Lenze L-force HighLine C 8400 Series Reference Manual page 241

Field feedforward control
To have enough voltage reserve available for dynamic acceleration processes, a timely
weakening of the field is required. The field weakening is controlled by the field
feedforward control.
Parameter
C00576
The field feedforward control reciprocally reduces the magnetising current from the V/f
base frequency (C00015) on. The starting point of the reduction can be shifted to low
frequencies via the field feedforward control (C00576). Thus, more voltage reserve is
available for acceleration processes.
The field feedforward control (C00576) must be specified in %, based on the rated slip of
the machine.

Tip!
Generally, the Lenze setting is sufficient for most applications.
• We recommend to increase the field feedforward control for applications with
very dynamic acceleration processes in the field weakening range.
• Reduce the field feedforward control for very slow applications if necessary.
Adaptive adaptation of the P component of the field and speed controllers
In the field weakening range, the properties of the drive change due to the reduction of the
magnetisation and the voltage limitation of the inverter. To be able to continue to provide
a stable, well dampened drive behaviour, the servo control has an automatic adaptation of
the P component of the field weakening controller and speed controller.
In the Lenze setting, this function is activated. Depending on the application, this function
can be deactivated via C00079/2.
Parameter
C00079/2

Tip!
Lenze recommends to always activate the adaptation of the field weakening and
speed controller.
Firmware ≤ 11.00 - DMS 6.0 EN - 10/2011
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Info
SC: Field feedforward control
Info
SC: Adaptive field weakening controller
L
8400 HighLine C | Reference manual
Motor control (MCTRL)
Servo control (SC)
Lenze setting
Value Unit
200.0 %
Lenze setting
1: On
241