Electronic Gear; Parameters Requiring Settings; Operation - Omron SMARTSTEP 2 R88M-G 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
Pn46 × 2
F 10000
= =
f f
Pn4B
Explanation
Electronic Gear Ratio Numerator Exponent (Pn4A)
or
x 2
Electronic Gear Ratio Denominator (Pn4B)
Pn4A
( Encoder resolution (by a factor of 4)
=
Number of command pulses for Servomotor rotation
Reference
Page 5-50
Page 5-51
)