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If auto-tuning has not been performed, proper performance may not be achieved for Closed Loop Vector Con-
trol. Perform auto-tuning or set the motor parameters through hand calculations. Alternatively, change the
Control Mode Selection to V/f Control (A1-02 = 0 or 1).
îš„Oscillation and hunting occur with PID control.
If there is oscillation or hunting during PID control, check the oscillation cycle and individually adjust P, I,
and D parameters. (Refer to page -99, Using PID Control.)
îš‹ If the Motor Rotates Even When Inverter Output is Stopped
If the motor rotates after a deceleration when the Inverter is stopped due to a large inertial load, DC-injection
braking may be necessary. Adjust the DC injection braking as follows.
• Increase parameter b2-02 (DC Injection Braking Current).
• Increase parameter b2-04 (DC Injection Braking Time at Stop).
îš‹ If Output Frequency Does Not Rise to Frequency Reference
îš„The frequency reference is within the jump frequency range.
When the jump frequency function is used, the output frequency does not change within the jump frequency
range. Check to be sure that the Jump Frequency (d3-01 to d3-03) and Jump Frequency Width (d3-04) settings
are suitable.
îš„The frequency reference upper limit has been reached.
The output frequency upper limit is determined by the following formula:
Freq Ref Upper Limit = Max. Output Frequency (E1-04) x Frequency Reference Upper Limit (d2-01) /100
Check to be sure that the parameter E1-04 and d2-01 settings are suitable.
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