Lenze MDFQA Operating Instructions - Manual (Page 25)

Mechanical installation
Holding brake (option)
Permanent magnet holding brakes
5
EN
25 Lenze ¯ BA 33.0006 ¯ 3.0
Wear of permanent magnet brakes
If applied as directed (application as holding brakes), the permanent magnet brakes of
the servo motors are wear free and intended for long operating times. The wear on the
friction lining is due to e.g. emergency stops.
The table below describes the different reasons for wear and their impact on the
components of the permanent magnet brakes.
Component Effects Influencing factors Cause
Friction lining /
friction surface at
the armature plate
and external pole Wear on the friction lining Applied friction energy Braking during operation
(impermissible, holding
brakes!)
Emergency stops
Overlapping wear when
the drive starts and stops
Active braking by the drive
motor with the help of the
brake (quick stop)
Springs Fatigue failure of the
springs Number of switching
operations of the brake Axial duty cycle of the
springs
Permanent magnet Useless brake Temperature, overvoltage Excessive overvoltages /
temperatures
(
Stop!
In case of wear above the maximum air gap ( , brake operating
instructions), application of the brake cannot be ensured. In this case, no
braking process is carried out.