(b)
 A 28VDC/6VDC converter and a 6VDC/115VAC inverter 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.

R 1EFF : 159-199, 210-228, 1 33-51-00Page A19 1 1 Aug 01/05 1 1 1CES 1 You must do isolated tests of each EPSU when either the BAT OK or SYS OK annunciator light does not come on. 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.

 **ON A/C 229-299,
 (Ref. Fig. 012A)
 A. Emergency Power-Supply Units
 The EPSUs supply different lights and signs:
 -cabin emergency lights,
 -escape hatch-handle lights,
 -
exit location signs,

 -
exit marking signs,

 -wall-mounted exit-marking signs,
 - overwing emergency lights,

 -escape slide lights.
 (1) 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.

R 1EFF : 159-199, 210-299, 1 33-51-00Page A20 1 1 Aug 01/05 1 1 1CES 1

 (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. You must do isolated tests of each EPSU when either the BAT OK or SYS OK annunciator light does not come on. 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.

 **ON A/C 301-302,
 (Ref. Fig. 012A)
　
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