Toshiba TOSVERT VF-P7 Instruction Manual page 82

6) To increase starting torque and the accuracy while saving energy
[Set the motor control mode selection parameter  at 
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. In addition, the output
current is optimally adjusted for energy saving according to the load applied.
This function 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, and
(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 . In this mode, you can make the setting of both the
automatic energy-saving 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.
7) To set the V/F characteristic arbitrarily
[Set the V/f control selection parameter  at (V/f 5-points setting).]
In this mode, the base frequency and the base-frequency voltage for the V/f control need to
be set to operate the motor while switching a maximum of 5 different V/f characteristics.
[
Parameter setting]
Title
V/f 5-point setting V/F1 frequency

V/f 5-point setting V/F1 voltage

V/f 5-point setting V/F2 frequency

V/f 5-point setting V/F2 voltage

V/f 5-point setting V/F3 frequency

V/f 5-point setting V/F3 voltage

V/f 5-point setting V/F4 frequency

V/f 5-point setting V/F4 voltage

V/f 5-point setting V/F5 frequency

V/f 5-point setting V/F5 voltage

※ 100% adjustment value (200V class: 200V, 400V class: 400V)
Base frequency voltage #1
Output voltage [V]

Note) Do not set the manual torque boost () above 5%. Boosting the torque too much may impair the
linearity between points.
(Sensor-less vector control + automatic energy-saving).]
=> Refer to selection 2 in 6.20 for details.)
=> Refer to selection 3 in 6.20 for details.
Function
V/f 5-point setting




VF1

VF2

０
 
E-20
=> Refer to 5.2.3) for details.
Adjustment range
∼ [Hz]
∼ [%] ※
∼ [Hz]
∼ [%] ※
∼ [Hz]
∼ [%] ※
∼ [Hz]
∼ [%] ※
∼ [Hz]
∼ [%] ※
VF5
VF4
VF3
  
Default setting










Output frequency

[Hz]