Electronic Gear; Parameters Requiring Settings; Operation - Omron SMARTSTEP 2 SERIES User Manual

5-5 Electronic Gear

5-5 Electronic Gear

The Servomotor can be rotated for the number of pulses obtained by multiplying the command
pulses by the electronic gear ratio.
This function is effective in the following cases:
When fine-tuning the position and speed of two lines that are to be synchronous.
When using a position controller with a low command pulse frequency.
When you want to set the machine travel distance per pulse, to 0.01 mm for example.

Parameters Requiring Settings

Parameter
5
No.
Electronic Gear
Pn46 Ratio Numerator 1
*1
Electronic Gear
Pn47 Ratio Numerator 2
*1
Electronic Gear
Pn4A Ratio Numerator
Exponent
Electronic Gear
Pn4B Ratio
Denominator
*1. The Electronic Gear Switch Input (GESEL) is used to switch between Electronic Gear Ratio

Operation

Calculation Method
The following equation shows the relation between the number of internal command pulses (F)
after the electronic gear ratio multiplication and the number of command pulses (f) per Servomotor
rotation.
The Servomotor has a 2,500 pulses/rotation encoder. Therefore, the number of internal command
pulses (F) in the Servo Drive is 10,000 pulses/rotation (2,500 pulses/rotation × 4).
Given the conditions above, the relation between the number of command pulses per Servomotor
rotation (f) and the electronic gear ratio is as follows:
5-9
Parameter name
Set the pulse rate for command pulses and Servomotor travel dis-
tance.
Electronic Gear Ratio Numerator 1 (Pn46)
Electronic Gear Ratio Numerator 2 (Pn47)
The maximum value of the calculated numerator is 2,621,440.
Any higher setting than this will be invalid, and the numerator will
be 2,621,440.
Numerator 1 (Pn46) and Electronic Gear Ratio Numerator 2 (Pn47).
Pn4A
Pn46 × 2
F = f ×
Pn4B
Pn4A
Pn46 × 2
F 10000
= =
f f
Pn4B
Explanation
Electronic Gear Ratio Numerator Exponent (Pn4A)
or
x 2
Electronic Gear Ratio Denominator (Pn4B)
( Encoder resolution (by a factor of 4)
=
Number of command pulses for Servomotor rotation
Reference
Page 5-50
Page 5-51
)