Elmo Rietschle V-VTN 16/26/41 - Manual (Page 25)

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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)
The regulating valve is dirty so
that the permissible vacuum
value is exceeded. Clean or replace the regulat-
ing valve Section 7.2
Section 7.4
Pumping capacity is
insuffi cient The intake fi lter is dirty Clean or replace the intake
fi lter Section 7.2.1
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
Blades are damaged Replace blades Section 7.2.2
Section 7.4
8 Malfunctions: Causes and elimination