Flowserve 3400IQ - Manual (Page 18)

Logix 3400IQ Digital Positioner FCD LGENIM3403-00 – 11/07
Characterization Procedure
The following procedure outlines setting up a custom stroke characterization.
Figure 12: Custom Stroke Characterization Window
1. Verify the process is in a safe condition and that the valve may be taken out of service.
2. Put the Transducer block MODE_BLK out of service.
3. Make sure that Quick Opening Curve, Equal Percent Curve, nor Custom Characterization
Active are selected in CONTROL_FLAGS.
4. Enter the values for CURVEX and CURVEY to define the desired response. Care must be taken to
assure that each CURVEX value has the correct corresponding CURVEY value. The user may choose any
number in the range to define the curve. The 21 CURVEX points do not need to be evenly spaced, if so
desired. However, the CURVEX values must be in ascending (or equal) order. The CURVEY points may be
any value in the range, ascending or descending. The response is a linear interpolation, or straight-line,
response between points. All 21-points must be defined. (i.e. If only five point sets were needed to define the
desired operation, the remaining 16 points would need to be set to 110.)
5. Write the changes to the Logix 3400IQ digital positioner.
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