Toshiba VF-PS1 Instruction Manual page 81

8) Energy-saving
Setting of V/f control mode selection = (Energy-saving)
Energy can be saved in all speed areas by detecting load current and flowing the optimum current that fits the load.
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.
9) Achieving further energy-saving
Setting of V/f control mode selection = (Advanced energy-saving)
More substantial energy savings than those provided by setting  to  can be achieved in any speed range by
keeping track of the load current and passing a current appropriate to the load.
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.
10) Precautions on vector control
1) When operating a motor in automatic torque boost mode or vector control mode (= ,  or ), enter each
motor constant indicated on the nameplate ( (base frequency),  (base-frequency voltage),  (rated
capacity of motor),  (rated current of motor) and  (rated number of revolutions of motor) ), read the
precautions on auto-tuning 1 on section 6.19 (1), and then set  to  (auto-tuning). If the cable length is in
excess of 30m, be sure to perform the auto-tuning (=) mentioned above, even when using a standard
motor recommended by Toshiba.
2) The sensorless vector control exerts its characteristics effectively in frequency areas below the base frequency
(). The same characteristics will not be obtained in areas above the base frequency.
3) Use a motor that has 2 to 16P.
4) Always operate the motor in single operation (one inverter to one motor). (Except for; =) Sensorless vector
control cannot be used when one inverter is operated with more than one motor.
5) The torque produced by the motor decreases more or less around the rated frequency because of a voltage drop
cause motor-generated torque in the vicinity of rated frequency to be somewhat lower.
6) Connecting a reactor or surge voltage suppression filter between the inverter and the motor may reduce motor-
generated torque. Setting auto-tuning 1 may also cause a trip (, ~)rendering sensorless vector
control unusable. In the event of a trip, perform auto-tuning with the inverter connected directly to the motor, or
enter the motor constant calculated from the motor test results.
7) Connect speed sensor for vector control with sensor to the motor. Connecting via gear, etc. causes motor's
oscillating or inverter's trip by lack of rigidity.
E-15
E6581386
5