Power Generation Flashcards
Voltage, amperage, and drive method of alternators
28 volt, 60 ampère, belt driven
Through what are the LH/RH alternator outputs connected to the LH/RH MAIN BUS
LH/RH alternator relays and 70 ampère circuit breakers
By what method are both main buses connected to the BATTERY BUS
Via 90 ampère circuit breaker
How is power output of the alternators measured
Both alternator output lines also run through their own current sensor
What happens in the event of a main battery failure
The field of each alternator is energised by two 12V 1.3A sealed lead acid batteries connected in series (excitation batteries)
How does the pilot connect the excitation battery to the alternator field, and through what size fuse
By use of the ENG MAST switches, via a 5 ampère fuse
What measures alternator output voltage
Alternator control unit
How do the alternator control units keep output voltage stable
Control the current through alternator field coils, via a pulse width modulated signal
When could L/R ALTN FAIL appear
Over/ under voltage, and a few other internal warnings
How do the alternator control units balance load between the two alternators
Measures temperature, and decrease voltage on the warmer one, in turn increasing voltage on cooler one
To what accuracy can the alternator control units balance the loads on the alternators
To within a few amps
