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 G.  Built-in-test equipment (BITE) in the GCUs and BPCU checks operation of the units and stores fault information. BITE information is shown on the BPCU display (Ref 24-23-00).
 H.  Control switches are on electrical systems control panel M10063. This panel is on pilots' overhead panel P5. Electrical system indications such as AC and DC load, frequency, and voltage appear on the ELEC/HYD page of the engine indication and crew alerting system (EICAS) display (Ref 31-41-00). The EICAS display panel is P2. This ELEC/HYD page is for maintenance functions only and is not accessible to the crew inflight.
 I.  AIRPLANES WITH 5KVA HYDRAULIC MOTOR GENERATOR; A hydraulic motor generator is provided as a non-time-limited backup source of electrical power. It comes on line automatically when power is lost at both main AC buses. The system is rated to supply 115/200 volt, 3-phase 5 kva ac power continuously.
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IDG = INTEGRATED DRIVE GENERATORGCB = GENERATOR CIRCUIT BREAKERBTB = BUS TIE BREAKERAPB = AUXILIARY POWER BREAKEREPC = EXTERNAL POWER CONTACTOR
AIRPLANES WITH HYDRAULIC MOTOR GENERATOR
AC Generation Block DiagramFigure 1
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757
MAINTENANCE MANUAL

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757
MAINTENANCE MANUAL

 J.  AIRPLANES WITH 10 KVA HYDRAULIC MOTOR GENERATOR; A hydraulic motor generator is provided as a non-time-limited backup source of electrical power. It comes on line automatically when power is lost at both main AC buses. The system is rated to supply 115/200 volt, 3-phase 10 kva ac power continuously.
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757 MAINTENANCE MANUAL
 POWER AND REGULATION - DESCRIPTION AND OPERATION
________________________________________________
General
_______
 A.  The auxiliary power unit (APU) generator supplies electrical power on the ground when: 1) External power is not available, and 2) the integrated drive generators are not operating.
 B.  The APU generator can supply electrical power inflight after an
 integrated drive generator failure.Component Details (Fig. 1)
_________________
 A.  APU Generator_____________
 (1)  The APU generator converts mechanical power, supplied by the APU, into electrical power. The generator has four terminal studs on its housing. An electrical connector is above the terminal studs. The generator weighs 62 pounds.
Operation
_________
 A.  Functional Description______________________
 (1)  
The APU generator is mounted to the APU by a keyhole flange. The APU drives the APU generator input shaft at a constant speed of 12,000-rpm. The generator converts this mechanical input into 115/200-volt, 3-phase, 90-Kva, 400 |5-Hz ac electrical power. (Full output power is available at altitudes up to 40,000 ft.). The electrical output power is available at four terminal studs on the APU generator. Leads run from the terminal studs to the auxiliary power breaker (APB). The power is then distributed to the system.

 (2)  
Voltage on the generator side of the APB is regulated by the APU generator control unit (GCU). The GCU maintains this point at 115 |1-volt ac, line-to-neutral, at 400-Hz, for loads up to 90-kva. (Voltage is regulated within 115 |1.5-volts ac for loads up to 112.5-kva, and within 115 |2-volts ac for loads up to 150-kva). The APU GCU's voltage regulator varies dc current to the generator field, to control generator output voltage. The electrical connector, on the generator housing, allows the GCU to control generator output and provide generator power to the APU GCU. The APU GCU is located on shelf 3 of equipment center rack E5.
　
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