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Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
Chapter 4
Measurement Definition
Configuring Eccentricity Measurements
Eccentricity measurements are configured using the control in
Figure 82 - Eccentricity Controls
Table 40 - Configurable Parameters for Eccentricity Measurements
Parameters
Values
Comments
Tachometer
0 Disabled
1 (Tacho/Speed 0)
2 (Tacho/Speed 1)
Select the source for the tachometer that is used in the eccentricity
measurement.
When set to Disable the eccentricity measurement is performed using the
normal overall measurement.
Minimum
Peak/ Rev
4…600
Enter the minimum RPM that the eccentricity measurement is made per
revolution.
When speed is less than the minimum, the eccentricity measurement is
made using the normal overall measurement function.
TIP
When the speed is less than specified, or the tachometer is disabled so only
a normal overall measurement is performed, consideration should be made
to programming the controller to capture the maximum, and perhaps
minimum, eccentricity values per revolution – which it can calculate based
on speed. This is a useful capability as it allows operators to, using a jacking
gear, rotate the shaft to where the bow is vertical, which can help to
straighten the shaft while not in rotation.