Edwards XDS46i

7. Fault nding
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 congured.
▪
The inverter drive has not reset aer an over temperature event. Disconnect the
mains supply and wait for at least one minute and aempt to restart.
▪
The motor is faulty.
▪
Fan not working or not connected.
▪
The ambient temperature is too high.
▪
The cooling air supply is insucient or is too hot.
▪
The process gas is too hot or the throughput is too high.
7.2 The pump has failed to achieve the required performance
▪
The pump gas ballast may be selected. To close the gas ballast (if ed), turn the
control to posion '0'. Use this seng in order to achieve the best possible
vacuum. If the pump has been used to pump condensable vapours or is to pump a
large chamber that has been exposed to atmospheric air (water vapour), it may be
necessary to run for at least an hour on high ow gas ballast 'II'.
▪
If the electrical supply voltage is more than 10% below the lowest voltage specied
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 indicaon of pressure.
▪ The vacuum ngs 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 specied range of operang condions.
▪
The gas ballast control (if ed) is not properly closed.
▪
The p seals need replacing.
▪
The inverter is current liming the supply.
▪
The pump is in idle mode.
7.3 The pump is noisy
▪
The pump is contaminated with solid parcles.
▪
The bearings are worn.
▪
Following p seal replacement, the pump has not been vented and a build up of
eroded p seal dust is reducing running clearances. Refer to Replace the p seals
on page 28 for further informaon.
Page 30
A73101880_F - Fault nding