Low Oil Pressure Alarm Delay - The minimum time
in seconds that the Oil Pressure is less than or equal
to the Low Oil Pressure Alarm setpoint before
notification of the alarm.
Low Oil Pressure Shutdown Delay - The minimum
time in seconds that the Oil Pressure is less than or
equal to the Low Oil Pressure Shutdown setpoint
before the compressor will shut down.
Low Oil Pressure Alarm and Shutdown - Is
determined by the type of pump and its running mode,
and from the pressure differential of the Oil Pressure
reading above or below the Discharge Pressure
reading.
The following tables show the setup of the Oil Setpoints
that can not be modified:
Running Full Lube Pump and Running Cycling Pump Oil
Pressure - Discharge Pressure = Oil Pressure Differential
Alarm Shutdown
Oil Pressure Differential 10 PSID 5 PSID
Time Delay 30 sec. 10 sec.
Other Manufacture’s Compressor Pump (Full Lube) Oil
Pressure - Discharge Pressure = Oil Pressure Differential
Alarm Shutdown
Oil Pressure Differential 25 PSID 20 PSID
Time Delay 5 sec. 5 sec.
Prelube Pump and Not Running Cycling Pump Discharge
Pressure - Oil Pressure = Oil Pressure Differential
RWBII Alarm Shutdown
Oil Pressure Differential
25 PSID 30 PSID
Time Delay 30 sec. 10 sec.
RXF and RXB Alarm Shutdown
Oil Pressure Differential 35 PSID 40 PSID
Time Delay 30 sec. 10 sec.
Additionally a safety check is made for low oil flow that will
stop the compressor from loading or force the compressor
to unload. This check is made only for a RWB with prelube
or a RXB with no pump:
• If [Oil Pressure <= (1.5 x Suction Pressure) + 10
lb.] then the compressor will be forced to unload
to 50% slide valve. If this condition is reached the
message Forced Unload - Low Oil Flow is shown
on the Operating Status screen.
• If [oil pressure <= ((1.5 x suction pressure) + 15
lb.) and (Slide Valve >= 48%)] then the
compressor will be prevented from further
loading. If this condition is reached the message
Stop Load - Low Oil Flow is shown on the
Operating Status screen.
NOTE: Refer to OIL SAFETY LOGIC Flowchart for
more information.
The following special selections are on this screen:
[Main Oil Injection] - This selection is only available
if Main Oil Injection was enabled in Factory Setup.
The following Oil Setpoints are on this screen:
On at Discharge Temperature - If the high
stage compressor is running and the Discharge
Temperature is greater than or equal to this
setpoint, for the time delay, the Main Oil Injection
Discharge Temperature output on digital board
#2 is energized
On at Discharge Temperature Delay - The
minimum time in seconds that the Discharge
Temperature is less than or equal to the On at
Discharge Temperature setpoint before the Main
Oil Injection Discharge Temperature output on
digital board #2 is energized.
[Liquid Injection] - This selection is only available if
the compressor has Liquid Injection oil cooling and it
was enabled through Factory Setup. This selection
displays the Liquid Injection Cooling screen. Liquid
Injection controls the supply of liquid refrigerant to the
compressor. Liquid Injection is off (the solenoid is
closed) if the compressor is off.
This screen has the following setpoints:
Oil Temperature On at - While the compressor
is running, if the Oil Temperature equals or
exceeds this setpoint, for the delay time, the
Liquid Injection output will be energized or turned
on to open a liquid valve. If the output is
energized it will be de-energized or turned off, if
the Oil Temperature is 1 °C below this setpoint.
Oil Temperature Delay - The minimum time in
seconds that the Oil Temperature is greater than
or equal to the Oil Temperature On at setpoint
when the compressor is running, before the
Liquid Injection output is turned on.
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 Liquid Injection is enabled;
then, the Filter Pressure value equals the Discharge
Pressure reading minus the Oil Pressure reading.
FRICK QUANTUM™ COMPRESSOR CONTROL PANEL S90-010 O
OPERATION Page 33
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