• If a trip error occurs during auto-tuning, the auto-tuning process will be force-terminated. In
this case, the inverter displays the alarm code for the trip error in preference to the abort
display. Check the cause of the trip error.
• If the auto-tuning process does not terminate, press the STOP/RESET key. Then, the process
will be force-terminated. Review the preset parameters and retry auto-tuning.
• If the auto-tuning process is terminated by STOP command input by pressing the STOP key or
by turning OFF the RUN command, the parameters for auto-tuning may be left in the inverter.
• When the control method is set to Free V/f setting, starting offline auto-tuning causes the
inverter to terminate the process with the abort display.
• The performance of sensorless vector control is sufficiently provided by simply executing offline
auto-tuning.
• However, motor parameter values change with time due to a temperature rise in the motor and many
other aspects. To compensate for such changes in the motor parameter values to perform more
stable operation with less torque changes, use the online auto-tuning function.
• The online auto-tuning function, measures the motor parameter values each time the inverter stops
the operation and applies them to the motor parameters used for sensor vector control.
• Sensor vector control can be used only for the 1st control method.
Note the following points before using this function.
• Before using the online auto-tuning function, be sure to perform offline auto-tuning. The data
required for online auto-tuning is calculated during offline auto-tuning.
• The online auto-tuning function will be activated for up to 5 seconds after the motor stops. (The
inverter executes DC excitation once for tuning the Motor Parameters R1 and R2, this result is not
displayed, however). If the RUN command is input during this period, the online auto-tuning
process will be aborted at that point because the RUN command is given priority. (In this case, the
tuning result will not be reflected.)
• If the DC injection braking on jogging stop function is enabled, online auto-tuning will start after
DC injection braking is completed.
• When the Multi-function Input S1 to S8 Selection (C001 to C008) is set to 54 (SON) or 55 (FOC),
the online auto-tuning function is not performed.
Operating Procedure
1
Set the 1st Motor Parameter selection (H002) to 02 (Online auto-tuning enabled).
The Auto-tuning Selection (H001) must be set to 00 (Disabled).
2
Input the RUN command.
The inverter will perform online auto-tuning automatically during the stop.
Online Auto-Tuning Function
Parameter
No.
Function name Data Default data Unit
H002
1st Motor Parameter
selection
00: Standard motor parameter
01: Auto-tuning
02: Auto-tuning (Online auto-tuning
enabled)
00 –
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