8400 StateLine C | Reference manual
Motor control (MCTRL)
V/f characteristic control (VFCplus)
134
L
Firmware
≤
11.00 - DMS 8.0 EN - 10/2011
5.4.3.2
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.
[5-5]
Representation of the linear V/f characteristic (on the left) and quadratic V/f characteristic (on the right)
How to set the V
min
boost:
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
rated
• for self-ventilated motors: I
motor
≈
I
rated motor
• for forced ventilated motors: I
motor
≈
I
rated motor
Motor in continuous operation up to 0.5 n
rated
• for self-ventilated motors: I
motor
≈
0.8 I
rated motor
• for forced ventilated motors: I
motor
≈
I
rated 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 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
C00016
V
[V]
out
f [Hz]
V
(100 %)
rmot
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
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
