YASKAWA SGD7S series Product Manual page 189

5.16 Electronic Gear Settings
5.16.1 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.
GM7J, GM7A,
GM7P, GM7G,
GM7E, GM7F -
 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
5-48
B
Pn20E
= =
A Pn210
Travel di tance per load haft revolution (reference unit )
Code
7
F
GMC -
Code
D
GMCV -
Code
E
I
Travel di tance per reference unit (reference unit ) × Linear encoder re olution
B
Pn20E
=
=
Linear encoder pitch (the value from the following table)
A Pn210
Travel di tance per reference unit (reference unit ) × Re olution of the erial Converter Unit
B Pn20E
= =
A Pn210
Encoder re olution
pecification
24-bit multiturn ab olute encoder
24-bit incremental encoder
pecification
20-bit ingle-turn ab olute encoder
20-bit incremental encoder
pecification
22-bit ingle-turn ab olute encoder
22-bit multiturn ab olute encoder
Linear encoder pitch ( etting of Pn282)
m
×
n
Encoder Re olution
16,777,216
16,777,216
Encoder Re olution
1,048,576
1,048,576
Encoder Re olution
4,194, 04
4,194, 04