Inrush current deruction
Inrush current deruction
(OP)
I need to install a soft-start on a 200HP, 460v, 226 FLA motor. My question is, what would a 30% voltage reduction do to the inrush current? It would reduce it by how much? Thanks!
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Inrush current deruction
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Inrush current deructionInrush current deruction(OP)
I need to install a soft-start on a 200HP, 460v, 226 FLA motor. My question is, what would a 30% voltage reduction do to the inrush current? It would reduce it by how much? Thanks!
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RE: Inrush current deruction
Gunnar Englund
www.gke.org
RE: Inrush current deruction
RE: Inrush current deruction
"Inrush current" is technically the magnetization current when power is first applied to the windings, and can be anywhere from 800 - 2000% FLA for 1 cycle or less. You probably meant "Starting current", which is also defined as Locked Rotor Current (Locked Rotor Amps). LRC/LRA is typically 500-600% of FLA, but is specifically determined by the NEMA Locked Rotor kVA Code letter for any particular motor design.
Eng-Tips: Help for your job, not for your homework Read FAQ731-376
RE: Inrush current deruction
RE: Inrush current deruction
http://www.lmphotonics.com/busbarexe.htm
Other than that, I use SKM, others here use ETAP, both of which would set you back $5K or more if you wanted definitive proof of success before you buy a starter.
Eng-Tips: Help for your job, not for your homework Read FAQ731-376
RE: Inrush current deruction
RE: Inrush current deruction
RE: Inrush current deruction
Then again, it could be 20 seconds or more, could require 400% or 450% CL, or may not start at all if your power source is too weak or the transformer is too small or the head is too high or the distance to the motor is too long or the motor is undersized etc. etc. etc. It's kind of like asking "can I drive from San Francisco to Los Angeles on one tank of gas?" without saying what kind of car, how many passengers, which road, how fast, wind conditions, etc.
Eng-Tips: Help for your job, not for your homework Read FAQ731-376