Adapting The Vmin Boost - Lenze 8400 StateLine C Reference Manual

8400 StateLine C | Reference manual
Motor control (MCTRL)
V/f characteristic control (VFCplus)
5.4.3.2

Adapting the Vmin boost

The V boost (C00016) of the motor voltage serves to select a load independent
min
magnetising current which is required for asynchronous motors. The torque behaviour of
the motor can be optimised by adapting the setting in C00016.

Note!
The V
frequency (C00015).
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.
V [V]
out
V
rmot
(100 %)
C00016
C00016
2
[5-5] Representation of the linear V/f characteristic (on the left) and quadratic V/f characteristic (on the right)

How to set the V
1. Operate motor in idle state at approx. 6 % of the rated motor speed.
2. Increase V
Motor in short-time operation up to 0.5 n
• for self-ventilated motors: I
• for forced ventilated motors: I
Motor in continuous operation up to 0.5 n
• for self-ventilated motors: I
• for forced ventilated motors: I
134
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boost has an effect on output frequencies below the V/f base
min
1/N/PE AC 264 V
3/PE AC 264 V
3/PE AC 550 V
1/N/PE AC 180 V
3/PE AC 100 V
3/PE AC 320 V
C00015 C00015
f [Hz]
2
boost:
min
boost (C00016) until the following motor current is reached:
min
L
V [V]
out
V
rmot
(100 %)
C00016
rated
≈
I
motor rated motor
≈
I
motor rated motor
rated
≈
0.8 I
motor rated motor
≈
I
motor rated motor
Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
1/N/PE AC 264 V
3/PE AC 264 V
3/PE AC 550 V
1/N/PE AC 180 V
3/PE AC 100 V
3/PE AC 320 V
C00015
f [Hz]