Functions
6.9 Technological functions
SINAMICS G110D
Operating Instructions, 07/2016, FW V3.63, A5E36768472B AB
135
Dynamic braking
Dynamic braking applications
Dynamic braking is typically used in applications in which dynamic motor behavior is
required at different speeds or continuous direction changes, e.g. for conveyor drives or
hoisting gear.
An internal chopper control (braking chopper) in the inverter, which can control an external
braking resistor, is required for dynamic braking.
Operating characteristics of dynamic braking
Dynamic braking converts the regenerative energy, which is released when the motor
brakes, into heat.
Image 6-11 Braking chopper in the Inverter
The inverter controls the dynamic braking depending on the DC link voltage.
The temperature monitoring of the braking resistor should be evaluated. The inverter must
be switched off if the braking resistor overheats.
If a braking resistor that is unsuitable is used, a fire could break out and severely damage
the inverter.
The temperature of braking resistors increases during operation. For this reason, avoid
coming into direct contact with braking resistors. Make sure that the devices are located at
sufficient distances from each other and that proper ventilation is provided.
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