Go to NEMA.org and download their free paper on AC Adjustable Frequency drives. It does require registration (I used a disposable email address), but it's free.
http://www.nema.org/stds/acadjustable.cfm
I did use it during the exam, and it did have the answer.
I think they have the Speed Regulation Formula wrong. They are mixing between Speed Regulation formula and Slip formula. take a look at section 6.3.5.2 "Speed Regulation".No, the NEMA document is like 80 pages long. That document you reference is a little of the info, but there's a lot more in there.
Go to NEMA.org and download their free paper on AC Adjustable Frequency drives. It does require registration (I used a disposable email address), but it's free.
http://www.nema.org/stds/acadjustable.cfm
I did use it during the exam, and it did have the answer.
CableGuy, do you think the entire section 5 is enough for VFD questions on the exam?.I won't point to the page (too specific ), but section 5.3 (7 pages) had some good information in it. If you can remember the question, you'll spot the answer while reading.
But I doubt they'll ask the same question again.
But I'd seriously at least skim that whole document, it does give a really good overview of VFDs, plus the table of contents is well laid out and could be helpful.
Enter your email address to join: