[GreenKeys] Model 15 Governor motor Specs RQ

[E.]

It’s been a while since I’ve had my 19 on, but occasionally it would trip the GFCI on the wall with a synchronous motor.  I’m trying to remember the exact circumstances, but I think it would happen when I'd switch on the 19.  I had always assumed that there was an initial surge of electricity getting the motor going, thus causing a brief grounding situation.  I’ve never been concerned enough to trace it down.

…but I also remember seem to remember that there may be a second hot wire that may be connected to the switched-on position on a 19.  Again, if I remember correctly, this second wire would have gone back to the table via the not-usually-seen four-prong plug — in order to power the rest of the table on a 19.  Usually these are taped off when using a three prong, but you might want to double check to see if this wire may be on a terminal it shouldn't be on or maybe even making contact with metal ground - if the tape has worn off.  Since a 15 and a 19 are pretty much almost the same, this could possibly be the case.


> On Jan 20, 2025, at 4:31 PM, Duncan Brown <duncanancy at earthlink.net> wrote:
> 
> Bambi,
> 
> Since you have replaced the filter caps, it may be that their normal impedance is enough to provide a current to trip the GFI.  It doesn't take much to trip a GFI.
> 
> I have a Kleinschmidt TT-98 that I had to install a separate power outlet because it would trip the GFI on my bench.  I could not find anything wrong with the TT-98 (which was also a series governed motor).
> 
> So there may be nothing wrong with the motor.
> 
> A series governed motor has a lot of sparking from the brushes and switching the series resistor in and out of the circuit.  This can cause interference with radios, so a big RFI filter, with capacitors to both sides of the line to ground, is used.
> 
> Either change out the S-G motor for a synchronous one, or used a grounded power cord on a non-GFI circuit.
> 
> have fun,
> 
> Duncan
> K2OEQ