IAI America SCON-CA - Manual (Page 182)

Chapter 3 Operation
172
� Examples of electronic gear calculations:
When outputting the feedback pulse of the actuator equipped with an encoder with 10mm ball
screw lead and 16384pulse/rev in 0.02mm movement per pulse:
The electric gear numerator (FNUM) = 125, electric gear denominator (FDEN) = 4096 will
give the output of 1 pulse in 0.02mm of the actuator move.
Caution:
� The fraction has to be completely reduced so both the electric gear numerator
(FNUM) and electric gear denominator (FDEN) can be 4096 or less and make them
to be integral numbers. (Do not stop reducing the fraction on the way.)
� FNUM and FDEN on the line axis have to satisfy the following relative formulas.
� Do not attempt to establish a setting that gives a condition that electronic gear
numerator (FNUM) > electronic gear denominator (FDEN).
The formula is as shown above and the pulse output is based on the encoder pulse,
therefore evenly allocated feedback pulse responding to the velocity cannot be
output.
Electronic Gear
Denominator (FDEN)
Electronic Gear
Numerator (FNUM) = Ball Screw Lead Length [mm/rev]
No. of Encoder Pluses [pulse/rev]
�
Movement amount per pulse [mm]
=
10
16384
�
100
2
=
125
4096
2 31 �
Stroke Length [mm]
Ball Screw Lead Length [mm/rev]
� No. of Encoder Pluses [pulse] � FNUM
2 31 �
Stroke Length [mm]
Ball Screw Lead Length [mm/rev]
� No. of Encoder Pluses [pulse] � FDEM
1