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4. Servo Adjustment
4 - 36
<Adjustment method>
[1] Set the servo specifications (SV017: SPEC)/bit1 to 1, and turn the NC power ON again.
[2] Measure the position droop overshooting while increasing the dual feedback control time
constant (SV051: DFBT) in increments of 5ms. Adjust to the time constant where overshooting
does not occur.
[3] For the final setting value, set a value 1.5 to 2-fold the value adjusted in 3.
No. Abbrev. Parameter name Explanation Setting range
SV017 SPEC* Servo specification
selection F E D C B A 9 8 7 6 5 4 3 2 1 0
spm mpt mp abs vdir fdir vfb seqh dfbx fdir2
bit Meaning when "0" is set Meaning when "1" is set
1 dfbx Dual feedback control stop Dual feedback control start
SV051 DFBT
Dual feedback
control time constant
Set the control time constant in dual feed back.
When "0" is set, the actual value that is set is 1ms.
The higher the time constant is, the closer it gets to the semi-closed
control, so the limit of the position loop gain is raised.
0 to 9999
(ms)
SV052 DFBN
Dual feedback
control non-sensitive
band
Set the non-sensitive band in the dual feedback control.
Set to "0" as a standard.
0 to 9999
(
µm)