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DIRECT CURRENT (DC) POWER  DISTRIBUTION SYSTEM (Continued) - TM-55-1520-240-23-7_398
DIRECT CURRENT (DC) POWER DISTRIBUTION SYSTEM (Continued) EXTERNAL POWER

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 BATTERY When the battery is connected,  24 vdc  is supplied directly to the battery bus.  In addition, if the No.  1 dc bus is not powered, the battery provides  24 vdc  to the switched battery bus through switched battery bus relay 161K10.  If the cockpit battery switch is on,  24 vdc  is also provided to the essential dc bus through battery bus relay 161K1 and essential dc bus relay 161K2. BATTERY CHARGER When power is applied to the No.  1 ac bus the charger will charge the battery if there are no malfunctions in the system.  It is a constant current charge (10-11 amps) and will continue until battery is more than  80 percent charged.  At this point, the charger drops to very low current (0.04 amp).  Normal charge (10-11 amps) will not start again until the battery voltage drops below approximately  80 percent  of rated capacity. The charger also has provision for low current charging (1.5 amp) for deeply discharged batteries.  A charger failure will not damage or discharge the battery. The charger can detect a battery overtemperature condition and will stop charging.  Charging will not start again until battery cools and charger is manually reset or power is cycled off and on.  The charger will operate at any frequency between  380 and 440 Hz. Change 1 9-15







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