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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 52. Product description2.1 Operating principleThe spring-applied single-disc brake is designed to operate dry. The force generated by an electromagneticfield is utilised to overcome the braking effect produced by the spring force.The spring-applied single-disc brake engages in unpowered condition and releases when AC voltage isapplied. The form-fit connection between the friction disc and hub and the connection of the hub with themachine shaft (e.g. motor shaft) ensure that the torque generated by the spring-applied single-disc brake(brake torque) is reliably transmitted to the machine (motor). Spring-applied single-disc brakes with firedampprotection are characterised by the fact that all components that may ignite explosive mixtures are placed inan enclosure. This enclosure is designed to withstand the specified test pressure in case the mixtureexplodes inside the enclosure. It also ensures that mixtures outside the enclosure are not affected by theexplosion. To ensure reliable firedamp protection, the cable entry of the spring-applied single-disc brake isequipped with a special threaded entry sleeve.2.2 StructureThe solenoid housing (1.1) of the spring-applied single-disc brake accommodates the firmly fitted field coil(1.2) with flying leads. The flying leads are connected to the connecting terminal (19) inside the connectorbox (25). The flange (3) and friction plate (33) are screwed to the solenoid housing (1.1) by means ofmachine screws (22). The cover (7) is fixed to the solenoid housing (1.1) by means of machine screws (20)to obtain a pressure-sealed assembly. Owing to the spring force generated by the compression springs (4and 35), the friction disc (5) is pressed over the armature (2) against the friction plate (33) and flange (3) togenerate the braking effect of the spring-applied brake. The friction disc (5) and hub (17), which constitutethe rotating part of the spring-applied brake, are connected with the shaft to be braked. The friction disc (5)features a square socket and can be moved on the hub (17) in axial direction. Spacer sleeves (6) areprovided to allow the air gap 's' to be adjusted. The customer-specific connecting cable can be fed into theconnector box (25) through a cable entry sleeve (30). When AC voltage is applied to the built-in bridgerectifier of the spring-applied single-disc brake, the spring force is overcome by the dynamic effect of theelectromagnetic field. This causes the armature (2) to be released and the braking effect to be neutralised.The shaft to be braked is not exposed to any axial force by the brake. The spring-applied single-disc brake isequipped with a redundant thermoswitch system (2x2 thermoswitches) (11 and 12) and with a microswitch(13) 1) . The microswitch (13) is provided to prevent machine (e.g. motor) start-up before the brake has beenreleased. The four (2x2) thermoswitches (11 and 12) are connected in series with the microswitch (13) andinterrupt the control circuit of the machine (e.g. motor) as soon as the maximum permitted brake temperatureis exceeded. When using brakes with hand release (29), openings must be provided in the part enclosing thebrake (e.g. fan cover) to allow the hand release lever to be installed. The hand release (29) 2) allows thebrake to be released manually (e.g. in case of power failure).1) brake types with microswitch2) brake types with hand releaseKey to figures:1.1 Solenoid housing 13.3 Angle 25 Connector box1.2 Field coil 13.4 Countersunk screw 26 Cover2 Armature 13.5 Plate 27 Machine screw3 Flange 13.6 Machine screw 28 Spring washer4 Compression spring 13.7 Connecting cable (microswitch) 29 Hand release5 Friction disc 14 Circlip (outer ring) 29.1 Cam6 Spacer sleeve 15 Circlip (inner ring) 30 Cable entry sleeve assembly7 Cover 16 O-ring 30.1 Threaded cable entry sleeve8 Fixing surface 17 Hub 30.2 Sealing ring9 Flat seal 18 Deep groove ball bearing 30.3 Machine screw10 Fixing screw 19 Connecting terminal 30.4 Clamping strap11 Thermoswitch (2 switches) 20 Machine screw 31 Locknut12 Thermoswitch (2 switches) 21 Spring washer 32 Machine screw13 Microswitch 22 Machine screw 33 Friction plate13.1 Locknut 23 Spring washer 34 Rating plate13.2 Set screw 24 O-ring 35 Compression spring36 Duct |
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