Hi, I wanted to understand how different computers were powered.
So here are my questions:
1) When we press the master switch, there is a switch that get's pressed and it let's the courant pass threw it. It sends an electric signal. For the master switch, there can only be two of them: 28V = master switch pressed. 0V = master switch not pressed. Then the PEPDC will receive the 28V DC and will understand that it has to open the LP fuel valve. Airbus/Boeing has programmed the PEPDC, so that it knows the amount of courrant needed to open the LP fuel valve. It will then open anothee switch and close it when the LP valve would be open. Am I right here?
2) The ECU receives 28 DC V. But does it use 28V DC? Let's say that it needs to send 10V DC to the HMU, it needs 10V to calculate the amount of courant to give to the HMU and 2V DC to open the FMV. So in this case, it uses 22V DC. Where does the 6V DC go? Heat?
I am still learning, thanks to help!
