Edwards xds35i, Instruction Manual, Page: 29 / 40

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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.