Toshiba TOSVERT VF-MB1 - Page 114

E6581697
E-20
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* To increase the torque further, increase the setting value of the manual torque boost value 1 ().
 Refer to section 5.12 for details.
2) Setting for fans and pumps
Setting of V/F control mode selection  to  (variable torque)
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.
Output voltage(%
)
Base frequency voltage


Base frequency 
0
Output frequency (Hz)
3) Increasing starting torque
Setting of V/F control mode selection  to  (automatic torque boost control)
Detects load current in all speed ranges and automatically adjusts voltage output (torque boost) from inverter.
This gives steady torque for stable runs.
:Automatically
adjusts the
amountof torque
boos
t
.
Output voltage(%)
Base frequency voltage

Output frequency (Hz
)
Base frequency 
0
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 .