Figure 21: Regenerative Operation In Case Of Mains Power Failure; Figure 22: Control To Constant Dc Link Voltage - KEB COMBIVERT F6 Programming Manual

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Protection functions

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.

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.

Combivert s6