Toshiba Tosvert VF-S15 Instruction Manual page 132

1) Constant torque characteristics
Setting of V/F control mode selection  to  (V/F constant)
This is applied to loads with equipment like conveyors and cranes that require the same torque at low
speeds as at rated speeds.
* To increase the torque further, increase the setting value of the manual torque boost value 1 ().
2) Setting for fans and pumps
Setting of V/F control mode selection  to  (variable torque)
6
This is appropriate for load characteristics of such things as fans, pumps and blowers in which the torque is
proportional to the square of load rotation speed.
.
Base frequency voltage


0
Base frequency voltage


0
Base frequency 
Output frequency (Hz)
Base frequency 
F-20
E6582175
Output frequency (Hz)
 Refer to section 6.4 for details.