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move to the commanded position. This light does not come on
for the AGCU.
FEEDER FAULT Light
The FEEDER FAULT light comes on when the GCU opens the
breaker for any of these problems:
* Differential current
* Phase sequence
* Undervoltage (IDG only, voltage regulator okay).
DIST/BUS FAULT Light
The DIST/BUS FAULT light comes on when the GCU/AGCU
protection circuits open a GCB/APB for any of these power
channel problems:
* Overcurrent
* Unbalanced phase current.
GCU PASS Light
The GCU PASS light comes on after the GCU passes a self test
that you start. You push the GCU TEST switch for at least one
second to start the GCU self test.
GCU Test Switch
You push the GCU test switch to start a self test. The test turns
off any fault light that is on before the test. The fault light comes
back on when the conditions that made the light come on are
true again. The GCU does not respond to the GCU test switch if
the applicable AC power source has excitation.
AC GENERATION - GCU/AGCU - TRAINING INFORMATION POINT
EFFECTIVITY
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AC GENERATION - GCU/AGCU - TRAINING INFORMATION POINT
AC GENERATION - GCU/AGCU - TRAINING INFORMATION POINT
EFFECTIVITY
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Purpose
The APU starter-generator has two functions.
First, the starter-generator makes AC power for ground
operations. The starter-generator can supply electrical power
during flight as backup to the IDGs.
The starter-generator also starts the APU. It uses AC power
from the start converter unit (SCU) to turn the APU during the
start sequence.
Location
The starter-generator is on the right side of the APU gear box. It
attaches to the gearbox with 8 nuts. You replace the startergenerator
without removal of the APU.
General Description
The APU starter-generator is an oil cooled, three phase,
brushless, rotating rectifier machine. It operates at 12,000 rpm.
The generator includes these components:
* An exciter
* A main generator
* A permanent magnet generator (PMG).
The PMG supplies power for start-up, and voltage control of the
APU channel.
The starter-generator supplies 3 phase, 115/200 volts (nominal)
power at 400Hz. The starter-generator supplies up to 90 KVA
below 32,000 feet (9753 meters). The starter-generator can
supply 66 KVA at 41,000 feet (12,496 meters).
AC GENERATION - APU STARTER GENERATOR
EFFECTIVITY
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AC GENERATION - APU STARTER GENERATOR
AC GENERATION - APU STARTER GENERATOR
EFFECTIVITY
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General
The APU GCU (AGCU) uses inputs to control auxiliary power
breaker (APB) position. The AGCU and the start converter unit
(SCU) supply protection for the starter-generator and system
loads.
The AGCU is the same part as the GCU. The inputs to the AGCU
are different than for GCU 1 and GCU 2. GCU 1 and GCU 2 use
an internal voltage regulator to control generator output. The
AGCU uses a voltage regulator in the SCU to control startergenerator
output.
APU Generator Control Unit (GCU) Inputs
The AGCU receives power from one of these two sources:
* Switched hot battery bus
* DC bus 2.
The AGCU uses 28v dc to power its control and protection
circuits.
The AGCU receives three-phase sense current inputs from
these two points:
* Neutral current transformer (NCT) inside the APU generator,
between the generator and ground
* Differential protection current transformer (DPCT) on the
APU power feeders, between the generator and the auxiliary
power breaker (APB).
The AGCU receives three-phase sense voltage input from
splices into the feeder wires between the starter-generator and
the auxiliary power breaker (APB).
The AGCU receives these other inputs:
* APU starter-generator permanent magnet generator (PMG)
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