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Power generation is provided by two 60 Ampère alternators (generators) which are mounted on the bottom left side of each engine. The alternators are driven by a flat belt.
The power output line of the left hand alternator is connected to the 'LH main bus' via the LH alternator relay and a 70 Ampère circuit breaker. The power output line of the RH alternator is connected to the 'RH main bus' via the RH alternator relay and a 70 Ampère circuit breaker. Both 'main busses' are connected to the 'battery bus' via a 90 Ampère circuit breaker.
Both generator power output lines also run through a current sensor for each alternator, which provides an indication of the power being supplied to the electrical system by an alternator including the current for battery charging on the G1000. In the event of a main battery failure the field of each alternator is energized by two 12 V, 1.3 Ah sealed lead acid batteries ('excitation'-battery) connected in series, which are installed in the nose baggage compartment. The 'ENGINE MASTER LH (RH)'-switches connect the 'excitation'
' battery to the alternator field via a 5 Ampère fuse.
' If M.M 42-240 or O.M 42-074 or O.M 42-129 are carried out:
' The 'ENGINE MASTER LH (RH)'-switches connect the 'excitation' battery to the alternator ' field via a 10 Ampère fuse.
Page 7 - 50 Rev. 5 15-Nov-2007 Doc. No. 7.01.05-E
Alternator control:
Each alternator has an alternator control unit. It measures the alternator output voltage and controls the current through the alternator field coils via a pulse-width modulated signal. To keep the output voltage stable in all load and speed situations, the alternator field signal is modulated accordingly.
The alternator control unit includes a comprehensive set of diagnostic functions that will warn the operator using a caution message (L/R ALTN FAIL) on the G1000 PFD in case of over- or undervoltage as well as a couple of other internal warning levels.
Load Balancing: The alternator control unit supports load balancing across the two alternators via the internal alternator temperature. The temperature is measured and the alternator control unit slightly decreases alternator voltage output at higher internal alternator temperatures. Thus the load is partly shifted to the alternator with the lower internal temperature. This system is able to balance the actual load within a few amps between the two alternators installed.
Storage
'Main'-battery power is stored in a 24 V, 10 Ah lead-acid battery mounted on the right-aft side of the front baggage compartment. The 'main' battery is connected to the 'hot battery bus' and to the 'battery bus' via the 'battery'-relay which is installed in the relay junction box on the center-aft side of the front baggage compartment.
The 'battery'-relay is controlled with the 'ELECTRIC MASTER'-switch which is located on the left-hand side of the instrument panel.
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