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AC GENERATION - AC SYSTEMS, GENERATOR, AND APU PANEL - INDICATION
EFFECTIVITY
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AC GENERATION - AC SYSTEMS, GENERATOR, AND APU PANEL - INDICATION
AC GENERATION - AC SYSTEMS, GENERATOR, AND APU PANEL - INDICATION
EFFECTIVITY
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Purpose
DC generation makes and controls 28v dc power for use by
airplane systems.
General
DC generation has these sub-systems:
* DC generation system
* Standby power system.
DC GENERATION - INTRODUCTION
EFFECTIVITY
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EFFECTIVITY
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General
The DC power system is a two-wire system that operates at 28
volts (nominal). The DC system has these power sources:
* Three transformer rectifiers units (TRUs)
* Battery charger
* Battery.
The TRUs are the normal power source for the DC power
system. The TRUs change 115v ac, 3-phase power to
unregulated 28v dc. Each TRU can supply up to 75 amps
when airplane cooling air is available. The TRUs are connected
in parallel to give back-up to each other.
TRU 1 gets power from the AC transfer bus 1. TRU 1 output
connects directly to DC bus 1.
TRU 2 gets power from the AC transfer bus 2. TRU 2 output
connects directly to DC bus 2.
TRU 3 usually gets power from AC transfer bus 2. AC transfer
bus 1 supplies back up power through R622 if normal power is
lost. The primary use of TRU 3 is as a power source for the
battery bus.
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The battery charger gets power from the AC ground service bus
2. Ground service bus 2 gets power from AC transfer bus 2. The
battery charger is the primary power supply for the hot and
switched hot battery bus.
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Control
These switches and components control the relays in the DC
distribution:
* Standby power control unit (SPCU)
* Bus power control unit (BPCU)
* Battery switch
* Standby power switch.
Standby Power Control Unit (SPCU)
The SPCU gives manual and automatic control of most relays in
DC distribution.
The SPCU uses the battery and standby power switch positions
to control relays. The SPCU also monitors AC and DC bus
power to control relays for primary and secondary power
source selection.
These relays are inside the SPCU:
* Battery bus normal relay (K2)
DC GENERATION - DISTRIBUTION AND CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
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* Battery bus alternate relay (K1)
* Standby normal relay (K5)
* Standby DC alternate relay (K3)
* Switched hot battery bus relay (K8).
Bus Power Control Unit (BPCU)
The BPCU controls the ground service relay. See the external
power section for more information.
Battery Bus Normal Relay (K2)
The battery bus normal relay (K2) energizes to let the battery
bus get power from TRU 3.
Battery Bus Alternate Relay (K1)
The battery bus alternate relay (K1) energizes to let the battery
bus get power from the battery or the battery charger. The relay
energizes when these conditions are true:
* Battery switch is in the ON position
　
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