2-11-7. BATT Switch.
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.