Toshiba TOSVERT VF-MB1 Instruction Manual page 114

* To increase the torque further, increase the setting value of the manual torque boost value 1 ().
2) Setting for fans and pumps
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.
in relation to is.
5
3) Increasing starting torque
Detects load current in all speed ranges and automatically adjusts voltage output (torque boost) from inverter.
This gives steady torque for stable runs.
Setting of V/F control mode selection  to  (variable torque)
Base frequency voltage


0
Setting of V/F control mode selection  to  (automatic torque boost control)
Base frequency voltage

:Automatically
adjusts the
amountof torque
boost.
Note: This control system can oscillate and destabilize runs depending on the load. In this case, set
V/F mode selection = (V/F constant) and increase manual torque boost .
Base frequency 
0
Base frequency 
E-20
E6581697
 Refer to section 5.12 for details.
Output frequency (Hz)
Output frequency (Hz)