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Malfunctions: Causes and elimination
8
Malfunctions: Causes and elimination
Malfunction
Cause
Elimination
Note
Machine is switched
off by the motor pro-
tection switch
Mains voltage/ Frequency
does not correspond with
the motor data
Check by qualified electrician
Connection to motor ter-
minal 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 turn-
off delay that considers the short
excess current at start up (version
with short circuit and overload
trigger as per VDE 0660 Part 102
or IEC 60947-4-1)
Suction capacity is
insufficient
The mesh filter is plugged
Clean / replace the mesh filter
The inlet pipe is too long or
too narrow
Check the hose and/or the pipe
Machine or system leaking
Check the pipework and screw
connections for leaks and check
for tight fit
Final pressure (max.
vacuum) is not
reached
Machine or system leaking
Check the pipework and screw
connections for leaks and check
for tight fit
Not enough cooling water
Observe cooling water
consumption
The mesh filter is plugged
Clean / replace the mesh filter
Machine gets too
hot
Ambient or inlet tempera-
tures too high
Ensure proper use
The cooling water system is
obstructed
Check the cooling water system
and the inlet pipes
Not enough cooling water
Observe cooling water
consumption
Cooling water inflow is too
hot
Observe the max. inlet
temperature
The machine makes
a strange noise
Deposits on the rotors
Clean the working space and the
rotors
Elmo Ri-
etschle
Service
Please contact Elmo Rietschle Service for other malfunctions or those that cannot be eliminated.