(b)
A 28VDC/6VDC converter and a 6VDC/115VAC inverter which supplies the loads whenever the essential busbar is energized and the emergency lighting system is activated.
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(c)
A 6VDC battery supplies the loads whenever the system is not selected OFF and the power supply from the essential busbar is not available. The essential busbar charges the battery through the 28VDC/6VDC unit converter. Whenever the ambient temperature falls below +20 DEG. C (68 DEG. F) the 28VDC essential busbar provides electrical heating for the battery. The battery could be replaced without removal of the emergency power-supply unit.
(d)
A test circuit tests the condition of the battery unit, the unit logic and the related loads. The battery test procedure starts after coding selection when the EPSU BAT CAP TEST on the CIDS page of the MCDU/CFDS is selected. If all batteries are serviceable, the TEST OK legend is shown on the MCDU. The system test procedure starts when EPSU SYS TEST on the CICDS page of the MCDU/CFDS is selected. The test circuit carries out an interrogation of the units and monitors the output current. If all units are serviceable the TEST OK legend is shown on the MCDU. This test loop completes only when all unit output currents are within the expected value. An individual test on each emergency power-supply unit must be carried out when the EPSU BAT CAP TEST or the EPSU SYS TEST thru the CFDS/MCDU fails. The isolated test starts when you push the TEST membrane switch on the EPSU. A defective emergency lighting system will cause a red LED on the EPSU to come on. The green LED SYSTEM OK on the EPSU shows a serviceable emergency lighting system. The four red LEDs show the indication of defects:
-
in the exterior lights (external loads),
-
in the interior lights (internal loads),
-
in the battery,
-
in the unit.
Each output has its own fuse. The fuses are installed in the
EPSU.
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R **ON A/C 401-499,
R (Ref. Fig. 012A)
R A. Emergency Power-Supply Unit
R The emergency power-supply units supply different lights. These lights
R are exit signs, cabin emergency lights, overwing emergency lights, escape
R hatch handle lights, escape slide lights and floor proximity lights.
R (1) The emergency power-supply unit consists of:
R (a) Electronic logic and switching circuits.
R (b) A 28VDC/6VDC converter which supplies the loads whenever the
R essential busbar is energized and the emergency lighting system
R is activated.
R (c) A 6VDC battery supplies the loads whenever the system is not
R selected OFF and the power supply from the essential busbar is
R not available. The essential busbar charges the battery through
R the 28VDC/6VDC unit converter. Whenever the ambient temperature
R falls below +20 DEG. C (68 DEG. F) the 28VDC essential busbar
R provides electrical heating for the battery. The battery could be
R replaced without removal of the emergency power-supply unit.
R (d) A test circuit tests the condition of the battery unit, the unit
R logic and the related loads. The battery test procedure starts
R after coding selection when the EPSU BAT CAP TEST on the CIDS
R page of the MCDU/CFDS is selected. If all batteries are
R serviceable, the TEST OK legend is shown on the MCDU.
R The system test procedure starts when EPSU SYS TEST on the CICDS
R page of the MCDU/CFDS is selected. The test circuit carries out
R an interrogation of the units and monitors the output current.
R If all units are serviceable the TEST OK legend is shown on the
R MCDU. This test loop completes only when all unit output currents
R are within the expected value. An individual test on each
R emergency power-supply unit must be carried out when the EPSU BAT
R CAP TEST or the EPSU SYS TEST thru the CFDS/MCDU fails.
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