*
Right GCU
*
APU GCU
*
Left GCU.
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AC GENERATION -MAIN EQUIPMENT CENTER -COMPONENT LOCATIONS
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AC GENERATION -ELECTRICAL PANELS -COMPONENT LOCATIONS
General P300 Auxiliary Power Panel
The ac generation system has components in these ELMS The APB is in the auxiliary power panel panels:
*
P100 left power panel
*
P200 right power panel
*
P300 auxiliary power panel.
See the electrical load management system section for more information on the location, removal, and installation of panel components (SECTION 24-09).
P100 Left Power Panel
These are the components in the left power panel:
*
L GCB
*
L BTB
*
L TBB
*
L CCB.
P200 Right Power Panel
These are the components in the right power panel:
*
R GCB
*
R BTB
*
R TBB
*
R CCB.
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AC GENERATION -ELECTRICAL PANELS -COMPONENT LOCATIONS
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AC GENERATION -CONVERTER SUPPLEMENT COOLING FAN -COMPONENT LOCATION Converter Supplement Cooling Fan
The converter supplement cooling fan is on the right side of the MEC below the P210 right power management panel.
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AC GENERATION -CONVERTER SUPPLEMENT COOLING FAN -COMPONENT LOCATION
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AC GENERATION -BACKUP POWER -BACKUP GENERATOR CONVERTER & SUPPLEMENT COOLING FAN
Backup Generator Converter * High temperature difference across the converter
* Inlet air temperature is greater than 40 degrees C and the The backup generator converter gets variable frequency ac backup system supplies power to one transfer bus power from both backup generators. It changes the variable * Forward equipment cooling failure. frequency power into 115v, 400 hz, ac power. The converter supplies power to one or both transfer buses.
The converter also controls, monitors, and protects the backup electrical power system. The converter does an automatic test of the backup system immediately after an engine start. These are some of the protective functions of the converter:
*
Over/undervoltage
*
Over/underfrequency
*
Overcurrent
*
Differential protection
*
Converter fault.
Supplement Cooling Fan
The backup generator converter gets cooling air from the forward equipment cooling supply fans. It also gets cooling air from the supplement cooling fan.
The supplement cooling fan is an axial flow blower with an integral discharge check valve. The backup generator converter turns the fan on when it supplies it with 115v ac power during these conditions:
*
Backup system test after an engine start
*
Backup system supplies power to both transfer buses
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AC GENERATION -BACKUP POWER -BACKUP GENERATOR CONVERTER & SUPPLEMENT COOLING FAN
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AC GENERATION -APU GENERATOR POWER -GENERATOR CONTROL
General
The APU GCU controls, protects, and monitors the APU power.
The forward equipment cooling system actively cools the GCU.
GCU Power
The APU GCU power supply gets power from two different sources. One source is the PMG in the APU generator. The other source is the captain’s flight instrument bus.
Generator Excitation
The voltage regulator controls the power level to the exciter field in the generator. The voltage regulator rectifies ac power from the PMG to make dc current for the exciter field. Power to the voltage regulator goes through the generator control relay (GCR).
The generator uses the exciter field current to make the ac current in the power feeders. The feeder cables go to the APB, the ground handling relay, and the ground service select relay in the auxiliary power panel.
The voltage regulator monitors the generator output voltage. This is called the point-of-regulation (POR) voltage. POR voltage is on the generator side of the APB. The voltage regulator adjusts the dc current to the exciter field to keep the POR voltage at 115 volts.
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