T-45C TS, ADV & IUT ENG-02
Electrical System
2.
Normal operations: external power contactor routes
external power to 28 VDC generator bus and
disables centralized warning system (CWS) (when
fuel shutoff handle is pulled) with exception of
a.
Warning tone trigger
b.
MASTER ALERT
c.
FIRE
Sg 2, fr 15
(6 Overlays)
Fig 1: Electrical
d.
GTS FIRE
System Block Diagram
D.
Fault protection analysis
Overlay 1
1.
Generator failure: any malfunction may be
Undervoltage
described as either an overvoltage or undervoltage
Condition
condition
a.
Overvoltage: if the generator voltage exceeds
30.2 VDC, the overvoltage relay takes the
generator off-line and all voltage is lost to the
generator bus resulting in the following:
(1) Disconnects 26 and 115 VAC non-essential
buses from inverters, removing all non-
essential AC loads
(a) HUD and right MFD in both cockpits
are disconnected
(b) Left MFD in both cockpits revert to ADI
display
NOTE: After 2 minutes, a relay drops
power to the left MFD in both cockpit,
DEU, SADS, and VCR/CEU.
(2) On aircraft 65456 and below without AFC
199 -- one inverter disconnected to
conserve battery power, illuminating AC
INV caution light
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Change 4 (9-98)
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