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Tool Talk Discussion Forum

Re: Compressor electrical question

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Stephen Newell

01-05-2013 16:03:52

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There seems to be something going on with L1. I finally got it to work but its a lot harder to work than the other two manually. Anyway I get the picture and can use what ever two contacts that do work.

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George Marsh

01-05-2013 16:39:04

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 Re: Compressor electrical question in reply to Stephen Newell, 01-05-2013 16:03:52  
Stephen, There may be an issue with the current sensor too. If there is, there are 3 screws, #2,#4,#6 (T1, T2, T3). If you loosen them, you may be able to remove the bottom half, current sensors.

I'm sure the code people will sound off and tell you not remove it. My reply is there hasn't been any current sensors when you were using the pressure switch and you didn't get killed or burn up the motor. There aren't any current sensors on other air compressors either. There are only factory internal motor protectors.

Let us know if it works. There is no reason why it shouldn't, except for a bad contactor.

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Stephen Newell

01-05-2013 16:59:39

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 Re: Compressor electrical question in reply to George Marsh, 01-05-2013 16:39:04  
I thought the current sensor was part of the lower unit with the overload protection. There is some device that you adjust the amperage you want.

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George Marsh

01-05-2013 19:04:20

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 Re: Compressor electrical question in reply to Stephen Newell, 01-05-2013 16:59:39  
Stephen, you are right, the bottom half is the current sensor. It was designed for 3 phase, current running through L1, L2 and L3. DH thinks it may not work on single phase. He gave you the simple way to install it. I can show you how you can try to use the current sensor, but only after the experts show you how to wire it.

Wire it the way DH showed and see if that part of your contactor works. It will be simple to add in the sensor circuit.

Keep in mind there was no current sensor when you had the pressure switch installed. Never seen a small air compressor wired with a current sensor, so what's the big deal if you leave it out? Your 3 phase contactor was an after market add on.


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Stephen Newell

01-05-2013 20:54:53

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 Re: Compressor electrical question in reply to George Marsh, 01-05-2013 19:04:20  
All of this is more than getting the compressor running. I want to understand it and learn from it too. I can forsee having to contend with another magnetic starter in the future. I appreciate everything everybody has done for me especially you running the gauntlet with something more controversial. It wasn't what I was needing at the time but if I had the parts I might have broken one leg temporarily to use the compressor in an emergency. I had to order a replacement pressure switch so I'm not going to be doing any permanent wiring until the end of the comming week.

One thing I will never understand is why they don't just make a heavier duty pressure switch.

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