CRL 1-hr: Nov 7 Introduction to Uptime Elements Reliability Framework and Asset Management System

A high resistance or resistance unbalance in the circuit may be an indication of a high resistance connection. Figure 8-3 illustrates for just one type, a bolted connection, some of the possible causes.

Figure 8-3 - Possible Causes of Resistance Unbalance in a Motor Circuit

Areas of concern in a bolted connection are:

  • Properly sized lugs
  • Proper crimping of the lugs used
  • Clean contact area on the wire; buff area if needed
  • Properly sized bolts
  • Proper torque applied to the bolts
  • No nicks in wire where insulation has been removed
  • No corrosion of cables where crimping is to take place.

Severe damage can occur, all due to high resistance connections. If not dealt with quickly, they can generate a lot of heat, with the resultant damage not evident because it occurs in closed connection boxes. This can be revealed by periodic monitoring of circuit resistance in the conductor path, a measurement rarely done prior to introduction of motor circuit analysis as it is done with modern testers today. Corrective action should be taken when trends in resistance or unbalance percentage approach or exceed alert or alarm guidelines.

Tip from Motor Electrical Predictive Maintenance & Testing Vol. 3: Technologies for Motor Electrical Predictive Condition Monitoring by Jack Nicholas & Geoffery Generalovic.

About this title

Describes seven technologies for motor electrical predictive condition monitoring, almost all of which have been developed and applied since about 1990. A chapter is devoted to using up to 15 predictive technologies to help refine condition assessments, since no single technology can detect all failure modes in motors.

Available now on Amazon

Upcoming Events

August 8 - August 10, 2023

Maximo World 2023

View all Events
banner
80% of Reliabilityweb.com newsletter subscribers report finding something used to improve their jobs on a regular basis.
Subscribers get exclusive content. Just released...MRO Best Practices Special Report - a $399 value!
DOWNLOAD NOW
IMC-2022 Who's Who: The World's Best Run Companies

The International Maintenance Conference (IMC) provides a fresh, positive community-based curated experience to gain knowledge and a positive perspective for advancing reliability and asset management through people, their managers, the strategy, the processes, the data and the technology.

Uptime Elements Root Cause Analysis

Root Cause Analysis is a problem solving method. Professionals who are competent in Root Cause Analysis for problem solving are in high demand.

Reliability Risk Meter

The asset is not concerned with the management decision. The asset responds to physics

Why Reliability Leadership?

If you do not manage reliability culture, it manages you, and you may not even be aware of the extent to which this is happening!

Asset Condition Management versus Asset Health Index

Confusion abounds in language. Have you thought through the constraints of using the language of Asset Health?

Seven Chakras of Asset Management by Terrence O'Hanlon

The seven major asset management chakras run cross-functionally from the specification and design of assets through the asset lifecycle to the decommissioning and disposal of the asset connected through technology

Reliability Leader Fluid Cleanliness Pledge

Fluid Cleanliness is a Reliability Achievement Strategy as well as an asset life extension strategy

MaximoWorld 2022 Conference Austin Texas

Connect with leading maintenance professionals, reliability leaders and asset managers from the world's best-run companies who are driving digital reinvention.

“Steel-ing” Reliability in Alabama

A joint venture between two of the world’s largest steel companies inspired innovative approaches to maintenance reliability that incorporate the tools, technology and techniques of today. This article takes you on their journey.

Three Things You Need to Know About Capital Project Prioritization

“Why do you think these two projects rank so much higher in this method than the first method?” the facilitator asked the director of reliability.