Pfeiffer Vacuum COMBILINE WD 1600, Operating Instructions Manual

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Malfunctions
21
7 Malfunctions
Please note the following instructions should the pumping station malfunction:
Problem Possible causes Remedy, please refer to component
operating instructions
Pumping station
does not start No mains voltage or voltage does not
correspond to the motor data Check mains voltage and mains fuse pro-
tection; check motor switch.
Thermal protection switch has re-
sponded Backing pump/Roots pump
Suction chamber dirty Roots pump
Gear wheels damaged Roots pump
Pumping system dirty Backing pump
Pumping system damaged Backing pump
Motor defective Backing pump/Roots pump
Pumping station
switches off after a
while after being
started Thermal protection switch of the motor
has responded Backing pump/Roots pump
Mains fuse protection triggered due to
overload (e. g. cold start) Backing pump
Exhaust pressure too high Backing pump
Pumping station
does not attain ulti-
mate pressure Pump or connected accessories are
dirty Backing pump/Roots pump
Operating fluid/Lubricant dirty Backing pump/Roots pump
Backing pump faulty Backing pump
Leak in system Localize/repair leak
Dirty or damaged overflow valve Roots pump
Operationl loss of lubricant at the oiler Roots pump
Operating fluid filling level too low
Backing pump
Pumping speed too
low Intake line not well-dimensioned Keep connections as short as possible and
see that cross-sections are sufficiently di-
mensioned
Exhaust pressure too high Check opening of exhaust line and exhaust
accessories
Loss of operating
fluid Casing seal leaky,
operational loss of operating fluid Backing pump
Radial shaft seal ring leaky Backing pump
Unusual operating
noises Suction chamber dirty Roots pump
Silencer dirty Backing pump
Bearings or gear wheels damaged Backing pump/Roots pump
Dirty overflow Roots pump
Motor bearing defective Backing pump/Roots pump
Motor runs - pump doesn’t:
only valid for pumps with magnetic
coupling system Roots pump