Application Note

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Application Note

From the Fluke Digital Library @ www.fluke.com/library

What is a nonstandard

fault?

With proper setup and data

collection, the Fluke 810 Vibra-

tion Tester can detect, locate,

and assess the severity of four

standard mechanical conditions,

or faults: bearing condition,

misalignment, imbalance, and

looseness. These standard faults

cause most of the mechanical

problems in equipment with

rotating parts at a typical manu-

facturing or commercial facility.

Under certain conditions, how-

ever, the Fluke 810 may identify

a nonstandard fault.

A nonstandard fault diagnosis

is usually caused by one of three

conditions:

1. Incorrect or incomplete

machine setup. Information

about drivetrain components

was not completely or accu-

rately entered during setup of

the Fluke 810.

2. Incorrect or insufficient

data collection. The run-

ning speed of the machine

under test was not accurately

entered and/or the minimum

data collection requirements

were not met.

3. Vibration condition other

than one of the four stan-

dard faults. One or more

other faults (mechanical and/

or electrical) are affecting

Is it really a nonstandard fault, or

is it just the setup? Find out how to

tell the difference and how to fix

common setup issues.

The onboard diagnostic engine of the Fluke 810

Vibration Tester relies on correct setup and data

collection to deliver an accurate diagnosis.

How to Deal with a

Nonstandard Fault Diagnosis

from the Fluke 810 Vibration Tester

the equipment’s vibration

signature. The Fluke 810

recognizes these readings and

diagnoses them as nonstan-

dard faults. (See the sidebar

Nonstandard Faults for the

Fluke 810 Vibration Tester for

a list of possible nonstandard

fault conditions.)

What should you do if

you get a nonstandard

fault diagnosis?

If confronted with a nonstan-

dard fault diagnosis during a

normal testing procedure, take

the measurements again and see

if you get a second nonstandard

fault diagnosis. If you don’t, the

diagnosis was probably caused

by an isolated vibration event

or a data collection error. If you

do get another nonstandard

fault diagnosis, take the follow-

ing steps to eliminate the most

probable causes:

1. Double-check the machine

setup in the Fluke 810.

• Has all of the required

information about the

driver, transmission, and

driven component been

entered?

• Are the component types

correctly described in the

setup? For example, was

an ac motor improperly

described as dc? Was a

screw compressor entered

as a piston compressor?

Summary of content (2 pages)

PAGE 1
How to Deal with a Nonstandard Fault Diagnosis from the Fluke 810 Vibration Tester Application Note Is it really a nonstandard fault, or is it just the setup? Find out how to tell the difference and how to fix common setup issues. The onboard diagnostic engine of the Fluke 810 Vibration Tester relies on correct setup and data collection to deliver an accurate diagnosis.
PAGE 2
. Ensure that the data quality and quantity are sufficient for accurate diagnosis. • Are measurements being taken from all of the identified components (driver, transmission, driven component) in the machine’s setup? For example, if a drivetrain is set up to include a motor, gearbox, and pump, and only data from the motor and pump is collected, the Fluke 810’s diagnostic engine may misdiagnose the problem because it does not have all of the required information.