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PostPosted: Sat May 06, 2017 7:12 am 
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Brazilian Rosewood
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"Turns out that a gfci outlet trips and kills the circuit every time that I turn it on. "

I guess that means you have a ground fault somewhere in the rig. If you are not getting electrocuted by the thing it might not be a problem. bliss


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PostPosted: Sat May 06, 2017 7:29 am 
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I'd call the folks at FactoryMation.

edit:
Regarding grounding the VFD. On my jointer I had to connect 2 wires to the ground terminal: one to the ground on my power cord, the other to the body of my jointer. You may need to run a wire from the ground terminal to the body of your motor.

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PostPosted: Sat May 06, 2017 8:48 am 
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I've got the power coming in grounded to the dedicated bracket.

The line out to to motor grounded to the same bracket.

Then the line to the motor connected to each terminal correctly with the ground connected to the body of the motor.


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PostPosted: Sat May 06, 2017 12:34 pm 
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I'd like to button this thing back up and start using it. I'm a little paranoid that something isn't right but the Office is closed until Monday.

I did google it and see that this unit tripped other GFCI's as well. Not sure why, the unit runs fine and as far as I can tell everything is grounded correctly.


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PostPosted: Sun May 07, 2017 9:10 am 
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Did some more reading on the interwebs:
I tried other outlets in the garage that don't appear to have a GFCI and the VFD kills them all ..... resetting this one GFCI resets everything. So I guess every outlet in the garage is attached to this one GFCI!
GFCIs are designed to protect down-stream outlets, since the GFCI itself is relatively expensive. Power comes into the GFCI, then out to the other outlets, and all of them receive the same protection.

GFCIs DO NOT monitor current through the ground circuit. They compare the current in the two service lines (hot and neutral). If those values differ, the assumption is that the missing current is flowing to ground. Powering a large reactive load, particularly one with high peak current, can confuse the detection circuit and trip the GFCI when no real fault exists.

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borne2fly
01-08-2009, 07:25 PM
I called the Apps guys at Teco-Westinghouse and they confirmed what you guys have said ..... it won't work with a GFCI. The VFD is an industrial device and the residential GFCI outlets are simply too sensitive. He did say, however, that in the lab they tried using an isolation transformer between the VFD and GFCI and it worked. Makes sense, the transformer acted as a filter to shield the GFCI from the start-up transient. I'll try that. If it doesn't work, I'll rewire the place to a regular outlet. Geez, the gyrations you have to go through to get things to work these days! Good thing I don't play with HO trains anymore, my old layout would probably trigger every breaker in the neighborhood :)


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PostPosted: Sun May 07, 2017 1:31 pm 
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Brazilian Rosewood
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You could swap out the GFCI with the next "downstream" outlet and use the first one for the VFD. At least then the other outlets will be GFCI protected. Sometimes the start up voltage spike will trip a regular circuit breaker if the normal load is within spec.


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PostPosted: Sun May 07, 2017 1:38 pm 
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it only pulls 4 amps so I've just run it to the laundry room on an extension cord for now. Probably not a bad idea to move the GFCI outlet though and have a more direct power source.


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