Siemens Outboard Motor S120 Manual Do Utilizador
System integration
7.4 Braking concepts
1FW6 Built-in torque motors
Configuration Manual, 05/2009, 6SN1197-0AE00-0BP3
Configuration Manual, 05/2009, 6SN1197-0AE00-0BP3
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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.
Drawback:
Depending on the speed, the relatively long response time of the brake
controller may mean that the rotating mass continues to rotate for a while 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.
A list of recommended braking element manufacturers is provided in the appendix.
Deploying a holding brake
Due to cogging torques, torque motors can be pulled into a preferable magnetic operating
position if the motor is no longer supplied with power from the drive. If the drive is already at
a standstill, this can cause unexpected movements in up to a half magnetic pole pitch in both
directions. To prevent any damage to the workpiece and/or tool, it may be advisable to use a
holding brake.
Due to the lack of a mechanical self-locking system, a holding brake should be installed for
Due to the lack of a mechanical self-locking system, a holding brake should be installed for
inclined or horizontal drives without weight compensation so that the drive can be shut down
and de-energized in any position.
WARNING
For inclined and horizontal axes, the load may be reduced in an uncontrolled manner if the
center of gravity is outside the rotary axes when the system is disconnected from the power
supply.
A holding brake may also be required if:
● The bearing friction does not compensate or exceed the cogging torques and unexpected
movements result.
● Unexpected movements of the drive can lead to damage (e.g. a motor with a large mass
also generates strong kinetic energy).
● Weight-loaded drives must be shut down and de-energized in any position.
To prevent movements when the drive is switched on or off, the holding brake response
To prevent movements when the drive is switched on or off, the holding brake response
must be synchronized with the drive.
During commissioning, refer to the documentation for the drive system being used.
During commissioning, refer to the documentation for the drive system being used.