Troubleshooting And Fault Elimination - Wittur WSG-S1.2 Manual De Instrucciones

j | BA 14.0197 | 11/2010
8

Troubleshooting and fault elimination

8 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
Brake does not release
Rotor cannot rotate freely
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Cause
Coil is interrupted
Coil has interturn fault or short circuit to
ground
Wiring incorrect or defective
Rectifier defective or wrong
Incorrect wiring of microswitch
Incorrect setting of microswitch
Air gap too large
Wrong setting of manual release
Air gap "s " too small
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Remedy
Measure coil resistance using multimeter:
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– If resistance is too high, replace the complete
stator.
Measure coil resistance using multimeter:
|
– Compare measured resistance to rated
resistance. For values, see ^ 15. If the
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,
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voltage too low").
Check and correct wiring.
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Check cable continuity using a multimeter:
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– Replace defective cable.
Measure the DC voltage at the rectifier using a
|
multimeter.
If DC voltage is zero:
Measure AC voltage at the rectifier.
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If AC voltage is zero:
– Apply voltage
– Check fuse
– Check wiring
If AC voltage is ok:
– Check rectifier
– Replace defective rectifier
Check coil for fault between turns and short
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circuit to ground.
If the rectifier defect occurs again, replace the
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complete stator, even if no fault between turns or
short circuit to ground can be detected. The fault
may only occur when warm.
Check the wiring of the microswitch and correct it.
Replace the complete stator and advise the
manufacturer of incorrect microswitch setting.
Adjust air gap (^ 26)
Measure rotor thickness and compare with minimum
rotor thickness (^ 3.2). If necessary, replace rotor.
Check dimension "s+s " with energised brake. The
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dimension must be identical at both sides. Correct if
necessary.
Check air gap "s " and readjust it, if necessary
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(chapter 4.4.4).