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MELSEC-
A
5 DATA USED FOR POSITIONING CONTROL
Pr.3
Movement amount per rotation (Al),
Pr.4
Unit magnification (Am)
The amount how the workpiece moves with one motor rotation is determined by
the mechanical structure.
If the worm gear lead (mm/rev) is PB and the deceleration rate is 1/n, then
Movement amount per rotation (AL) = PB
1/n
However, the maximum value that can be set for this "movement amount per
rotation (Al)" parameter is 6553.5
m (approx. 6.5mm). Set the "movement amount
per rotation (Al)" as shown below so that the "movement amount per rotation (AL)"
does not exceed this maximum value.
Movement amount per rotation (AL)
= PB
1/n
= Movement amount per rotation (Al)
Unit magnification (Am)
Note) The unit magnification (Am) is a value of 1, 10, 100 or 1000. If the "PB
1/n" value exceeds 6553.5
m, adjust with the unit magnification so that the
"movement amount per rotation (Al) " does not exceed 6553.5
m.
Example 1)
When movement amount per rotation (AL) = PB
1/n = 6000.0
m (= 6mm)
Movement amount per rotation (AL)
= Movement amount per rotation (Al)
Unit magnification (Am)
= 6000.0
m
1
Example 2)
When movement amount per rotation (AL) = PB
1/n = 60000.0
m (= 60mm)
Movement amount per rotation (AL)
= Movement amount per rotation (Al)
Unit magnification (Am)
= 6000.0
m
10
= 600.0
m
100
M G
1
n
P
f
P
B
D75P2
Servo amplifier Servomotor
Workpiece
Encoder
Reduction gears
: Worm gear lead (mm/rev)
: Deceleration rate
: No. of encoder pulses (pulse/rev)
P
B
1/n
P
f
Movement amount per pulse l
l = [mm/pulse]
1
n
P
B
P
f