Description (AMM 24-31-00)

 

The battery charger is a regulated system to charge nickel-cadmium storage batteries. It operates from 115-volt, 400-Hz, 3-phase power.

 

AIRPLANES WITH 36AH OR 38AH SMALL BATTERY

The battery charger is on shelf E3-1 in the electronic compartment. The battery charger is capable of charging a completely discharged battery to 100 percent charge state within 1 hour. After the battery is completely recharged, the charger will count and limit the pulse charge to eight pulses. At the end of eight pulses, the charger will switch to a constant potential mode to maintain the battery at a 100 percent state-of-charge without undue gassing or overheating of the battery.

 

AWW SE-DNC

The main and APU battery chargers are on shelf E3-1 in the electronic compartment. Each battery charger is capable of charging a completely discharged battery to 100 percent charge state within 1 hour. After the battery is completely recharged, the charger will count and limit the pulse charge to eight pulses. At the end of eight pulses, the charger will switch to a constant potential mode to maintain the battery at a 100 percent state-of-charge without undue gassing or overheating of the battery.

 

AIRPLANES WITH THE 40AH BATTERY

The battery charger is on shelf E3-1 in the electronic compartment. The battery charger is capable of charging a completely discharged battery to 100 percent charge state within 75 minutes. The battery charger operates in the charge mode or in the transformer-rectifier (T-R) mode.

 

(1) In the transformer-rectifier (T-R) mode, the charge provides 28v dc to maintain battery charge, and meets load demands on the battery bus. Internal current limiting circuitry reduces the output voltage to limit current to 60 amps.

 

(2) In the charge mode, the battery charger delivers a constant current of 38 amps to the battery. The output voltage will vary with battery state-of-charge and load resistance. When battery voltage reaches a threshold voltage, charging stops. The threshold voltage is automatically temperature adjusted by a temperature sensor in the battery.

 

(3) The battery charger works with battery's temperature sensor and interlock to prevent battery damage. Charging stops if battery temperature is outside the range, or if the battery is disconnected.

 

AIRPLANES WITH 1 BATTERY

The battery charger will switch to the constant potential mode when the mode control loop is opened by any of the following.

 

AIRPLANES WITH 2 BATTERIES

The battery chargers will change to the constant voltage mode and the dual battery RCCB will close when one of these conditions occurs:

 

(1) Auxiliary relay to bat bus relay R327 de-energizes due to loss of  T-R 3 output.

 

(2) Standby power relay manual R328 energizes when STANDBY POWER switch is set to BAT.

 

(3) AIRPLANES WITH LARGE BATTERY AND PRIOR TO LINE NUMBER 2247

Ground refueling power select relay R10 energizes when ac external power is connected to the external power receptacle.

 

AIRPLANES WITH 1 BATTERY

Input power to the battery charger is from 115-volt ac ground service bus or, if this bus loses power, from the 115-volt ac main bus 2.

 

AIRPLANES WITH 2 BATTERIES

Input power to the two battery chargers is from 115-volt ac ground service bus or, if this bus loses power, from the 115-volt ac main bus 2.

 

AIRPLA