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4) Use a general purpose squirrel-cage motor with a capacity that is the same as the inverter's rated capacity or
one rank below.
The minimum applicable motor capacity is 0.05kW.
5) Use a motor that has 2-8 P.
6) Always operate the motor in single operation (one inverter to one motor). Sensorless vector control
cannot be used when one inverter is operated with more than one motor.
When using a combination of several motors, set the V/F constant (=).
7) The maximum length of wires between the inverter and motor is 30 meters. If the wires are longer than 30
meters, set standard auto-tuning with the wires connected to improve low-speed torque during sensorless
vector control.
However the effects of voltage drop cause motor-generated torque in the vicinity of rated frequency to be
somewhat lower.
8) When a reactor is connected between the inverter and a motor, the motor's generated torque may fall.
Setting auto-tuning may also cause a trip () rendering sensorless vector control unusable.
5.12 Manual torque boost - increasing torque boost at low
speeds
: Torque boost 1
• Function
If torque is inadequate at low speeds, increase torque by raising the torque boost rate with this
parameter.
Base frequency voltage
[Parameters]
Title
Torque boost 1
Valid when is set to 0 (V/F constant) or 1 (square reduction)
Note 1: The optimum value is programmed for each inverter capacity. Be careful not to increase the torque boost
rate too much because it could cause an overcurrent trip at startup.
Function
0.0 - 30.0 (%)
E-21
Output frequency (Hz)
Base frequency
Adjustment range
E6581595
5
Default setting
According to model
(See 11.4)
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