Lenze E84DSxxx - Manual (Page 119)

Lenze · 8400 protec StateLine · Reference manual · DMS 4.2 EN · 03/2013 · TD05
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5 Motor control (MCTRL)
5.4 V/f characteristic control (VFCplus)
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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 ( 120)
 Adapting the Vmin boost ( 121)
Freely defining the characteristic
The V/f characteristic can also be defined freely if the linear and quadratic characteristics are not
suitable.
 Defining a user-defined V/f characteristic ( 126)
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 ( 122)
• 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 ( 133)