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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.
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])
Press the [MON] key to call up the first basic parameter
(automatic acceleration/deceleration).
Select “” by pressing the or key.
Press the Enter key to display the parameter setting.
Change the parameter setting to (sensorless vector control
speed/torque switching) by pressing the key.
Press the Enter key to save the change. Then, and the set
value are displayed alternately.
Torque control
(motor torque)
Reference torque set with an external signal
Motor torque
Load
torque
Speed limit level
The rotating speed varies according to the load torque.
ON
ON
Speed
Standby ST-CC
Start of operation F-CC
Coast stop
MON
ENT
ENT