Page 22 - 810 Trianing Book Extract

C Hints and tricks for the expert: How to get more

from the tester

What is an automated vibration tester and how is it different from a vibration analyzer?

The tester starts as a 4-channel vibration data collector, but then many features and functions are modiied to

make it easy to use by a technician with minimal training and experience. An experienced vibration analyst may
feel that they need these functions but 30 years of real world experience has proven that advanced troubleshoot-
ing techniques are not needed to diagnose the most common faults in most rotating machines. Instead of starting

with the most complex problems, irst ind the easy and most common problems. After the easy problems are elim-
inated, then look at the complex problems. Fluke diagnostic software was developed by expert vibration analysts.

SETUP

How does the tester select the machine test parameter settings?

With a vibration analyzer, an experienced analyst would select each machine test manually, based on knowledge

gained over many years. The settings are NOT user-deined in the vibration tester because the typical user is not
an experienced vibration expert. A team of vibration experts have validated that most machines could be setup
the same way and these default settings are designed into the vibration tester. This means that the user does

not have to be an expert because experts have already selected the parameters to optimize each machine test. In
igure 89 are the default settings for the tester. (Note: the terms below are typically covered in detail in a Level 1
vibration certiication training course.)

Frequency span: automatically selected by multiplying 1X shaft speed by 10 for low range and by 100 for
high range. The same frequency span (low range, high range) is used on each bearing location across the entire

machine train which makes it very easy to compare data between the motor and the other components (gearbox,
pump, fan, compressor, etc.).

Motor data Location 2 Pump data Location 3

(0-100 X Shaft speed) (0-10 X Shaft speed)
(0-100 X Shaft speed) (0-10 X Shaft speed)

Figure 89

142 Section 2: Vibration tester training manual