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DIRECT CURRENT (DC) POWER  DISTRIBUTION SYSTEM (Continued) - TM-55-1520-240-23-7_399
DIRECT CURRENT (DC) POWER DISTRIBUTION SYSTEM     (Continued)

TM-55-1520-240-23-7 CH-47D Heilcopter Manual
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TM 55-1520-240-23-7 9-1 DIRECT CURRENT (DC) POWER DISTRIBUTION SYSTEM     (Continued) 9-1 EXTERNAL POWER When external dc power is applied to the helicopter, dc external power control relay 161K9 is energized.  This disconnects the No.  1 and No.  2 transformer-rectifiers from their respective buses by de-energizing their respective RCCO relays.  The energized power control relay also lights the EXT PWR light on the master caution panel. At the same time, dc external power relay 161K7 is energized to connect 24 vdc from the external source to the No.  1 dc bus.  This energizes relay 161K2, applying power to the essential dc bus, bus tie relay 161K8, powering the No.  2 bus, and energizes relay 161K10, applying power to the switched battery bus. 9-16 Change 1







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