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Figure  2-11-2.  Electrical Power Panel
SECTION  XII.  AUXILIARY POWER UNIT

TM-1-1520-240-10 Army CH-47D Heilcopter (EIC:RCD) Manual
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TM  1-1520-240-10            2-11-3/(2-11-4 blank) 2-11-7.  BATT Switch. NOTE The following information applies only if the battery is the only source of power. The BATT (battery) switch is located on the ELEC panel of the overhead switch panel (fig. 2-11-2).The two-posi- tion switch is labeled ON and OFF.When the switch is ON,  the  essential,  switched  battery,  and  hot  battery buses  are  energized.Regardless  of  the  battery  switch position, the switched battery and hot battery buses are powered directly by the battery.To prevent extensive dis- charging of the battery while making extended ground checks of equipment, use an external electrical power source or operate the APU generator. 2-11-8.  RECT OFF Cautions. Two RECT caution capsules labeled  712  NO. 1 RECT OFF and NO. 2 RECT OFF,  714A   RECT 1 and RECT 2  are  on  the  master  caution/advisory  panel  ( 712  fig. 2-14-5,   714A   fig. 2-14-6).These caution capsules are controlled by the reverse-current cutouts.Whenever one of the RECTS fail, either through a fault in the RECT or a bus fault, the respective caution illuminates.Power to operate the transformer rectifier caution capsules is sup- plied  by  the  DC  essential  bus  through  the  LIGHTING CAUTION PNL circuit breaker on the No. 1 PDP. 2-11-9.  BATT SYS MAL Caution. A  battery  system  malfunction  caution  capsule  labeled BATT  SYS  MAL  is  on  the  master  caution  panel  (fig. 2-14-5 and 2-14-6).this caution illuminates when the bat- tery charger has stopped charging the battery.This can be caused by an overheated battery or battery charger, battery cell imbalance, or an output short or open cir- cuit.Power to operate the capsule is supplied by the DC essential bus through the LIGHTING CAUTION PNL cir- cuit breaker on the No. 1 PDP.







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