Toshiba VF-A7 Setting suitable for fans and pumps, To increase the starting torque, Automatically

2) Setting suitable for fans and pumps

[Set the motor control mode selection  at (Variable torque mode).]

This control mode is used for such loads as fans, pumps and blowers, with the characteristic that the torque is proportional to the square of the rotating speed of the load.

Base-frequency voltage #1 

Output voltage [V]



0

Base frequency #1



Output frequency [Hz]

3) To increase the starting torque

[Set the V/F control selection parameter  at (Automatic torque boost).]

In this mode, the load current is monitored in all speed ranges and the inverter's output voltage is adjusted automatically so that the motor can always produce torque large enough for stable operation.

Base-frequency voltage #1



Output voltage [V]

：The torque
boost rate is adjusted	０	Base frequency #1
automatically.



Output frequency [Hz]

Note) Some loads produce vibration if operated in this control mode. For such a load, set the motor control mode selection parameter  at (V/f constant control) and manually set the torque boost rate.

★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 automatic torque		boost and the motor constant (auto-tuning)
at a time.	=> Refer	to 5.2.1) 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.

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