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Section 7 • Compressor Control Setpoints
Single Screw Compressor PLC Operation Manual • Vilter/Emerson • 35391CM
will be energized after the compressor main motor
stops, if installed.
• Oil Drain Solenoid ON Time (at Stop): Amount of
time the oil drain solenoid will be energized after the
compressor main motor stops, if installed.
OIL SEPARATOR HEATERS
• Defi nes separator oil temperature setpoints to con-
trol the oil separator heaters.
PART TIME OIL PUMP
• If selected, defi nes the pressure ratios at which the oil
pump will stop above and re-start below.
LOAD LIMITS
For more information on load limits and forced unload-
ing, see Section 2 Operational Descriptions.
• Low Suction Pressure Inhibit Loading: compressor
will not be allowed to load if Suction Pressure falls be-
low this setpoint.
• Low Suction Pressure Unload At: Compressor will be-
gin continuously unloading if Suction Pressure falls
below this setpoint.
• Low Suction Pressure Unload To: If forced unloading
is active, the compressor will unload continuously un-
til Suction Pressure reaches this setpoint.
• High Discharge Pressure Inhibit Loading: compressor
will not be allowed to load if Discharge Pressure rises
above this setpoint.
• High Discharge Pressure Unload At: Compressor will
begin continuously unloading if Discharge Pressure
rises above this setpoint.
• High Discharge Pressure Unload To: If forced unload-
ing is active, the compressor will unload continuously
until Discharge Pressure reaches this setpoint.
• High Motor Amps Inhibit Loading: compressor will
not be allowed to load if Main Motor Amperage rises
above this setpoint.
• High Motor Amps Unload At: Compressor will begin
continuously unloading if Main Motor Amperage ris-
es above this setpoint.
• High Motor Amps Unload To: If forced unloading is
active, the compressor will unload continuously until
Main Motor Amperage reaches this setpoint.
VOLUME SLIDE ADJUSTMENT
• Volume Slide Adjustment Factor: Offset that will be
applied to the calculated volume slide target.
• Capacity Slide Range Adj. Factor is Applied: The
Volume Slide Adjustment Factor will be applied when
capacity slide valve position is within the defi ned
range.
MAIN MOTOR FLA
• This is a convenience calculation to aid in setting mo-
tor amps load limit setpoints.
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