Malfunctions
29
9
Malfunctions
Please note the following instructions should the pump malfunction:
9.1
Rectifying malfunctions
CAUTION
Hot surface!
Danger of burns if hot parts are touched. The surface temperature of the pump may rise
above 105 °C in case of malfunction.
Carry out work on the pump only after it has cooled to a safe temperature.
NOTICE
Motor overload!
Depending on the malfunction (e.g. blocking during cold start), the motor may not be
sufficiently protected by the built-in thermal protection switch from damage through
overheating.
Implement an additional network safety device.
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 protec-
tion; check motor switch
Pump temperature too low
Warm up pump to > 12 °C
Thermal protection switch has re-
sponded
Detect and fix cause of overheating; allow
pump to cool off if necessary.
Pump system dirty
Clean pump; contact Pfeiffer Vacuum Ser-
vice if necessary.
Pump system damaged
Clean and overhaul pump; contact Pfeiffer
Vacuum Service if necessary.
Motor defective
Replace motor
Pump switches off af-
ter 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
ultimate pressure
Measurement reading is false
Check gauge, check ultimate pressure with-
out installation connected.
Pump or connected accessories
are dirty
Clean pump and check components for con-
tamination.
Operating fluid dirty
Operate pump for a longer period with gas
ballast valve open or change operating 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-dimensioned
Keep connections as short as possible and
ensure that cross-sections are sufficiently
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
Radial shaft seal ring leaky
Replace seal ring and check bushing
Operational loss of operating fluid,
without ONF/OME
Install oil mist filter and oil return unit
Operational loss of operating fluid,
with ONF/OME
Clean oil mist filter and oil return unit,
change filter respectively
