Allen-Bradley 1440-SDM02-01RA, User Manual, Page: 69 / 168

Rockwell Automation Publication 1440-UM001D-EN-P - September 2016 69
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 a set
of 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. The XM-120 Dynamic
Measurement module performs the same measurements. The XM-124 V6
firmware also performs the same set of measurements while the Thrust
Position measurement is not enabled.
The gSE measurement modes perform the Spike Energy™ measurements. The
gSE measurements use a signal processing technique that provides an accurate
measure of the energy that is generated by transient or mechanical impacts.
Table 8 - Transducer Power Settings
Transducer Power
Setting Approximate Expected Bias Voltage (V DC) DC Low Limit
Default DC High Limit
Default Buffered Output
Range
Properly connected sensor Unconnected sensor
or open circuit Short circuit
Off sensor bias voltage
(-10V DC1…0V DC typical) 2 0 -10 10 -12V…12V
IEPE sensor bias voltage
(12V DC…20V DC typical) 24 0 12 20 0V…24V
24 V sensor bias voltage
(1V DC…20V DC typical) 2 0 1 20 0V…24V
-24 V sensor bias voltage
(-14V DC…8 VDC typical) 2 0 -14 -8 -24V… 0V
Bias Current 0.47 V with 200 ohm coil 13 0 0.2 2 -12V…12V
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