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Problem solving
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:
No voltage or wrong voltage
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
Check if foreign material has entered the pump.
If necessary install an inlet filter to prevent foreign material
entering the pump
Air consumption exceeds air delivery of pump
Check equipment connected
Too high pressure drop between process and
pump inlet (Vacuum pump) or pump outlet
(Over-pressure pump)
Check the process lines for correct size and for leakage. Correct
if necessary
Pump element out of order
Check vacuum relief valve (Vacuum pump) or
safety valve (Over-pressure pump)
Check rotation direction of the motor
Change rotation direction of the motor
Inlet non-return valve is blocked
Internal parts are worn or damaged
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.
Pump element out of order
Ambient temperature too high
Inlet temperature too high
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