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The blue GEN OFF BUS light comes on when the engine
generator control breaker (GCB) is open. This shows that the
IDG is not a power source in use. The light goes off when the
GCB closes.
APU GEN OFF BUS Light
The blue APU GEN OFF BUS light shows that the APU is
running, but its generator is not a power source in use. The light
is on when the APU is running and the auxiliary power breakers
(APBs) is open. The light goes off when the APB closes or you
shut down the APU.
Engine Generator Switches
The engine generator switches give manual control for IDG
power source selection. Each switch is a three-position switch
and is spring-loaded to the center (neutral) position. The ON
and OFF positions are momentary positions.
when you put a generator switch momentarily to the ON
position, you make that IDG the power source for its AC transfer
bus. If IDG power quality is good, the electrical power system
first removes the present power source (open its generator
breaker). Then, the generator breaker for the IDG closes and
the IDG now supplies power. See Electrical Power, Operation,
General Description in this section for more information.
APU Generator Switches
The APU engine generator switches give manual control for
APU generator power source selection. There are two switches
because there are two bus tie breakers (BTBs). The switches
operate like the engine generator switches. See Electrical
Power, Operation, General Description in this section for more
information.
Bus Transfer Switch
The bus transfer switch gives you manual control of the BTBs,
the DC BUS TIE RELAY, and the TRU 3 TRANSFER RELAY. The
switch has two positions (AUTO and OFF). The switch is usually
in the AUTO position. A cover is a guard for the switch in the
AUTO position.
In the AUTO position, the BTBs, the DC BUS TIE RELAY, and the
TRU 3 TRANSFER RELAY work automatically as necessary. In
the OFF position, the DC BUS TIE RELAY and the TRU 3
TRANSFER RELAY cannot energize. The operation of the BTBs
when the switch is in the OFF position depends on the electrical
power source conditions before you move the switch. See the
AC GENERATION-BREAKER CONTROL for more information
on the BUS TRANSFER SWITCH and BTB operation.
See the DC GENERATION-DISTRIBUTION AND CONTROL For
more information on the operation of the DC BUS TIE RELAY
and the TRU 3 TRANSFER RELAY.
ELECTRICAL POWER - AC SYSTEMS, GENERATOR, AND APU MODULE - GENERAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
You use switches on the forward P5 overhead panel or the
forward attendant panel to operate the electrical system. Refer
to the distribution general description page in this section for
more information about the operation effect on distribution.
Electrical Meters, Battery And Galley Power Module (P5-13)
You put the BAT switch to the ON position to energize these
buses and components with battery power:
* Switched hot battery bus
* Battery bus
* Static inverter
* AC standby bus
* DC standby bus
* P5-13 alphanumeric display.
AIRPLANES WITH THE GALLEY SWITCH;
* You use the GALLEY switch to control power to all galleys.
AIRPLANES WITH THE CAB/UTIL AND IFE/PASS SEATS
SWITCHES;
* You use the CAB/UTIL switch to control power to all galleys
and some utilities.
* You use the IFE/PASS SEATS switch to control power to the
passenger entertainment systems.
You use the DC and AC selectors and the alphanumeric display
to monitor the electrical power system power sources.
Generator Drive And Standby Power Module (P5-5)
The generator drive disconnect switch operates the disconnect
mechanism for its integrated drive generator (IDG). This
removes engine accessory gearbox power from the IDG. The
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