Rockwell Automation 1440-PK02-05M2 XM-720 Machine Monitor - Manual (Page 60)

Publication GMSI10-UM001C-EN-E - June 2011
Glossary 60
For failsafe operation, the following are true:
• Under nonalarm (with power applied to the unit) conditions, the relay
closes the circuit between the common and the N.O. terminals
• Under alarm or loss-of-power conditions, the relay changes state to
close the circuit between the common and the N.C. terminals.
gSE measurement
A special type of signal processing. gSE, or Spike Energy, is useful for
detecting low amplitude, high frequency signals characteristic of bearing and
gearbox defects.
gSE spectrum
A special type of spectrum measurement using gSE signal processing. gSE, or
Spike Energy, is useful for detecting low amplitude, high frequency signals
characteristic of bearing and gearbox defects.
Help window
A window that contains help topics that describe the operation of a program.
These topics may include:
• An explanation of a command.
• A description of the controls in a dialog box or property page.
• Instructions for a task.
• Definition of a term.
high pass filter
A filter that excludes all frequencies below a defined frequency. It allows, or
passes, frequencies above the defined frequency. It is useful for removing low
frequency signal components that would dominate the signal.
low pass filter
A low pass filter excludes frequencies above a defined frequency. It allows, or
passes, frequencies below the defined frequency. It is useful as an anti-aliasing
filter.
non-failsafe
Non-failsafe means that when in non-alarm, the relay contacts are in their
"normal," de-energized, or "shelf-state" positions. In other words, the relay is
normally not energized and energizes (pulls in) upon alarm condition.