(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 inverter.

 (b)
 A 9.6VDC/115VAC inverter which supplies the loads.

 (c)
 A 9.6VDC battery which supplies the inverter. The 28VDC essential busbar charges the battery, controlled by the logic circuit, whenever aircraft power or ground power is available.

 **ON A/C 004-049, 101-105, 151-158, 201-209,
 (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.
R 1EFF : 001-049, 101-105, 151-158, 201-209, 1 33-51-00Page A11 1 1 Aug 01/05 1 1 1CES 1

 Emergency Power-Supply Unit
 Figure 012A

R 1EFF : 004-049, 053-099, 101-149, 151-199, 1 33-51-00Page A12 1201-299, 301-399, 401-499, 1Aug 01/05 1 1 1CES 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.

 (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.

R 1EFF : 004-049, 101-105, 151-158, 201-209, 1 33-51-00Page A13 1 1 Aug 01/05 1 1 1CES 1

 (2) Three power supply units 110WL1 thru 110WL3. They supply different lights and signs:
 -wall-mounted exit-marking signs,
 -floor-proximity emergency-escape-path marking-lights.
 Each power supply unit consists of the subsequent:
 (a)
 An electronic logic circuit which controls the inverter.

 (b)
 A 9.6VDC/115VAC inverter which supplies the loads.

 (c)
 A 9.6VDC battery which supplies the inverter. The 28VDC essential busbar charges the battery, controlled by the logic circuit, whenever aircraft power or ground power is available.

 **ON A/C 051-052,
 (Ref. Fig. 012)
 A. Emergency Power Supply-Units and Power Supply Units
 There are two types of power supply units supplying different lights. They are:
 (1) Four emergency-power supply units 10WL thru 13WL supply:
 -
The cabin emergency lights,

 -
The exit signs,

 -
The overwing emergency lights,

 -
The escape slide lights,

 -
The escape hatch-handle lights.
 Each emergency power-supply unit consists of:
　
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