
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 038
Edit Date Design Description
/ 081
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.
fi is feed forward coefficient (%). And PULCO is No.2023, PPLS is No.2024, SMDR1 is No.2084,
SDMR2 is No.2085. L is movable distance (detection unit) per one rotation of motor. Above formula
is for semi-closed system or separated serial rotary encoder system. Below formula is
generalization. The more the summation of all coefficients is near 100%, the more it is better result.
Ex.1. In case of semi-closed system with 200,000 pulses per motor revolution,
The parameters are set to PULCO=8192, PPLS=12500, N2084=20, N2085=100.
FORWi = 100% / 100 × 2
16
× 8192 / 200000 = 2684
The summation of all coefficients must adapt to near 2684 after adaptive mode.
Ex.2. In case of full-closed system with 1/32 reduction and 3600,000 pulses per C-axis revolution,
The motor revolution is 3600000 / 32 = 112500.
FORWi = 100% / 100 × 2
16
× 8192 / 12500 = 4772
If the adaptive mode doesn’t work well due to constant speed, set each coefficient to 4772/6=795. And you
are able to get the same effect as feed forward 100%.
Ex 3. 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
2256
-
2261
FORW1
− Feed forward coefficient W1 - W6
FORW6
L
PULCO
16
2
100
80
1
SMDR1
SMDR2
PPLS
PULCO
16
2
100
××=
××××=
fi
fi
FORWi