Problem
Possible causes
Remedy
Vacuum pump switches off
after a while after being start-
ed
● Thermal protection of the
drive has triggered
● Determine and eliminate the
cause of overheating.
● Allow the vacuum pump to cool
down as required.
● Exhaust pressure too
high
● Ensure that the exhaust line is
depressurized.
Vacuum pump does not
reach the specified ultimate
pressure
● Measurement result dis-
torted
● Check the measurement instru-
ment.
● Check the ultimate pressure
without system connected.
● Vacuum pump or con-
nected accessory conta-
minated
● Clean the vacuum pump.
● Check the components for con-
tamination.
● Operating fluid contami-
nated
● Change the operating fluid.
● Operating fluid level too
low
● Top up the operating fluid.
● Leak in system
● Locate and eliminate the leak.
● Vacuum pump is dam-
aged
● Contact
.
Pumping speed of vacuum
pump too low
● Poor dimensioning of
vacuum line
● Make sure that connections are
short and cross sections ade-
quately dimensioned.
● Rotation speed of pump
is too low
● Check the signals at the control
input.
● Exhaust pressure too
high
● Ensure that the exhaust line is
depressurized.
Loss of operating fluid
● Operating fluid separator
leaking
● Check for leaks.
● Replace the seal as required.
● Radial shaft seal rings
(RSSR) leaking
● Check the RSSR.
● Contact
.
● Operational loss of oper-
ating fluid
● Check the exhaust filter and re-
place if necessary.
Unusual noises during opera-
tion
● Drive coupling is worn
● Replace the coupling parts.
● Pumping system conta-
minated or damaged
● Clean and maintain the vacuum
pump.
● Contact
.
● Motor bearing is defec-
tive
● Change the motor.
● Contact
.
Tbl. 10:
Troubleshooting for rotary vane pumps
Malfunctions
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