
(6) N/M of feed gear (F⋅FG)
2084 n for flexible feed gear
2085 m for flexible feed gear
Setting for the α Pulsecoder in the semi-closed mode
F⋅FG numerator (≤ 32767)
Necessary position
feedback pulses per
motor revolution
F⋅FG denominator (≤ 32767)
=
1,000,000 (Note 2)
(Note 1)
(as irreducible
fraction)
NOTE
1 For both F⋅FG number and denominator, the maximum setting value
(after reduced) is 32767.
2 αi Pulsecoders assume one million pulses per motor revolution,
irrespective of resolution, for the flexible feed gear setting.
3 If the calculation of the number of pulses required per motor revolution
involves π, such as when a rack and pinion are used, assume π to be
approximately 355/113.
[Example] For detection in 1 mm units, specify as follows:
Ball screw lead
(mm/rev)
Number of necessary
position pulses
(pulses/rev)
F⋅FG
10
20
30
10000
20000
30000
1/100
2/100 or 1/50
3/100
[Example]
If the machine is set to detection in 1/1,000 degree units with a gear
reduction ratio of 10:1 for the rotation axis, the table rotates by 360/10
degrees each time the motor makes one turn.
1000 position pulses are necessary for the table to rotate through one
degree.
The number of position pulses necessary for the motor to make one turn
is:
360/10 × 1000 = 36000 with reference counter =36000
F⋅FG numerator 36,000 36
F⋅FG denominator
=
1,000,000
=
1,000
FD
r
Desi
n
Page
Title
1
Data
Desi
n Description
Data
FANUC Series30i /31i /32i -MODEL A
Maintenance manual
Appliance of 9 digits for the reference counter on the
servo setting screen Ver.02
B-63945EN/02-04
05.06.14
K. Tanaka
Draw
No.
05.10.04
02
P4 The error in writing of parameter No.2000
has been corrected.
Y. Fukui