
Title 90A3 / 90A7 / 90B3 / 90B7
Learning Control Operator’s Manual
03 ’05.01.13 K.Maeda 3
rd
. updated Draw No.
02 '03.01.06 K.Maeda 2
nd
. updated
A - 63639E - 070
01 ‘00.09.20 K.Maeda Newly designed Sheet 039
Edit Date Design Description
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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.