T-45A UJPT, E2-C2, ADV, & IUT Eng-07
Electrical
D.
Fault protection analysis
Sg 2, fr 5
(6 Overlays)
1.
Generator failure: may be mechanical in
nature, but malfunctions can be described
as either undervoltage or overvoltage
condition
a.
Undervoltage: if voltage on 28 VDC
generator bus falls below 25 volts for
ELECTRICAL SYSTEM BLOCK
more than 1.5 seconds, undervoltage
DIAGRAM
unit
Overlay 1
(1) Secures the generator by way of
Undervoltage Condition
a generator fail relay (changeover
relay) (GENERATOR warning light
illuminates)
(2) With AFC 199 installed,
disconnects 26 and 115 VAC
nonessential buses from the
inverters, removing all
nonessential AC loads
(3) Prior to AFC 199 installation
(a) Removes the SLAVE inverter
from service (AC INVERTER
caution light illuminates), and
(b) Removing power from 26 and
115 VAC nonessential buses
thus removing all nonessential
AC loads
NOTE: On start, first inverter
up and running is the
MASTER, slower starting
inverter is the SLAVE.
(4) Signal CWS
(a) MSTR ALERT flashes
(b) Warning tone sounds
Page 7-12
(8-03) Original
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