Troubleshooting And Fault Elimination - Wittur servogearless WSG-S3.4 Instructions De Service

Troubleshooting and fault elimination

8 Troubleshooting and fault elimination
If any malfunctions should occur during operations, please check for possible causes based on the following
table. If the fault cannot be fixed or eliminated by one of the listed measures, please contact customer ser-
vice.
Fault Cause
Brake cannot be Coil interruption
released, air gap is
not zero
Coil has contact to
earth or between wind-
ings
Wiring defective
or incorrect
Defective or incorrect
rectifier
Incorrect micro-switch
wiring
Micro-switch incor-
rectly set
Brake cannot be Air gap "s
released, air gap is
not zero
INTORQ | BA 14.0196 | 04/2016
Remedy
❚ Measure the coil resistance using a multimeter:
- If resistance is too high, replace the complete stator.
❚ Measure coil resistance with multimeter:
- Compare measured value with rated resistance.
- Values:
- If resistance is too low, replace the complete stator.
❚ Check coil for short circuit to ground using a multimeter:
- Replace the complete stator if short circuit to ground is detected.
❚ Check brake voltage (see "defective rectifier, voltage too low").
❚ Check and correct.
- Check cable for continuity using a multimeter:
❚ Replace the complete stator if a cable is defective.
❚ Measure rectifier DC voltage using a multimeter.
If DC voltage is zero:
❚ Check AC rectifier voltage. If AC voltage is zero:
- Switch on power supply.
- Check fuse.
- Check wiring.
If AC voltage is OK:
- Check rectifier.
- Replace the defective rectifier.
If DC voltage is too low:
- Check rectifier.
- If diode is defective, use a suitable new rectifier.
❚ Check coil for inter-turn fault or 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.
Check the wiring of the micro-switch and correct it.
Replace the complete stator and make a complaint about the setting of
the micro-switch
to the manufacturer.
" is too large ❚ For adjustable brakes:
L
- Readjust air gap.
❚ For non-adjustable brakes:
- Replace all rotors.
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