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- May 16, 2016
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15a is roughly about 2hp equivalent consumption of the single phase line @230v
Mike are you sure that it's about 2HP. I would have thought it would be closer to 4HP. unless it has a very poor power factor.
15a is roughly about 2hp equivalent consumption of the single phase line @230v
the draw is slightly greater than 2hp on the single phase input, a 3hp single phase motor would draw around 17a full load currentMike are you sure that it's about 2HP. I would have thought it would be closer to 4HP. unless it has a very poor power factor.
the draw is slightly greater than 2hp on the single phase input, a 3hp single phase motor would draw around 17a full load current
full load current for a 3 phase 10 hp motor running on 3 phase 230v, is about 28 amps
That might not be energy that you're paying the power company for; there's a phase-angle correction,
which you can check. Turn off electric water heater and furnace/AC, look at five minutes of
power-company-meter reading with the RPC running, then turn it off and look at another five minutes.
Some of the current you're measuring is due to the start/run capacitors in the RPC, and doesn't
mean real electric power. The power meter indicates this, but ammeter measurements don't.
OK you had me a little confused, you said 15A on one leg and 14A on another, I assumed you were referring to phase leads, so am I to assume you are referring to the single phase active and neutral leads,if so they should read the same. I still think it's rather high although Ulma doctor says it's about right. And I suspect he knows more about it than I do. It will be interesting to see how much it draws when running a good 3 phase load.
As for running the RPC outside or in any out of the way place, you could wire up a lamp that will show when the RPC is powered on. A mate of mine did that with his shop compressor, he had a green light next to the remote on off switch.
Interesting, Whitmore. I'll do that. I just figured that if my ammeter shows 15 amps, then that's what I'm paying the power company for.
Thank you, Bobshobby. I'm using a clamp-type ammeter, clamping it around one input lead to the phase converter motor and then the other. It does seem strange that they're not reading the same current. All current going into the motor should also be going out, shouldn't it? But indeed, one leg consistently reads 14 amps while the other reads 15.
No worries mate!
We have 240v single phase and 208 or 230v 3 phase as well as 440/460v 3 phase
I have wired up a few machines that came from down under to run on our supply
The machines come in with 415v 5 wire plugs
I omit the blue neutral and i convert the control systems. the remaining 4 wires do the work with 208-230v 3 phase supply to the machine.
The conversions are battle tested and have served many well
All the best
Hi Bob,Glad you know what you are doing, electricity was not my best subject when I studied marine engineering, sure I get the basics of generation and distribution, even fault finding and repair on a known system, but when it comes to wiring up motors onto a system that is different from their name plate, I'm well out of my depth. BTW your 5 wire 3ph plug woud have been L1, L2, L3, N and E. If you leave the blue out that is the N does that mean you are usinhg the E (yellow/ green or just green on older stuff ) as your N. Are you wiring star (WYE) or Delta?