26
Malfunctions
9.1 Troubleshooting
Problem
Possible causes
Remedy
Pump will not start
up
No mains voltage or voltage
does not correspond to the
motor data
Check mains voltage and mains fuse
protection; check motor switch
Pump temperature too low
Warm up pump to > 12°C
Thermal protection switch has
responded
Detect and fix cause of overheating;
allow pump to cool off if necessary.
Pump system dirty
Clean pump; contact Pfeiffer Vacuum
Service if necessary.
Pump system damaged
Clean and overhaul pump; contact
Pfeiffer Vacuum Service if necessary.
Motor defective
Replace motor
Pump switches off
after a while after
being started
Thermal protection switch of
the motor has responded
Detect and fix cause of overheating;
allow motor to cool off if necessary.
Mains fuse protection trigge-
red due to overload (e.g. cold
start)
Warm up pump
Exhaust pressure too high
Check opening of exhaust line and
exhaust accessories
Pump does not
attain final pres-
sure
Measurement reading is false
Check gauge, check final pressure wit-
hout installation connected.
Pump or connected accesso-
ries are dirty
Clean pump and check components for
contamination.
Operating fluid dirty
Operate pump for a longer period with
gas ballast valve open or change ope-
rating fluid
Leak in system
Repair leak
Operating fluid filling level too
low
Top off operating fluid
Pump damaged
Contact Pfeiffer Vacuum Service.
Pumping speed of
pump too low
Intake line not well-dimensio-
ned
Keep connections as short as possible
and see that cross-sections are suffi-
ciently dimensioned
Exhaust pressure too high
Check opening of exhaust line and
exhaust accessories
Loss of operating
fluid
Swivel gasket leaky
Check tightness; replace gasket if
necessary
Radial shaft seal ring leaky
Replace seal ring and check bushing
Operational loss of operating
fluid
If necessary, install oil mist filter and oil
return unit
Unusual operating
noises
Silencer dirty
Clean or replace the silencer.
Damage to the pump system
Clean and overhaul pump; contact
Pfeiffer Vacuum Service if necessary.
Motor bearing defective
Replace motor; contact Pfeiffer Vacuum
Service if necessary
NOTE
Service work should only be carried out by qualified personal!
Pfeiffer Vacuum is not liable for any damage to the pump resulting from work carried
out improperly.
Î
Take advantage of our service training programs from technical training; additional
information at www.pfeiffer-vacuum.net.
Î
Please state all the information on the pump rating plate when ordering spare parts.
