Siemens SINAMICS S120 Function Manual page 240

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Vector control

6.9 Vdc control

Vdc_min control

In the event of a power failure, V

This controls the DC link voltage and maintains it at a constant level. The motor speed is

When the power supply is restored, the DC link voltage increases again and V

deactivated again at 5% above the V

If the power supply is not re-established, the motor speed continues to drop. When the

threshold in p1257 is reached, this results in a response in accordance with p1256.

Once the time threshold (p1255) has elapsed without the line voltage being re-established, a

fault is triggered (F07406), which can be parameterized as required (factory setting: OFF3).

DC link, by transferring to them a scaling of their speed setpoint from the controlling drive via

BICO interconnection.

If it is expected that the line supply will return, you must make sure that the drive lineup is not

disconnected from the line supply. It could become disconnected, for example, if the line

contactor drops out. The line contactor must be supplied, e.g. from an uninterruptible power

supply (UPS).

control on/off (kinetic buffering)

controller can be activated for a drive. Other drives can participate in supporting the

is activated when the V

switch-on level. The motor continues operating

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

switch-on level is undershot.

Drive functions