4.4.22.1.2.2 Regenerative operation
In regenerative operation, a mains power failure will have no effect.
Figure 21: Regenerative operation in case of mains power failure
4.4.22.1.3 Behavior in case of mains power failure with activated power-off function
4.4.22.1.3.1 Control to constant DC link voltage
If a mains power failure is detected, the power flow to the motor is interrupted and
the motor is brought into regenerative operation. The power fed back into the DC
link is controlled in such a way that the DC link voltage is kept at the selected set-
point. By way, external loads connected to the DC bus can be supplied with con-
stant voltage. If the power fed back by the motor is not sufficient to cover the power
requirements of the external loads, the DC link voltage will drop and switch off the
CDM with undervoltage error.
Figure 22: Control to constant DC link voltage
The deceleration of the motor results from the energy stored in the rotating masses
of the motor and the power requirement of the external DC loads.
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