Subject to changes without notice !
Änderungen vorbehalten !
Gearless Lift Machine
WSG-SF
Operating Instructions
EN
Code: GM.8.004284.EN
Date:
28. Jan 2020
Version: 0.16
Page: 108
Troubleshooting and eliminating faults
INTORQ | BA 14.0214 | 09/2017
47
8
Troubleshooting and eliminating faults
If any malfunctions should occur when operating the braking system, please check for possible causes
based on the following table. If the fault cannot be fixed or eliminated by one of the listed steps, please con-
tact customer service.
Brake malfunction
Fault
Cause
Remedy
Brake does not release
Coil interruption
❚
Measure coil resistance using a multimeter:
- If resistance is too high, replace the complete stator.
Coil has contact to earth or
between windings
❚
Measure coil resistance using a multimeter:
- Compare the measured resistance with the nominal
resistance. Refer to
16 for the values. If resist-
ance is too low, replace the complete stator.
❚
Check the coil for short to ground using a multimeter:
- If there is a short to ground, replace the complete
stator.
❚
Check the brake voltage (refer to section on defective
rectifier, voltage too low).
Wiring defective or wrong
❚
Check the wiring and correct.
❚
Check cable for continuity using a multimeter
- Replace defective cable.
Rectifier defective or incorrect
❚
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 okay:
- Check rectifier,
- Replace defective rectifier
- Diode defective - install an appropriate undamaged
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 error may only occur on
warming up.
Summary of Contents for WSG-SF Series
Page 111: ......
