T-45C TS, ADV & IUT ENG-02
Electrical System
II.
Electrical system operational characteristics 1.4.4.2.1,
Sg 2, fr 2
1.4.4.3
Lesson Organization
A.
DC power system: consists of two batteries, generator,
ELECTRICAL SYSTEM
voltage regulator, overvoltage unit, two 28 VDC buses,
* Major component
identification
and undervoltage unit
* Operational
characteristics
1.
Power generation
* Aircraft lighting system
* Aircraft interfaces
a.
Main electrical power supplied by 28 VDC
brushless generator
Sg 2, fr 3 (7 Overlays)
Fig 1: Electrical
(1) During ground starts the GEN WARNING
System Block Diagram
light will extinguish when a suitable DC
output is obtained 25-25.2 VDC (at
Overlay 1
approximately 45% RPM)
Generator
b.
As engine rpm or electrical loads change, the
voltage regulator controls output voltage
Overlay 2
to 28.2-29.2 VDC by adjusting generator
Voltage Regulator
excitation voltage
c.
Overvoltage protection unit monitors generator
Overlay 3
output and prevents voltage from
Overvoltage Unit
exceeding 30.2 VDC by shutting down
generator
d.
If generator goes off-line
(1) MASTER ALERT light flashes
(2) GENERATOR warning light on warning
panel illuminates
(3) Warning tone sounds
NOTE: The MASTER ALERT light and
warning tone may be canceled by pressing
the MASTER ALERT light.
Page 2-9
Change 4 (9-98)
Previous Page
