Maintenance/repair7
j | BA 14.0168 | 10/2013
48
7.2 Inspections
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, ( 47). 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 t o 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.
7.2.1 Maintenance intervals
Designs Service brake Holding brake with emergency stop
BFK458- E/N
BFK458- L
| according to service life
calculation
| otherwise every six months
| after 4000 operating hours at
the latest
| at least every 2 years
| after 1 million cycles at the
latest
| provide shorter intervals with
frequent emergency stops
7.3 Maintenance
Note!
Brakes with defective armature plates, springs or flanges must completely be
replaced.
In general, the following must be observed when carrying out any inspection or
maintenance work:
| Remove impurities through oil a nd grease 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 the replacement of the rotor, the initial braking torque will not be
reached until the friction surfaces are run in. After the replacement of the
rotor, the run-in armature plates and flanges have a higher initial rate of wear.
In this case, the air gap must be adjusted betimes if necessary.