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passenger entertainment systems.
P5-5 Generator Drive and Standby Power Module
You use the generator drive disconnect switches to do a manual
disconnect of the IDG input shafts from the engine accessory
gearboxes (AGB). The engine start lever must also be in the
idle position to do a manual disconnect of an IDG.
The generator drive light shows an IDG malfunction. The light
comes on when the IDG oil pressure is less than operating
limits or for an underfrequency condition.
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The standby power switch gives manual control to disable the
standby buses or to override the automatic control of the
standby buses from AC transfer bus 1 to battery/inverter power.
The STANDBY PWR OFF light comes on when any of these
buses do not have power:
* AC standby bus
* DC standby bus
* Battery bus.
P5-4 AC System, Generator and APU Module
Each IDG has a generator switch. Each switch supplies
electrical on/off signals to let the generator control unit
(GCU)close the generator control breaker (GCB).
The APU has two generator switches. Each switch supplies
electrical on/off signals to let the APU GCU (AGCU)close the
APU power breaker (APB).
The bus transfer switch provides on/off control of the automatic
bus transfer function. The bus power control unit (BPCU) senses
bus transfer switch position. The BPCU controls the bus tie
breakers (BTBs).
The TRANSFER BUS OFF lights give indication of power status
on each AC transfer bus. A TRANSFER BUS OFF light comes on
when no power is on its transfer bus. Thus, the GCB and BTB
are open when a TRANSFER BUS OFF light is on.
The SOURCE OFF lights show that a transfer bus is not
energized from the selected power source. For example, the left
SOURCE OFF light comes on when GCB 1 trips and the AC
transfer bus 1 receives power through the bus tie breakers
(BTBs) from IDG 2.
The GENERATOR OFF BUS lights provide indication of
generator control breaker (GCB) position. A GENERATOR
OFF BUS light is off when its GCB is closed. This shows that the
AC transfer bus has power from the IDG.
Note: The GENERATOR OFF BUS lights comes on anytime the
battery bus has power and the GCB is open. The operation of
the GENERATOR OFF BUS lights depends on GCB position
only. It is independent of engine operation or IDG output power
quality.
The APU GEN OFF BUS annunciator is on when the APU is on
and the APB is open. This shows that the APU is ready to load
(RTL) and the generator is not on either transfer bus.
The GRD PWR switch supplies manual control of the external
power contactor (EPC). The BPCU receives on/off signals from
the ground power switch to control the EPC.
The GRD POWER AVAILABLE light comes on when external
power is connected to the airplane and the power quality is
good. The light stays on until you remove the external power
source at the external power panel.
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IDG Wire Routing
The IDG feeder wires go from the IDG to the power distribution
　
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