A732-01-880 Issue D
Page 22
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Maintenance
5.7
Fault-finding
5.7.1
The pump has failed to start or has stopped
The electrical supply fuse has blown.
The electrical supply voltage does not match that for which the inverter input has been configured.
The inverter drive has not reset after an over temperature event. Disconnect the mains supply and wait for
at least one minute and attempt to restart.
The motor is faulty.
Fan not working or not connected.
The ambient temperature is too high.
The cooling air supply is insufficient or is too hot.
The process gas is too hot or the maximum continuous operating pressure has been exceeded.
The exhaust pressure of the XDS100B is too high. Check operation of the booster backing pump and suitability
of the backing pump for the application.
5.7.2
The pump has failed to achieve the required performance
The exhaust pressure of the XDS100B is too high. Check suitability of the backing pump for the application.
If the electrical supply voltage is more than 10% below the lowest voltage specified on the voltage indicator,
the pump may operate yielding a degraded vacuum performance.
There is a leak in the vacuum system.
The pressure measurement technique or gauge head is unsuitable or gives an incorrect indication of
pressure.
The vacuum fittings are dirty or damaged.
The inlet strainer is blocked.
There is a blockage or high pressure in the exhaust line.
The pump contains traces of process vapours.
The pump is outside the specified range of operating conditions.
The tip seals need replacing.
The inverter is current limiting the supply.
The pump is in idle mode.
5.7.3
The pump is noisy
The pump is contaminated with solid particles.
The bearings are worn.
Following tip seal replacement, the pump has not been vented and a build up of eroded tip seal dust is
reducing running clearances. Refer to
for further information.
