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Post by randyt on Jul 9, 2012 18:19:52 GMT -7
I have a kubota generator that is causing me a problem. The darn thing wont charge unless I plug a drill motor into the duplex and give the chuck a spin.. This energizes the generator and it starts to charge. It's not a big problem but there must be a permanent fix.
any thoughts?
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Post by tjwilhelm on Jul 9, 2012 20:09:53 GMT -7
Can you explain this in a little more detail? What do you mean when you say it "won't charge?" Do you mean the alternator spins but there is no 120vac output at the outlets; or do you mean the onboard generator will not recharge the starting battery; or do you mean something else?
A number of folks here could probably help; but, we need more detail.
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Post by graf on Jul 10, 2012 1:38:25 GMT -7
Years ago when I worked on generators occatioanlly we would have to flash the rotor to reenergize the field. Now things change with time with improvments and all but sounds like very similar problem. Have a professional check it out, when homeowners used to try and repair their generators it always cost more for repairs.
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Post by randyt on Jul 10, 2012 3:19:46 GMT -7
thanks for the comments. The alternator spins but don't put out 120 volts until I flash the field. I need to do this every time the generator is used.
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Post by walter2 on Jul 10, 2012 4:53:41 GMT -7
I think you may need to use house current . After exciting the field test all the 110 outlets if one doesn't work you will have to reenergize that field. There is lots of info as to how to do this with a google search. Good luck.
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Post by tjwilhelm on Jul 10, 2012 5:56:51 GMT -7
I'll take a stab in the dark here.
If flashing the field causes the output to work, then it's got to be a wound-field (as opposed to a permanent magnet field). Most likely it will be shunt-wound or compound-wound...probably shunt wound.
If you never had to flash the field before, then the field was either "excited" by an external exciter circuit; or, the field is self-excited which requires either an auxilliary permanent magnet or sufficient residual magnetism in the field's core to start the self-excitation circuit.
Not knowing the size or configuration of the alternator, I'm gonna take a wild hair guess that it has a small exciter-generator on board and that there is a broken wire (or some kind of open) between the exciter's DC output and the alternator's field input. It could also be the exciter's recifier or voltage regulator is bad.
Sure would be nice to have a wiring diagram!
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Post by randyt on Jul 10, 2012 15:06:09 GMT -7
thanks for the comments. I'll search up a diagram, it would be helpful.
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