
Title 9083 / 9087 / 90A3 / 90A7
Learning Control Operator’s Manual
Draw No.
02 ‘99.01.14 K.Maeda Qualified 1’st issue
A - 63639E - 034
01 ‘97.12.08 K.Maeda Newly designed Sheet 030
Edit Date Design Description / 069
Data range : -32768 to 32767
Standard : 0
Feed forward coefficients FORWi are usually decided by Adaptive mode. Also you can calculate by the
following expression.
1
SDMR2
PULCO
2
16
××××=
i
f
FORWi
fi is feed forward coefficient (%). And PULCO (No.2023), PPLS (No.2024), SMDR1 (No.2084),
SDMR2 (No.2085).
(Example) In case of changing from SDMR1 = 10, SDMR2 = 100 to SDMR1 = 5, SDMR2 = 100,
FORWi (new) = FORWi (old) × 10 / 100 × 100 / 5
= FORWi (old) × 2
6.3 Adaptive method
The feed forward coefficients of the Adaptive preview control are decided with the following procedure.
A-1 Validate the Adaptive preview control and the Adaptive mode.
( No.2008#7 = 1 and No.2007#1 =1 )
A-2 Set the parameter of the forward order and the adaptation coefficient to standard setting.
( No.2254=4 and No.2255 =50 )
Set the feed forward coefficients to all 0. ( No.2256 - 2261 = all 0 )
And Learning control is invalid automatically during adaptation.
(Note) As soon as the error begins divergence, stop G05 by reset key on MDI to protect the machine from
excessive shock.
A-3 Operate the machine about several ten times of the learning cycle with a practical part program including
G05.
A-4 Check the position error with the checking board or the servo tuning display.
A-5 Step up adaptation coefficient (No.2255) every about 50.
Check Convergence of the position error to use the biggest coefficient so far as the error diverges.
A-6 Invalidate the adaptive mode. (No.2007#1 = 0)
The feed forward coefficients decided by the adaptive mode is not transported from servo to CNC on this
phase.
A-7 To transfer the feed forward coefficients to NC nonvolatile memory No.2256-61, set No.2007#2 = 1.
A-8 If the feed forward coefficients change from initial value to another one, the transportation to CNC
parameter has finished.
A-9 Set No.2007#2 = 0.
Finish with adaptive process.
The feed forward coefficients can be decided by these processes. Make sure No.2007#1 and #2 to be 0.
Note) In 90A7 series, you can use Adaptive preview control for both L-axis and M-axis.
2256
-
2261
FORW1
− Feed forward coefficient W1 - W6
FORW6