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Electronic Gear Ratio Setting Method (2) - Using the Electronic Gear Ratio Numerator and
Electronic Gear Ratio Denominator
1. Understand the overall system specifications
Obtain the System Specifications first in order to determine the Electronic Gear Ratio, such as:
Reduction Ratio, Gear Ratio, the quantity of movement for one revolution of the Load Axis, the
diameter of the Roller and the Number of Pulses in One Revolution of the Motor Encoder, Please refer
to "1-1-2 Confirmation of Servo Motor Model".
2. Define One Pulse Command Moving Distance
Define the distance that the Transmission Device will move when the Supervisory Controller
issues a Pulse Command. For example: When One Pulse Command moves 1um, if the Supervisory
Controller issues 2000 Pulse Commands, the Transmission Device will move
2mm1um/pulse2000pulse
(provided that the Electronic Gear Ratio is set correctly).
3. Calculate Electronic Gear Ratio
If the Deceleration Ratio between the Motor and the Load Shaft is
m
n
(m refers to the number
of Motor rotations and n the number of Load Shaft rotations), the Electronic Gear Ratio formula is as
follows:
Distance of the load movement
one pulse command moving distance
by one revolution of load shaft
Motor encoder resolution
Electronic Gear Ratio
m
n
The Communication Encoder 15/17/23bits, the number of Pulses in One Revolution is 2 to the [bits]
power.
EX: 1. 17bits Encoder's number of Pulses in One Revolution = 2
17
= 131072
2. 23bits Encoder's number of Pulses in One Revolution = 2
23
= 8388608
4. Electronic Gear Ratio Parameters Setting
Pn354 Single Rotation Pulse Command Function
Initial Value Unit Setting Range Effective RS-485 Address
0 pulse
0 ~ 32768 (15bit encoder)
0 ~ 131072 (17bit encoder)
0 ~ 8388608 (23bit encoder)
Power Re-set 0341H/0342H
Setting Description: If to use the functions of Pn302~Pn306, please set Pn354 = 0~63.
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