Fluke 810 Application Note Wavin Industrial Bus Problems

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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?

2 Fluke Corporation How to Deal with a Nonstandard Fault Diagnosis from the Fluke 810 Vibration Tester

Nonstandard Faults for the

Fluke 810 Vibration Tester

Four standard faults—bearing condition, misalign-

ment, imbalance, and looseness—cause most of the

mechanical problems in equipment with rotating parts.

If the Fluke 810 Vibration Tester gives a nonstandard

fault diagnosis after you have verified correct setup,

consider these other fault conditions.

Electrical

• Electrical switching fault in a variable

frequency drive

• Motor component (stator, winding,

commutator, brush) problems

• Motor lamination looseness

• Motor air gap problem

• Line phase voltage imbalance

Non-bearing mechanical element

wear or defect

• Pump component (vane, timing gear,

impeller, piston, idler shaft, rotor)

wear or clearance problems

• Motor cooling fan blade damage

• Gearbox input shaft pinion problem

• First gear mesh problem or wear

• Fan wheel wobble

• Fan dirt buildup or blade clearance

problem

• Sheave problems

• Drive belt irregularity

• Coupling wear

• Compressor component (rotor thread ,

piston/valve, impeller, lobe) wear

Flow related

• Pump cavitation or air ingestion

• Fan air flow disturbance

• Compressor gas pulsation

Structural

• Structural vibration or resonance

• Motor or pump mounting flexibility

• Motor foundation flexibility or

resonance

• Foundation weakness or resonance

• Foundation vibration

• Fan mounting transverse flexibility

Other

• Overloaded accelerometer

• Oil whirl

• Oil whip

2. Ensure that the data quality

and quantity are sufficient

for accurate diagnosis.

• Are measurements being

taken from all of the identi-

fied components (driver,

transmission, driven com-

ponent) 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 informa-

tion. A good rule of thumb

is never to set up or test

partial drivetrains.

• If only a motor is being

tested, was this indicated

in the setup? If so, ensure

that the motor is uncou-

pled from the rest of the

drivetrain prior to testing

to minimize or eliminate

transient vibrations.

Fluke Corporation

PO Box 9090, Everett, WA 98206 U.S.A.

Fluke Europe B.V.

PO Box 1186, 5602 BD

Eindhoven, The Netherlands

For more information call:

In the U.S.A. (800) 443-5853 or

Fax (425) 446-5116

In Europe/M-East/Africa +31 (0) 40 2675 200 or

Fax +31 (0) 40 2675 222

In Canada (800)-36-FLUKE or

Fax (905) 890-6866

From other countries +1 (425) 446-5500 or

Fax +1 (425) 446-5116

Web access: http://www.fluke.com

©2011 Fluke Corporation.

Specifications subject to change without notice.

Printed in U.S.A. 3/2011 4002200A A-EN-N

Modification of this document is not permitted

without written permission from Fluke Corporation.

Fluke. Keeping your world

up and running.®

• Was vibration data col-

lected with the sensor from

a minimum of one location

for each identified com-

ponent? Did the sensor’s

location and orientation

on the components match

those in the setup diagram

in the Fluke 810?

• Were the best test loca-

tions used for the data

collection? The training

DVD and quick reference

guide provided with the

Fluke 810 provide guid-

ance in identifying these

test points.

In summary, the onboard diag-

nostic engine of the Fluke 810

relies on accurate setup and

data collection to deliver an

accurate diagnosis. We rec-

ommend reviewing the setup

data to ensure that all of the

information provided during

the machine setup was correct.

Guesses or estimates about the

setup can give misleading or

incorrect diagnoses. Next, make

sure that a sufficient number

of measurements were taken

from the recommended test

points. If possible, repeat the

measurements.

If, after ensuring that setup

and measurement steps have

been completed as suggested,

a nonstandard fault is still

diagnosed, other electrical and

mechanical problems outside of

the basic four standard faults

may be occurring. If this is the

case, you may want to consult

the machinery’s documentation,

the manufacturer, or a vibra-

tion specialist. See the sidebar

“Nonstandard Faults for the

Fluke 810 Vibration Tester” for a

list of possible nonstandard fault

conditions.

Under certain conditions, the Fluke 810 Vibration Tester may identify

a “nonstandard fault.”