Functions
8.19 Closed-loop Vdc control
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
8-141
8.19.2 Kinetic buffering
Data
P1240
r0056 bit 15
P1245, r1246, P1247
P1250
Parameter range:
P1256, P1257
Warnings: A0503
Faults: F0003
Function chart number: FP4600
Description
Brief line supply failures can be buffered using the kinetic buffering function (enabled using
P1240). Line supply failures are buffered using the kinetic energy (i.e. moments of inertia) of
the motor load. In this case the prerequisite is that the motor load has a sufficiently high
moment of inertia - i.e. has sufficient kinetic energy.
Using this technique, the frequency is controlled (closed-loop), so that energy is fed to the
inverter from the regenerating motor thus covering the system losses. The losses during the
line supply failure still remain which means that the motor speed decreases. When using
kinetic buffering it has to be taken into consideration that the motor speed is reduced.
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Figure 8-74 Kinetic buffering (Vdc_min controller)
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