Rockwell Automation 1440-SDM02-01RA XM-124 Standard Dynamic Measurement Module - Manuel (Page 152)

152 Rockwell Automation Publication 1440-UM001C-EN-P - May 2014
Appendix B CIP Objects
Measurement Parameters
Tachometer Channel
Object (Class ID 326
H
)
The Tachometer Channel Object models front end processing performed on a
tachometer signal before specific measurements are performed.
Table 76 - Thrust Position Measurement Parameters
Parameter Name Description Values/Comments
Target Angle Sets the angle between the shaft and the
target surface. The target surface moves with
the shaft. The transducer is mounted
perpendicular to the target surface. degrees
Upscale Sets the movement of the target relative to
the transducer that is considered positive
displacement. Options:
• Away
• Towards
Calibration Offset
(XM Serial only) Enter the position of the current Transducer
DC Bias reading. mils
Calibration Bias Sets the zero or green position. The zero
position is the normal operating position.
Setting the zero position compensates for the
static gap. This enables the module to display
only the displacement around the zero
position.
Use one of the formulas below to calculate the
Calibration Bias. The formula that you use
depends on the Upscale setting and whether
Fault High and Fault Low are both less than
or equal to zero (0).
Upscale set to ‘Towards’ Formula
Calibration bias = Transducer DC Bias +
(Sensitivity x Calibration Offset) x sin (Target
Angle)
Upscale set to “Away” Formula
Calibration Bias = Transducer DC Bias -
(Sensitivity x Calibration Offset) x sin (Target
Angle)
If Fault High and Fault Low are both less
than or equal to 0, use one of these formulas:
Upscale set to “Towards” Formula
Calibration bias = Transducer DC Bias -
(Sensitivity x Calibration Offset) x sin (Target
Angle)
Upscale set to “Away” Formula
Calibration Bias = Transducer DC Bias +
(Sensitivity x Calibration Offset) x sin (Target
Angle)
Volts
Important: Check with the manufacturer
about operating thrust position and
acceptable tolerances before making any
adjustments.
Calculate Bias (XM
Serial only) Automatically calculates the Calibration
Bias value.