E6581301

5.6Selecting control mode

￿￿

: V/f control mode selection

Function

With “VF-AS1,” the V/f controls shown below can be selected.

0:Constant torque characteristics

1:Voltage decrease curve

2:Automatic torque boost (*1)

3:Sensorless vector control 1 (*1)

4:Sensorless vector control 2

5:V/f 5-point setting

6:PM control (*2)

7:PG feedback control (*3)

8:PG feedback vector control (*3)

(*1) “Automatic control” parameter automatically sets this parameter and auto-tuning 1 at a time. (*2) Use a dedicated motor with permanent magnets.

(*3) A PG feedback device (optional) is needed for this control.

[Parameter setting]

 

 

 

 

Title

Function

Adjustment range

Default setting

 

5

 

 

￿: Constant torque characteristics

 

 

 

 

￿: Voltage decrease curve

 

 

 

 

 

 

 

 

 

 

￿: Automatic torque boost

 

 

 

 

 

￿: Sensorless vector control 1

 

 

 

￿￿￿

V/f control mode selection

￿: Sensorless vector control 2

￿￿

 

 

 

 

￿: V/f 5-point setting

 

 

 

 

 

￿: PM control

 

 

 

 

 

￿: PG feedback control

 

 

 

 

 

￿: PG feedback vector control

 

 

 

!! Caution

Mandatory

When operating the inverter with ￿￿ set to ￿, ￿, ￿, ￿ or ￿, be sure to set the motor constant parameter correctly. Failure to do this may cause the inverter not to control the motor properly, and thus cause the motor not to deliver the desired performance. For more information, see the explanation of each ￿￿ setting in the following sections.

1) Constant torque characteristics (Normal way of use)

Setting of V/f control mode selection ￿￿=￿ (Constant torque characteristics)

This is applied to loads with equipment like conveyors and cranes that require the same torque at low speeds as at rated speeds.

Base frequency voltage 1

￿￿￿

Output voltage

 

￿￿

[V]/[%]

0

Output frequency [Hz]

Base frequency ￿￿

*To increase the torque further, increase the setting value of the manual torque boost parameter ￿￿.

￿For more details, refer to Section 5.7.

E-11

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Toshiba VF-AS1 Selecting control mode, Constant torque characteristics Normal way of use, Control mode selection