Auto Cycle - Emerson VILTER MicroVission Operation And Service Manual

Section 5 • Compressor Control

Auto Cycle

The auto-cycle setpoints define the control points in
which the compressor will automatically cycle on and off
when placed into "Auto" run mode. These setpoints can
be "enabled" or "disabled" using the check box. The au-
to-cycle function will operate only in local "Auto" mode
and "Direct I/O (Auto)" mode. If the auto cycle feature
is enabled while running in any other remote mode, the
function will simply be ignored.
If the compressor changes from a Remote mode back to
Local "Auto" mode, the auto-cycle feature will operate
normally.
Auto Cycle Suction Pressure
• Enable: Enables the Auto cycle control. Uncheck the
box to disable the Auto cycle setpoints.
• Start Pressure: When the suction pressure is equal
to or greater than this setpoint, the compressor will
start.
Figure 5-4. Compressor Control Screen - Auto Cycle (Suction Pressure)
MicroVission Controller • Operation and Service Manual • Emerson • 35391MV 1.3
• Start Delay: Before the compressor start, there is a
delay for the set time to ensure that suction pressure
remains equal to or greater than the "Start Pressure".
• Stop Pressure: When the suction pressure is less than
or equal to this setpoint, the compressor will stop.
• Stop Delay: Before the compressor stop, there is a
delay for the set time to ensure that the suction pres-
sure remains less than or equal to the "Stop Pressure".
• Min. Load Shutdown Timer: Enables the Min. Load
Shutdown Timer functionality. Uncheck the box to
disable the Min. Load Shutdown Timer setpoint and
functionality.
This timer is visible and functional only when the
cylinders and unloaders are configured with 100%
unload configuration. If the Compressor is 100% un-
loaded continuously for this amount of time then the
compressor will stop on Auto-Cycle.
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