Toshiba Tosvert VF-AS1 Instruction Manual page 84

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 a permanent magnet motor
Setting of V/f control mode selection = (PM control)
Permanent magnet motors (PM motors) that are light, small in size and highly efficient, as compared to induction
motors, can be operated in sensorless operation mode. Note that this feature can be used only for specific motors.
For more information, contact your Toshiba distributor.
7) 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 2.
2) Manual setting
Set each motor constant manually.  Refer to 6.22 selection 3.




VF1



0
 
: Area in which the
V/f 5-point cannot
be set
V/f 5-point setting
VF5
VF4
VF3
VF2
  
Voltage
100%
0
 ×
0.4413
E-14
E6581442
Output frequency [Hz]

Base frequency 1

Frequency
used.