Rockwell Automation 2364F Regenerative DC Bus Supply Unit (RGU) - Manual (Page 115)

Publication 2364F-5.01– October 2003
Configuring Analog Input and Output Parameters 11-3
Figure 11.1
Scaling Process for Analog Outputs
DAC Source Parameters Use this parameter to specify the parameter number of the value that
you want sent to the analog output.
DAC Offset Parameters Use this parameter to add or subtract an offset from the source value.
An offset is arithmetically added to the source value.
To determine the relationship between the offset value and the source
value, do the following:
1. Verify that P6 (Unit Selection) is set to display engineering units.
2. Identify the maximum and minimum values of the source value.
3. Looking at the maximum and minimum source values, determine
the desired amount of offset and convert that amount to the
nearest integer.
4. Enter that integer value as your offset.
Important: The offset value is not scaled in relation to the source
value units; the offset value is directly added to the source value. The
large range of acceptable offset values is intended to provide
flexibility.
Note: When specifying an offset value, verify that the offset value
is of a desired magnitude when compared to DAC source
parameter.
Source Value
Offset Value
Gain Value
256
Low Pass
Filter
12-Bit
DAC
Output
Value
Filter Cutoff Frequency
Analog
Output
+
+
For example:
If you want to output P143 (Scaled Bus Feedback), enter 143
in the Source Parameter (P49 or P53).