Rockwell Automation 1440-VSE02-01RA XM-122 gSE Vibration Module - Manual (Page 66)

Publication GMSI10-UM013D-EN-P - May 2010
56 Configuration Parameters
XM-122 Measurement
Modes The XM-122 alternates between two measurement modes while it is actively
measuring the channel inputs: conventional mode and gSE mode.
The XM-122 operates in conventional vibration mode for a period of time
based on the configuration (table 3.A). During conventional mode, the module
measures the overall, spectrum, waveform, conventional bands, vectors, Not
1X, and sum harmonics values.
The module then reconfigures itself and transitions to gSE mode for a time
period based on the configuration (table 3.B). In gSE mode, the module
calculates gSE overall, gSE spectrum and gSE bands. The module then returns
to conventional mode, and the cycle repeats.
The most recent measured values are available via the 4-20mA outputs, the
XM Serial Configuration Utility, or the network configuration software.
During conventional and gSE mode, the module measures speed and
transducer bias.
If there is a tachometer fault and the conventional spectrum is configured to
be "synchronous," the conventional measurement will timeout and the gSE
measurement will take place. When the conventional mode is entered again,
the synchronous channel will re-attempt the spectrum/waveform collection.
IMPORTANT
The XM-122 can produce gSE measurements only with an
accelerometer. The gSE measurements are only available
for the channel when Eng. Units is set to "g."
TIP
Only when both Eng. Units are not set to "g" will the
XM-122 remain in conventional mode.