TM 55-1520-240-23-7
9-30
ALTERNATING CURRENT (AC) POWER DISTRIBUTION
(Continued)
9-30
NORMAL OPERATION
When both main generator switches (GEN NO. 1 and
GEN NO. 2) on the overhead ELECT panel are set
to ON, 28 vdc is applied to each generator contactor
241K1 and 241K2 in the respective PDP. At the same
time, 28 vdc from the essential bus is applied to APU
generator contactor 241K3 in the No. 2 PDP, and
external power contactor 241K5 in the No. 1 PDP. This
makes voltage available at the crosstie circuits so that
if one generator fails, its bus will be supplied by the
operating generator.
NO BREAK - WORK HARDER
If either main generator fails or is shut down, the
associated NO. 1 or NO. 2 GEN OFF light on the master
caution panel will come on.
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