Troubleshooting and fault elimination
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| BA 14.0190 - EN | 02/2007
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Troubleshooting and fault elimination
If any malfunctions should occur during operation of the drive system, please check the
possible causes using the following table. If the fault cannot be eliminated by one of the listed
measures, please contact the aftersales service.
Fault
Cause
Remedy
Brake cannot be released, air gap is
not zero
Coil is interrupted
|
Measure coil resistance using multimeter:
– If the resistance is too high replace the stator.
Coil has interturn fault or short circuit to
ground
|
Measure coil resistance using multimeter:
– Compare measured resistance to rated
resistance. For values, see chapter 3.3. If the
resistance is too low, replace the entire stator.
|
Test the coil for short circuit to ground using a
multimeter:
– If a short circuit to ground occurs, replace the
stator.
|
Check the brake voltage (see defective rectifier,
voltage too low).
Defective or wrong wiring
|
Check and correct wiring.
|
Check the cable using a multimeter:
– Replace defective cable
Defective or wrong rectifier
|
Measure the DC voltage at the rectifier using a
multimeter.
When the DC voltage is zero:
|
Measure the AC voltage at the rectifier.
When the AC voltage is zero:
– Apply voltage
– Check fuse
– Check wiring
When the AC voltage is ok:
– Check rectifier
– Replace defective rectifier
When the DC voltage is too low:
– Check rectifier
– If diode is defective, use suitable new rectifier
|
Check the coil for fault between turns and short
circuit to ground.
|
If the rectifier defect occurs again, replace the
entire stator, even if you cannot find any fault
between turns or short circuit to ground. The fault
may occur later during heating-up.
Incorrect wiring of microswitch
Check the wiring of the microswitch and correct it.
Incorrect setting of microswitch
Replace the stator and complain about the micro
switch quality at the manufacturer
Air gap too big
Readjust the air gap (chapter 7.3.1)
Rotor cannot rotate freely
Wrong setting of manual release
Check dimension s+s
Lü
with energised brake. The
dimension must be identical at both sides. Correct if
necessary.
Air gap s
Lü
too small
Check air gap s
Lü
and readjust it, if necessary
(chapter 7.3.1).
