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14.10.4.3
Vdc_min controller (Vdc_min control)
Overview
The Vdc_min controller (kinetic buffering) increases the drive availability because the kinetic
energy of the load accommodates brief power dips or failures.
Requirement
Requirements:
• The driven load has a sufficiently high inertia.
• The application allows braking of the motor during a power failure.
Description of function
When the power dips or fails, the DC link voltage in the converter decreases. The Vdc_min
controller intervenes starting from an adjustable threshold. With kinetic buffering active, the
converter covers its power loss and the losses in the motor with the kinetic energy of the load.
The speed of the load decreases but the DC link voltage remains constant with the Vdc_min
controller active. After the line supply returns, the converter resumes normal operation.
The Vdc_min controller can typically accommodate power failures of up to 1 second.
Figure 14-109
Parameters
The following list contains the parameters of the "Vdc_min controller" function for U/f control.
Number
r0056.0...15
p0210
p1280[0...n]
SINAMICS G220 converter
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB
Principal mode of operation of the Vdc_min controller
Name
Status word, closed-loop control
Device supply voltage
Vdc controller or Vdc monitoring configuration (U/f)
Functions
14.10 Closed-loop drive control
Unit
[V]
499
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