© Edwards Limited 2007. All rights reserved. Page 23
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Maintenance
A730-01-880 Issue E
z There is a leak in your vacuum system.
z Your pressure measurement technique or gauge head is unsuitable or gives an incorrect indication of
pressure.
z Your vacuum fittings are dirty or damaged.
z The inlet strainer is blocked.
z There is a blockage or high pressure in the exhaust line.
z The pump contains traces of process vapours.
z The pump is outside the specified range of operating conditions.
z The gas ballast control is not properly closed.
z The tip seals need replacing.
z The inverter is current limiting the supply.
z The pump is in idle mode.
5.8.3 The pump is noisy
z The pump is contaminated with solid particles.
z The bearings are worn.
z 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 Section 5.6 for further information.
5.8.4 The pump surface temperature is high
z The ambient temperature is too high.
z The cooling air supply is insufficient or is too hot.
z The process gas is too hot or the throughput is too high.
5.8.5 The pumping speed is poor or if pump down time is too long
z The connecting pipelines are too small in diameter.
z The connecting pipelines are too long.
z The inlet strainer is blocked.
z There is a leak in the system.
z The inverter is current limiting the supply.
z The pump is in idle mode.
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