Rockwell Automation 1440-SDM02-01RA XM-124 Standard Dynamic Measurement Module - Manuel (Page 65)

Rockwell Automation Publication 1440-UM001C-EN-P - May 2014 65
Configure the XM-124 Standard Dynamic Measurement Module Chapter 2
Measurement Mode
Select the Measurement mode according to the type of measurements to be
performed.
The Standard measurement mode performs the DC Bias (Gap), Overall, FFT,
and TWF measurements. The Standard measurement mode also performs the
following measurements, which are derived from the FFT data: four Band
measurements, 1X magnitude and phase, 2X magnitude and phase, 3X
magnitude, Not 1X, and Sum Harmonics. This is the same measurements that
are performed by the XM-120 Dynamic Measurement module. This is also the
same set of measurements performed by the XM-124 V6 firmware while the
Thrust Position measurement is not enabled.
The gSE measurement modes perform the g’s Spike Energy™ measurements. The
gSE measurements use a signal processing technique that provides an accurate
measure of the energy generated by transient or mechanical impacts. The gSE
measurements can provide early detection of surface flaws in rolling element
bearings, metal-to-metal contacts, insufficient bearing lubrication, and process-
related problems, such as dry running, cavitation, flow change, and internal re-
circulation.
Alternating gSE measurement mode alternates between the standard and gSE
measurement sets every several seconds. This is like the XM-122 gSE Vibration
module. In Alternating gSE mode, the four Band measurements can be derived
from either the standard or gSE FFT.
The Continuous gSE measurement mode performs the DC Bias, gSE Overall,
and gSE FFT measurements. The Continuous gSE mode also performs four
Band measurements, which are derived from the gSE FFT.
The Tracking Filter and Band Pass Filter measurement modes are designed
specifically for monitoring aeroderivative gas turbine engines, such as the General
Electric LM2500 engine.
Measurement
Mode Measurements performed
DC Bias (Gap) Overall FFT/TWF gSE Overall gSE FFT Tracking
Mag. + Phase Band Pass Thrust
Position Eccentricity
Standard
✓ ✓ ✓
Alternating gSE
(1)
✓ ✓ ✓ ✓ ✓
Continuous gSE
(1)
✓ ✓ ✓
Tracking Filter
✓ ✓ ✓ ✓
Band Pass Filter
✓ ✓ ✓ ✓
Thrust Position (2)
✓ ✓
Eccentricity (2)
✓ ✓
(1) Requires accelerometer transducer
(2) Requires displacement transducer