Maintenance/repair
Maintenance operations
Spring−operated brakes
8
41
Lenze ¯ BA 33.0005 ¯ 5.0
8.2.3 Spring−operated brakes
To ensure safe and trouble−free operation, spring−applied brakes must be checked and
maintained at regular intervals. Servicing can be made easier if good accessibility of the
brakes is provided in the plant. This must be considered when installing the drives in the
plant.
Primarily, the necessary maintenance intervals for industrial brakes result from the load
during operation. When calculating the maintenance interval, all causes for wear must
be taken into account, (( 42). For brakes with low loads such as holding brakes with
emergency stop, we recommend a regular inspection at a fixed time interval. To reduce
the cost, the inspection can be carried out along with other regular maintenance work
in the plant if necessary.
If the brakes are not maintained, failures, production losses or damage to the system
may occur. Therefore, a maintenance concept adapted to the particular operating
conditions and brake loads must be defined for every application. For the spring−applied
brakes, the maintenance intervals and maintenance operations listed in the below
table must be provided. The maintenance operations must be carried out as described
in the detailed descriptions.
Type Service brake Holding brake with emergency stop
Spring−applied brake ¯ according to service life
calculation
¯ otherwise every six months
¯ after 4,000 operating hours at the
latest
¯ at least every two years
¯ after 1 million cycles at the latest
¯ provide shorter intervals in the
case of frequent emergency stops
8.3 Maintenance operations
8.3.1 Motor
Stop!
¯ Make sure that no foreign bodies can enter the inside of the motor!
¯ Do not remove plugs when voltage is being applied!
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.
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.
To Next Page
Loading...
Need help?
General
