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This screen is important for detection of the mechanical looseness. When the graph shows a number
of lines (typically 3 or 4) with the same space between them and the first line is on the speed
frequency (see the value description on the bottom) probably mechanical looseness is the machine
problem.
The most common causes of this defect are:
- soft flanges,
- loose anchoring bolts,
- cracks in frames – cracked welds,
- free play in rotational part seating,
- or possibly other problems not related to mechanical looseness,
- bent shaft.
See also FASIT chapters.
Time signal for bearing condition evaluation
The time signal of bearing vibrations is displayed. g
modulated signal - see Methods for ball bearing condition diagnostics chapter. Caution – the time
signal is displayed as a direct record, not after envelope modulation. Look at three basic screens for
easy work with this function.
Undamaged bearing:
This bearing generates a low amplitude noise only, whose time record shape is steady.
It's necessary to have a look on the range of the graph (left side). Signal could look high but it's not
when the graph range is low (for instance 0,5 g).
Further technical and contact information can be found at www.adash.com
value is under the time signal (envelope
ENV
52
Adash 4900 – Vibrio M
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