4 - 5
4. OPERATION AND FUNCTIONS
4.1.5 Setting of full closed encoder electronic gear
(1) Parameters
No.
Abbreviation
Name and Function
Initial
Value
Unit
Setting
Range
65
FCM
Full closed electronic gear numerator
Set the numerator of the electronic gear relative to the
full closed encoder pulse.
1
1
to
65535
66
FCD
Full closed electronic gear denominator
Set the denominator of the electronic gear relative to
the full closed encoder pulse.
1
1
to
65535
Note 1. When changing the setting of the above parameter, set "000F" in parameter No. 40 "parameter block ( BLK)".
2. After setting the parameter marked , switch power off once. The setting is made valid by switching power on again.
(2) Parameter setting method
For the full closed electronic gear setting, set the ratio of the full closed encoder feedback to the servo
motor encoder feedback.
Make setting so that the full closed electronic gear
FCD
FCM does not fall outside the
FCD
FCM
1
100
100
1 <
<
range.
This setting must be made for all linear scales or rotary encoders.
[Setting example 1] When the servo motor is directly coupled with a ballscrew and the linear scale resolution is
0.05 m
Calculate the number of linear scale pulses per servo motor revolution.
[Setting example 2] When a rotary encoder at roll feed detection end is used for detection
When the pulley diameters or reduction ratios differ, consider that in calculation.
For the rotary encoder, make calculation using the number of pulses multiplied by 4.
CAUTION
If a wrong value is set in the linear scale electronic gear (parameter No. 65,
66), normal operation may not performed.
It may also cause a servo alarm (AL. 42) during positioning operation.
FCM
FCD
Number of servo motor encoder pulses per servo
Number of full closed encoder pulses per servo
Servo motor
Linear scale
<Conditions>
Servo motor resolution
: 131072pulse/rev
Ballscrew lead
: 4mm
Linear scale resolution
: 0.05 m
FCM
FCD
131072
80000
1024
625
Ballscrew lead / linear scale resolution 4mm/0.05 m 80000pluse
Servo motor
Pulley diameter d2 20mm
Pulley diameter d1
30mm
Rotary encoder
5000pulse/rev
<Conditions>
Servo motor resolution
: 131072pulse/rev
Servo motor side pulley diameter
: 30mm
Rotary encoder side pulley diameter
: 20mm
Rotary encoder resolution
: 5000pulse/rev
(20000 pulses/rev after multiplication by 4)
FCM
FCD
131072 20
20000 30
8192
1875
Summary of Contents for Melservo-J2-SUPER series
Page 19: ...1 6 1 FUNCTIONS AND CONFIGURATION MEMO...
Page 49: ...2 30 2 LINEAR SCALES MEMO...
Page 85: ...5 8 5 PARAMETERS MEMO...
