STANDBY POWER CONTROL PANEL
A
STATIC INVERTER
TERMINAL COVER
INPUT TERMINALS
FWD
B
Standby Power Component Location
Figure 1 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH 30-MINUTE STANDBY POWER; ú 24-33-00
 ú ú 05 Page 2 ú Jan 20/99
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MAINTENANCE MANUAL

STANDBY POWER
CONTROL PANEL

SEE A
P6 PANEL . AC STANDBY BUS OFF RELAY . AC STANDBY POWER RELAY . DC STANDBY BUS OFF RELAY . EXTENDED STANDBY POWER
INDICATION RELAY . STANDBY POWER RELAY
FLIGHT COMPARTMENT
STATIC INVERTER
SEE B
BAT STBY POWER
AUTO 
ON  OFF  BAT 
OFF 
A  O 
F 
MAIN BAT  APU BAT  F 
DISCH A  ADISCH  A 

STANDBY POWER CONTROL PANEL A
STATIC INVERTER
TERMINAL COVER
INPUT TERMINALS
FWD
B
Standby Power Component Location
Figure 1 (Sheet 2)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH EXTENDED STANDBY POWER; ú 24-33-00
 ú ú 06 Page 3 ú Sep 28/01
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MAINTENANCE MANUAL

 (2)  AIRPLANES WITH 90-MINUTE STANDBY POWER; the standby power control panel, M10062 is located on the pilots' overhead panel P5. The M10062 panel has switches to control the source of standby bus power. Lights on the M10062 panel monitor power on the standby buses and main and APU battery charge status. On some airplanes, the STBY POWER switch must be pushed in before the switch can be moved to OFF.
 C.  AC Standby Power Relay
______________________
 (1)  The AC standby power relay K105 selects either the static inverter or the left main bus to power the AC standby bus. The relay is located in the main power distribution panel, P6.
 D.  Standby Power Relay
___________________
 (1)  The standby power relay K109 controls AC and DC power to the AC and DC standby buses. The standby power relay is in the P6 panel.
 E.  AC and DC Standby Bus Off Relays
________________________________
 (1)  The AC and DC standby bus off relays K138 and K110 provide an unlatched grounded output if bus power is lost. The relays are located in the P6 panel.
 F.  AIRPLANES WITH EXTENDED STANDBY POWER; Main/APU Battery Tie Remote Control Circuit Breaker
___________________________________________________
 (1)  The main/APU battery tie remote control circuit breaker (RCCB) connects the main and APU batteries in parallel and contains logic circuits that inhibit the paralleling function during autoland or when starting the APU.
 G.  AIRPLANES WITH EXTENDED STANDBY POWER; Extended Standby Power Indication Relay
_______________________________________
 (1)  The extended standby power indication relay K10416 functions with the RCCB to provide an EICAS message if the RCCB does not close or open as commanded. Relay K10416 is in the P6 panel.
 H.  AIRPLANES WITH EXTENDED STANDBY POWER; Battery Discharge Indication Inhibit Relay
__________________________________________
 (1)  The battery discharge indication inhibit relay K10422 energizes when the APU is started to inhibit the APU BAT DISCH EICAS message and the APU BAT DISCH light on the standby power control panel. Relay K10422 is on a relay panel in the E6 rack.
 I.  AIRPLANES WITH EXTENDED STANDBY POWER; APU Battery Charger Detection Relay
___________________________________
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 24-33-00
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A

757
MAINTENANCE MANUAL

 (1)  
The APU battery charger detection relay K10418 is controlled by the APU battery current monitor when the STBY POWER switch on standby power control panel is in the AUTO or OFF position. When relay K10418 is energized, the APU battery charger shutdown detection circuit is connected to EICAS. Relay K10418 is on a panel in the E6 rack.
　
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