BOC Edwards A343-10-940, Instruction Manual

Page: 40 / 48

E1M18 and E2M18 Rotary Vacuum Pumps
MAINTENANCE
PAGE
34
Issue L 34 Sep 06
5.11.3 The pump fail to achieve specified performance (failure to reach ultimate vacuum)
• Your 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.
• You have filled the pump 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.
• The motor shaft rotates in the wrong direction.
5.11.4 The pump is noisy
• The motor fan-cover is damaged.
• The coupling and fan assembly are poorly adjusted.
• The motor coupling is loose.
• The motor bearings are worn.
• The oil is contaminated with solid particles.
• One of the pump blades is sticking.
5.11.5 The pump surface temperature is above 100
o
C
• The ambient temperature is too high.
• The cooling-air supply is insufficient or is too hot.
• The cooling-air supply is blocked.
• The electrical supply voltage is too high.
• The exhaust filter or exhaust line is blocked.
• The oil level is too low.
• The pump is filled with the wrong type of oil.
• The oil is contaminated.
• The process gas is too hot, or the throughput is too high.