There have been cases reported where bearings have been damaged by AC drives due to bearing currents. Some of these cases are true, but most are tales that have emerged because no one bothered to investigate the…
A colleague of mine read my previous blog post on product reliability. And, while there’s nothing wrong with what I wrote, he did send me lots of material on more modern approaches to determining product robustness, rather…
In several discussions that I had with customers over the years, the topic of expected lifetime has come up. The concern for a product’s reliability as expressed by Lifetime is a natural part of the evaluation. Lifetime…
When applying variable speed control to deepwell submersible pumps, there are some unique concerns that need to be taken into consideration due to the mechanical design of the pump. One of these concerns is how to protect…
There is a lot of discussion in the pumping industry about the reliability of sensorless pump control. While controlling pumps through indirect measurements has been available to the market for many years in a variable frequency drives,…
At almost any water or wastewater plant you will see installations where there are several pumps installed outdoors. In the past, managing an electrical installation was simple; all you needed was protection of the mains cable to…
