System integration 7.4 Braking concepts
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
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
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).
●
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.
1FW6 | 111 |
Configuration Manual, 05/2009, |
