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E2 rack
These DC generation components are on the E2 rack:
* Transformer rectifier unit 1 (TRU 1)
GUN 001-012, 016-099, 101-110, 115
* Battery charger
GUN 013-015, 111-114, 201-999
* Main Battery Charger
GUN ALL
* Static inverter.
E4 rack
These DC generation components are on the E4 rack:
* Transformer rectifier unit 2 (TRU 2)
* Transformer rectifier unit 3 (TRU 3).
Power Distribution Panels (PDP)
See the AC generation section for more information about the
PDPs. (SECTION 24-20)
DC GENERATION - COMPONENT LOCATION
EFFECTIVITY
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Purpose
The DC generation system makes a nominal 28v dc for airplane
systems.
General
The DC generation system has these components:
* Battery
* Battery charger
* Transformer rectifier units (3).
DC GENERATION SYSTEM - INTRODUCTION
EFFECTIVITY
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General Description
The DC generation system supplies a nominal 28v dc to
different loads. The power source for the DC system is usually
the AC system. The battery supplies power if the AC system is
not available.
Transformer Rectifier Units
To create DC power from the normal AC source, the DC system
uses transformer-rectifier units (TRUs). The three TRUs take
115v ac, decrease the voltage (transforms), and rectify it to a
nominal 28v dc.
GUN 001-012, 016-099, 101-110, 115
Battery Charger
The battery charger gives a DC voltage output to charge the
battery. After it charges the battery, the charger operates like a
TRU. It sends a constant DC voltage to the battery and the hot
and switched hot battery buses.
Battery
The battery is a 48 ampere-hour, nominal 24v dc power source.
It supplies power for APU starting and is a standby power
source if all other power supplies do not operate.
GUN 013-015, 111-114, 201-999
Batteries
Each battery is a 48 ampere-hour, nominal 24v dc power
source. The main battery supplies power for APU starting and is
a standby power source if all other power supplies do not
operate. The auxiliary battery helps the main battery supply
standby power only.
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Control and Protection
The standby power control unit (SPCU), the battery switch, and
the standby power switch give primary control of the DC
system.
The battery switch and the standby power switch give manual
control of power to some DC buses.
The SPCU gives automatic control and protection of DC buses. It
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