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Ensuring functional safety
4.8 Service and maintenance
the listed causes of wear to the friction lining occur at the same time in a single application,
the influencing factors should be added together when calculating the wear.
Table 4-2
Component
Friction lining
Armature disk and
flange
Brake rotor gear
teeth
Support of the arma‐
ture disk
Springs
4.8.3
Maintenance intervals for the brake
Replacing rotors
When used in safety-related applications subject to regular torque surges (e.g. caused by
dynamic braking operations), the rotors must always be replaced at the latest after 2 million
cycles or 10 years.
For safe and trouble-free operation, check and maintain the spring-operated brake at regular
intervals.
For operational braking, the maintenance intervals depend on the load on the brake in the
specific application. Take all causes of wear into account when calculating the maintenance
intervals. Siemens AG recommends a regular inspection at fixed time intervals for brakes that
are subject to low loads, e.g. holding brakes with an emergency stop.
38
Causes of wear for spring-operated brakes
Cause
Emergency stops
Wear caused by overlap
when starting and stopping
the geared motor
Active braking by the motor
supported by the brake
(quick stop)
Low speed and mounting
position 'motor at top'
Wear when starting for mo‐
tor a mounting position with
vertical shaft, even when
the brake is open
The brake lining is rubbing/
chafing
Relative movement and
shock between the rotor and
hub
Load change and impacts in
the backlash between the ar‐
mature disk, sleeve screws
and guide pins
Axial load cycle and shear
stresses in the springs due to
radial backlash in the arma‐
ture disk
WARNING
Effect
Friction lining wear
Run-in of armature disk
and flange
Wear of the teeth (pri‐
marily on the rotor side)
Deflection of armature
disk, sleeve screws and
pins
Decrease in the spring
force or fatigue failure
SIMOGEAR Safety-related brake
Operating Instructions, 01/2024, A5E53220852A/RS-AA
Influencing factor
Work as a result of the
frictional force
Number of start / stop
cycles
Work as a result of the
frictional force
Number of start / stop
cycles
Number of start / stop
cycles, strength of brak‐
ing torque
Number of switching op‐
erations of the brake
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