Lenze MDxMA-MHxMA-MFxMA-MDERA-MHERA Three-phase AC motors - Manual (Page 45)

Maintenance/repair
Maintenance intervals
Spring−operated brakes
8
l
45 BA 33.0005−EN 2.0
8.2.2 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, ((
¶ 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.
(
Stop!
Stable properties of the organic friction lining are only achieved in the case of
continuous use. The readiness for operation of the brake has to be ensured
with a braking energy that is equivalent to one emergency stop per week.
Unplanned emergency stops occurring at a sufficient frequency have the same
effect.
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.
Versions Service brakes Holding brakes with emergency
stop
INTORQ BFK458− LL E / N l according to service life
calculation
l otherwise every six months
l after 4,000 operating hours at
the latest
l at least every two years
l after 1 million cycles at the
latest
l provide shorter intervals in the
case of frequent emergency
stops
INTORQ BFK458− LL L l at least every two years
l after 10 million cycles at the
latest
l provide shorter intervals in the
case of frequent emergency
stops