All,
Just wondering where things are trending, what are the most popular frequency drives these days? Is there a certain manufacturer to avoid? or a certain model that stands out as bulletproof?

Looking for some opinions on freq drives based on experience. thanks!

Alright, here's a question for those maintenance tech who dabble with PLC's for troubleshooting equipment...

What is the most maintenance friendly PLC?

I have some experience with the Allen Bradly line. I've used RSlogix 500 and 5000, so I like Allen Bradley PLC's for troubleshooting. What I'm looking for is some input from someone who has used different brands of PLC's for troubleshooting equipment. Are there more maintenance-friendly PLC's on the market?

What do you guys think?

Folks,
I have an industrial computer that shuts down immediately with battery backup. I installed an APC UPS on the computer to protect it from some recent brownouts, but it didn't work. I contacted my IT department and they gave me a different battery backup. When this one didn't work, we tried another brand all together but the computer still shuts down as soon as it moves to battery power.

This happens without even loading the power management software that comes with the UPS battery backup. So far I have tried an APC, a Tripp-Lite, and a Compu-power brand. Three entirely different units with the same result.

Has anyone ever seen this?

Hello guys,
I have a question regarding 480V contactor coils. I understand that wiring a control circuit with 480V is not acceptable for safety reasons, but there is the grandfather situation that I am confused with.

Are old 480V contactor coils grandfathered in? I need to replace a 480V coil (15D21G4) and I don't know if I have to rewire the controls or can I just buy another 480V coil.

Let me know your thoughts or if anyone knows that it definitely not an accepted practice to still use the 480V coils.

Thank you!