Specifications

15
flowserve.com
MX Protection, Control and Monitoring Features FCD LMENTB2300-01 – 07/08
View Control Compartment Temperature (View Power Supply Menus)•
View FDA (Frequency Domain Analysis)•
4.3 Frequency Domain Analysis (patent pending)
The Frequency Domain Analysis (FDA) methodology for the MX is based upon capturing torque, posi-
tion, or speed values at regular time intervals while the actuator is motoring, and then calculating the
resulting data set with a Fast Fourier Transform (FFT). This converts the actuator’s torque, position,
or speed signature from the time to the frequency domain. The resulting information is very useful
for pinpointing any components in the mechanical drive train that have failed or are about to fail. For
example, if some part of the mechanical system has been fabricated with a physical defect, has been
exposed to severe operational levels, or is nearing the end of its normal life, the FDA will be able to
detect and report a frequency variation in a chart or plot that can be correlated to the damaged part
when compared to the baseline.
MX FDA is established during the End of Line test analysis of the actuator after assembly and prior
to shipping. This is “FDA Baseline” and is unique for each MX that ships to a customer. Once the
MX has been assembled to a valve, the OEM or end user can record “FDA #2”, the signature for that
unique MX and valve combination. Both of these traces are stored in non-volatile memory, which
protects the data from spurious events. Each time the MX and valve combination is cycled in the
field, FDA #3 is recorded. This data is refreshed with each cycle, ensuring that the very latest FDA is
retained for analysis.
Only the Flowserve Limitorque MX has the FDA feature in its View Diagnostics menus. FDA can also
be downloaded to the Dashboard software tool for viewing and analysis.
Figure 4.1 – FFT of a sound, efficient worm gear set
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Magnitude (Normalized)
RPM