- Joined
- Nov 25, 2016
- Messages
- 175
Thank you Clock work for your reply. 8.5 A is right on the money for 3 HP motor. Your motor is most likely of TEFC (totally enclosed fan cooled) design. Still the question stands - do I have a 3 HP motor or not? Also what is the correct FLA for my motor?
That was the term. Thank you. You're welcome and apologies that I wasn't able to answer your question... I tried to give you a path to dig beyond forums. I'm pretty down on forums (and YT and other hyper-diluted internet-based fountains of trustable information and known best methods. I'm so far beyond the fact-gathering stage for my VFD design that I can't provide any useful details other than... I have a clear recollection of not being able to nail down everything I was looking for, and I had to triangulate in to an improved estimate rather than a nailed down fact.
I thought I had a pile of fairly decent industry/practitioner-grade app notes on electric motors and standards but I'm not finding those at the moment. If the plate is suspect, you either have to establish its correctness via an alternative method or swap motors. I'll say this... they come off easy and that'd be what I insist upon if there were not a *guaranteed* alternative method to which all parties agree. You didn't create the situation so you get the final veto IMO. Can you ascertain anything from the wire gage/stranding/marking? I can think up an experimental way to get there but I don't you can just do V*I*eff because eff comes off the plate and the plate is suspect. You'd have to measure power out. Doable.. PITA. Is there a SN stamped on the case rather than the plate and if so can you work anything back from that? If the plate is actually right, you have the wrong motor. If the plate is not right or might not be, you have uncertainty that is hard to eliminate conclusively. Sorry I can't be more than useless. Tough situation. Good luck.