SECTION 2 - SERVICE PROCEDURE
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2-1
SECTION 2. SERVICE PROCEDURE
2.1
12V DC POWER DISTRIBUTION
The 12V power distribution system provides the electrical
power required to operate the machine’s Electronic con-
trol modules (ECM), solenoid valves and lights. In Lithium
ION 2nd Generation BMS powered machines, it also pow-
ers the battery management system (BMS) and Lithium
ION system relays and contactors. In engine powered
machines, the 12V power distribution system powers the
glow plugs in diesel engines and the starter motor in die-
sel and gasoline engines. The 12V Power distribution sys-
tem includes the following components:
•
12 Volt Lead-acid battery
•
12 Volt battery cutouts
•
12 Volt battery fuses
•
Machine master controller (ECM1 and ECM2)
•
Load Cell Board (ECM3)
•
Reduced Stabilization Control Board (ECM4) X770AJ/
X26JP only
•
Battery management system (BMS)
•
Start relay
•
Starter
•
Glow plug relay
•
Glow plugs
•
Generator
The 12V Lead-acid battery provides the power to the
machine electronic control module (ECM) in the machine
until the engine starts. Once the engine starts, the engine
driven generator, provides 13.5V electrical power for the
machine components and recharges the battery.
When the engine is not running, connect 120/230V AC
power cord into a power receptacle to recharge the bat-
tery.
When the Battery Management System (BMS) is ON, the
DC-DC converter also switches ON. When this occurs, the
DC-DC converter powered by the Lithium ION battery,
provides 12V electrical power for the machine compo-
nents. It also recharges the battery.
When the machine’s Lithium ION battery system is charg-
ing the DC-DC converter continues to recharge the 12V
Lead-acid battery.
If the Lead-acid battery is completely discharged, the
main controller and the BMS cannot be powered and
machine cannot start. To avoid this situation, if the Lith-
ium ION battery ON-OFF key switch is left on, and the volt-
age level of the Lithium ION battery pack is less than 20%,
the master controller will turn off the system if no machine
movements are performed for one hour.
Even if the operator leaves the Lithium ION battery ON-
OFF key switch in ON position, the Lead-acid battery will
be preserved from complete discharge.
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