Mitsubishi Electric MELSEC-L LD75D, User Manual

Page: 122 / 818

120
(4) [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)
*1
*1 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.
Ex.
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 times
Ex.
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 times
Movement amount per pulse


PB: Worm gear lead (mm/rev)
1/n: Deceleration ratio
Pf: Number of pulses from encoder (pulse/rev)
CPU
module
LD75
Workpiece
M G
Programmable controller Servo amplifier Servomotor
Reduction gears
1
n
Encoder
Pf
PB
PB
Pf
[mm/pulse]
Δ ±
=
1
n
×