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ELECTRICAL SYSTEM (24VDC NON-PROPULSION)
24VDC ELECTRIC SUPPLY SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D2-1
24VDC ELECTRICAL SYSTEM COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D3-1
BATTERY CHARGING ALTERNATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D10-1
VHMS COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D11-1
VHMS SOFTWARE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D12-1
VHMS CHECKOUT AND TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D13-1
VHMS FORMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D14-1
NOTE: Electrical system wiring hookup and electrical schematics are located in Section R of this manual.
DANGEROUS VOLTAGE LEVELS ARE PRESENT WHEN THE TRUCK IS RUNNING AND CONTINUE
TO EXIST AFTER SHUTDOWN IF THE REQUIRED SHUTDOWN PROCEDURES ARE NOT FOL-
LOWED. Before attempting repairs or working near propulsion system components, the following
precautions and truck shutdown procedure must be followed:
DO NOT step on or use any power cable as a handhold.
•
Never open any electrical cabinet covers or touch the retarding grid elements. Additional pro-
•
cedures are required before it is safe to do so. Refer to Section E for additional propulsion
system safety checks to be performed by a technician trained to service the system.
ALL removal, repairs and installation of propulsion system electrical components, cables etc.
•
must be performed by an electrical maintenance technician properly trained to service the
system.
In the event of a propulsion system malfunction, a qualified technician should inspect the
•
truck and verify the propulsion system does not have dangerous voltage levels present
before repairs are started.
Prior to welding on the truck, maintenance personnel should attempt to notify the Komatsu
•
Factory Representative. The welding ground electrode should be attached as close as possi-
ble to the area to be welded. Never weld on the rear of the electrical control cabinet or the
retard grid exhaust air louvers.
After the truck is parked in position for the repairs, the truck must be shut down properly to ensure the
safety of anyone working in the areas of the deck, electrical cabinet, traction motors, and retarding grids.
The following procedure will ensure that the electrical system is properly discharged before repairs are
begun.
D01039
SECTION D
INDEX
Index
D1-1
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