Edwards A37104902, Instruction Manual

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7. Fault finding
A list of fault conditions and their possible causes is provided here to assist in basic
fault
‑
finding. If unable to rectify a fault when using this guide, call your supplier or our
nearest service centre for advice.
7.1 The pump has failed to start
▪ The electrical supply fuse has failed.
▪ The motor is incorrectly wired.
▪ The operating voltage does not match that of the motor.
▪ The exhaust filter or exhaust line is blocked.
▪ The oil temperature is below 12 °C.
▪ The oil is too viscous.
▪ The oil is contaminated.
▪ The pump is seized after long storage or has been left to stand after pumping
contaminants.
▪ The motor is faulty.
7.2 The pump fails to achieve specified performance (failure to reach
ultimate vacuum)
▪ The measuring technique or gauge is unsuitable.
▪ There is a leak in the external vacuum system.
▪ The gas-ballast control is open.
▪ The oil level is too low.
▪ The pump has been filled with the wrong type of oil.
▪ The oil is contaminated.
▪ The pump has not primed.
▪ The vacuum fittings are dirty.
▪ The inlet-filter is blocked.
▪ The pump has not warmed up.
7.3 The pump is noisy
▪ The motor fan-cover is damaged.
▪ The motor bearings are worn.
▪ The oil is contaminated with solid particles.
▪ One of the pump blades is sticking.
7.4 The pump surface temperature is above 100 °C
▪ The ambient temperature is too high.
▪ The cooling-air supply is insufficient or is too hot.
▪ The cooling-air supply is blocked.
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A37132880_F - Fault finding