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Kendrion 76..P..B00 Series Operating Instructions Manual
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Kendrion Binder Magnete GmbH Operating Instructions 76 ..P..B00 Last updated: 30 Dec. 2009 Page 184. Maintenance4.1 Checks and serviceThe 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 smax )and that the safety switches (microswitch (13) 1) and thermoswitches (11 and 12)) must be checked atregular intervals. These maintenance measures must be performed during the general inspection of theelectric machine (e.g. motor). Make sure that the spring-applied brake is unpowered and that the explosionprotection is not interfered with when carrying out maintenance work. When opening the flameproof enclosedsolenoid housing (1.1) to allow the friction disc (5) to be replaced, for example, the safety informationprovided in this manual must be strictly observed. Always check that the flameproof gaps are in perfectcondition. Do not use spare parts other than original spares supplied by the manufacturer of the spring-applied brake.1) brake types with microswitchWarning!In case the explosion protection features of the spring-applied brake are damaged during maintenance orrepair work, the brake must be checked by an authorised expert. Any measures required to restore explosionprotection 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 theconnecting terminal (19). Unscrew the machine screw (30.3) of the cable entry sleeve (30) and remove theconnecting cables from the connector box (25). Loosen the fixing screws (10). Remove the brake from theshaft 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 measuringbridge with dial gauge on the flange (3) to measure the air gap 's'. Position the measuring tip of themicrometer screw on the friction disc (5).Release the spring-applied brake so that the air gap 's' can be determined from the difference between thevalues 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. Forinformation 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) providedon the flange (3) and remove the flange (3). Remove the friction disc (5) from the hub (17) and replace it by anew one.Attention!Make sure that the connections of the four thermoswitches (11 and 12) are not damaged or loosened whenremoving the flange (3). |
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