10 Malfunctions
CAUTION
Danger of injury from moving parts
After a power failure or a standstill as a result of overheating, the motor restarts automatically. There
is a risk of injury to fingers and hands if they enter the operating range of rotating parts.
► Safely disconnect motor from the mains.
► Secure the motor against reactivation.
► Dismantle the vacuum pump for inspection, away from the system if necessary.
CAUTION
Danger of burns on hot surfaces
In the event of a fault, the surface temperature of the vacuum pump can increase to above 105 °C.
► Allow the vacuum pump to cool down before carrying out any work.
► Wear personal protective equipment if necessary.
NOTICE
Danger of property damage from improper maintenance
Unprofessional work on the vacuum pump will lead to damage for which Pfeiffer Vacuum accepts no
liability.
► When ordering spare parts, specify the information on the nameplate.
Should malfunctions occur, you can find information about potential causes and how to fix them here:
Problem
Possible causes
Remedy
Vacuum pump will not start
up
● No mains voltage or volt-
age does not correspond
to the motor data
● Check the mains voltage and
mains fuse
● Check the motor switch.
● Pump temperature too
low
● Heat the vacuum pump to
>12 °C.
● Thermal protection switch
has triggered
● Determine and eliminate the
cause.
● Allow the vacuum pump to cool
down as required.
● Pumping system dam-
aged
● Contact
● Motor faulty
● Replace the motor.
● Contact
● Coupling defective
● Contact
Vacuum pump switches off
after a while after being
started
● Thermal protection switch
of the motor has triggered
● Determine and eliminate the
cause of overheating.
● Allow the motor to cool down as
required.
● Mains fuse triggered due
to overload (e.g. cold
start)
● Bring vacuum pump to permissi-
ble ambient temperature range.
● Exhaust pressure too
high
● Check exhaust line outlet open-
ings and exhaust side accesso-
ries.
Malfunctions
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