11 Malfunctions
11.1 General
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 70 °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.
► We recommend taking advantage of our service training offering.
► When ordering spare parts, specify the information on the nameplate.
Vacuum pump and electronic drive unit malfunctions always result in a warning or error message. In
both cases, you will receive an error code that you can read out via the interface of the electronic drive
unit. If an error occurs, the vacuum pump switches off.
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 supply voltage or
voltage does not corre-
spond to the motor data
● Check the supply voltage.
● Pump temperature too
low
● Heat the vacuum pump to a tem-
perature of > 5°C.
● Thermal protection of
the motor has triggered
● Identify and eliminate the cause
and allow vacuum pump to cool if
necessary.
● Diaphragms or valves
dirty
● Clean the vacuum pump.
● Overpressure in the ex-
haust lead
● If required, check and clean the
exhaust line.
Vacuum pump switches off
after a while after being start-
ed
● Thermal protection of
the motor has triggered
● Identify and eliminate the cause
and allow vacuum pump to cool if
necessary.
● Exhaust pressure too
high
● Check exhaust line outlet open-
ing and exhaust side accesso-
ries.
Vacuum pump does not
reach the specified ultimate
pressure
● Condensate in the vac-
uum pump
● Operate the vacuum pump at at-
mospheric pressure for a longer
period.
● Soiled valves or dia-
phragms
● If necessary, clean or replace the
valves and diaphragms.
● Leak in system
● Locate and eliminate the leak.
Malfunctions
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