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© Gardner Denver Schopfheim GmbH, Gardner Denver Deutschland GmbH
Malfunctions: Causes and elimination
Fault
Cause
Troubleshooting
Important
Machine is switched
off by the motor pro-
tection switch
Mains voltage/ Frequency
does not correspond with the
motor data
Check by qualified electrician
Section 5.5
Connection to motor terminal
board is not correct
Motor protection switch is not
set correctly
Motor protection switch is
triggered too quickly
Use a motor protection switch
with an overload-dependent
delayed switch off that takes
into consideration the short
term excess current at start
up (version with short circuit
and overload trigger as per
VDE 0660 Part 2 or IEC 947-4
Vacuum pump or its oil is too
cold
Note the ambient temperature
and the intake temperature
Section 2.3
The lubricating oil is too vis-
cous
The oil viscosity must comply
with ISO VG 100 as per DIN
51519
Section 7.2.3
The air oil removers are dirty.
Change the oil separator ele-
ments
Section 7.2.4
The back pressure is too high
when the exhaust air is being
discharged.
Check the hose or the pipe
Section 5.3
Permanent operation >100
mbar (abs.).
Use next largest motor output
Section 4.3
Suction capacity is
insufficient
The suction pipe is too long or
too narrow
Check the hose or the pipe
Section 5.3
Leak on the suction side of
the vacuum pump or in the
system
Check the pipework and
screw connections for leaks
and to ensure that they are
firmly seated.
Section 7.2
The intake filter is dirty
Clean or replace the intake
filter
Section 7.2.1
8
Malfunctions: Causes and elimination
