(a)
Electronic logic and switching circuits.
(b)
A 28VDC/6VDC converter which supplies electrical power when the essential busbar is energized and the emergency lighting system is activated.
(c)
A 6VDC battery supplies the loads when the system is not set to OFF and the power supply from the essential busbar is not available. The essential busbar charges the battery through the 28VDC/6VDC converter. When the ambient temperature is less than +20 deg. C (68 deg. F), the 28VDC essential busbar provides electrical heating for the battery. You can change the battery without removal of the emergency power-supply unit.
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(d) A test circuit tests the condition of the battery unit, the logic unit and the related loads. The battery test procedure starts after code selection when the TEST EMER LIGHT BAT membrane switch on the programming and test panel 110RH (CIDS) is pushed. If all batteries are serviceable, the BAT OK annunciator light adjacent to the membrane switch comes on. The system test procedure starts when you push the TEST EMER LIGHT SYS membrane switch on the programming and test panel 110RH. The test circuit carries out an interrogation of the units and monitors the output current. If all units are serviceable, the SYS OK annunciator light adjacent to the membrane switch comes on. This test loop completes only when all unit output currents are within the expected value. You must do isolated tests of each emergency power-supply unit when either the BAT OK or SYS OK annunciator light does not come on. The isolated test starts when the pushbutton switch on the emergency power-supply unit is pushed. A defective emergency power-supply unit will cause a red LED on it to come on. A green LED shows a serviceable emergency power-supply unit. There are three pairs of red and green LED. One pair provides indication of defects in the external laods. One pair provides indication of defects in the internal loads. One pair provides indication of defects in the battery. Each output has its own fuse. The fuses are installed on the top of the emergency power-supply unit.
(2) Three power supply units 110WL1 thru 110WL3 supply:
-
The floor-proximity emergency-escape-path marking-lights,
-
The wall-mounted exit-marking signs.
Each power supply unit consists of:
(a)
An electronic logic circuit which controls the converter.
(b)
A 28VDC/6VDC converter, which supplies the loads.
(c)
A 6VDC battery supplies the loads whenever the emergency system is not set to OFF and the power supply from the essential busbar 801PP is not available. The essential busbar charges the battery through the 28VDC/6VDC converter.
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**ON A/C 053-099,
(Ref. Fig. 012A)
A. Emergency Power-Supply Units and Power Supply Units
There are two types of power supply units:
(1) Four EPSUs 10WL thru 13WL. They supply different lights and signs:
-cabin emergency lights,
-escape hatch-handle lights,
-
exit location signs,
-
exit marking signs,
- overwing emergency lights,
-escape slide lights.
Each EPSU consists of the subsequent:
(a)
Electronic logic and switching circuits.
(b)
A 28VDC/6VDC converter which supplies electrical power when the essential busbar is energized and the emergency lighting system is activated.
(c)
A 6VDC battery supplies the loads when the system is not set to off and the power supply from the essential busbar is not available. The essential busbar charges the battery through the 28VDC/6VDC converter. When the ambient temperature is less than +20 deg.C (+68.00 deg.F), the 28VDC essential busbar provides electrical heating for the battery. You can change the battery without removal of the EPSU.
(d)
A test circuit tests the condition of the battery, the logic unit and the related loads. The battery test procedure starts when you push the TEST EMER LIGHT BAT membrane switch and when you select a code on the programming and test panel 110RH (CIDS). If all batteries are serviceable, the BAT OK annunciator light adjacent to the membrane switch comes on. The system test procedure starts when you push the TEST EMER LIGHT SYS membrane switch on the programming and test panel 110RH. The test circuit carries out an interrogation of the EPSUs and monitors the output current. If all EPSUs are serviceable, the SYS OK annunciator light adjacent to the membrane switch comes on. This test loop completes only when all EPSU output currents are within the expected value.
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