Lenze 8400 User Manual

Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23 163
5 Motor control (MCTRL)
5.4 V/f characteristic control (VFCplus)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
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
( 164)
Adapting the Vmin boost
( 166)
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
( 171)
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 ( 167)
• 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
( 189)
 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".

Lenze 8400 Specifications

General

Category	DC Drives
Series	8400
Protection class	IP20
Control Type	Vector control
Communication	CANopen, PROFIBUS, Ethernet
Protection Features	Overcurrent, overvoltage, undervoltage, overtemperature
Input Voltage	AC 230/400/480 V