FRICK QUANTUM CONTROL PANEL
OPERATION
S90-010 O
Page 31
“Filter Pressure Setpoints” screen. The filter value equals
the Filter Pressure reading minus the Oil Pressure reading,
with only one exception; if the pump is a Prelube and
charge Pressure reading minus the Suction Pressure read-
ing. The pump is turned on if [discharge - (1.4
k
* suction)] < 35.
The pump is turned off if [discharge - (1.4
k
* suction)] > 45.
During the compressor stop cycle, the Oil Pump is used for
a postlube operation that is performed to help unload the
Slide Valve. During the postlube, the Oil Pump will be turned
on for five minutes or until the Slide Valve is unloaded to or
below the “Highest Slide Valve position to allow starting the
compressor” setpoint. The compressor can not be restarted
unless the Slide Valve is less than the “Highest Slide Valve
position to allow starting the compressor” setpoint. If the
Slide Valve does not unload below this setpoint within five
minutes, the alarm message “Compressor Unload Failure -
Alarm” is issued.
Dual Pumps are enabled in Factory Setup. The lead pump is
the pump selected to be the first pump to run. If the lead pump
has a pump auxiliary failure, an alarm message is issued
and the other pump will be turned on. If the compressor has
a “Low Oil Pressure Alarm” failure, the second pump will be
turned on; then after a 30 seconds delay, the lead pump will
be turned off. If while the compressor is running the second
pump has an auxiliary failure or low Oil Pressure is encoun-
tered, a shutdown message and action is issued.
CONTROL SETUP - ”SLIDE VALVE SET-
Liquid Injection is enabled; then, the Filter Pressure value
equals the Discharge Pressure reading minus the Oil Pres-
sure reading.
This screen has the following setpoints:
High Filter Pressure Alarm - If the Filter Pressure is
greater than or equal to this setpoint, for the alarm time
delay, an alarm occurs.
High Filter Pressure Shutdown - If the Filter Pressure
is greater than or equal to this setpoint, for the shut-
down time delay, the compressor will shut down.
High Filter Pressure Alarm Delay - The minimum time
in seconds that the Filter Pressure is greater than or
equal to the High Filter Pressure Alarm setpoint before
notification of the alarm.
High Filter Pressure Shutdown Delay - The minimum
time in seconds that the Filter Pressure is greater than
or equal to the High Filter Pressure Shutdown setpoint
before the compressor will shut down.
Overview of the Oil Pump Operation
A Prelube Pump is turned on if the slide valve is too high.
While the compressor is running the Prelube Pump is turned
off. A Full Time Pump is always turned on while the compres-
sor is starting and running. The Cycling Pump is cycled on and
off while the compressor is running in response to the pres-
sure differential calculation. The differential equals the Dis-
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