YASKAWA SGD7S Product Manual page 185

5.14 Electronic Gear Settings
5.14.1 Electronic Gear Ratio Settings
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.
SGM7J, SGM7A,
SGM7P, SGM7G -
SGM7E, SGM7F -
 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.
Electronic gear ratio
When Using a Serial Converter Unit
Electronic gear ratio
5-42
B
Pn20E
= =
A
Pn210 Travel distance per load shaft revolution (reference units)
Code
6
7
F
Code
7
F
SGMCS -
Code
3
D
SGMCV -
Code
E
Travel distance per reference unit (reference units) × Linear encoder resolution
B
Pn20E
= =
Linear encoder pitch (the value from the following table)
A Pn210
Travel distance per reference unit (reference units) × Resolution of the Serial Converter Unit
B Pn20E
= =
A Pn210
Encoder resolution
Specification
24-bit batteryless multiturn absolute encoder
24-bit multiturn absolute encoder
24-bit incremental encoder
Specification
24-bit multiturn absolute encoder
24-bit incremental encoder
Specification
20-bit single-turn absolute encoder
20-bit incremental encoder
Specification
22-bit single-turn absolute encoder
22-bit multiturn absolute encoder
I
Linear encoder pitch (setting of Pn282)
m
×
n
Encoder Resolution
16,777,216
16,777,216
16,777,216
Encoder Resolution
16,777,216
16,777,216
Encoder Resolution
1,048,576
1,048,576
Encoder Resolution
4,194,304
4,194,304