Fluke 810 User Manual page 144

810
Users Manual
You need to take at least one measurement
from each component in the drive train for
proper diagnosis. If a component is not tested
(except belts and couplings), the Tester cannot
diagnose the untested component.
9. When should I use the tachometer?
Using a tachometer is highly recommended for
Variable Frequency Drives (VFDs) DC Motors
and when RPM data is unavailable for regular
drives. Reflective tape placed on the rotating
equipment is required in order to capture
readings with the tachometer.
10. What should I do when the Tester gives an
accelerometer overload error?
Accelerometer overload is a common diagnostic
system error. Usually a temperature transient or
a loose sensor mounting can cause this error.
To isolate the problem, first eliminate bad cables
and improper sensor mountings. If the problem
is still not resolved after eliminating these issues,
please contact your Fluke service center.
FAQs - Diagnosis
1. How does the Tester diagnose the problems
and how accurate are the diagnoses?
Once the setup and measurement information is
collected, the onboard diagnostic system
A-6
analyzes the data using a set of powerful
algorithms. Using a database of similar
machines with no known faults, the diagnostic
system compares the tested machine's setup
and newly acquired vibration data to similar
machines in the database.
Diagnostic quality is largely based upon the
quality and quantity of the machine setup and
data provided to the Tester. Proper component
descriptions coupled with proper sensor
placement and orientation, accurate running
speed measurements and answering all optional
questions in the machine setup will contribute to
higher confidence in the final diagnosis. While
accuracy can be provided for the Tester's ability
to collect data (see Electrical Specifications),
many variables come into play to define a
reliable accuracy specification for the Tester's
diagnostic capability. However, in independent
testing, the diagnostic capability of the Tester is
similar to that of an experienced vibration
analyst.
The diagnoses are based on experience with
similar machines. The Tester is part of an overall
decision-making process and should be used
alongside good judgment and knowledge of the
specific machine tested before taking specific
repair actions.