Maintenance; Checks And Service - Kendrion 76..P..B00 Series Operating Instructions Manual

4. Maintenance

4.1 Checks and service

The spring-applied single-disc brake does not require any particular maintenance except that the friction disc
(5) must be replaced when worn (see "Technical specifications" for information on the maximum air gap s
and that the safety switches (microswitch (13)
regular intervals. These maintenance measures must be performed during the general inspection of the
electric machine (e.g. motor). Make sure that the spring-applied brake is unpowered and that the explosion
protection is not interfered with when carrying out maintenance work. When opening the flameproof enclosed
solenoid housing (1.1) to allow the friction disc (5) to be replaced, for example, the safety information
provided in this manual must be strictly observed. Always check that the flameproof gaps are in perfect
condition. Do not use spare parts other than original spares supplied by the manufacturer of the spring-
applied brake.
1)
brake types with microswitch
Warning!
In case the explosion protection features of the spring-applied brake are damaged during maintenance or
repair work, the brake must be checked by an authorised expert. Any measures required to restore explosion
protection must be performed by the manufacturer or by authorised repair shops (see Section 12).
Brake removal from the machine (e.g. motor):
Loosen the machine screws (27) provided on the cover (26) of the connector box (25) and remove the cover
(26). Disconnect the strands of the connecting cables (field coil (1.2) and safety switches) from the
connecting terminal (19). Unscrew the machine screw (30.3) of the cable entry sleeve (30) and remove the
connecting cables from the connector box (25). Loosen the fixing screws (10). Remove the brake from the
shaft with the two pull-off threads provided on the solenoid housing (1.1) and by means of machine screws
(e.g. in accordance with ISO 4762).
Checking the air gap 's':
Loosen the machine screws (20) provided on the cover (7) and remove the cover (7). Place a measuring
bridge with dial gauge on the flange (3) to measure the air gap 's'. Position the measuring tip of the
micrometer screw on the friction disc (5).
Release the spring-applied brake so that the air gap 's' can be determined from the difference between the
values indicated by the dial gauge.
Attention!
Temporary electric release of the spring-applied brake is required to allow the air gap 's' to be measured. For
information on the electrical connection of the brake to the power source, please refer to Section 3.3.
Friction disc (5) replacement:
Remove the self-locking nut (31) from the machine screws (32). Loosen the machine screws (22) provided
on the flange (3) and remove the flange (3). Remove the friction disc (5) from the hub (17) and replace it by a
new one.
Attention!
Make sure that the connections of the four thermoswitches (11 and 12) are not damaged or loosened when
removing the flange (3).
Kendrion Binder Magnete GmbH
1)
and thermoswitches (11 and 12)) must be checked at
Operating Instructions 76 ..P..B00 Last updated: 30 Dec. 2009
)
max
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