Stop Pressure setpoint, and will
not allow the compressor to start again.
Enable:
• Enables the Auto-cycle control. Uncheck the box to
disable the Auto-cycle setpoints.
Figure 6-3. Compressor Control Screen - Process Pressure Control
Vission 20/20 • Operation and Service Manual • Emerson • 35391SC 2.7
NOTE
Start Pressure:
• When the suction pressure meets or exceeds this set-
point, the compressor will start.
Start Delay:
• Delays the compressor from starting when the suc-
tion pressure meets or exceeds this setpoint.
Stop Pressure:
• When the suction pressure meets or falls below this
setpoint, the compressor will stop.
Stop Delay:
• Delays the compressor from stopping when the suc-
tion pressure meets or exceeds this setpoint.
Minimum Slide Position:
• The minimum capacity slide position that the com-
pressor is allowed to run at.
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