Hitachi SJ100 Instruction Manual page 155

4–38
Auto-tuning for Sensorless Vector Control
Note 6:
NOTE: When the data of the H Group parameters does not match that of the motor,
satisfactory performance may not be obtained during sensorless vector operation. The
stabilization adjustment (H_06) is also effective for V/f settings (00 and 01). Optimal
performance may not be achieved if the rating of a motor used is more than one frame
size smaller than the maximum applicable rating when the sensorless vector function is
used. You must disable sensorless vector operation when two or more motors are
connected. For optimal motor stability, set H_03 (H203) according to the rating of the
motor used, if its rating is not the same as the inverter rating.
Do not interrupt the auto-tuning procedure by removing power or by using the
Stop command, unless it is an emergency. If this does occur, initialize the
inverter's parameters to the factory default settings (see
Default Settings" on page
your application, and initiate the auto-tuning procedure again.
6–8). Then reprogram the parameters unique to
"Restoring Factory