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Advanced commissioning
6.9 Drive availability
6.9.3
Kinetic buffering (Vdc min control)
Overview
Kinetic buffering increases the drive availability. The kinetic buffering utilizes the kinetic energy
of the load to buffer line dips and failures. During a line dip, the converter keeps the motor in the
switched-on state for as long as possible. One second is a typical maximum buffer time.
Precondition
The following conditions have to be fulfilled to use the "kinetic buffering" function
advantageously:
● The driven machine has a sufficiently high inertia.
● The application allows a motor to be braked during a power failure.
Function description
When the line supply dips, the DC-link voltage in the converter decreases. The kinetic buffering
(V
DC min
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 buffering. After the line supply returns, the
converter immediately resumes normal operation.
Figure 6-90
Parameters
Number
r0056[0...15]
p0210
p1240[D]
428
control) intervenes at an adjustable threshold. The V
Principle mode of operation of kinetic buffering
Name
CO/BO: Status word, closed-loop control
Device supply voltage
Vdc controller configuration (vector control)
control forces the load to go
DC min
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC
Factory setting
-
400 V
1
SINAMICS G120X converter
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