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Engineering Guide CDA3000
3 Selection of inverter module
3.3.8 Design of the
braking resistor
In regenerative operation, e.g. braking the drive, the motor feeds energy
back into the inverter. This increases the voltage in the DC link. If the volt-
age exceeds a permissible value, the internal braking transistor is acti-
vated and the regenerative energy is converted into heat by way of the
externally connected braking resistor.
Figure 3.40
Block diagram of an inverter with braking chopper
Asynchronous
motor
External
braking resistor