LS ELECTRIC L7NHF Series, User Manual

Page: 236 / 409

10. Object Dictionary
10-44
0x2026 Denominator of Load Encoder Scale ALL
Variable
Type
Setting Range Initial Value Unit
Accessi
bility
PDO
Assignm
ent
Variable
Attribute
Savin
g
UINT 0 to 2147483647 1 - RW No
Power
cycling
Yes
Set the numerator/denominator scale for the load encoder to ensure the same scale with the motor
encoder,
Examples of scale setting methods
1. Direct connection
structure
This sets the scale so the number of external encoder pulses can be calculated
based on the number of encoder pulses per motor rotation.
Motor encoder
specifications
524288[pulse/rev]
Load movement
amount/revolution
12000[pulse/rev]
Gear ratio
Setting
Number of external encoder pulses x (numerator / denominator) = Number of
motor encoder pulses
•
12000(Number of external encoder pulses) ×
524288 ( numerato )
12000 ( denominato )
=
524288(
Number of motor encoder pulses
)
2. Reducer
structure
- Reduction ratio: 1/10
- Ball screw lead: 20 mm
- Linear encoder (external encoder): 4 um
If the 1/10-ratio reducer is installed on the motor, the reducer shaft rotates 1/10
turns per motor rotation. So, the scale is calculated by multiplying the
deceleration ratio with the number of external encoder pulses.
Motor encoder
specifications
524288[pulse/rev]
Load movement
amount/revolution
The movement of the table per rotation of the servo motor equipped with a 1/10
reducer is