HYDR RETURNR
HYDR PRESSURE CASE DRAIN
ON
SOLENOIDELECT CONNECTOR
MOTOR SERVO
SERVO VALVE

OVER-SPEED
CONT

ELECT CONNECTORGEN
.ACONTROL
3030ACV ACV
W1 OFF
FIELD .BPERMANENT
HOT BAT BUS
A
MAGNET .CGENERATOR
PORTHMG BAT CHGR
C
HYDR MOTOR GENERATOR
SEAL DRAIN  HMG TRU
PORT B PORT A
115V AC L BUSLEFT HYDRAULIC SYSTEM
.C 115V AC L BUS
L 115V AC.B
TRANSFER BUS115V AC L BUS.A
HMG INST XFR BUS
HYDR GEMB (SHT 3) DC VOLTS 115V AC L
XFR BUS RELAY
HYDR GEM
DC VOLTS
AC NEUTRAL
HYD GEN AC 115V AC R BUS
VOLTS SENSE.C.A (P71) FIELD115V AC R BUS
POINT OFR 115V AC
.B
FIELD  .B
REGULATION  HYDR GEM TRANSFER BUS
.C 5.05 A (SHT 3)
VAL (W)
115V AC R BUS.ANVM
HYDR GEM
HMG R XFR BUSON (W)
LATCH
IN AIR
.A PERFORMANCE
ONLY
.B MAGNET
.C GENERATOR

115V AC R
R EICAS CMPTR
XFR BUS RELAY115V AC L BUS
SOLENOID POWERSPEED DOWN .C
SPEED UP SERVO CAPTAIN 115V AC
115V AC L BUS
FLIGHT INSTRXFR BUSLEGEND:
.B
115V AC L BUSCHASSIS GND .A HYD RETURN HMG INST XFR BUSHYD PRESSURE HYDR DRIVEN GEN CONT UNIT
E
F
115V AC INSTR
XFR RELAY

Hydraulic Generator Control Schematic
Figure 2 (Sheet 4)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH 10 KVA HYDRAULIC MOTOR ú

 24-25-00
 GENERATOR  ú ú 01 Page 13 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A51148
A

757
MAINTENANCE MANUAL

 The 10kva HMG GCU provides a power ready signal if the generator is providing power of acceptable quality. In the event of an under/over voltage, under/over frequency, or over speed condition of the generator, the GCU will remove the power ready signal, within a minimum of 1.5 seconds. If the power quality is re-established within 11.5 seconds, the power ready signal will also be re-established. If the power quality is not re-established within
 11.5 seconds, the GCU will cause an HMG shutdown. The GCU will also shutdown the HMG if two protective trips occur within 60 seconds.
 (10)
 The momentary on toggle switch GND PROX/HYD GEN provided on the right side panel (P61) in the flight deck allows system checkout.

 (11)
 Checkout is accomplished with the main buses energized, EICAS operating, and the left hydraulic system pressurized.

 (12)
 Setting the test switch to HYD GEN position opens the sensing leads to the L and R main bus off sensing relays. It also provides an inflight logic signal to start the hydraulic generator and deactivates the standby battery charger.

 (13)
 When the generator has started, and the buses transferred, a status message HYD GEN ON is displayed on the EICAS lower display panel. Transfer of the captain's instrument bus relay is sensed to provide the signal to EICAS.

 (14)
 If the hydraulic shutoff valve is not fully closed a status message HYD GEN VAL appears after a 5 second delay on EICAS.

 (15)
 The EICAS maintenance page displays the ac and dc voltages, and ac frequency during checkout.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH HYDRAULIC MOTOR GENERATOR ú

 24-25-00
 ú ú 01 Page 14 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 FAULT ISOLATION/MAINT MANUAL
HYDRAULIC MOTOR GENERATOR SYSTEM
COMPONENT  SHT 102 FIG.  QTY  ACCESS/AREA  REFERENCE 
ACCUMULATOR - HYDRAULIC  1  LEFT WHEEL WELL  24-25-04 
CIRCUIT BREAKERS - 2  FLIGHT COMPARTMENT, P6 
HYD GEN CONT, C4349  1  6C3  * 
HYD GEN 28V DC POWER, C4348  1  6C7  * 
CIRCUIT BREAKERS - 2  FLIGHT COMPARTMENT, P11
AC BUS SENSE LEFT, C4356  1  11R6  * 
AC BUS SENSE RIGHT, C4357  1  11R29  * 
　
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