Mitsubishi Electric MELSEC-L LD75P User Manual page 122

Positioning module

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Table of Contents

(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

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.

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

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

Programmable controller

Movement amount per pulse

Servo amplifier

PB: Worm gear lead (mm/rev)

1/n: Deceleration ratio

Pf: Number of pulses from encoder (pulse/rev)

Reduction gears

Troubleshooting

Melsec-l ld75d