Spring−Operated Brakes - Lenze m500-P Series Operating Instructions Manual

8.3.2 Spring−operated brakes
The brake is mounted to the N−end shield of the motor. Remove the fan cover or blower
unit or the encoder, if available, to check, maintain, or set the brake.
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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.
Wear on spring−applied brakes
The used spring−applied brakes have a low rate of wear and are designed for long
maintenance intervals.
However, the friction lining, the teeth between the brake rotor and the hub, and also the
braking mechanism are naturally subject to function−related wear which depends on
the application case (see table). In order to ensure safe and problem−free operation, the
brake must therefore be checked and maintained regularly and, if necessary, replaced
(see brake maintenance and inspection).
The following table describes the different causes of wear and their effect on the
components of the spring−applied brake. In order to calculate the useful life of the rotor
and brake and determine the maintenance intervals to be prescribed, the relevant
influencing factors must be quantified. The most important factors are the applied
friction energy, the starting speed of braking and the switching frequency. If several of
the indicated causes of wear on the friction lining occur in an application, their effects
are to be added together.
Lenze ¯ BA 33.0008 ¯ 5.0
Maintenance/repair
Maintenance operations
Spring−operated brakes
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