Generator vs Alternator Bus
in 912 / 914 Technical Questions
6 years ago
Team, my LSA plane has a 914 with one bus powered by the built in generator and one bus powered by the aux alternator, each bus has its own battery. I suppose the generator output comes from a rectifier/regulator. I suppose the alternator output also must use some diodes or something to convert to DC but I am not sure.
Each bus is independent. However if the generator or the alternator fails I would like to be able to have a switch to tie the buses. I heard that it is not possible but I am not sure why. I may guess that if both circuits are running fine then tying them could be an issue since one may “backfeed” the other one but I am not sure why that would be a problem either.
If an emergency tie switch is installed and inadvertently turned on with both generator and alternator running fine I would not want to burn anything. If the generator fails then why would it or the rectifier care if the buses are tied? Conversely, if the alternator fails, why would it care if there is volatage showing on its output?
Thanks to explain.
Best regards,
Jeff
Each bus is independent. However if the generator or the alternator fails I would like to be able to have a switch to tie the buses. I heard that it is not possible but I am not sure why. I may guess that if both circuits are running fine then tying them could be an issue since one may “backfeed” the other one but I am not sure why that would be a problem either.
If an emergency tie switch is installed and inadvertently turned on with both generator and alternator running fine I would not want to burn anything. If the generator fails then why would it or the rectifier care if the buses are tied? Conversely, if the alternator fails, why would it care if there is volatage showing on its output?
Thanks to explain.
Best regards,
Jeff
