Application Note

ManualsBrandsFluke ManualsPower Supply1744

Figur

e 1.

This maintenanc

e control chart tracking voltage unbalance shows a Nov-03 reading above the 2.5 %

limit and then the effect of the corrective action.

Application Note

Applying power quality

measurements to

predictive maintenance

You may already be using pre-

dictive maintenance (PdM)

techniques on your motors and

drives. But how often do you

inspect the power to your equip

ment? By adding basic power

quality measurements to produc

tion equipment maintenanc

procedures you can head off

unexpected failures in both

production equipment and your

power system.

Cost savings

Insurance claims data in the

NFPA 70B maintenance standard

shows that roughly half of the

cost associated with electrical

failures could be prevented by

regular maintenance. A study

published in IEEE 493-1997 says

that a poorly maintained system

can attribute 49 % of its failures

to lack of maintenance.

To determine the cost of a

failure, it helps to consider three

key categories:

•

ost inc

ome (g

ross marg

in)

due to dow

ntime

•

Cost of labor to troubleshoot,

patch, clean up, repair and

restart

•

Cost of damaged equipment

and materials, including

repairs, replac

ements and

scrapped material

To calculate power quality

costs and potential savings

at your facility, reference the

online calculator at

www.fluke.com/pqcalculator.

PART FOUR

of a predictive

maintenance series

For more information on Fluke Predictive

Maintenance Products and Services go to

www.fluke.com/pdm

Summary of content (3 pages)

PAGE 1
PART FOUR of a predictive maintenance series Applying power quality measurements to predictive maintenance Application Note You may already be using predictive maintenance (PdM) techniques on your motors and drives. But how often do you inspect the power to your equipment? By adding basic power quality measurements to production equipment maintenance procedures you can head off unexpected failures in both production equipment and your power system.
PAGE 2
Voltage stability, harmonic Integrating power quality distortion, and unbalance are into PdM Unlike a comprehensive electrical system survey, predictive maintenance power quality focuses on a small set of measurements that can predict power distribution or critical load failures. By checking the power quality at critical loads, you see the effect of the electrical system up to the load.
PAGE 3
Voltage sag count Taking a single voltage reading tells only part of the story. How is the voltage changing during an hour? During a day? Sags, swells and transients are short-term variations in voltage. The voltage sag (or dip) is the most common and troublesome variety. Sags indicate that a system is having trouble responding to load requirements and significant sags can interrupt production.