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5.16 Electronic Gear Settings
5.16.1 Electronic Gear Ratio Settings
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5.16.1 Electronic Gear Ratio Settings
Set the electronic gear ratio using Pn20E and Pn210.
Calculating the Settings for the Electronic Gear Ratio

Rotary Servomotors
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:

Encoder Resolution
You can check the encoder resolution in the Servomotor model number.
When the Electronic Gear I s Not U s ed When the Electronic Gear I s U s ed
To move the load 10 mm:
10 × 1000
÷
20 × 256 = 128,000
pulses, so 128,000 pulses are input
as the reference.
To use reference units to move the load 10 mm:
If we set the reference unit to 1
μ
m, the travel
distance is 1
μ
m per pulse. To move the load 10
mm (10,000
μ
m), 10,000/1 = 10,000 pulses, so
10,000 pulses would be input as the reference.
Calculating the number of reference
pulses for each reference is trouble-
some. Calculating the number of reference pulses
for each reference is not necessary.
Set the electronic gear ratio within the following range.
0.001
≤
Electronic gear ratio (B/A)
≤
64,000
If the electronic gear ratio is outside of this range, an A.040 alarm (Parameter Setting Error) will
occur.
Pn20E
Electronic Gear Ratio (Numerator)
Setting Range Setting Unit Default Setting When Enabled Classification
1 to 1,073,741,824 1 64 After restart Setup
Pn210
Electronic Gear Ratio (Denominator)
Setting Range Setting Unit Default Setting When Enabled Classification
1 to 1,073,741,824 1 1 After restart Setup
Important
Position
Position
= = ×
B
A
Pn20E
Pn210
m
n
Electronic gear ratio
Encoder re s olution
Travel di s tance per load s haft revolution (reference unit s )
Rotation