Fault repair
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23
VCM 44
8.2
Faults in the electronic equipment
Motor overheats
(only verifiable by mea-
surement)
Mains voltage deviates by more than 5%
from motor nominal voltage.
(See ” Machine Data” on page 9.)
Higher voltages are particularly unsuitable
for high polarity motors, since their no-load
current is close to the nominal current even
at normal voltages.
provide correct mains voltage.
Motor is delta connected but designed for
star connection
Install switching correctly
Motor overloads
Reduce motor over-load by lesser
loads.
Nominal operating time is exceeded.
observe permissible operating time.
Nominal duty type is exceeded.
If for example the motor overheats because
of too frequent switching, it is not sufficient to
use a larger motor, since the same condi-
tions will occur.
Restrict operation to the prescribed con-
ditions of operation. Consult Stephan
servicing personnel to determine the ap-
propriate drive.
Cooling air mass is too low, e.g., the cooling
air paths are blocked.
ensure unimpeded access and exit for
cooling air. Clean cooling fins
Cooling air has warmed up.
provide fresh air, repair aerator.
Motor growls
Motor is wrongly connected.
call in specialists to test and correct.
Faults
Possible reasons
Repair
Machine won’t switch
main switch is switched off
switch the main switch on
safety limit switch is switched on
close the lid
operating voltage is wrong
test the operating voltage
control fuse is damaged
replace control fuse
Functions won’t switch
excess-current cut-out works
reset excess current cut-out; call in special-
ists to test and repair the machine.
Faults
Possible reasons
Repair
