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AC GENERATION - BREAKER CONTROL - FUNCTIONAL DESCRIPTION
AC GENERATION - BREAKER CONTROL - FUNCTIONAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The AC systems, generator, and APU panel on the P5 overhead
panel has these lights:
* GRD POWER AVAILABLE
* TRANSFER BUS OFF (1 and 2)
* SOURCE OFF (1 and 2)
* GEN OFF BUS (1 and 2)
* APU GEN OFF BUS.
All lights are push-to-test. All lights also come on when you put
the master dim test switch to the test position.
GRD POWER AVAILABLE Light
The blue GRD POWER AVAILABLE light comes on when
external AC power is connected and the quality is good. The
bus power control unit (BPCU) does a check of power quality
and supplies the ground for the light to come on. The light can
get power from any of these three sources:
* Switched hot battery bus
* DC bus 1
* BPCU internal power transformer, which gets power from
ground power source.
The light is bright blue when it is on. The light does not go dim
with the master dim test switch in the dim position.
For more information about external power, see the external
power section.
TRANSFER BUS OFF Light
The amber TRANSFER BUS OFF light comes on when the AC
transfer bus does not have power. There is one light for each
AC transfer bus. The generator control unit (GCU) monitors the
transfer bus-phase C power to control the ground for the light.
GCU 1 monitors transfer bus 1, GCU 2 monitors transfer bus 2.
The power for TRANSFER BUS OFF light 1 comes from DC bus
1 and the battery bus. The TRANSFER BUS OFF light 2 power
comes from DC bus 2 and the battery bus.
The master caution light also comes on when either TRANSFER
BUS OFF light comes on. ELEC comes on the annunciator
panel.
SOURCE OFF Light
The amber SOURCE OFF light supplies indication that an AC
transfer bus is not energized by the source you last selected.
The left SOURCE OFF light is related to these sources:
* IDG 1 (GEN 1 switch)
* APU (left APU GEN switch)
* External power (ground power switch).
The right SOURCE OFF light is related to these sources:
* IDG 2 (GEN 2 switch)
AC GENERATION - AC SYSTEMS, GENERATOR, AND APU PANEL - INDICATION
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* APU (right APU GEN switch)
* External power (ground power switch).
The BPCU monitors the auxiliary power breaker (APB) position
and the APU generator switch position to supply a source-off
logic input to the GCU. Logic in the GCU then supplies the
ground for the SOURCE OFF light. Master caution also comes
on with either SOURCE OFF light. ELEC comes on on the
annunciators panel. See the BUS TIE BREAKER CONTROL -
FUNCTIONAL DESCRIPTION page in this section for more
information about the BPCU SOURCE OFF logic.
GEN OFF BUS Light
The blue GEN OFF BUS light comes on when the engine
generator control breaker (GCB) is open. The power for the
GEN OFF BUS light 2 comes from DC bus 2. The GEN OFF BUS
light 1 get power from DC bus 1. Power also comes from the
battery bus when the master dim test switch is in the BRT
position. The light gets a ground through the auxiliary contacts
of its generator control breaker. The light goes off when the
GCB closes.
APU GEN OFF BUS Light
The APU electronic control unit (ECU) and the auxiliary power
breaker (APB) control the blue APU GEN OFF BUS light. The
APU supplies a ready to load (RTL) signal when the ECU senses
the APU above 95 percent and not in a cool down cycle. The
APB auxiliary contacts complete the circuit to ground when the
APB is in the open position.
The light goes off when the APB closes (you select APU
generator power) or when you shut down the APU (RTL signal
goes away).
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