User manual
146 Rockwell Automation Publication MOTION-UM003F-EN-P - March 2015
Chapter 7 Commission
Scaling Dialog Box
Axis motion can be specified in whatever units you want. In the Scaling dialog
box, you configure the motion control system to convert between raw internal
motion units. For example, Feedback Counts or Planner Counts can be
converted to your preferred unit of measure, be it revolutions, degrees, meters,
inches, or candy bars.
This conversion involves three key Scaling Factor attributes, Conversion
Constant, Motion Resolution, and Position Unwind. If you use the Scaling dialog
box, the software calculates the Scaling Factors for you. The only task that you do
is select the Load Type that best matches the mechanical linkage between the
motor and the load.
There are four Load types:
• Direct Coupled Rotary
The load is directly coupled to the linear motor moving mass.
• Direct Coupled Linear
The load is directly coupled to the linear motor moving mass.
• Rotary Transmission
The rotational load is coupled to the motor through a geared transmission.
• Linear Actuator
The linear load is coupled to a rotary motor through a rotary to linear
mechanical system.
This is the default Scaling dialog box for a Direct Coupled Rotary load type. By
default, the Scaling dialog box is set for 1 ‘Position Unit’ per Motor Rev.
When you click Parameters you see values for the Conversion Constant and the
Motion Resolution, each having a value of 1 million. These values are generated
from the software calculator.
In most cases, the software scaling calculator generates Scaling Factor values that
are suitable for the application. But in rare cases, like applications that require
online product recipe changes, you can set the Scaling Source attribute to Direct
Scaling Factor Entry. This allows you to enter the Scaling Factors.
By default the Scaling dialog box is set
for 1 `Position Unit’ per Motor Rev.