YASKAWA SGD7S Product Manual page 186

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:
B
Pn20E
Electronic gear ratio =
A
Pn210
 Encoder Resolution
You can check the encoder resolution in the Servomotor model number.
SGM7J, SGM7A,
SGM7P, SGM7G,
SGM7F -
SGMCS -
SGMCV -
 Linear Servomotors
You can calculate the settings for the electronic gear ratio with the following equation:
When Not Using a Serial Converter Unit
Use the following formula if the linear encoder and SERVOPACK are connected directly or if a
linear encoder that does not require a Serial Converter Unit is used.
B Pn20E
=
Electronic gear ratio
A Pn210
When Using a Serial Converter Unit
B Pn20E
=
Electronic gear ratio
A Pn210
Encoder resolution
=
Travel distance per load shaft revolution (reference units)
Specification
Code
24-bit multiturn absolute encoder
7
24-bit incremental encoder
F
Code Specification
20-bit single-turn absolute encoder
3
20-bit incremental encoder
D
Specification
Code
22-bit single-turn absolute encoder
E
22-bit multiturn absolute encoder
I
Travel distance per reference unit (reference units) × Linear encoder resolution
=
Linear encoder pitch (the value from the following table)
Travel distance per reference unit (reference units) × Resolution of the Serial Converter Unit
=
Linear encoder pitch (setting of Pn282)
5.16 Electronic Gear Settings
5.16.1 Electronic Gear Ratio Settings
m
×
n
Encoder Resolution
16,777,216
16,777,216
Encoder Resolution
1,048,576
1,048,576
Encoder Resolution
4,194,304
4,194,304
5
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