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7.5
Electric control of the brake
Mode of functioning
The disk brake is supplied through a rectifier circuit. It operates according to the fail-safe principle. If there is a power
failure, the brake acts automatically so that the load is held securely in every position. To shorten the braking time the
brake is operated in a DC circuit. The different methods of connection in direct control and low voltage control can be
seen in the respective wiring diagram.
7.6
Troubleshooting on the brake
Faults
Causes
Remedy
Brake does not
release, air gap is not
zero
Coil has contact to ground or
between the windings
Replace the brake
Wiring wrong or defect
Check and correct wiring
Rectifier defective or wrong
Compare wiring at rectifier with wiring diagram; especially correct
setting of the bridge. Measure DC
– voltage between terminals 5 and
6. If differences occur change the rectifier
Air gap too large
Replace the brake
Table 12: Troubleshooting and fault elimination
If rectifier defects occur repeatedly, the brake shall be replaced even if no winding short circuit can be
detected. Defect may occur only in warm operating condition.
7.7
Functional check of the brake
When braking the nominal load during lowering the brake travel shall not exceed two chain link lengths.
The load shall not be stopped jerkily.
Summary of Contents for STAGEKET
Page 55: ...55 13 Example of Declaration of Conformity...
Page 56: ...56 14 Example of Declaration of Incorporation...
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