Problem
Possible causes
Remedy
Vacuum pump switches off after a
while after being started
● Thermal protection
of the drive has trig-
gered
● 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 final pressure
● Measurement result
distorted
● Check the measurement instru-
ment.
● Check the final pressure without
system connected.
● Vacuum pump or
connected accesso-
ry contaminated
● Clean the vacuum pump.
● Check the components for con-
tamination.
● Operating fluid con-
taminated
● 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
damaged
● Contact Pfeiffer Vacuum Serv-
ice.
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
● Check the exhaust line for clear
passage.
Loss of operating fluid
● Operating fluid sep-
arator leaking
● Check for leaks.
● Replace the seal as required.
● Operational loss of
operating fluid
● Check the exhaust filter and re-
place if necessary.
Unusual noises during operation
● Pumping system
contaminated or
damaged
● Clean and maintain the vacuum
pump.
● Contact Pfeiffer Vacuum Serv-
ice.
● Pump bearing de-
fective
● Contact Pfeiffer Vacuum Serv-
ice.
Red LED on the electronic drive
unit illuminates
● Group error
● Switch the current supply off and
back on.
● Press
.
● Set the parameter
[P: 010]
to "0"
and subsequently acknowledge
with "1" via the RS-485 interface.
● Set the parameter
[P: 009]
to "1"
via the RS-485 interface.
● Connect V+ on Pin 13 to "re-
mote".
● Carry out a differentiated mal-
function analysis with a control
unit.
● Contact Pfeiffer Vacuum Serv-
ice.
Tbl. 18:
Troubleshooting for rotary vane pumps
12.2 Error codes
Errors (** Error E–––– **) always cause the vacuum pump and connected peripheral devices to be
switched off.
Warnings (* Warning F –––– *) are only displayed and do not cause components to be switched off.
Malfunctions
55/68
