Battery Supply System; 24Vdc Battery Charging Alternator; Battery Box; Battery Control Box - Komatsu 930E-2 Shop Manual

BATTERY SUPPLY SYSTEM

24VDC BATTERY CHARGING ALTERNATOR

Refer to Optional Equipment, Section "M" for informa-
tion regarding the truck battery charging alternator.

BATTERY BOX

The truck batteries are located in an enclosure (1,
Figure 2-1) in the center of the truck behind the front
bumper. For access to the batteries, remove the two
covers by turning the cover handles counterclockwise
until released. Lift eyes are attached to the ends of the
enclosure if the entire battery container must be re-
moved.
Four Type 8D batteries (2) are installed in the battery
box and are used for the 24VDC engine cranking circuit
and the 12VDC circuits. Two Type 4D batteries (3) are
installed to provide 24VDC for the truck systems other
than engine starting. A System Battery Starter Discon-
nect Relay isolates these batteries from the engine
starter circuit during engine cranking.
1. Battery Box
2. Engine Cranking Batteries
D02018
FIGURE 2-1. BATTERY BOX AND BATTERY CONTROL BOX
24VDC Electric Supply System

BATTERY CONTROL BOX

The battery control box (4) is located near the right
corner of the front bumper. This box contains the
battery disconnect switches and other components
listed below.
System Battery Starter Disconnect Relay
The System Battery Starter Disconnect Relay (7, Figure
2-2) isolates the engine cranking circuit, when the
starter is actuated, from the system battery circuits to
ensure the high current demand in the starter circuit
does not affect the control system circuits.
When the operator turns the keyswitch to the start
position, a signal is sent from the keyswitch to the Truck
Control Interface (TCI) located in the Electrical Inter-
face Cabinet. If all conditions required to engage the
starter are acceptable, the TCI panel provides a signal
to energize the System Battery Starter Disconnect
Relay, disconnecting the system batteries from the
start circuit until the cranking sequence is completed
and cranking battery voltage returns above a pro-
grammed voltage.
3. System Batteries
4. Battery Control Box
D2-3