Troubleshooting and fault elimination
Kendrion INTORQ | BA 14.0223 | 04/2022
48
9
Troubleshooting and fault elimination
If any malfunctions should occur during operations, please check for possible causes based on the follow-
ing table. If the fault cannot be fixed or eliminated by one of the listed steps, please contact customer ser-
vice.
Fault
Cause
Remedy
Brake cannot be re-
leased, air gap is not zero
Coil interruption
¾
Measure coil resistance using a multimeter:
– If resistance is too high, replace the complete
spring-applied brake.
Coil has contact to earth or be-
tween windings
¾
Measure coil resistance using a multimeter:
– Compare the measured resistance with the nomi-
nal resistance. Refer to Coil data for the values. If
resistance is too low, replace the complete stator.
¾
Check the coil for short to ground using a multimeter:
– If there is a short to ground, replace the complete
spring-applied brake.
¾
Check the brake voltage (refer to section on defective
rectifier, voltage too low).
Wiring defective or wrong
¾
Check the wiring and correct.
¾
Check the cable for continuity using a multimeter
– Replace a defective cable.
Rectifier defective or incorrect
¾
Measure rectifier DC voltage using a multimeter.
¾
If DC voltage is zero:
¾
Check AC rectifier voltage.
¾
If AC voltage is zero:
– Switch on power supply
– Check fuse
– Check wiring.
¾
If AC voltage is okay:
– Check rectifier,
– Replace defective rectifier
¾
Check coil for inter-turn fault or short circuit to ground.
¾
If the rectifier defect occurs again, replace the entire
spring-applied brake, even if you cannot find any fault
between turns or short circuit to ground. The error may
only occur on warming up.
Brake cannot be re-
leased, air gap is not zero
Air gap too big
¾
For spring-applied brake Kendrion INTORQ
BFK557-06 ... 12, replace the brake.
