Hitachi WJ200 - AUTO-TUNING

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AUTO-TUNING
In some cases, performing an auto-tune to get the proper motor constant will help in providing optimal performance when
operating in sensorless vector control mode A044 = 03. Before auto-tuning make sure that parameter H003 is set to a value of the
combined connected motors in kW’s, in some cases this value might be (1) size larger or smaller.
Use the step chart below to perform an auto-tune and to get / set the values.
Step
Instruction
1
Navigate to parameter H001 and change the value to (1) for static no rotation or (2) for rotational tune and press the
SET button to save the change.
2
IMPORTANT! – All limits are ignored during the auto-tune process. Be sure to make sure you have enough travel if
using the (2) rotational tune.
3
Using the pushbutton press the desired directional command to start the auto-tune. If rotational tune is selected the
motor will operate in the direction commanded.
4
Once the auto-tune is complete the display will show ( _ _ _ O). If the display doesn’t show an “O” that means the
auto-tune failed and you will need to restart the test.
5 Once the tune is complete, parameters H030, H031, H032 will contain the obtained R1, R2, L motor constants.
6 Set parameter H020 to the value found in H030.
7 Set parameter H021 to the value found in H031.
8 Set parameter H022 to the value found in H032.
9
Operate the VFD and verify if the changed motor constants have improved the performance.
If the performance is worse then change parameter H003 to a difference value and save it, then then change it back
to the original set value to restore the default motor constants.