Lenze 8400 HighLine C Series - 5.4.2.2 Adapting the Vmin boost

Firmware ≤ 05.00 - DMS 4.2 EN - 02/2010 L 119
8400 HighLine | Parameter setting & configuration
Motor control (MCTRL)
V/f characteristic control (VFCplus)
5.4.2.2 Adapting the Vmin boost
The V
min
boost (C00016) of the motor voltage serves to select a load independent
magnetising current which is required for asynchronous motors. The torque behaviour of
the motor can be optimised by adapting the setting in C00016
.
The general linear and quadratic V/f characteristics are shown in the illustrations below.
The illustrations show the impacts of the parameters used to adapt the characteristic
shape.
[5-6] Representation of the linear V/f characteristic (on the left) and quadratic V/f characteristic (on the right)
 To set the V
min
boost, proceed as follows:
1. Operate motor in idle state at approx. 6 % of the rated motor speed.
2. Increase V
min
boost (C00016) until the following motor current is reached:
Motor in short-time operation up to 0.5 n
N
• for self-ventilated motors: I
Motor
≈ I
N Motor
• for forced ventilated motors: I
Motor
≈ I
N Motor
Motor in continuous operation up to 0.5 n
N
• for self-ventilated motors: I
Motor
≈ 0.8 I
N Motor
• for forced ventilated motors: I
Motor
≈ I
N Motor
 Note!
The V
min
boost has an effect on output frequencies below the V/f base
frequency (C00015
).
C00015
C00016
C00015
2
C00016
2
V[V]
out
f [Hz]
V
(100 %)
rmot
1/N/PE AC 264V
3/PE AC 264V
3/PE AC 550V
1/N/PE AC 180V
3/PE AC 100 V
3/PE AC 320 V
C00015
C00016
V[V]
out
f [Hz]
V
(100 %)
rmot
1/N/PE AC 264V
3/PE AC 264V
3/PE AC 550V
1/N/PE AC 180V
3/PE AC 100 V
3/PE AC 320 V
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