STBY BATT Switch ( two positions )

STBY BATT - left main feeder bus charging circuit connected to standby battery

OFF - disconnects standby battery from left main feeder bus

• STBY BATTERY caution light turns on any time the standby battery is not connected to the left main feeder bus

AUX BATT Switch ( two-position )

AUX BATT - left main feeder bus charging circuit connected to the auxiliary battery

OFF - disconnects the auxiliary battery from left main feeder bus

• AUX BATTERY caution light turns

MAIN BATT Switch ( two position )

MAIN BATT - right main feeder bus charging circuit connected to the main battery

OFF - disconnects the main battery from right main feeder bus

• MAIN BATTERY caution light

BATTERY MASTER Switch ( two position, lever locked at OFF )

BATTERY MASTER

• any battery is capable of powering both essential buses
• switch control is hard-wired and independent of EPCU operation

OFF - disconnects the main, auxiliary, and standby batteries from the associated essential buses NOTE: The battery master switch must be selected to BATTERY MASTER before

GEN 1 and 2 Switches ( two position )

GEN 1 OR 2 - DC GCU permits the generator to supply power to the associated feeder bus

• DC generators are inhibited with DC EXT PWR ON

OFF - shuts associated generator off

• resets GCU for subsequent generator and circuit monitoring following the shutdown of a generator
• DC GEN 1 or 2 caution light turns on

MAIN BUS TIE Switch ( two position, lever locked at OFF )

MAIN BUS TIE - manually ties left and right main feeder buses.

• EPCU inhibits bus tie operation upon detection of a bus fault

OFF - manually opens the connection between the left and right main feeder buses