Emerson 2130 RBM Consultant Pro, Справочное руководство

Страница: 180 / 394

3-100 Horizontal Alignment
If the fit is unsatisfactory (less than 85%), a warning message displays to inform that
the data is “Unfit”. At this point either repeat the data acquisition, or try to manually
condition or edit the data using the edit data function. This built-in check helps
alert you to a problem with the reliability of the colleted data.. Refer to the Display
Sine Fit section on page 3-168 for more information.
Note
Remember, when shaft movement is due to factors other than mis-
alignment measured, this will appear as randomness (noise) in the
data. This is not normally a problem when the misalignment is great,
but will increasingly interfere as the misalignment decreases. There-
fore, the better the alignment the more likely the chance will be of
getting an unfit data warning.
If you do encounter a machine where this becomes a problem too great to over-
come (for example an unfit sine curve or the presence of too much background
vibration), consider switching to an alternative method such as Auto 4 Point. Refer
to the Sweep Mode Curve Data section on page 3-126 and Data Quality section on
page 3-127 for more information.
Auto 4 Point
If Auto 4 Point has been defined as the laser alignment method for the job, data is
acquired at the traditional cardinal positions (0°, 90°, 180°, and 270°). In this
method, the laser head’s built-in inclinometers are used while the shaft is rotated,
but data is automatically acquired and stored in the Laser Align program instead of
in the laser heads.
Note
Both laser heads need to be turned on for this option to function
properly.
When setting the job up to use Auto 4 Point as the Laser Align Method for
acquiring data, you must also set the sample rate. The sample rate determines the
number of data samples that are to be collected and averaged together to produce
a single Laser PSD reading.