Siemens SINAMICS G110M - Page 314

Requirement
The DC braking function is possible only for induction motors.
NOTICE
Motor overheating as a result of DC braking
The motor will overheat if you use DC braking too frequently or use it for too long. This may
damage the motor.
• Monitor the motor temperature.
• Allow the motor to adequately cool down between braking operations.
• If necessary, select another motor braking method.
Function description
With DC braking, a constant braking current 󹪞ows through the motor. As long as the motor is
rotating, the DC current generates a braking torque.
The following con󹪝gurations are available for DC braking:
• DC braking initiated by a control command
• DC braking when falling below a starting speed
• DC braking when the motor is switched o󹪜
Regardless of the con󹪝guration, you also can de󹪝ne the DC braking as a reaction to certain
converter faults.
WARNING
Unexpected motor acceleration
In the following con󹪝gurations, the converter can accelerate the motor to the set speed
without requiring a further ON command:
- DC braking initiated by a control command
- DC braking when falling below a starting speed
An unexpected acceleration of the motor can cause serious injury or material damage.
• Consider the behavior of the drive in the higher-level controller.
Advanced commissioning
8.20 Electrically braking the motor
Distributed converter for SIMOGEAR geared motors
312 Operating Instructions, 10/2020, FW V4.7 SP13, A5E31298649B AL