24VDC ELECTRIC SUPPLY SYSTEM
ELECTRICAL SYSTEM DESCRIPTION
The Komatsu truck utilizes a 24VDC electrical system
which supplies power for engine starting circuits and
most non-propulsion electrical components. The
24VDC engine starting circuit is supplied by four, heavy
duty Type 8D, 12 volt storage batteries. Several com-
ponents require 12VDC and are supplied by circuits
tapped off the starting batteries. Two, smaller, 12VDC
batteries (Type 4D) supply 24VDC for the non-propul-
sion components; Engine Control System, circuit re-
lays, indicator lamps, etc.
The batteries are of the lead-acid type, each containing
six 2-volt cells. With the engine “Off”, power is supplied
by batteries. During engine cranking, power is supplied
by the four engine cranking batteries only. When the
engine is running, power is supplied by an engine
driven high capacity alternator.
Lead-acid storage batteries contain sulphuric acid,
which if handled improperly may cause serious
burns on skin or other serious injuries to person-
nel. Wear protective gloves, aprons and eye pro-
tection when handling and servicing lead–acid
storage batteries. See the precautions in Section
“A” of this manual to insure proper handling of
batteries and accidents involving sulphuric acid.
During operation, the storage batteries function as an
electrochemical device for converting chemical energy
into the electrical energy required for operating the
accessories when the engine is shut down.
BATTERIES
Maintenance and Service
The electrolyte level of each cell should be checked at
the interval specified in the Lubrication and Service
Section “P”, and water added if necessary. The proper
level to maintain is
3
⁄
8
–
1
⁄
2
in. (10-13 mm) above the
plates. To insure maximum battery life, use only dis-
tilled water or water recommended by the battery
manufacturer. After adding water in freezing weather,
operate the engine for at least 30 minutes to thoroughly
mix the electrolyte.
DO NOT SMOKE or allow flame around a dead
battery or during the recharging operation. The
expelled gas from a dead cell is extremely explo-
sive.
Excessive consumption of water indicates leakage or
overcharging. Normal water usage for a unit operating
eight hours per day is about one to two ounces per cell
per month. For heavy duty operation (24 hour) normal
consumption should run about one to two ounces per
cell per week. Any appreciable increase over these
figures should be considered a danger signal.
Troubleshooting
Two most common troubles that occur in the charging
system are undercharging and overcharging of the
truck’s batteries.
An undercharged battery is incapable of providing
sufficient power to the truck’s electrical system.
Some possible causes for an undercharged battery
are:
Sulfated battery plates
Loose or corroded battery connections
Defective wire in electrical system
Loose alternator drive belt
A defective alternator
Overcharging, which causes overheating, is first indi-
cated by excessive use of water. If allowed to continue,
cell covers will push up at the positive ends and in
extreme cases the battery container will become dis-
torted and cracked.
Leakage can be detected by continual wetness of the
battery or excessive corrosion of the terminals, battery
carrier and surrounding area. (A slight amount of cor-
rosion is normal in lead–acid batteries). Inspect the
case, covers and sealing compound for holes, cracks
or other signs of leakage. Check battery hold down
connections to make sure the tension is not great
enough to crack the battery, or loose enough to allow
vibration to open the seams. A leaking battery should
be replaced.
D02018
24VDC Electric Supply System
D2-1
Содержание 930E-2
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Страница 8: ...KOMATSU MODEL 930E Dump Truck A 4 Introduction A00017 03 01 ...
Страница 10: ...NOTES A1 2 Index A01001 2 94 ...
Страница 12: ...930E MAJOR COMPONENTS A2 2 Major Component Description A02055 ...
Страница 35: ...START HERE Walk Around Inspection A03017 General Safety and Operating Instructions A3 21 ...
Страница 46: ...NOTES A3 32 General Safety and Operating Instructions A03017 ...
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Страница 88: ...NOTES B3 6 Dump Body B03013 03 01 ...
Страница 92: ...NOTES B4 4 Fuel Tank B04015 ...
Страница 94: ...NOTES C1 2 Index C01021 03 01 ...
Страница 118: ...NOTES C5 6 Air Filtration System C05013 5 98 ...
Страница 126: ...NOTES D2 6 24VDC Electric Supply System D02018 ...
Страница 142: ...NOTES D3 16 24VDC System Components D03019 04 01 ...
Страница 146: ...FIGURE 2 1 PROPULSION SYSTEM DIAGRAM E2 2 Electrical Propulsion System Components E02014 3 01 ...
Страница 191: ...FIGURE 2 3 ELECTRICAL CABINET FRONT VIEW E02014 3 01 Electrical Propulsion System Components E2 47 ...
Страница 192: ...FIGURE 2 4 ELECTRICAL CABINET TOP VIEW E2 48 Electrical Propulsion System Components E02014 3 01 ...
Страница 193: ...FIGURE 2 5 ELECTRICAL CABINET REAR FLOOR VIEW E02014 3 01 Electrical Propulsion System Components E2 49 ...
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Страница 240: ...NOTES E3 44 AC Drive System Electrical Checkout Procedure 3 01 E03015 Release 17 Software ...
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Страница 250: ...NOTES G2 8 Tires and Rims G02015 ...
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Страница 282: ...NOTES H2 8 Front Suspensions H02013 2 01 ...
Страница 288: ...NOTES H3 6 Rear Suspensions H03013 ...
Страница 334: ...NOTES J3 32 Brake Circuit Component Service J03019 1 99 ...
Страница 378: ...NOTES L2 8 Hydraulic System L02028 ...
Страница 401: ...FIGURE 4 5 FLOW AMPLIFIER VALVE L04031 Steering Circuit L4 7 ...
Страница 403: ...FIGURE 4 6 FLOW AMPLIFIER NO STEER L04031 Steering Circuit L4 9 ...
Страница 405: ...FIGURE 4 7 FLOW AMPLIFIER LEFT STEER L04031 Steering Circuit L4 11 ...
Страница 407: ...FIGURE 4 8 FLOW AMPLIFIER RIGHT STEER L04031 Steering Circuit L4 13 ...
Страница 409: ...FIGURE 4 9 FLOW AMPLIFIER NO STEER EXTERNAL SHOCK LOAD L04031 Steering Circuit L4 15 ...
Страница 414: ...NOTES L4 20 Steering Circuit L04031 ...
Страница 422: ...NOTES L5 8 Steering Control Unit L05021 ...
Страница 429: ...L06021 Steering Circuit Component Repair L6 7 ...
Страница 450: ...NOTES L6 28 Steering Circuit Component Repair L06021 ...
Страница 466: ...NOTES L7 16 Hoist Circuit L07023 ...
Страница 492: ...NOTES L9 6 Hydraulic System Filters L09008 ...
Страница 504: ...NOTES L10 12 Hydraulic Check out Procedure L10012 ...
Страница 508: ...NOTES M1 2 Index M01034 03 01 ...
Страница 518: ...NOTES M2 3 10 Ansul Checkfire Electric Detection and Actuation System M02003 ...
Страница 524: ...NOTES M5 4 Wiggins Quick Fill Fuel System M05002 10 96 ...
Страница 532: ...NOTES M8 8 Special Tools M08012 9 99 ...
Страница 560: ...NOTES M9 28 Air Conditioning System M09010 6 97 for HFC 134a Refrigerant ...
Страница 575: ...ALTERNATOR PARTS Refer to previous page for Parts List M13003 04 01 Niehoff Alternator Overhaul Manual M13 5 ...
Страница 618: ...M20 20 Payload Meter II M20007 10 00 ...
Страница 619: ...M20007 10 00 Payload Meter II M20 21 ...
Страница 627: ...M20007 10 00 Payload Meter II M20 29 ...
Страница 634: ...NOTES N1 2 Index N01020 03 01 ...
Страница 654: ...NOTES N3 6 Cab Components N03011 7 98 ...
Страница 660: ...NOTES N4 6 Operator Comfort N04020 ...
Страница 686: ...NOTES N5 26 Operator Cab Controls N05044 ...
Страница 688: ...NOTES P1 2 Index P01024 ...
Страница 691: ...P02034 Lubrication and Service P2 3 ...
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Страница 737: ...NOTES R1 2 930E Schematics R01048 with Cummins QSK60 Series Engine ...
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