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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-A7 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.
=> Refer to 5.2.2) for details.
2)Set the extended parameter at . In this mode, the motor constant is set
automatically. (Auto-tuning) => Refer to selection 2 in 6.20 for details.
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 (Sensorless vector control)]
key operated, LED display Operation
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.
5) To increase the starting torque while saving energy
[Set the motor control mode selection parameter at
(Automatic torque boost + automatic energy-saving).]
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) => Refer to selection 2 in 6.20 for details.
2)The constants of motors can also be set individually.
=> Refer to selection 3 in 6.20 for details.
MON
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