
2. SETTING αiS/αiF/βiS SERIES SERVO PARAMETERS B-65270EN/05
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2622 (FS15i)
Reference counter capacity (denominator)
2179 (FS30i, 16i)
[Valid data range] 0 to 32767
A value up to around 100 is assumed to be set as the denominator of
the reference counter capacity. Note that if a larger value is set, the
grid width becomes too small, which makes it difficult to perform
reference position return by grid method.
The denominator parameter is not indicated in the servo setting screen,
so it must be set in the parameter screen.
In this example, set the numerator and denominator, respectively, to
20000 and 17.
NOTE
The reference counter capacity takes only an
integer. If a fraction is specified for it, an interval
between points where reference counter = 0 is
corrected.
(It is impossible to control a position where the
number of pulses is smaller than one because of
the pulse control principle, grid interval correction is
performed in such a way that the grid point error
will always be less than one detection unit.)
(a)-2 Method of changing the detection unit
The number of position pulses necessary for the motor to make one
turn is: 20000/17
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 30i,15i,16i,0i,
PowerMatei, and other CNC
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. 1826, 1827
No. 1828
No. 1829
Nos. 1851, 1852
Changing the detection unit from 1 µm to 1/17 µm requires
multiplying each of the parameter settings made for the detection unit
by 17.
CAUTION
In addition to the above parameters, there are
some parameters that are to be set in detection
units. For details, see Appendix B.