5) setting of v/f characteristic arbitrarily – Toshiba Tosvert VF-AS1 User Manual
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4) Vector control–increasing starting torque and achieving high-precision
operation.
Setting of V/f control mode selection RV=, (Sensorless vector control 1, 2)
Using sensorless vector control with a Toshiba standard motor will provide the highest torque at the lowest speed
ranges. The effects obtained through the use of sensorless vector control are described below.
(1) Provides large starting torque.
(2) Effective when stable operation is required to move smoothly up from the lowest speeds.
(3) Effective in elimination of load fluctuations caused by motor slippage.
(4) Effective in producing high motor torque at low speed.
+
Motor constant must be set.
If the motor you are using is a 4P Toshiba standard motor and if it has the same capacity as the inverter, there is
basically no need to set the motor constant.
Set RV to (sensorless vector control 1) to operate multiple motors of the same type in parallel or to operate a
motor with a two or more notches lower rating.
To perform torque control, set RV to (sensorless vector control 2), which is designed to perform operation
control with higher accuracy. In that case, however, the inverter should be used only for operating a single motor
with an equal or one notch lower rating.
5) Setting of V/f characteristic arbitrarily
Setting of V/f control mode selection RV= (V/f 5-point setting)
In this mode, the base frequency and the base frequency voltage for the V/f control need to be set to operate the
motor while switching a maximum of 5 different V/f characteristics.
[Parameter setting]
Title
Function
Adjustment range
Default setting
H
V/f 5-point setting VF1 frequency
~HJ Hz
H
V/f 5-point setting VF1 voltage
~%
*
H
V/f 5-point setting VF2 frequency
~HJ Hz
H
V/f 5-point setting VF2 voltage
~%
*
H
V/f 5-point setting VF3 frequency
~HJ Hz
H
V/f 5-point setting VF3 voltage
~%
*
H
V/f 5-point setting VF4 frequency
~HJ Hz
H
V/f 5-point setting VF4 voltage
~%
*
H
V/f 5-point setting VF5 frequency
~HJ Hz
H
V/f 5-point setting VF5 voltage
~%
*
*100% adjustment value (200V class: 200V, 400V class: 400V)
Base frequency
voltage 1 XNX
Ou
tpu
t v
o
ltage
[V]/[%]
Output frequency [Hz]
XD
XN
Base frequency 1
0
H
H
H
H
H
H
H
H
H
H
VF1
VF2
VF3
VF4
VF5
V/f 5-point setting
Note:Restrict the amount of torque to boost (XD) to 3% or so. Boosting the torque too much may impair the linearity
between points.