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CSEU DC Power Schematic
Figure 5 (Sheet 3)
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757
MAINTENANCE MANUAL
PSM 1 RESET
PSM 1 VALID
PSM 2 RESET
PSM 2 VALID
A
B LEFT STABILIZER TRIM/ELEVATOR ASYMMETRYUNIT MODULE
28V DC ACD PSM 1 RESET
EF PSM 1 VALIDG
PSM 2 RESETPSM 2 VALID28V DC B
H
DC PWR GNDJ
DC PWR GND STBY BUS OFF
KL YAW DAMPER LEFT
L FLT CONT ELEC (W)30 SEC
L/R EICAS COMPUTER28V DC 128V DC 2PSM 1 VALIDPSM 2 VALID28V DC GND 128V DC GND 2
SPOILER CONT 1L
28V DC 128V DC 2PSM 1 VALIDPSM 2 VALID28V DC GND 128V DC GND 2
SPOILER CONT 2L
28V DC 128V DC 2PSM 1 VALID
MNPQR
S PSM 2 VALID
28V DC GND 1T
28V DC GND 2
SPOILER CONT 3L
____ TYPICAL SYSTEM
NOTE:
(LEFT SYSTEM SHOWN).
CSEU DC Power Schematic
Figure 5 (Sheet 4)
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AC INPUT
EMI
CSEU AC
FILTER
POWER
CONVERTER
REGULATOR
PWR SUPPLY
CONVERTER ASSY
115V AC INPUTMONITOR
V
REF(SH 4)
MONITOR ASSY
CSEU PWR SUPPLY 1L
____ TYPICAL SYSTEM
NOTE: (LEFT SYSTEM SHOWN).
|19V DC
HIGH VOLTPWMPOWER
POWERCHOPPER (SH 1)
SUPPLY +5V DC
PRIMARY FEEDBACKREGULATOR
PWMSECONDARY FEEDBACKCIRCUITS
CHANNEL 2 (SAME AS CHANNEL 1)SHUTDOWNV REF(SH 4)
(SH 4) LATCH TD 1
PSM RESET
RESET
CIRCUITS
(SH 4)
CHANNEL 1
INTERNALS
SAME AS
CSEU PWR
SUPPLY 1L
CSEU POWER SUPPLY 2L
CSEU DC Power SchematicFigure 5 (Sheet 5)
+5V
+5V DC
MONITOR
(SH 4)
TRIP+5V PSM VALIDCIRCUITS(SH 4)
+5V DC
LOGIC GNDLOGIC GND
+5V DC
LEFT STABILIZER TRIM/ELEVATOR ASYMMETRYLIMIT MODULE
+5V DC
LOGIC GNDLOGIC GND
+5V DCLEFT YAW DAMPER
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MAINTENANCE MANUAL
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757
MAINTENANCE MANUAL
CDEFGH
J
KL
MNPQRS
T NOTE:EXAMPLE SYSTEM
____ CSEU POWER SUPPLY 2L(THE LEFT SYSTEM IS SHOWN).
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CSEU DC Power Schematic
Figure 5 (Sheet 6)
F09681
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757
MAINTENANCE MANUAL
YAW DAMPER
SPOILER CONT STAB TRIM/ELEV SPOILER CONT RUDDER RATIO SPOILER CONTMODULE 3R ASYM LIMIT 2R CHANGER RIGHT 1R
MODULE RIGHT MODULE R
CSEU Air/Ground and Hydraulic Discrete InputsFigure 6
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MAINTENANCE MANUAL
(3)
Power Supply Module (PSM)
(a)
The PSMs are powered from the airplane 115v ac, 400-Hz power bus. PSM internal monitor circuitry can use either 115v AC or 28 volt DC power to see a module fault.
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