T-45C TS, ADV & IUT ENG-27/ENG-28
Engineering Review
b.
Distribution
Sg 5, fr 15
Generator Bus
(1) 28 VDC generator bus supplies non-
essential services
Sg 5, fr 16
(2) 28 VDC essential services bus links to
28 VDC Essential
28 VDC generator bus through two
Services Bus
power isolation diodes and supplies
power for charging batteries
c.
Battery operations
Sg 5, fr 17
(1) Two 24 volt, 18 AH lead acid batteries
Batteries
supply power to essential services bus
providing DC power during engine start
and emergency voltage to 28 VDC
essential services bus with generator
failure
(2) Battery #1 supplies power to ground
Sg 5, fr 18
services bus
Ground Service Bus
2. AC power system: consists of two identical 26/115
Sg 5, fr 19
VAC, 400 Hz single phase inverters, two 26 VAC
Electrical System
buses, and two 115 VAC buses
Block Diagram
a.
26 and 115 VAC power developed by two
identical inverters powered by 28 VDC essential
Sg 5, fr 20
Inverters
services bus
b.
Inverters are internally protected for input or
output faults
(1) Automatically reset when input fault clears
(2) Require manual reset for output fault
Sg 5, fr 21
c.
26 and 115 VAC essential buses provide
26/115 VAC Essential
distribution for AC essential services
Services Buses
d.
26 and 115 VAC non-essential buses provide
Sg 5, fr 22
distribution for non-essential services
Non-Essential AC
Buses
e.
When generator is off-line, 26 and 115 VAC
non-essential buses are taken off-line
f.
Two 6 VAC buses provide distribution from
115 VAC essential and non-essential buses to
wing navigation and formation lights
(9-98) Original
Page 27-11
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