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Posted: 2/11/2021 6:47:14 AM EDT
[#1]
Air compressors have very high start loads as they are working against pressure.
The first thing I would do is replace the breaker, once it's popped a few times it tends to open before it's rated load is achieved. Length of run is probably part of your issue. |
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Posted: 2/11/2021 7:12:17 AM EDT
[#2]
Replace the breaker.
You can also measure voltage drop when something is starting just to verify. But I doubt that’s the issue. Could be a going bad capacitor on the motors etc. Start with the breaker. |
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Posted: 2/11/2021 7:31:46 AM EDT
[#3]
Is it an arc fault breaker? Those really suck.
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Posted: 2/11/2021 8:26:50 AM EDT
[#4]
Locked rotor amps on those pieces of equipment are probably very high for a split second at startup.
The breaker is most likely doing it’s job but has weakened over time and the multiple trips. I’d start by checking all connections and replacing the breaker. |
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Posted: 2/11/2021 8:47:52 PM EDT
[#5]
Quote HistoryQuoted: Length of run is probably part of your issue. Both these recpt. are within 10' of the panel so they should be good. I'll get to look at it tomorrow and I'll check/try everything mentioned. Thanks all! |
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Posted: 2/11/2021 8:48:44 PM EDT
[#6]
Quote HistoryQuoted: Is it an arc fault breaker? Those really suck. No, just a regular 'ol breaker. |
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Posted: 2/11/2021 9:03:30 PM EDT
[#7]
Older pics.
Panel is behind the drill press. 2 plugs are on different breakers. 1 plug is behind the hammers  Attached File2nd, AC is right above it  Attached File |
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Posted: 2/11/2021 9:07:56 PM EDT
[#8]
Quote HistoryQuoted: Both these recpt. are within 10' of the panel so they should be good. I'll get to look at it tomorrow and I'll check/try everything mentioned. Thanks all! Quote HistoryQuoted: Quoted: Length of run is probably part of your issue. Both these recpt. are within 10' of the panel so they should be good. I'll get to look at it tomorrow and I'll check/try everything mentioned. Thanks all! I mean the run from the house to the workshop. |
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Posted: 2/11/2021 9:14:28 PM EDT
[#9]
Is this a SqD QO panel? Not sure about their Homeline brand, but I do know that QO has a lower inrush trip threshold than most other brands.
I've had to replace a few of their standard breakers with high magnetic breakers before. link |
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Posted: 2/11/2021 9:34:45 PM EDT
[#10]
Quote HistoryQuoted: I mean the run from the house to the workshop. Don't remember the size wire but it was sized(or was supposed to be) for the length of run it made. |
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Posted: 2/11/2021 9:36:06 PM EDT
[#11]
Quote HistoryQuoted: Is this a SqD QO panel? Not sure about their Homeline brand, but I do know that QO has a lower inrush trip threshold than most other brands. I've had to replace a few of their standard breakers with high magnetic breakers before. link That might be the issue I do think it is a QO panel. |
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Posted: 2/11/2021 10:04:18 PM EDT
[#12]
Do you have 220VAC available in the shop also? Most compressors can be reconfigured for 220 and that will drop its amperage requirement.
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Posted: 2/11/2021 10:11:28 PM EDT
[#13]
Quote HistoryQuoted: Do you have 220VAC available in the shop also? Most compressors can be reconfigured for 220 and that will drop its amperage requirement. I do, I'll look into that also. |
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Posted: 2/11/2021 10:26:38 PM EDT
[#14]
Was just looking around at breakers and saw this...
"the QO has the fastest trip mechanism of any breaker" So yea I bet that is going to be my issue. Now to find another type/brand that is compatible if any are. Hopefully I won't have to replace the box. |
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Posted: 2/11/2021 10:43:44 PM EDT
[#15]
Quote HistoryQuoted: Was just looking around at breakers and saw this... "the QO has the fastest trip mechanism of any breaker" So yea I bet that is going to be my issue. Now to find another type/brand that is compatible if any are. Hopefully I won't have to replace the box. The link in my last post is the high magnetic version, which has a higher trip threshold than the standard QO, for $17 on amazon. |
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Posted: 2/12/2021 4:39:30 PM EDT
[#16]
Not going to have time to check stuff tonight but it is a homeline panel.
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Posted: 2/12/2021 7:50:19 PM EDT
[#17]
Talked with my electrical distributor today and he claims Square D is nearly 10,000 pieces in the hole with this breaker due to production delays blamed on Covid.
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Posted: 2/12/2021 8:17:22 PM EDT
[#18]
I did get a chance to look at it. All connections were tight at breakers, recpt's, neutral/ground bars & main lugs. Put my amp meter on A/C and highest current it would display at startup was 15A and ran at 13.5A. Planer was 24A at startup and ran at ~10A(I think it was). I did swap the breakers with others in the panel & moved them to a different phase(they were both on "A" now on "B"). So I'll see what happens. A/C is on 1 circuit & I use the planer on 3 other circuits depending on where I set it up at. If I keep having issues I guess I'll pick up 4 high magnetic breakers for those 4 circuits.
Thanks to all. ETA... neither of them will convert to 220V |
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Posted: 2/12/2021 9:02:09 PM EDT
[#19]
Chances are your amp meter will not pick up inrush.
You say you have 121vac with nothing running. Check the voltage at the receptacle with the compressor running. Ideally the voltage drop would be less than 5%. Its suppose to be 3% or less, but up to 5% drop is ok with a 13+ amp draw. It could also be a capacitor on its way out too, as already mentioned in this thread, but the breaker should be replaced after tripping anyway, and the HM breakers are not that much more expensive. |
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Posted: 2/13/2021 10:12:18 PM EDT
[#20]
Quote HistoryQuoted: Chances are your amp meter will not pick up inrush. You say you have 121vac with nothing running. Check the voltage at the receptacle with the compressor running. Ideally the voltage drop would be less than 5%. Its suppose to be 3% or less, but up to 5% drop is ok with a 13+ amp draw. I got 120V at the recpt. with the comp. running I'd say that is pretty good. |
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Posted: 2/13/2021 10:18:33 PM EDT
[#21]
Quote HistoryQuoted: I got 120V at the recpt. with the comp. running That tells me that not only is your wire sized properly but also that your connections are rock solid too. Good job. If your meter reads Microfarads (µF) you can check your caps. Also look for any bulging in the cap. I'm betting the HM breakers will cure your problem though. |
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Posted: 2/13/2021 10:22:42 PM EDT
[#22]
Homeline High Magnetic Breaker
I don't have much experience with the Homeline as I don't do much residential, but I would think their inrush tolerance is inline with their QO brand. |
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Posted: 2/17/2021 6:04:14 PM EDT
[#23]
You can also increase the rating of the breaker to allow for reliable starting.
The breaker is providing short circuit protection for the feeds. Induction motors have built in temperature sensors that will not allow them to overload feeds. See that little red reset button on the motor? |
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