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Ensuring functional safety
4.8 Service and maintenance
4.8.7
Checking the friction lining and replacing the rotor
Unintentional starting of the drive unit
Switch off the power supply to the drive unit so that it is in a no-voltage condition.
The brake must be in a torque-free condition.
Secure the drive unit to prevent it from being started up unintentionally.
Attach a warning notice to the start switch.
Decrease of braking effect due to contamination
Do not allow oil or grease to come into contact with friction surfaces.
Note
Reactivate the friction lining at regular intervals
The friction lining must be reactivated at regular intervals if the brake is solely used as holding
brake without any dynamic load being applied. You can achieve reactivation of the friction lining
by applying friction work, e.g. by braking from moderate motion or slow movement. This should
be repeated several times.
Procedure
Checking the friction lining thickness (rotor)
1. Remove the fan cover
For the combination with manual brake release:
Unscrew the manual brake release lever
For separately driven fans:
Remove the fan cover with separately driven fan.
2. Release the connecting cable.
3. Remove the fan locking ring and pull out the fan.
4. Loosen the brake screws evenly and remove the screws completely. Remove the solenoid.
5. Pull the rotor off the hub.
6. Watch out for any possible damage, for example eruptions in the friction lining or worn
gearing.
7. Measure the rotor thickness at 3 different positions around the rotor circumference using a
caliper gauge.
8. Compare the measured rotor thickness with the minimum permissible rotor thickness. If the
measured rotor thickness is too low, replace the complete rotor. The values are listed in the
table in Chapter Adjust the air gap (Page 41).
44
WARNING
WARNING
SIMOGEAR Safety-related brake
Operating Instructions, 01/2024, A5E53220852A/RS-AA
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