Elmo Rietschle V-VC 400/500/700/900/1100/1300 - Manual (Page 28)

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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 qualifi ed electrician Section 5.5
Connection to motor terminal
board is not correct
Motor protection switch is not
set correctly
The pump must be started
against a closed valve or an
existing vacuum. Use a soft start device (acces-
sory)
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 orIEC 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
Pumping capacity is
insuffi cient 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
fi rmly seated. Section 7.2
Intake fi lters are dirty Clean or replace the intake
fi lter Section 7.2.2
8 Malfunctions: Causes and elimination