E6581386
E-14
5
Note 1: Restrict the amount of torque to boost () to 3% or so. Boosting the torque too much may impair the
linearity between points.
Note 2: If the V/f 5-point is set within the diagonally shaded area in the figure below, the V/f 5-point is placed
automatically on the boundary line (heavy line in the figure).
Voltage
Frequency
0
×
0.4413
100%
: Area in which the
V/f 5-point cannot
be set
6) Operating a permanent magnet motor
Setting of V/f control mode selection = (PM control)
Permanent magnet motors (PM motors) that are light, small in size and highly efficient, as compared to induction
motors, can be operated in sensorless operation mode. Note that this feature can be used only for specific motors.
For more information, contact your supplier.
7) Operating the motor at periodic speeds by means of a motor speed
sensor
Setting for V/f control mode selection = (PG feedback contro)
Set to to operate the motor at periodic speeds.
Use this setting when operating a motor two or more ranks lower in capacity than the inverter at periodic speeds.
A PG feedback device (optional) is needed. In addition, a motor with a speed sensor (encoder) should be used.
+Motor constant must be set.
The motor constant can be set in any of the following two ways:
1) Automatic setting
Enter the following information that is indicated on the motor nameplate, and then execute the auto-tuning 1
command (Set to , and then reset to .).
<Information indicated on motor nameplate>
(Base frequency), (Base frequency voltage), (Motor rated capacity), (Motor rated
current), (Motor rated rotational speed)
⇒ Refer to 6.19 selection 2.
2) Manual setting
Set each motor constant manually.
⇒ Refer to 6.19 selection 3.
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