CORE AS-RDTR 3906103 - Caterpillar

Battery Charger
The XQ power modules utilize a 20 A battery charger to keep the batteries at full charge. The battery charger is only required while the engine is not running. The engine has an on-board alternator that will charge the batteries as the engine runs. However, there is no circuitry that will prevent the battery charger from operating when the engine is running.To maintain the charge for the batteries, operate the engine at regular intervals if there is not enough shore power to operate the battery charger.The battery charger has a three-digit display. The display is used to show DC volts and DC amps. The display will show both the voltage and current readings between the battery and the charger. The display will alternate the readings that are displayed. The voltage will be displayed for 3 seconds and then the current will be displayed for 6 seconds. The display will continue to repeat the voltage and current values.Table 1 lists the battery charger indicator status lights and definitions.
Table 1
Status Light     Problem    
CHGR FAIL (Red)     Battery Charger has failed    
DC HIGH (Red)     Battery DC is too High    
DC LOW (Red)     Battery DC is too Low    
AC FAIL (Red)     AC source input is not connected or not turned on    
T-COMP ACTIVE (Green)     Temperature Compensation is active    
AC/ON (Green)     AC source input is connected    
FLOAT MODE (Green)     Charger Output is in Float Mode    
BOOST MODE (Amber)     Charger Output is in Boost Mode    
BATT FAULT (Red)     Check battery    
When connecting the battery charger, connect the DC leads directly to the battery and not on the switched side of the key switch. If improperly connected, the battery charger could send a surge of current through the control system when the key switch is turned off. The surge would damage the electronic components.
Battery Charger Alarm
Input DI04 is used to connect the battery charger to the DIO module. If "Custom Event #4" appears on the EMCP, the battery charger fail indication is active. One of four alarms can trigger the event:
Battery fault alarm
Charger fail alarm
High battery alarm
Low battery alarmChecking Before Start-Up
Check the battery charger for proper operation. If the batteries are properly charged, the needle of the ammeter will register near "0" (zero).The battery charger must not produce excessive current during start-up. Alternatively, automatically disconnect the charger for start-up. If the engine has an alternator, automatically disconnect the charger during start-up and during engine operation.Charging the Battery
Never disconnect any charging unit circuit or battery circuit cable from the battery when the charging unit is operated. A spark can cause an explosion from the flammable vapor mixture of hydrogen and oxygen that is released from the electrolyte through the battery outlets. Injury to personnel can be the result.
Perform the following procedure to charge the battery:
Ensure that the charger is turned OFF.
Adjust the voltage of the charger in order to match the voltage of the battery.
Connect the