Toshiba VF-A7

E-5
(Automatic V/f mode setting) and (Motor control mode selection)
The automatic control parameter is designed to set motor control mode s election parameter
() and the auto-tuning parameter() by one operation. Therefore, changing the 
setting causes the settings of all related parameters to be changed autom atically.
Parameters set automatically
  
 is always displayed. 
Check the  setting (set value).
((constant torque) if no change is
made to )
Automatic torque boost
+auto-tuning Automatic torque boost
Executed (Returns
to  after
execution)
Vector control (speed) +
auto-tuning Sensor-less vector control (speed control)
Executed (Returns
to  after
execution)
Automatic energy-saving +
auto-tuning Automatic energy-saving +
sensorless vector control
Executed (Returns
to  after
execution)
To increase torque manually (V/f constant control)
The VF-A7 inverter has been set to this control mode by default.
This control mode in which the torque is kept constant is suitable for belt conveyers, a nd so on.
It is recommended to select this mode if you want to manually increase the starting torque.
To return to the V/f constant control mode after changing the setting of the param eter ,
Set the motor control mode selection parameter  at (constant torque)
=> Refer to 5.10
Note 1) If there is a need to further increase the torque, increase the torque boost rate, us ing the
manual torque boost parameter . For the procedure for setting the manual torque
boost parameter  => Refer to 5.12)
2) The square reduction torque characteristic (set the motor control mode selection
parameter at ) is ef fective in controlling such loads as fans and pumps.
=> Refer to 5.10