Toshiba TOSVERT VF-AS1 Instruction Manual page 87

Base frequency
voltage 1
[V]/[%]
Note 1: Restrict the amount of torque to boost () to 3% or so. Boosting the torque too much may impair the
linearity between points.
Note 2: If the V/f 5-point is set within the diagonally shaded area in the figure below, the V/f 5-point is placed
automatically on the boundary line (heavy line in the figure).
5
6) Operating the motor at periodic speeds by means of a motor speed
sensor
Setting for V/f control mode selection = (PG feedback control)
Set  to  to operate the motor at periodic speeds.
A PG feedback device (optional) is needed. In addition, a motor with a speed sensor (encoder) should be
Use this setting when operating a motor two or more ranks lower in capacity than the inverter at periodic speeds.
Note that the accuracy obtained by = is lower than that obtained by setting  to . Also,  should be set
to  to perform torque control.  cannot be set to  in such a case.
Output torque decreases considerably in regenerative low speed operation (motor slip frequency or less). Set  to
 if regenerative low speed torque is necessary.
Motor constant must be set.
The motor constant can be set in any of the following two ways:
1) Automatic setting
Enter the following information that is indicated on the motor nameplate, and then execute the auto-tuning 1
command (Set  to , and then reset  to .).
<Information indicated on motor nameplate>
 (Base frequency),  (Base frequency voltage),  (Motor rated capacity),  (Motor rated
current), (Motor rated rotational speed) ⇒ Refer to 6.22 selection 1.
2) Manual setting
Set each motor constant manually. ⇒ Refer to 6.22 selection 2.




VF1



0

: Area in which the
V/f 5-point cannot
be set
V/f 5-point setting
VF4
VF3
VF2
   
Voltage
100%
0
 ×
0.4413
E-14
VF5
Output frequency [Hz]

Base frequency 1

Frequency
E6581528
used.