BOC E2M28, Instruction Manual

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E2M28 and E2M30 Rotary Vacuum Pumps
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34
Issue K 34 Jul 05
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 (three phase motors only).
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.