Leroy-Somer E27 Series, Installation & Maintenance

Page: 92 / 112

Troubleshooting and fault elimination
INTORQ | BA 14.0197 | 06/2014 45
8 Troubleshooting and fault elimination
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 measures, please
contact the customer service.
Maloperation of the brake
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 the coil resistance using a multimeter:
- Compare the measured resistance with the nominal
resistance. Values, see 15. If resistance 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 (see Defective rectifier, volt-
age too low).
Wiring defective or wrong
❚
Check and correct
❚
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 ok:
- Check rectifier,
- Replace defective rectifier
- Diode defective, use suitable new rectifier
❚
Check the coil for winding short or ground short.
❚
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.