Elmo Rietschle C-VLR 301 - Manual (Page 26)

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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
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)
Pumping capacity is
insuffi cient The mesh fi lter is dirty Clean or replace the fi lter Section 7.2.2
Section 7.4
The suction pipe is too long or
too narrow Check the hose or the pipe Section 5.3
Machine or system leaking Check the pipework and
screw connections for leaks
and to ensure that they are
fi rmly seated. Section 7.2
Final pressure (max.
vacuum) is not
reached Machine or system leaking Check the pipework and
screw connections for leaks
and to ensure that they are
fi rmly seated. Section 7.2
Machine gets too hot Ambient or intake temperature
is too high Ensure it is being used prop-
erly Section 2.3
Cooling air supply is ob-
structed Check environmental condi-
tions Section 5.1
Clean ventilation slots Section 7.2
The machine makes
an abnormal noise Deposits on the rotary piston Clean the working space and
the rotary piston Elmo Rietschle
Service
Please contact Elmo Rietschle Service for other malfunctions or those that cannot be eliminated.
8 Malfunctions: Causes and elimination