9 Fault nding
A list of fault conditions and their possible causes is provided to assist in
basic troubleshooting. If you are not able to rectify a fault, call your supplier
or your nearest Service Technology Centre for advice.
Fault
The pump has failed to start or has stopped
Cause The electrical supply fuse has blown.
Remedy Make sure that the external electrical supply is switched on and that the power indicator
LED (Figure: Interface control panel, (14)) is illuminated.
If the LED does not illuminate, contact us.
Cause The motor controller has not reset after an over temperature event.
Remedy Disconnect the main power supply and wait for at least one minute and attempt to
restart the pump. If the pump still does not start, contact us.
If the alarm indicator LED (Figure: Interface control panel, (5)) ashes, it indicates that the
pump has high current load from possibly a high inlet pressure/ow. Adjust the inlet
pressure/ow until the pump performance recovers.
Fault The pump has failed to achieve the required performance
Cause The pressure measurement technique or gauge head is not suitable or gives an
incorrect indication of pressure.
Remedy Make sure that the vacuum measurement equipment is calibrated and is updated. The
correct gauge range must be selected for the application. Contact us for further
assistance on gauge selection, if required.
Cause The vacuum ttings are dirty or damaged.
Remedy Make sure that the vacuum
ttings are clean and scratch free.
Cause There is a blockage or high pressure in the exhaust line.
Remedy Make sure that the exhaust valves
tted are not closed when the pump is in operation.
Cause The motor controller is current limiting the supply.
Remedy If the alarm indicator LED (
Figure: Interface control panel, (5)) ashes, it indicates that the
pump has high current load from possibly a high inlet pressure/ow. Adjust the inlet
pressure/ow until the pump performance recovers.
Cause The pump performance is different at the working application load.
Remedy The pump does not have a
at performance curve, peak pumping speed can vary with
inlet pressure and gas load. Check the actual performance against the performance
curve shown in Technical data on page 14.
Fault
The pump is noisy
Cause The pump is contaminated with solid particles.
Remedy Contact us or the supplier for further information.
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300902516_002 - 10/2020 - © Leybold
Fault nding
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