Pa28 electrical system
Hi
I am looking at the schematic of the electrical system for the pa28 and i am a bit puzzled: as far as i can tell, but correct me if i am wrong, the trckle charge to the electromagnet/rotor of the alternator is supplied from the MAIN dc bus through an ALT FIELD RELAY, an overvoltage relay and a VR.
The overvoltage relay will interrupt the trickle charge to the rotor causing the electromagnetic field to collapse and the alternator output to drop, should it sense an excessive current draw from the bus: is that correct? If so, would the alt field relay trip first? What is the difference - protection wise - between the field relay and the overvoltage relay?
The trickle charge from the field bus seems to be supplied through the master solenoid through a battery alternator interlock, how is that controlled? from the battery switch or from the alternator switch?
Also power from the alternator is fed into the master solenoid, what is its function?
Finally what is the alternator source power relay energizing circuit?
Many thanks
Baobab72