A730-01-880 Issue E
Page 22 © Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
5.5 Clean the external fan cover
If the fan cover is not kept clean, the air flow over the pump can be restricted and the pump may overheat.
1. Switch off the pump and disconnect it from the electrical supply.
2. Use a dry cloth and a soft brush to remove dirt and deposits from the fan cover.
5.6 Replace the tip seals
This instruction is applicable to the XDS35i replacement tip seal kit (contained in minor service kit, refer to
Section 7.3.5) that must be fitted.
5.7 Test the motor condition
CAUTION
Do not flash test the XDS35i or damage to the inverter may result.
Test the earth continuity and the insulation resistance of the pump motor, in accordance with local regulations for
the periodic testing of electrical equipment.
We recommend that the earth continuity is less than 0.1Ω and the insulation resistance is greater than 2MΩ.
(Reference EN61010-1).
If the pump fails these tests, you must contact Edwards.
5.8 Fault-finding
5.8.1 The pump has failed to start or has stopped
z The electrical supply fuse has blown.
z The electrical supply voltage does not match that for which the inverter input has been configured.
z 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.
z The motor is faulty.
z Fan not working or not connected.
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.
5.8.2 The pump has failed to achieve the required performance
z To close the gas ballast, 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’.
z 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.
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