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frequency
* Ready-to-load (RTL) signal from the APU electronic control
unit (ECU)
* APU generator switch positions (APS)
* Position status of the external power contactor (EPC)
* APB hold off (prevents APB close)
* Signal from the APU fire switch
* Position status from the APB.
GCU Outputs
The AGCU has these output signals:
* APU generator switch 1 and 2 position to BPCU
* Voltage regulator enable (VR)
* Overvoltage (OV) or undervoltage (UV) protection flag
* APU power available signal to BPCU.
Built-In-Test-Equipment (BITE)
THE AGCU has front face BITE to help you do troubleshooting of
the electrical system. See GCU/AGCU - TRAINING
INFORMATION POINT in this section for more information.
AC GENERATION - APU GENERATOR CONTROL UNIT (AGCU) - GENERAL DESCRIPTION
EFFECTIVITY
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AC GENERATION - APU GENERATOR CONTROL UNIT (AGCU) - GENERAL DESCRIPTION
AC GENERATION - APU GENERATOR CONTROL UNIT (AGCU) - GENERAL DESCRIPTION
EFFECTIVITY
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General
The AGCU uses inputs and internal logic to control the auxiliary
power breaker (APB) position.
The AGCU uses manual input from the APU generator switches
to close or open the APB. The BPCU sends a signal to open the
APB if an alternate power source selection occurs. The AGCU
power quality protective circuits also open the APB if power
parameters are not in limits.
APB Close
The AGCU sends a close signal to the APB when all of these
conditions occur:
* Either APU generator switch to ON position
* BTB positions and GCB positions are set to prevent two
power sources to one AC transfer bus
* Starter-generator power output quality is good
* AGCU has an APU ready-to-load (RTL) signal from the APU
electronic control unit (ECU)
* External power contactor (EPC) is open.
When there is a command to close the APB, the BPCU sends a
signal to the GCU to open the generator control breakers (GCB).
The BPCU also sends an open signal to the external power
contactor (EPC).
APB Open
The AGCU sends an open signal to the APB when one or more
of these conditions occur:
* You select another power source (BPCU sends open signal
to GCU)
* Both APU generator switches to the OFF position
* RTL signal to the AGCU goes away
* APU switch to OFF
* APU fire switch to the fire position
* Power quality goes out of limits.
AC GENERATION - AGCU - AUXILIARY POWER BREAKER (APB) CONTROL
EFFECTIVITY
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