13.4 Utility Function (Fn) Operations on the Panel Operator
13.4.14 Manually Adjust Motor Current Detection Signal Offset (Fn00F)
13-22
13.4.14
Manually Adjust Motor Current Detection Signal Offset
(Fn00F)
Refer to the following section for information on this utility function other than the procedure.
6.16.2 Manual Adjustment on page 6-103
* Examples of the Amount of Change to Adjust Offsets
• First time: 10 units at a time
• Second time: 5 units at a time
• Third time: 1 unit at a time
The above values are guidelines. Vary the amount of change and the number of repetitions according to your sys-
tem.
Step
Panel Display after
Operation
Keys Operation
1
Press the MODE/SET Key to enter Utility Function
Mode.
2 Press the UP Key or DOWN Key to display Fn00F.
3
First you adjust the offset for phase U (Cu1-o). Press
the DATA/SHIFT Key for approximately one second.
The display shown at the left will appear.
4
Press the DATA/SHIFT Key. The amount of offset for
phase U will be displayed.
5
Press the UP Key or DOWN Key to change the
amount of offset. Change the setting by approximately
10 units at a time in the direction that reduces the
torque ripple to find the value that minimizes the torque
ripple, and set that value.
Adjustment range: -512 to +511
6
Press the DATA/SHIFT Key. The display shown on the
left will appear again.
7
Next you adjust the offset for phase V (Cu2-o). Press
the MODE/SET Key for approximately one second.
The display shown at the left will appear.
8
Press the DATA/SHIFT Key. The amount of offset for
phase V will be displayed.
9
Press the UP Key or DOWN Key to change the
amount of offset. In the same way as for the phase-U
adjustment, change the setting by approximately 10
units at a time in the direction that reduces the torque
ripple to find the value that minimizes the torque ripple,
and set that value.
Adjustment range: -512 to +511
10
Press the DATA/SHIFT Key for approximately one sec-
ond. Cu2-o will be displayed, and then Fn00F will be
displayed again.
11
Reduce the amount by which you change the offsets each time and repeat steps 3 to 10* to fine-tune
the amounts of offset.
MODE
/
SET
DATA
/
MODE
/
SET
DATA
/
MODE
/
SET
DATA
/
MODE
/
SET
DATA
/
MODE
/
SET
DATA
/
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