3 electronic gear, 1) electronic gear ratio, Rotation – Yaskawa Sigma-5 User Manual: Design and Maintenance - Rotary Motors - MECHATROLINK-II Communications Reference User Manual

Page 110

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4.4 Trial Operation

4-25

4

Ope

rat

ion

4.4.3 Electronic Gear

The electronic gear enables the workpiece travel distance per reference unit input from the host controller. The

minimum unit of the position data moving a load is called a reference unit.

(1) Electronic Gear Ratio

Set the electronic gear ratio using Pn20E and Pn210.

If the gear ratio of the servomotor and the load shaft is given as n/m where m is the rotation of the servomotor

and n is the rotation of the load shaft,

When the Electronic Gear is Not Used:

Calculate the revolutions.
1 revolution is 6 mm. Therefore, 10 ÷ 6 = 10/6 revolutions.

When the Electronic Gear is Used:

Ball screw pitch: 6 mm

Workpiece

Encoder resolution (20 bit) 1048576

1

2

3

The section indicates the difference between using and not using an electronic gear when a
workpiece is moved 10 mm in the following configuration.

Calculate the required reference units.
1048576 reference units is 1 revolution. Therefore, 10/6

× 1048576 = 1747626.66 reference units.

Input 1747627 references as reference units.

Reference units must be calculated per reference.

→ complicated

The reference unit is 1

μm. Therefore, to move the workpiece 10 mm (10000 μm),

1 reference unit = 1

μm, so 10000 1 = 10000 reference units.

Input 10000 reference units.

÷

Calculation of reference units per reference is not required.

→ simplified

Rotation

Pn20E

Electronic Gear Ratio (Numerator)

Classification

Setting Range

Setting Unit

Factory Setting

When Enabled

1 to 1073741824

1

4

After restart

Setup

Pn210

Electronic Gear Ratio (Denominator)

Classification

Setting Range

Setting Unit

Factory Setting

When Enabled

1 to 1073741824

1

1

After restart

Setup

Position

Position

Electronic gear ratio:

=

A

B

Pn210

Pn20E

=

n

m

Encoder resolution

Travel distance per load
shaft revolution (reference units)

×

Rotation

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