
B-65150E/04 2. SETTING α SERIES SERVO PARAMETERS
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Example of setting
α pulse coder and semi-closed loop (1-µm detection)
Ball screw lead
(mm/revolution)
Necessary number of
position pulses
(pulse/revolution)
Reference
counter
Grid width
(mm)
10
20
30
10000
20000
30000
10000
20000
30000
10
20
30
When the number of position pulses corresponding to a single motor
revolution does not agree with the reference counter setting, the
position of the zero point depends on the start point.
Should this occur, eliminate the difference by changing the detection
unit.
Example of setting
System using a detection unit of 1 µm, a ball screw lead of 20
mm/revolution, a gear reduction ratio of 1/17, the number of position
pulses corresponding to a single motor revolution set to 1176.47, and
the reference counter set to 1176
In this case, increase all the following parameter values by a factor of
17, and set the detection unit to 1/17 µm.
Parameter modification Series 0-C
Series 15, 16,
18, 20, 21,
Power Mate
Power
Mate-E
FFG
CMR
Reference counter
Effective area
Position error limit in traveling
Position error limit in the stop state
Backlash
Servo screen
Servo screen
Servo screen
Nos. 500 to 503
504 to 507
593 to 596
535 to 538
Servo screen
Servo screen
Servo screen
Nos. 1826, 1827
1828
1829
1851, 1852
Nos. 1084, 1085
100
324
200
202
231
221
(All other CNC parameters set in detection units, such as the amount of
grid shift and pitch error compensation magnification, are also
multiplied by 17.)
Making these modifications eliminates the difference between the
number of position pulses corresponding to a single motor revolution
and the reference counter setting.
Number of position pulses corresponding to a single motor revolution =
20000
Reference counter setting = 20000
CAUTION
In addition to the above parameters, there are some
parameters that are to be set in detection units.
For details, see Appendix C.