In Reply to: Re: 6 volt generator posted by soundguy on November 14, 2012 at 08:13:11:
This thread is becoming a short course in elastricity and magnetism
also find it rather comical
That sounds like good advice to repolarize after disconnecting battery.
On my other tractor, allis chambers, I always remove the battery when the tractor is not in use and place the battery on a Deltran battery tender maintainer.
The source of power for the charger is 70 miles from the orchard farm. This no power at the farm except for gasoline powered generators.
trying to determine a method to test the generator for correct polarity before it is actually connected to the cutoff relay or VR.
The one output ternminal 3 brush, internal grounded, internal sourced field is easy.
Run the generator with the engine and place the negative lead of volt meter on output terminal. If the meter reads positive voltage the generator is polarized correctly. The generator and battery are in parallel and not series connected.
With the 2 brush & 3 brush ,external grd field, INTERNALLY sourced field type generators
suppose the field terminal could be temporarly jumped to grd and the volt meter negative lead placed on the armature terminal with the generator spinning, if the meter reads positve voltage, then the generator is polarized, correctly?
Don't have clue on how to test the 2 brush internal grd field, EXTERNALLY sourced field type, because have to actually connect the battery to the generator field.
The battery has lot of stored energy, one was pull a tractor with a wrench and battery set up with both on the ground. Some how the 5/16 wench cable got jumped between the positive and nagative terminals on the battery. The cable was melted into, with a 2 ft long section cable laying next to thebattery.
So understand it would be very easy to fry the VR.
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