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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.
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.
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.
(1) The torque
boost rate is adjusted
automatically.
Base-frequency voltage #1
Output frequency [Hz]Base frequency #1
Base-frequency voltage #1
Base frequency #1
0
Output frequency [Hz]
Output voltage [V]
Output voltage [V]