Motor components and options
4.1 Motor components
1FW6 Built-in torque motors
Configuration Manual, 07/2017, 6SN1197-0AE00-0BP9
89
Braking and emergency stop concepts
In the case of rotating axes that are restricted to a rotation angle of < 360°, damping and
impact absorption elements at the limits of the rotation range offer reliable protection.
To dissipate the kinetic energy of the rotating mass before it comes into contact with the
damping elements, the following measures should be taken to support mechanical braking
systems:
1. Electrical braking using the energy in the DC link:
Please refer to the documentation of the drive system being used!
2. Electrical braking using armature short-circuit of the stator:
Please refer to the documentation of the drive system being used!
Disadvantage:
The braking torque depends on the speed and may not be sufficient to
bring the rotating masses to a standstill.
-circuit braking is used, special contactors are required because the
currents can be very high.
– The release timing for the drive system must be taken into
3. Mechanical braking via braking elements:
The braking capacity must be dimensioned as highly as possible so that the rotating
masses can be reliably braked at maximum kinetic energy.
Disadvantage:
Depending on the speed, the relatively long response time of the brake
controller may mean that the rotating mass continues to rotate for some time without
being braked.
We recommend that all three measures be implemented together. Measures (2) and (3) are
used as an additional protection here in case measure (1) fails: The short-circuiting of the
stator works at high speeds to begin with and then the mechanical brake takes effect at
lower speeds.
A list of recommended braking element manufacturers is provided in the appendix.
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