
5. DIGITAL SERVO
B–63325EN/03
310
(ii) To set command multiplication ratio = 1/2 to 1/27:
(The optional command multiplication function is needed.)
Set parameter ACM (bit 7 of parameter No. 1816) to 1, then set
parameter No. 1820 to the following value:
Setting = 1/(command multiplication ratio)
Valid data range: 1 to 27
1821 Axial command multiplication numerator (optional command multiplication)
Specifies an axial command multiplication numerator value. The
optional command multiplication function is needed.
1822 Axial command multiplication denominator (optional command multiplication)
Specifies an axial command multiplication denominator value. The
optional command multiplication function is needed.
Setting parameter Nos. 1821 and 1822 to a nonzero value makes the
setting of the optional command multiplication ratio n/m (n in 1821
and m in 1822) effective.
(5) Switch the power off and on again.
(6) Feed gear N/M
1977 n in flexible feed gear ratioPRM
1978 m in flexible feed gear ratioPRM
(i) Feed gear ratio for serial pulse coder A or serial α pulse coder
n
m
Number of feedback pulses per motor rotation
1000000
=
<<Example calculation>>
1/1000 mm 1/10000 mm
One motor rotation 8 mm
10 mm
12 mm
n=1/m=125
n=1/m=100
n=3/m=250
n=2/m=25
n=1/m=10
m=3/m=25
(7) Direction of movement
1879 Direction of motor rotationPRM
111 : Positive (clockwise) rotation
–111 : Negative (counterclockwise) rotation