Fault Finding; The Pump Has Failed To Start Or Has Stopped; The Pump Has Failed To Achieve The Required Performance; The Pump Is Noisy - Edwards XDS35iC Instruction Manual

7. Fault finding

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 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 fitted), turn the
control to position '0'. Use this setting 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 flow gas ballast 'II'.
▪ 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 gas ballast control (if fitted) is not properly closed.
▪ The tip seals need replacing.
▪ The inverter is current limiting the supply.
▪ The pump is in idle mode.

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
on page 30 for further information.
A73001880_N
A73001880_N - Fault finding
Page 32
Replace the tip seals
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