SSI Scaling
SSI Scaling
To have any useful meaning, the counts from the transducer must be scaled to position units. The Position Scale and Position Offset parameters define the position units as a function of transducer counts. RMCTools provides Scale/Offset wizards to guide you through the scaling process. This topic describes how to manually calculate these parameters for an SSI transducer.
To scale rotary SSI axes, see the Rotary Scaling topic.
Delta Recommends using the Scale/Offset Wizard for scaling the position. If you need to do it manually, read this topic.
Scaling Counts to Position Units
The RMC calculates the Actual Position every control-loop time using the following formula:
Actual Position [pu] = (Counts [cnt] x Position Scale [pu/cnt]) + Position Offset [pu]
Note:
If the Actual Position filter is applied, the RMC filters the Actual Position after calculating it with the above formula.
To correctly scale the axis for your particular applications, use the methods below to find the Position Scale and Position Offset parameters.
Determining the Scale and Offset
There are two methods of finding the correct Position Scale and Position Offset.
Method 2: Using the Transducer Resolution
See Also
Scaling Overview | Scale/Offset Wizard | Position Scale | Position Offset | Rotary Scaling
Copyright (c) 2005-2012 by Delta Computer Systems, Inc.