Efficient Plant October 2017 - 38

feature | equipment reliability

Motor imbalance can never be completely
eliminated, but can be identified and rectified.
motor imbalance can never be
completely eliminated, personnel can identify when it is out
of normal range and rectify
the problem.
Criticality: High
9. Shaft looseness. Looseness
occurs when there is excessive
clearance between parts, and it can
show up in several places: Rotating
looseness is caused by excessive clearance
between rotating and stationary elements of the
machine, such as in a bearing. Non-rotating
looseness occurs between two normally stationary
parts, such as a foot and a foundation, or between
a bearing housing and a machine. Note: As with
other sources of vibration, it's important to know
how to identify looseness and resolve the issue.
Criticality: High
10. Bearing wear. A failed bearing has increased drag,
emits more heat, and has lower efficiency. Regardless of the cause, once bearing failure begins,
it creates a cascade effect that accelerates motor
failure. Note: Bearing failure causes 13% of motor
failures and bearing wear causes more than 60% of
the mechanical failures in a facility.
Criticality: High

LEARN MORE
For more details on

each of these 13 caus-

es and their impact, as
well as information on
tools and strategies
for detecting such

problems in advance,
download Fluke's

entire "Application

Note" at bit.ly/2ft1Sj9

and/or visit fluke.com.

38

IMPROPER INSTALLATION FACTORS

11. Soft foot. The term "soft foot" refers to a condition
in which the mounting feet of a motor or driven
component are not even, or the mounting surface
upon which the mounting feet sit is not even. This
can create a frustrating situation in which the act
of tightening mounting bolts on a machine's feet
introduces new strains and misalignment. Soft
foot is often manifested between two diagonally
positioned mounting bolts, similar to the way that

| EFFICIENTPLANTMAG.COM

an uneven chair or table tends to rock in a diagonal
direction. Note: Be it parallel or angular in nature,
soft foot must be remedied before proper shaft
alignment can be achieved.
Criticality: Medium
12. Pipe strain. The term pipe strain refers to the
condition in which new stresses, strains, and
forces, acting on the rest of the equipment and
infrastructure, transfer backward onto the motor
and drive to induce a misalignment condition.
The most common example of this is in simple
motor/pump combinations, where the pipework is
subjected to some type of force, i.e., a foundation
shift; a newly installed valve or other component;
an object striking, bending, or pressing on a pipe;
or broken, inadequate, or missing pipe hangers
or wall-mounting hardware. These situations can
cause the motor/pump shaft to be misaligned.
Note: It's important to check machine alignment
more than just at the time of installation. Precision alignment is a temporary condition that can
change over time.
Criticality: Low
13. Shaft voltage. When motor shaft voltages exceed
the insulating capability of the bearing grease,
flashover currents to the outer bearing will occur.
These currents will cause pitting and grooving in
the bearing races. The first signs of this problem
will be noise and overheating as the bearings begin
to lose their original shape and shed metal fragments that mix with the grease and increase friction. This can lead to bearing destruction within a
few months of motor operation. Measuring shaft
voltage and bearing current is an important step
in preventing this type of situation. Note: Shaft
voltage is only present while a motor is energized
and rotating.
Criticality: High EP

OCTOBER 2017


http://www.bit.ly/2ft1Sj9 http://www.fluke.com http://www.EFFICIENTPLANTMAG.COM

Table of Contents for the Digital Edition of Efficient Plant October 2017

Editorial
Implementations
Profitable Reliability Control On Your Horizon
Experts Provide IIoT Insights
Integrating Automation Into Shade Manufacturing
Fluid-Flow Challenges
Looking For Failure In All The Wrong Places
Closer Human/Robot Collaboration
Note These Causes Of Motor Failure
Reliable Pumping Supplement: Food & Beverage Processing
On The Floor
Uptime
IIoT
Pump 'Cavitation' Might Not Be
Never Too Late For Basic Navigation
Audit or Assess? Understand The Difference
A Perfect Pair: Barcodes and Your CMMS
Lubrication Strategies
Products
Ad Index
Showcase
Efficiency Insight
Efficient Plant October 2017 - 1
Efficient Plant October 2017 - Cover1
Efficient Plant October 2017 - Cover2
Efficient Plant October 2017 - 1
Efficient Plant October 2017 - 2
Efficient Plant October 2017 - 3
Efficient Plant October 2017 - 4
Efficient Plant October 2017 - 5
Efficient Plant October 2017 - 6
Efficient Plant October 2017 - 7
Efficient Plant October 2017 - Editorial
Efficient Plant October 2017 - 9
Efficient Plant October 2017 - Implementations
Efficient Plant October 2017 - 11
Efficient Plant October 2017 - Profitable Reliability Control On Your Horizon
Efficient Plant October 2017 - 13
Efficient Plant October 2017 - 14
Efficient Plant October 2017 - 15
Efficient Plant October 2017 - Experts Provide IIoT Insights
Efficient Plant October 2017 - Integrating Automation Into Shade Manufacturing
Efficient Plant October 2017 - 21
Efficient Plant October 2017 - 22
Efficient Plant October 2017 - 23
Efficient Plant October 2017 - 17
Efficient Plant October 2017 - 18
Efficient Plant October 2017 - 19
Efficient Plant October 2017 - Integrating Automation Into Shade Manufacturing
Efficient Plant October 2017 - 21
Efficient Plant October 2017 - 22
Efficient Plant October 2017 - 23
Efficient Plant October 2017 - 24
Efficient Plant October 2017 - Fluid-Flow Challenges
Efficient Plant October 2017 - 26
Efficient Plant October 2017 - 27
Efficient Plant October 2017 - 28
Efficient Plant October 2017 - Looking For Failure In All The Wrong Places
Efficient Plant October 2017 - 30
Efficient Plant October 2017 - 31
Efficient Plant October 2017 - 32
Efficient Plant October 2017 - 33
Efficient Plant October 2017 - Closer Human/Robot Collaboration
Efficient Plant October 2017 - 35
Efficient Plant October 2017 - Note These Causes Of Motor Failure
Efficient Plant October 2017 - 37
Efficient Plant October 2017 - 38
Efficient Plant October 2017 - Reliable Pumping Supplement: Food & Beverage Processing
Efficient Plant October 2017 - 40
Efficient Plant October 2017 - 41
Efficient Plant October 2017 - 42
Efficient Plant October 2017 - 43
Efficient Plant October 2017 - 44
Efficient Plant October 2017 - 45
Efficient Plant October 2017 - 46
Efficient Plant October 2017 - On The Floor
Efficient Plant October 2017 - 48
Efficient Plant October 2017 - Uptime
Efficient Plant October 2017 - IIoT
Efficient Plant October 2017 - Pump 'Cavitation' Might Not Be
Efficient Plant October 2017 - Never Too Late For Basic Navigation
Efficient Plant October 2017 - Audit or Assess? Understand The Difference
Efficient Plant October 2017 - A Perfect Pair: Barcodes and Your CMMS
Efficient Plant October 2017 - Lubrication Strategies
Efficient Plant October 2017 - 56
Efficient Plant October 2017 - 57
Efficient Plant October 2017 - 58
Efficient Plant October 2017 - 59
Efficient Plant October 2017 - Products
Efficient Plant October 2017 - 61
Efficient Plant October 2017 - Ad Index
Efficient Plant October 2017 - Showcase
Efficient Plant October 2017 - Efficiency Insight
Efficient Plant October 2017 - Cover3
Efficient Plant October 2017 - Cover4
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