4.4.22.1.1.2 Regenerative operation
In regenerative operation, mechanical energy of the motor is converted into electri-
cal energy in the DC link. A power flow back into the mains is not possible via the
rectifier. Therefore, the voltage in the DC link increases and on exceeding the trip-
ping voltage, the energy in the braking resistor is converted into heat. If no braking
resistor is connected, the CDM switches off with overvoltage error.
Figure 19: Regenerative operation
4.4.22.1.2 Behavior in case of mains power failure without activated power-off function
4.4.22.1.2.1 Motor operation
If the mains fails during motor operation, energy is still taken from the DC link.
Since the DC link is no longer recharged from the mains, the DC link voltage drops.
If the undervoltage limit is undercut, the CDM switches off with undervoltage error.
The connected motor coasts down.
Figure 20: Motor operation without power-off function
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