© Edwards Limited 2014. All rights reserved. Page 25
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Maintenance
A366-04-880 Issue A
5.10 Test the motor condition
Test the earth continuity and the insulation resistance of the pump-motor, in accordance with local regulations for
periodic testing of electrical equipment. We recommend that the earth continuity is less than 0.1ohms and the
insulation resistance is greater than 10 Mohms. If the motor fails these tests, you must replace the motor.
5.11 Fit new blades
Fit new blades to the pump as described in the instructions supplied with the blade kit (see Section 7).
5.12 Basic fault-finding
A list of fault conditions and their possible causes is provided here to assist you in fault-finding. If you are unable to
rectify a fault when you use this guide, call your nearest Edwards Service Centre for help.
5.12.1 The pump has failed to start
The electrical supply fuse is blown
The electrical supply voltage does not match the motor
The outlet pipeline or the outlet-filter (if fitted) is blocked
The oil temperature is below 12°C
The oil is too viscous
The oil is contaminated
The pump has seized after long storage
The pump has been left to stand after contaminants have been pumped and has seized
The motor is faulty.
5.12.2 The pump fails to achieve its specified performance
(Failure to reach ultimate vacuum).
The measuring technique or gauge is unsuitable
You have filled the pump with the wrong type of oil
There is a leak in your vacuum system
The gas-ballast control is set incorrectly
The oil-level is low
The oil is contaminated
Your vacuum fittings are dirty or damaged
The inlet-filter is blocked
The pump has not warmed up
The pump has failed to prime
Motor is rotating in the wrong direction.
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