FLA vs SFA
FLA vs SFA
(OP)
on a (for example) 2HP 3phase 208-230/460v motor data sheet, it has 'none' listed under the SFA, would it be because they didn't test for it, or it's the same as the FLA? I can't imagine why they wouldn't list it. I couldn't get an acceptable answer out of the reps I deal with, and would rather get your opinions anyways.





RE: FLA vs SFA
RE: FLA vs SFA
RE: FLA vs SFA
From the Cowern Papers on the Baldor Motor site
http://www.baldor.com/pdf/literature/PR2525.pdf
respectfully
RE: FLA vs SFA
Service factor is supposed to be a temporary overload capability. Many motor manufacturers are reluctant to put SFA as a separate parameter on the nameplate because users have interpreted that as an endorsement of running a motor into the SF on a continual basis.
RE: FLA vs SFA
RE: FLA vs SFA
RE: FLA vs SFA
The current at SF load is related to the efficiency(EFF), power factor(PF) and line voltage(Vll). Note that EFF and PF change with every change of load. Then:
SFA = SF*HP/[SQRT(3)*Vll*EFF*PF]
For exact calculation of current, the EFF and PF curves vs Load for the specific motor are required.
RE: FLA vs SFA
(Thanks ILCML actually i was about a start a thread for a same kind of query regarding relation between SFA & SF%)
RE: FLA vs SFA