Re: Owen Dyneto generator wiring
Posted by Sherlock On 2017/11/24 17:14:33
Wow, that wiring diagram puts another wrinkle in the mystery! The circuitry is nothing like any other diagrams or descriptions I've seen for third brush generators.
So the Franklin generator has two separate fields providing current at either 2 amps or 75 amps. 75 amps is way too much current, and 2 way to little. Do the two fields offset each other somehow to provide the 8 to 14 amps needed depending upon load?
I have had it suggested to me that polarization is indeed sometimes necessary on these old third brush generators. If it has been sitting unused for a long time, the residual magnetism fades away to nothing. I was told to touch a lead from the negative post of the battery to the generator lead that supplies current to cut-out very briefly a few times and that would do it. I did try that but no dice. I've read you can polarize them backwards. Maybe I did that, or maybe with this novel circuitry, you have to go about it another way.
Measured resistances as best I could trying to ascertain whether the wiring is still good within. With both leads disconnected from the grounding post next to the third brush (i.e. the lead from third brush and the lead from at least one pair of field coils are disconnected - the other pair of field coils may be grounded elsewhere), if I ground one wire from the ohmmeter and touch the other to any of the brushes, I get 12 ohms resistance. Connect one wire to the (disconnected) lead that goes to the cut-out, I get 2 or 3 ohms resistance at each brush. Does this make sense given the wiring configuration in the diagram?
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So the Franklin generator has two separate fields providing current at either 2 amps or 75 amps. 75 amps is way too much current, and 2 way to little. Do the two fields offset each other somehow to provide the 8 to 14 amps needed depending upon load?
I have had it suggested to me that polarization is indeed sometimes necessary on these old third brush generators. If it has been sitting unused for a long time, the residual magnetism fades away to nothing. I was told to touch a lead from the negative post of the battery to the generator lead that supplies current to cut-out very briefly a few times and that would do it. I did try that but no dice. I've read you can polarize them backwards. Maybe I did that, or maybe with this novel circuitry, you have to go about it another way.
Measured resistances as best I could trying to ascertain whether the wiring is still good within. With both leads disconnected from the grounding post next to the third brush (i.e. the lead from third brush and the lead from at least one pair of field coils are disconnected - the other pair of field coils may be grounded elsewhere), if I ground one wire from the ohmmeter and touch the other to any of the brushes, I get 12 ohms resistance. Connect one wire to the (disconnected) lead that goes to the cut-out, I get 2 or 3 ohms resistance at each brush. Does this make sense given the wiring configuration in the diagram?
Attach file:
(279.66 KB)
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