Section VII - Problem Solving
The pump
cannot reach
stated vacuum
Membrane of vacuum control valve defect Replace membrane
Vacuum pump element out of order Consult Quincy
Air leakage Check the process lines for leakage
Pressure switch
trips
Oil separator elements clogged Have elements replaced
Oil filter clogged Have oil lter replaced
Discharge clogged Check couplings and outlet
Bypass valve or oil injection system clogged Have bypass valve cleaned or replaced.
Clean oil injection system
Pressure switch out of order Replace pressure switch
Vacuum pump
element outlet
temperature
above normal
Oil level too low
Check and correct, see Operation in-
structions / During operation
Insufficient cooling air or cooling air tem-
perature or relative humidity is too high
Check for cooling air restriction or im-
prove ventilation of the vacuum pump
room. Avoid recirculating of cooling air.
If installed, check capacity of vacuum
pump room fan
Oil cooler clogged Clean cooler
Oil filter clogged Replace oil filter
Scavenge line clogged Clean scavenge line
By-pass valve malfunctioning Have valve tested
Degraded oil
Check service intervals, see Preventive
maintenance schedule
Temperature of pressure air too high Check process air temperature
Vacuum pump element out of order Consult Quincy
Converter fault codes
If a problem is detected by the converter, a specic code (Main motor converter alarm)
will appear on the Airlogic display, together with a fault code. Below table lists the most
important error codes. If another code appears, please contact Quincy.
Typical display when the vacuum pump is stopped by a shutdown
(1) Shutdown
88 Quincy Vacuum Pump-QSV Series
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