Siemens SINAMICS G120C User Manual

Function description
When the line supply dips or is interrupted, the DC-link voltage in the converter decreases. The
kinetic bu󹪜ering (V
DC min
control) intervenes at an adjustable threshold. The V
DC min
control forces
the load to go into slightly regenerative operation. As a consequence, the converter covers its
power loss and the losses in the motor with the kinetic energy of the load. The load speed
decreases, but the DC-link voltage remains constant during the kinetic bu󹪜ering. After the line
supply returns, the converter immediately resumes normal operation.
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Figure8-74 Principle mode of operation of kinetic bu󹪜ering
Parameter
Parameter Description Factory setting
r0056[0…15] CO/BO: Status word, closed-loop control -
p0210 Device supply voltage 400V
p1240[D] Vdc controller con󹪝guration (vector control) 1
p1245[D] Vdc_min controller switch-in level (kinetic bu󹪜ering) 73%…76%
r1246 Vdc_min controller switch-in level (kinetic bu󹪜ering) - V
p1247[D] Vdc_min controller dynamic factor (kinetic bu󹪜ering) 300%
p1255[D] Vdc_min controller, time threshold 0s
p1257[D] Vdc_min controller, speed threshold 50rpm
Advanced commissioning
8.30Kinetic bu󹪜ering (Vdc min control)
SINAMICS G120C Converters
Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK 351

Siemens SINAMICS G120C Specifications

General

Brand	Siemens
Model	SINAMICS G120C
Category	Inverter
Language	English