26
Malfunctions
9.1 Troubleshooting
Problem
Mögliche Ursachen
Behebung
Pump will not start
up
No mains voltage or voltage
does not correspond to the
motor data
Check mains voltage and mains fuse pro-
tection; 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 Pfeif-
fer 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 triggered
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 pressure
Measurement reading is false
Check gauge, check final pressure wit-
hout installation connected
Pump or connected accessories
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 opera-
ting 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 neces-
sary
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 Pfeif-
fer 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; additional information at
www.pfeiffer-vacuum.net.
Î
Please state all the information on the pump rating plate when ordering spare parts.
