Edwards E2MO.7 - 7 Fault Finding; The Pump Has Failed to Start; The Pump Fails to Achieve Specified Performance; Vacuum)

7. Fault nding
A list of fault condions and their possible causes is provided here to assist in basic
fault‑nding. If unable to recfy 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 operang voltage does not match that of the motor.
▪
The exhaust lter 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 aer long storage or has been le to stand aer pumping
contaminants.
▪ The motor is faulty.
7.2 The pump fails to achieve specied performance (failure to reach
ulmate 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 lled with the wrong type of oil.
▪ The oil is contaminated.
▪ The pump has not primed.
▪
The vacuum ngs are dirty.
▪ The inlet-lter 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 parcles.
▪
One of the pump blades is scking.
7.4 The pump surface temperature is above 100 °C
▪
The ambient temperature is too high.
▪
The cooling-air supply is insucient or is too hot.
▪
The cooling-air supply is blocked.
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A37132880_F - Fault nding