YASKAWA E-S Series Product Manual page 107

5.4 Settings That Must Be Adjusted to the System
5.4.2 Electronic Gear Settings
The difference between using and not using the electronic gear is shown below.
In this example, the following machine configuration is used to move the workpiece 10 mm.
Resolution:
1,024 (10 bits)
If you do not use the electronic gear,
you must calculate the number of
reference pulses for each reference.
To move a workpiece 10 mm:

Calculate the number of revolu-
tions.
The motor will move 6 mm for each
revolution, so 10/6 revolutions are
required to move 10 mm.

Calculate the required number of
reference pulses.
One revolution is 1,024 pulses,
therefore
10/6 × 1,024 = 1,706.66 pulses.

Input 1,707 pulses as the refer-
ence.
Electronic Gear Ratio Settings
Set the electronic gear ratio using Pn20E and Pn210.
Important
Pn20E
Pn210
 Calculating the Settings for the Electronic Gear Ratio
If the gear ratio between the Servomotor shaft and the load is given as n/m, where n is the
number of load rotations for m Servomotor shaft rotations, the settings for the electronic gear
ratio can be calculated as follows:
Electronic gear ratio
 Encoder Resolution
You can check the encoder resolution in the Servomotor model number.
SGMSL -
5-24
Workpiece
Ball screw lead:
6 mm
Set the electronic gear ratio within the following range.
0.01 ≤ Electronic gear ratio (B/A) ≤ 100
If the electronic gear ratio is outside of this range, an A.040 alarm (Parameter Setting Error) will
occur.
Electronic Gear Ratio (Numerator)
Setting Range Setting Unit
1 to 65,535
Electronic Gear Ratio (Denominator)
Setting Range Setting Unit
1 to 65,535
B Pn20E
= =
A Pn210 Travel distance per load shaft revolution (reference units)
Code
K 10-bit incremental encoder
If you use the electronic gear, it is not necessary
to calculate the number of reference pulses for
each reference.
If you use reference units to move the work-
piece when one reference unit is set to 20
μm, the travel distance is 20 μm per pulse.
To move the workpiece 10 mm (10,000
μm), 10,000 ÷ 20 = 500 pulses, so 500
pulses would be input.
Default Setting
1 1
Default Setting
1 1
Encoder resolution
Specification Encoder Resolution
When Enabled Classification
After restart
When Enabled Classification
After restart
m
×
n
1,024
Setup
Setup