Maintenance/repair
7
j
| BA 14.0196 | 05/2013
44
7.2.2
Release / voltage
1. Start motor and control system!
Danger!
The running rotor must not be touched.
Danger!
Live connections must not be touched.
2. Observe air gap ”s
L
” during operation of the drive. The air gap must be zero.
3. Measure the DC voltage at the brake.
– The DC voltage measured after the overexcitation time (see bridge/half-wave
rectifier,
36 must correspond to the holding voltage
37. A ±10 % deviation is
permissible.
7.3
Maintenance operations
Note!
Brakes with defective armature plates, cheese head screws, springs or counter
friction faces must always be replaced completely.
Generally observe the following for inspections and maintenance works:
| Remove oil and grease linked impurities using brake cleaning agents, if
necessary, replace brake after identifying the cause of the contamination.
Dirt deposits in the air gap between stator and armature plate impair the
function of the brake and must be removed.
| After replacing the rotor, the original braking torque will not be reached until
the run-in operation of the friction surfaces has been completed. After
replacing the rotor, run-in armature plates and counter friction faces have an
increased initial rate of wear.
7.3.1
Checking the rotor thickness
Danger!
The motor must not run during the check.
1. Stop motor and control system!
2. Remove the motor cover and seal ring, if mounted.
3. Measure the rotor thickness using a caliper gauge.
4. Compare the measured rotor thickness with the minimally permissible rotor thickness,
16.
5. If necessary, replace the complete rotor,
45 for description.
Summary of Contents for BFK455
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