3. 3 Simple operation of the VF-A7 [2] [Torque control mode]

An operation mode can be selected from among three: control panel operation, terminal board operation and combination of both.

[Terminal operation] : Operation by means of external signals

[Operating panel operation] : Operation by pressing keys on the control panel

[Operating panel+terminal operation] : Frequency, start/stop signals can be sent individually from the Operating panel and terminal board.

Torque control (motor torque)

Reference torque set with an external signal

Load torque

Speed

Motor torque

Speed limit level

Coast stop

The rotating speed varies according to the load torque.

StandbyST-CC

Start of operationF-CC

ON

ON

3.3.1 Setting a control mode

[Torque control mode]

The inverter has been set by default to the speed control mode (V/f constant). When us ing the torque control mode, therefore, it is necessary to switch control modes.

Step 1: Setting the basic parameter  (motor control mode selection) at

(sensor-less vector control (speed/torque switching)

 

[Setting

procedure]

 

 

Key operated

LED display

Operation

 

 

 

 

The operation frequency is displayed. (Make this setting when

 

 

 



the motor is out of operation.)(If the monitor display mode

 

 

 

 

setting parameter is set at  [Running frequency])

 

MON

 



Press the [MON] key to call up the first basic parameter 

 

 

(automatic acceleration/deceleration).

 

 

 

 

 



Select by pressing the or key.

 

 

 

 

 

 

ENT

 

Press the Enter key to display the parameter setting.

 

 

 

 

 

 

 

Change the parameter setting to  (sensorless vector control

 

 

speed/torque switching) by pressing the key.

 

 

 

 

 

ENT

 



Press the Enter key to save the change. Then,  and the set

 

 

value are displayed alternately.

 

 

 

 

 

 

 

 

 

 

 

 

 

C-8

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Image 46
Toshiba instruction manual Simple operation of the VF-A7 2 Torque control mode, Setting a control mode