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Chapter 9
Trend and Transient Capture
Transient Capture Page
236
Page Overview
Figure 91 - Transient Capture Page
The transient capture page enables definition of the transient data
management facility of the module. The capabilities that are provided are
intended to help verify the capture of critical data necessary to diagnose
machine condition during its run up (start) and run down (stop) events. The
capabilities are designed to help verify the capture of critical data regardless of
whether;
• the event is scheduled or occurs unexpectedly,
• is a long or short duration event,
• or if the acceleration/deceleration of the machine is fast, slow, or
varying.
Observe, compare, and diagnose the behavior of machines, as their speed
changes often, to provide unique insight into the condition of the machine that
is impossible to obtain during its normal operating, constant speed, state.
When the speed of a machine changes, the dynamic forces that are applied to
its bearings and structure change, both in magnitude and in frequency. Non-
dynamic forces also change; thermal growth/contraction as the machine heats
up or cools down, bearing load as the machine load is increased or shed,
condenser vacuum pressure changes impart forces. These, and other start up/
coast down-specific changes, can help find otherwise unknown faults and
conditions before the fault propagates.
The controls on this page are active only when at least one speed input is
enabled. See
Speed Page on page
Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
121.
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