Automatic Torque Boost - Toshiba TOSVERT VF-AS1 Instruction Manual

2) Decreasing output voltage
Setting of V/f control mode selection
This is appropriate for load characteristics of such things as fans, pumps and blowers in which the torque in relation
to load rotation speed is proportional to its square.
Base frequency voltage 1
3) Increasing starting torque
Setting of V/f control mode selection
Detects load current in all speed ranges and automatically adjusts voltage output (torque boost) from inverter.
This gives steady torque for stable runs.
5
Note:This control system can oscillate and destabilize runs depending on the load. If that should happen, set V/f
control mode selection
Motor constant must be set.
If the motor you are using is a 4P Toshiba standard motor and if it has the same capacity as the inverter, there is
basically no need to set the motor constant.
To set the motor constant, enter the following information that is indicated on the motor nameplate, and then
execute the auto-tuning 1 command (
<Information indicated on motor nameplate>
(Base frequency),
current),
[V]
0
Base frequency voltage 1
[V]
0
:
The torque
boost rate is
adjusted
automatically.
to (Constant torque characteristics) and increase torque manually.
(Base frequency voltage),
(Motor rated rotational speed)
= (Voltage decrease curve
Base frequency
=

(Automatic torque boost)

Base frequency
= ).
(Motor rated capacity),
E-12
E6581301
Output frequency [Hz]
Output frequency [Hz]
(Motor rated