Toshiba TOSVERT VF-P7 Instruction Manual page 81

4) To increase starting torque and the accuracy of operation - Vector control
[Set the V/f control selection parameter  at (Sensorless vector control).]
In vector control mode, the VF-P7 inverter enables the Toshiba standard motor combined with it
to produce large torque even at extremely low speeds. The vector control mode is effective in:
(1) Obtaining large torque
(2) Achieving smooth and stable operation even in low speed ranges
(3) Eliminating load fluctuations due to slippage of the motor
(4) Making the motor produce large starting torque.
★This control mode involves the setting of the motor constant.
Basically, however, there is no need to set the motor constant if the inverter is used for a
Toshiba 4P motor with the same capacity as the inverter. The motor constant can be set in any
of the following three ways:
1)Set the basic parameter  at . With this parameter, you can make the setting of
both the sensorless vector control and the motor constant (auto-tuning) at a time.
2)Set the extended parameter  at . In this mode, the motor constant is set
automatically. (Auto-tuning)
3)
The constants of motors can also be set individually. => Refer to selection 3 in 6.20 for details.
[Procedure for setting the V/f control selection parameter  at
key operated, LED display
MON
▲
ENT
▲
ENT
5) To increase the starting torque while saving energy
[Set the motor control mode selection parameter  at 
In this mode, the load current is monitored in all speed ranges and the inverter's output
voltage (torque boost) is adjusted automatically so that the motor can always produce
torque large enough for stable operation. In addition, the output current is optimally
adjusted for energy saving according to the load applied.
★This control mode involves the setting of the motor constant.
Basically, however, there is no need to set the motor constant if the inverter is used for
a Toshiba 4P motor with the same capacity as the inverter.
The motor constant can be set in any of the following two ways:
1)Set the extended parameter  at . In this mode, the motor constant is set
automatically. (Auto-tuning)
2)The constants of motors can also be set individually.
The running frequency is displayed. (Make this setting when the
 motor is out of operation.)(If the monitor display selection
parameter  is set at [Running frequency])
Press the MON key to call up the first basic parameter

(Automatic acceleration/deceleration).
Switch to the parameter (Motor control mode selection)

by pressing △ key.
Press the Enter key to display the parameter setting (set

value). (Default setting: (Constant torque))
Change the parameter setting to (Sensorless vector

control) by pressing the △ key.
Press the Enter key to save the change. Then,  and the

set value  are displayed alternately.
(Automatic torque boost + automatic energy-saving).]
E-19
=> Refer to 5.2.2) for details.
=> Refer to selection 2 in 6.20 for details.

(Sensorless vector control)]
Operation
=> Refer to selection 2 in 6.20 for details.
=> Refer to selection 3 in 6.20 for details.