Electronic Gear Ratio Settings - YASKAWA SGD7S Product Manual

5.14 Electronic Gear Settings

5.14.1 Electronic Gear Ratio Settings

5.14.1 Electronic Gear Ratio Settings
Set the electronic gear ratio using Pn20E and Pn210.
Important
Important
Pn20E
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:
Electronic gear ratio
 Encoder Resolution
You can check the encoder resolution in the Servomotor model number.
5-42
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.
The motor may not operate at the maximum speed depending on the encoder resolution and
electronic gear ratio setting. Refer to the following table for details.
Encoder Electronic
Resolution Gear Ratio
1,048,576 1
1
4,194,304
4
1
16,777,216
16
*
This is the speed when 115,343,500 reference units/s is set
for a parameter or command.
Electronic Gear Ratio (Numerator)
Setting Range Setting Unit
1 to 1,073,741,824
Electronic Gear Ratio (Denominator)
Setting Range Setting Unit
1 to 1,073,741,824
B Pn20E
= =
A
Pn210 Travel distance per load shaft revolution (reference units)
Motor Speed Limit*
-1
6,600 min
-1
1,650 min
-1
6,600 min
-1
413 min
-1
6,600 min
Default Setting
1 64
Default Setting
1 1
Encoder resolution
When Enabled Classification
After restart Setup
When Enabled Classification
After restart Setup
m
×
n