Quincy Compressor QCV 045, Instruction Book

Page: 41 / 56

Section VII - Problem solving
41
Before carrying out any maintenance, repair work or adjustment,
 Stop the pump, close the isolation valve and wait for 3 minutes.
 Press the emergency stop button and switch off the voltage.
 Depressurize the pump by venting the process side of the
pump, if it is safe to do so.
 Open and lock the isolating switch.
 Lock the air inlet valve during maintenance or repair.
The operator must apply all relevant safety precautions.
Before electrical maintenance
Wait for at least 10 minutes before starting any electrical repairs
as dangerous high voltage remains on the capacitors of the start
and speed regulation unit during some minutes after switching off
the voltage.
Faults and remedies:
Cause Remedy
No voltage or wrong voltage Check power supply
Overload protection has tripped
Compare electrical data mentioned on data
plate/instruction book with setting of overload
protection.
Adjust setting of overload when setpoint is not
correct
Pump is blocked
Check if foreign material has entered the pump.
If necessary install an inlet filter to prevent
foreign material entering the pump
Motor damaged Consult Quincy
Air consumption exceeds air
delivery of pump
Check equipment connected
Clogged air inlet filter Replace filter
Too high pressure drop between
process and pump inlet
(Vacuum pump) or pump outlet
(Overpressure pump)
Check the process lines for correct size and for
leakage. Correct if necessary
Pump element out of order Consult Quincy
Inlet filter blocked Change inlet filter
Check vacuum relief valve
(Vacuum pump) or safety valve
(Overpressure pump)
Consult Quincy
Check rotation direction of the
motor
Change rotation direction of the motor
Inlet non-return valve is blocked Consult Quincy
Internal parts are worn or
damaged
Consult Quincy
Insufficient cooling air or cooling
air temperature or relative
humidity to high
Check for cooling air restriction or improve
ventilation of the pump room.
Avoid recirculating of cooling air.
If installed, check capacity of pump room fan.