WIRING HARNESS
HYDRAULIC SEAL DRAIN PORT HYDRAULIC RETURN PORT
HYDRAULIC SERVO VALVE
ELECTRICAL CONNECTOR
GENERATOR
HYDRAULIC MOTOR GENERATOR C
HYDRAULIC MOTOR GENERATOR TEST SWITCH
TEST
HYD GEN
MISCELLANEOUS TEST PANEL F
Hydraulic Motor Generator System - Component Location
Figure 1A (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH 10 KVA HYDRAULIC MOTOR ú
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GENERATOR ú
ú 03 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. Page 5May 28/99
A51136
A
757 MAINTENANCE MANUAL
HYDRAULIC MOTOR GENERATOR TRANSFORMER HYDRAULICRECTIFIER UNIT (E1-1) MOTOR GENERATOR POWER PANEL, P71
SEE G
MAIN EQUIPMENT CENTER
A
HYDRAULIC MOTOR GENERATOR
CONTROL UNIT
CONTROL UNIT SEE H
HYDRAULIC MOTOR GENERATOR POWER PANEL, P71
G
MOUNTING BOLTS (4 LOCATIONS)
ELECTRICAL CONNECTOR
HYDRAULIC MOTOR GENERATOR CONTROL UNIT
H
Hydraulic Motor Generator System - Component Location Figure 1A (Sheet 3)
A75696
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH 10 KVA HYDRAULIC MOTOR ú
24-25-00
GENERATOR ú
ú 02 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. Page 6May 28/99
A
757 MAINTENANCE MANUAL
2) An electrohydraulic servo-valve is attached to the motor. The valve is controlled by feedback signals from the generator output frequency to maintain 400 |2 Hz under steady state conditions.
3) A mechanical overspeed governor maintains generator output frequency within 430 |10 Hz if the servo control system fails.
B. AIRPLANES WITH 10 KVA HYDRAULIC MOTOR GENERATOR; Hydraulic Motor Generator (10kva)
(1) The hydraulic motor generator is mounted on the inboard bulkhead of the left wheel well. It consists of two major parts; an oil-cooled, brushless generator and a hydraulic motor.
(a) Generator
1) The generator operates at 8000 rpm and develops an ac output. The ac output is 3-phase, 4-wire, wye connected, rated at 120/208 volts rms, 400 Hz, 10.0 KVA at 0.75 to unity power factor.
2) A permanent magnet generator section provides 3-phase power to the generator control unit for excition, control, and protection functions.
3) A exciter generator section supplies a 3-phase output to a full-wave rotating rectifier bridge for main field excitation. Excitation is controlled by the generator control unit to maintain a nominal 115v rms line to neutral at the end of the ac feeders in the P71 panel.
(b) Motor
1) The hydraulic motor is a servo-controlled, 8000 rpm constant speed variable displacement unit designed for operation in a 3000-psi hydraulic system.
2) An electrohydraulic servo-valve is attached to the motor for speed control. The valve is controlled by feedback signals from the generator output to maintain frequency at 400 |2 Hz under steady state conditions. The speed control circuits are in the generator control uit.
C. Generator Control Unit
(1)
The generator control unit is located in the hydraulic generator power panel P71 which is mounted on the right sidewall aft of E4 rack. It is convection-cooled, solid-state unit which provides dc control power, and voltage regulation. It also provides undervoltage and underfrequency protection; power ready, voltage/frequency control, and speed control functions for the extended range operations system.
(2)
AIRPLANES WITH 10 KVA HYDRAULIC MOTOR GENERATOR; The generator control unit has two modes: monitor and operation. In the monitor mode the GCU receives its power from the battery bus and monitors the two main 115-volt ac buses. In the operational mode the GCU receives its power from the HMG permanent magnet generator in the HMG.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH HYDRAULIC MOTOR GENERATOR ú
24-25-00
ú ú 03 Page 7 ú May 28/99
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