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Posted: 9/27/2016 9:01:52 PM EDT
Brother bought a new IR air compressor. Single phase 230V with 3 wires. He is trying to plug it in to a Honda generator with a NEMA L14-30 plug. He has the correct male plug and was wondering what wires went where. Compressor power lead wire colors are Black, White and green. I am assuming black and white are the hot wires, and correspond with the left and right holes in the outlet, that leave the green wire, does it go to the L shaped locking hole on top or the bottom one? I can get more info if needed.
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Posted: 9/27/2016 9:11:08 PM EDT
[#1]
Yes on the 240V outlet the L shaped prong is ground. The others are the 2 legs.
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Posted: 9/27/2016 9:11:15 PM EDT
[#2]
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Posted: 9/27/2016 9:14:05 PM EDT
[#3]
How many horse? If 5 hp I don't think the gen can do it.
I'd use a tester to figure wiring. |
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Posted: 9/27/2016 9:15:36 PM EDT
[#4]
The L shaped one is the ground.
Directly across from it is the neutral. The 2 sides are the hots. Assuming you are sure it's a 230v motor, The black and white are hot. Green ground. That isn't that big of a generator, compressors use ALOT of power to start. BTW this is one of them questions that if you have to ask, you shouldn't be doing this. |
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Posted: 9/27/2016 9:26:47 PM EDT
[#5]
Quote HistoryQuoted:
The L shaped one is the ground. Directly across from it is the neutral. The 2 sides are the hots. Assuming you are sure it's a 230v motor, The black and white are hot. Green ground. That isn't that big of a generator, compressors use ALOT of power to start. BTW this is one of them questions that if you have to ask, you shouldn't be doing this. I'm not doing it, but I did some searching of the generator manual online, and had him send me the tag on the compressor motor so I know its a 230v 1 phase motor. I also think that the generator is undersized but he wants to try it. Is there a chance of damage besides tripping a breaker if the compressor is too big? Electricity is something I try to stay away from unless I have to, but I am better at reading and research than my dad and brother so they referred to me on this. I told them to have it hard wired in under the house. Max amperage of motor is 21. Honda Rates the generator for 20.8Amps 500KW max(30min run time), 18AMP 4500KW continuous, with the ability to do 29.1AMP 7000KW for a 10 second surge to "start heavier equipment". |
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Posted: 9/27/2016 9:39:02 PM EDT
[#6]
What got confusing when I was researching diagrams for them is the terms "ground" and "neutral ground" showed up in the same diagrams for the plugs. Its not my equipment so I don't want to just wing it and steer them wrong.
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Posted: 9/27/2016 9:41:11 PM EDT
[#7]
Quote HistoryQuoted:
I'm not doing it, but I did some searching of the generator manual online, and had him send me the tag on the compressor motor so I know its a 230v 1 phase motor. I also think that the generator is undersized but he wants to try it. Is there a chance of damage besides tripping a breaker if the compressor is too big? Electricity is something I try to stay away from unless I have to, but I am better at reading and research than my dad and brother so they referred to me on this. I told them to have it hard wired in under the house. Max amperage of motor is 21. Honda Rates the generator for 20.8Amps 500KW max(30min run time), 18AMP 4500KW continuous, with the ability to do 29.1AMP 7000KW for a 10 second surge to "start heavier equipment". Quote HistoryQuoted:
Quoted:
The L shaped one is the ground. Directly across from it is the neutral. The 2 sides are the hots. Assuming you are sure it's a 230v motor, The black and white are hot. Green ground. That isn't that big of a generator, compressors use ALOT of power to start. BTW this is one of them questions that if you have to ask, you shouldn't be doing this. I'm not doing it, but I did some searching of the generator manual online, and had him send me the tag on the compressor motor so I know its a 230v 1 phase motor. I also think that the generator is undersized but he wants to try it. Is there a chance of damage besides tripping a breaker if the compressor is too big? Electricity is something I try to stay away from unless I have to, but I am better at reading and research than my dad and brother so they referred to me on this. I told them to have it hard wired in under the house. Max amperage of motor is 21. Honda Rates the generator for 20.8Amps 500KW max(30min run time), 18AMP 4500KW continuous, with the ability to do 29.1AMP 7000KW for a 10 second surge to "start heavier equipment". Depends on how "reliable" that tiny breaker is. Also, depends on the generator's ability to keep 240v at 60hz. Too low of a voltage, or to far off of 60hz and you can toast the motor of the compressor. Depending on how "close" the generator is to running the compressor, you can install a "hard-start capacitor". This can help the start up. The max amperage of the motor is a running amperage. That compressor is gonna pull a fuck-ton of amps on start-up, especially with a full tank. I still don't think it's gonna work, but go for it. Might be surprised. |
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Posted: 9/27/2016 9:47:47 PM EDT
[#8]
Quote HistoryQuoted:
Depends on how "reliable" that tiny breaker is. Also, depends on the generator's ability to keep 240v at 60hz. Too low of a voltage, or to far off of 60hz and you can toast the motor of the compressor. Depending on how "close" the generator is to running the compressor, you can install a "hard-start capacitor". This can help the start up. The max amperage of the motor is a running amperage. That compressor is gonna pull a fuck-ton of amps on start-up, especially with a full tank. I still don't think it's gonna work, but go for it. Might be surprised. Quote HistoryQuoted:
Quoted:
Quoted:
The L shaped one is the ground. Directly across from it is the neutral. The 2 sides are the hots. Assuming you are sure it's a 230v motor, The black and white are hot. Green ground. That isn't that big of a generator, compressors use ALOT of power to start. BTW this is one of them questions that if you have to ask, you shouldn't be doing this. I'm not doing it, but I did some searching of the generator manual online, and had him send me the tag on the compressor motor so I know its a 230v 1 phase motor. I also think that the generator is undersized but he wants to try it. Is there a chance of damage besides tripping a breaker if the compressor is too big? Electricity is something I try to stay away from unless I have to, but I am better at reading and research than my dad and brother so they referred to me on this. I told them to have it hard wired in under the house. Max amperage of motor is 21. Honda Rates the generator for 20.8Amps 500KW max(30min run time), 18AMP 4500KW continuous, with the ability to do 29.1AMP 7000KW for a 10 second surge to "start heavier equipment". Depends on how "reliable" that tiny breaker is. Also, depends on the generator's ability to keep 240v at 60hz. Too low of a voltage, or to far off of 60hz and you can toast the motor of the compressor. Depending on how "close" the generator is to running the compressor, you can install a "hard-start capacitor". This can help the start up. The max amperage of the motor is a running amperage. That compressor is gonna pull a fuck-ton of amps on start-up, especially with a full tank. I still don't think it's gonna work, but go for it. Might be surprised. Thank you. |
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Posted: 9/27/2016 10:08:49 PM EDT
[#9]
Is there a "LRA" rating on the compressor motor name plate?
Can you post a pic of the name plate? |
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Posted: 9/27/2016 10:14:25 PM EDT
[#10]
Quote HistoryQuoted:
Is there a "LRA" rating on the compressor motor name plate? Can you post a pic of the name plate? Standby I deleted it. Having him resend. Edit I found it, 
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Posted: 9/27/2016 10:15:08 PM EDT
[#11]
Quote HistoryQuoted:
Is there a "LRA" rating on the compressor motor name plate? Can you post a pic of the name plate? Or a "motor code" on the motor nameplate? Either way you are on the hairy edge with that small of a generator. |
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Posted: 9/27/2016 10:16:03 PM EDT
[#12]
I would use a voltmeter to see which legs are hot. A 240V anything could not care less what the grounding system is. It's just there to help prevent injury due to a short circuit and to trip a breaker if needed.
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Posted: 9/27/2016 10:19:15 PM EDT
[#13]
Picture posted above
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Posted: 9/27/2016 10:32:21 PM EDT
[#14]
That is a 5hp motor. You got WAY too small of a generator to even think of starting that.
You would need one of the big generac portables in the 20kw range to do anything with that big compressor. Don't even waste your time hooking it up. |
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Posted: 9/27/2016 11:14:55 PM EDT
[#15]
Quote HistoryQuoted:
That is a 5hp motor. You got WAY too small of a generator to even think of starting that. You would need one of the big generac portables in the 20kw range to do anything with that big compressor. Don't even waste your time hooking it up. Thanks again guys. I think I have talked my brother in to paying a electrician to wire in a 50AMP outlet or two. |
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Posted: 9/27/2016 11:23:34 PM EDT
[#16]
Quote HistoryQuoted:
Standby I deleted it. Having him resend. Edit I found it, http://i18.photobucket.com/albums/b136/87XR250R/Mobile%20Uploads/IMG_20160927_160304103_HDR_zps0wtfclaf.jpg Quote HistoryQuoted:
Quoted:
Is there a "LRA" rating on the compressor motor name plate? Can you post a pic of the name plate? Standby I deleted it. Having him resend. Edit I found it, http://i18.photobucket.com/albums/b136/87XR250R/Mobile%20Uploads/IMG_20160927_160304103_HDR_zps0wtfclaf.jpg So your FLA (full load amps) is rated at 21.5A. LRA (locked rotor amps) which is the inrush current needed to start a motor from a dead standstill is usually 150% of FLA, so you can expect 32.25A at start up. On compressors this can actually be much higher as they can start under pressure (some have unloaders), so depending on how your compressor is set up you can see as much as 175% to 200% your FLA. That compressor cannot handle that load. |
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Posted: 9/27/2016 11:50:33 PM EDT
[#17]
Starting current is much higher than 150 percent of full load current, more like 600 to 800 percent as a rule of thumb but only briefly and quickly tapering down to the Full Load Amps.
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Posted: 9/28/2016 1:57:39 AM EDT
[#18]
Quote HistoryQuoted:
Starting current is much higher than 150 percent of full load current, more like 600 to 800 percent as a rule of thumb but only briefly and quickly tapering down to the Full Load Amps. I actually had to go and look. You are correct. |
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