User guide

5 Motor control (MCTRL)
5.4 V/f characteristic control (VFCplus)
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Lenze · 8400 BaseLine C · Reference manual · DMS 1.6 EN · 01/2014 · TD05
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5.4.3 Optimise control behaviour
The V/f characteristic control (VFCplus) is generally ready for operation. It can be adapted subse-
quently by adapting the characteristic and/or the drive behaviour.
Adapting characteristic
For the linear and quadratic characteristic, it is also possible to match its curve to different load pro-
files or motors by adapting the V/f base frequency (C015
) and the V
min
-boost (C016) .
Adapting the V/f base frequency
( 83)
Adapting the Vmin boost
( 84)
Adapting drive behaviour
• Limitation of the maximum current by a current limitation controller (e.g. to prevent the motor
from stalling or to limit to the maximally permissible motor current).
Optimising the Imax
controller ( 85)
• Adaptation of the field frequency by a load-dependent slip compensation (improved speed ac-
curacy for systems without feedback)