YASKAWA SVC - Axis Selection

5.1 Motion Parameters
5.1.3 Axis Selection
5-5
5
Machine-Specic Motion Control
Electronic Gear Conversion
The formulas for electronic gear conversion are as follows:
 Reference Units to Pulses
 Pulses to Reference Units
5.1.3 Axis Selection
There are two types of position control: finite-length axis position control for round-trip opera-
tion and other tasks that are performed only within a specified range, and infinite-length axis
position control that is used for rotation in one direction only. Infinite-length axis position control
can work in one of two ways: It can be used to reset the position data to 0 after one rotation,
e.g, for belt conveyors, or to simply rotate in one direction only, without resetting the position
after one rotation. The Axis Selection parameter sets which of these types of position control to
use.
The parameters that are related to axis selection are listed in the following table.
To use the electronic gear by setting the motion parameters, set the electronic gear ratio in the
SERVOPACK parameters to 1:1. However, to use a 24-bit resolution encoder, refer to the follow-
ing section and set the electronic gear ratio in the SERVOPACK parameters.
5.4 Absolute Encoders with 24-Bit Resolution on page 5-53
The result will be the same as long as the ratio between the settings for fixed parameters No.
8 and No. 9 (m/n) is constant, e.g., m = 3 and n = 1.
Important
Information
Travel distance (pulses) = Travel distance (reference units) ×
No. 36 (Number of Pulses per Motor Rotation) × No. 8 (Servomotor Gear Ratio Term)
No. 6 (Travel Distance per Machine Rotation) × No. 9 (Machine Gear Ratio Term)
Travel distance (reference units) = Travel distance (pulses) ×
No. 6 (Travel Distance per Machine Rotation) × No. 9 (Machine Gear Ratio Term)
No. 36 (Number of Pulses per Motor Rotation) × No. 8 (Servomotor Gear Ratio Term)
Parameter
Typ e
No. Name Description Default
Fixed Parame-
ters
No.1 Bit 0
Function Selec-
tion Flags 1, Axis
Selection
This parameter specifies the position control
method for the controlled axis.
0: Finite-length axis
This is an axis that uses finite-length axis
position control or an axis that uses infinite-
length axis position control that rotates in one
direction only and does not reset its position
data after every rotation.
1: Infinite-length axis
This is an axis that uses infinite-length axis
position control that resets position data after
every rotation.
0
No. 10
Infinite-length
Axis Reset Posi-
tion (POSMAX)
This parameter sets the reset position of the
position data when the Axis Selection parame-
ter is set to 1 (Infinite-length axis).
360000