Description (AMM 24-55-00)

 

A- The nickel-cadmium battery is in the electronic compartment near shelf E3.           

 

B- AIRPLANES WITH 2 BATTERIES; The APU battery is in electronic compartment forward of the shelf E3.

 

Operation (AMM 24-55-00)

 

The battery is the alternative source of power to the battery bus. Battery bus control is automatic with manual override. Regardless of battery bus source or control, the battery switch must be set to ON to power the battery bus.

 

(1) If the 115-volt ac bus 2 is energized, and the battery switch is set to ON, T-R 3 input relay R329 and battery transfer relay R2 will be energized. Relay R329 provides a path for input power to T-R 3 and relay R2 disables relay R1. T-R 3 provides power to battery bus.

 

(2) If T-R 3 should lose output power, relay R2 is de-energized and relay R1 is energized. The battery provides power to battery bus through relay R1.

 

(3) Manual control of the battery bus is from the standby power switch. Setting the switch to BAT energizes relay R326. The battery provides power to the battery bus through relay R326.

 

(4) AIRPLANES WITH 2 BATTERIES;

When TR3 goes dead or the STANDBY POWER switch is set to BAT, the dual battery RCCB closes. This connects the two batteries together and they supply power to the battery bus in parallel.

 

The battery provides power to the switched hot battery bus when the battery switch is set to ON. Generator power control relay R41 energizes when the battery switch is set to ON and completes the circuit from the battery to the switched hot battery bus.