Siemens Sinamics G120P Operating Instructions Manual page 371

Converter cabinet units 110 kw - 400 kw

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Switching Vdc_min control on/off (kinetic buffering)

When Vdc_min control is enabled with p1240 = 2.3 (p1280), it is activated if the power fails

when the Vdc_min switch-in level (r1246 (r1286)) is undershot. In general, the regenerative

power (braking energy) of the drive machine generated when the motor speed is reduced is

used to buffer the DC-link voltage of the drive; in other words, when Vdc_min control is

active, the motor speed no longer follows the main setpoint and can be reduced to zero. The

drive continues operating until the shutdown threshold of the DC-link voltage is undershot

(see "Switching Vdc_min control on/off" <1>).

Parameter specifications in brackets

All parameter specifications in parentheses refer to V/f control.

Inverter cabinet units

Operating Instructions, 12/2014, A5E32923362A

7.6 Protection functions