Lenze 8400 StateLine - Manual (Page 132)

5 Motor control (MCTRL)
5.4 V/f characteristic control (VFCplus)
132
Lenze · 8400 StateLine · Reference manual · DMS 12.0 EN · 06/2014 · TD05/TD14
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5.4.3 Optimising the control mode
The V/f characteristic control (VFCplus) is generally ready for operation. It can be adapted
subsequently 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
profiles or motors by adapting the V/f base frequency ( C00015 ) and the V
min
boost ( C00016 ).
 Adapting the V/f base frequency ( 133)
 Adapting the Vmin boost ( 135)
Freely defining the characteristic
From version 04.00.00 onwards , the V/f characteristic can also be defined freely if the linear and
square-law characteristic are not suitable.
 Defining a user-defined V/f characteristic ( 140)
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 ( 136)
• Adaptation of the field frequency by a load-dependent slip compensation (improved speed
accuracy for systems without feedback)
• Adaptation of the controller parameters of the slip regulator if V/f control (VFCplus + encoder)
is selected.  Parameterising the slip regulator ( 158)

Note!
Following successful motor parameter identification, the V/f base frequency ( C00015 )
and the V
min
boost ( C00016 ) as well as the slip constant for slip compensation ( C00021 )
are calculated automatically.
From version 12.00.00:
• Following successful motor parameter identification, the gain of the Imax controller
( C00073/1 ) is calculated automatically.
• If these parameters are not to be calculated, bit 4 of C02865/1 must be set to "1".
• Following successful motor parameter identification, other controller parameters
( C00011 , C00022 , C00966 ) can be calculated automatically.
• If these parameters are to be calculated, bit 6 of C02865/1 must be set to "6".