QuestionHi, Firstly, can you tell me the function of the rotary switch on my generator marked "50Hz" and a "lamp" symbol. It is not shown on the manual or wiring diagram? Secondly , the alternator is nor producing output, only about 15v AC, after it went overspeed briefly. The winding measurements seem reasonable (about 5 ohms main winding, 3ohm capacitor winding), and the capacitor reads 13microfarad. Do you have any figures for the windings.Ive also tried checking the diode & resistor on the Field winding but not sure about values?Could i have lost residual magnetism?If so how do I restore it? Any other checks I can make?
AnswerI am not sure what the rotary switch is for, but if i had to take an educated guess, I would say that needs to be set to the proper Hz position according to what type of equipment would be powered be the generator. In the U.S. They are set to 60Hz. Yours may need to be set at 50Hz.
On the low voltage issue, I would say that due to the over speeding of the engine, may have resulted in damage to a voltage regulator, or caused a flying short in the rotor. It sounds as if the generator is trying, which means that it still has its residual magnetism.
I would start by replacing the AVR if all the other rotor and stator ohms measurements are in spec.
