KNF AC Motor M 43 Ex
Troubleshooting
Translation of original Operating and Installation Instructions, english, KNF 121218-121646 01/13
16
9. Troubleshooting
DANGER
Extreme danger from electrical shock!
Î
Disconnect the motor power supply before working
on the motor.
Î
Make sure the motor is de-energized and secure.
1. Check the motor (see Tab. 10).
2. Also see the drive-pump operating and installation instructions
for troubleshooting.
Tab. 10
Fault cannot be rectified
If you are unable to determine any of the specified causes, send
the motor to KNF Customer Service (see page 1 for the address).
If the motor is attached to a pump, observe the instructions for the
pump.
Fault
Motor
does
not
ramp up
Motor is
too
warm
Signifi-
cant
drop-off
in speed
Protec-
tion
device
trips
Possible Cause
Remedy
Load moment too high
Check motor and load
moment
Mains voltage too low
Check mains
Phase interruption
Check connection network
Overload
Compare output plate
specifications
Switches too often
Verify rated operation
mode
Insufficient ventilation
Inspect ventilation paths,
check turn direction
Ventilation
paths
dirty Clean
Winding or terminal short
circuited
Measure isolation resis-
tance
