Lenze L-force HighLine C 8400 Series Reference Manual page 240

8400 HighLine C | Reference manual
Motor control (MCTRL)
Servo control (SC)
Field weakening controller
The field weakening controller serves to adapt the magnetising current when the
maximum control voltage has been reached so that in steady operation approximately
95 % of the maximally possible control voltage is output. Thus, there is a voltage reserve
for dynamic load or speed variations.
Parameter
C00577
C00578
V : Gain of the field weakening controller (C00577)
P,FW
L : Mutual motor inductance (C00092)
m
L : Motor stator leakage inductance (C00085)
sl
p = number of pole pairs
[5-19] Recommendation for setting the gain of the field controller (for Tn ≈ 10 ... 30 ms)

Tip!
If the field weakening controller is parameterised unfavourably, vibrations occur in
the magnetising current, in the direct-axis current and in the cross current, in the
torque and in the speed in the field weakening range. This is also audible by an
increased motor noise (humming). The vibrations can be dampened by a decrease
of the proportional gain of the field weakening controller.
Procedure:
• Operate the drive with max. required speed in the field weakening operation.
• Reduce Vp (C00577) of the field weakening controller until the vibration
response cannot be detected anymore.
240
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Info
SC: Vp field weakening controller
SC: Tn field weakening controller
V
P, FS
p 2 π n
1 σ
–
V ⋅ ----------------------------- - σ
------------
=
Path, FS
σ
σ 1
=
L
2
≈
------------------- -
V
Path, FS
⋅ ⋅ ⋅
2
N
⋅ ⋅ ( L L )
+
h ss
60
2
( L )
h
– ------------------------- -
2
( L L )
+
h ss
Firmware ≤ 11.00 - DMS 6.0 EN - 10/2011
Lenze setting
Value Unit
0.0010
20.0 ms