YASKAWA SGD7S

5.16 Electronic Gear Settings
5.16.1 Electronic Gear Ratio Settings
5-48
• Linear Servomotors
In this example, the following machine configuration is used to move the load 10 mm. We’ll
assume that the resolution of the Serial Converter Unit is 256 and that the linear encoder pitch
is 20 μm.
5.16.1 Electronic Gear Ratio Settings
Set the electronic gear ratio using Pn20E and Pn210.
Linear encoder
When the Electronic Gear Is Not Used When the Electronic Gear Is Used
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 μm, the travel
distance is 1 μm per pulse. To move the load 10
mm (10,000 μm), 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.
The setting range of the electronic gear depends on the setting of Pn040 = n.X (Encoder
Resolution Compatibility Selection).
• Pn040 = n.0 (Use the encoder resolution of the connected motor.)
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.
• Pn040 = n.1 (Use a resolution of 20 bits when connected to an SGM7J, SGM7A, or
SGM7G motor.)
Set the electronic gear ratio within the following range.
0.001 ≤ Electronic gear ratio (B/A) ≤ 4,000
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