ELECTRICAL SYSTEM MLC300 SERVICE/MAINTENANCE MANUAL
3-2
Published 11-22-17, Control # 257-02
Crane Electrical Power Distribution
When the battery disconnect switch is closed and battery
power is available, turning the engine run switch S3 to the
RUN position provides power to terminal KL15 on the
following control modules:
When in the RUN position, the engine run switch also
provides power to the following components:
• Main (ODM) display
• RCL/RCI (RDM) display
• CraneStar TCU
When in the RUN position, the engine run switch provides
power from circuit breaker CB4 to relays K3 to K6, closing
the normally open contacts of the relays and providing power
to the engine control modules and the crane’s CAN Bus
control modules as follows:
• Relay K4 (Cummins engine): When energized, relay K4
provides power to the following:
- Engine ECM (via CB17)
- DEF hose heater relays (via CB19)
• Relay K4 (MTU engine): When energized, relay K4
provides power to the following engine control modules:
- MCM (via CB17)
- CPC4 (via CB16)
- ACM (via CB26)
• Relay K5: When energized, relay K5 provides power
from circuit breaker CB8 to terminal +UE on the
following control modules:
Relay K5 also provides power to terminals KL15 and
+UB of SCMD02.
• Relay K6: When energized, relay K6 provides power to
terminal +UB on all crane CAN Bus control modules
except SCMD02. Relay K6 also provides power to
terminals KL15 and +UE on the following control
modules:
- SCMD01—KL15
- IOSB22—KL15 and +UE
- CCMB11—KL15 and +UE
Relay K6 also provides power to the following
components and circuits:
- Jog dial and joysticks (via CB46)
- Climate controls (via CB42)
- Wiper controls (via CB43)
- Work lights and panel lights (via CB44)
- 24 V
DC
-to-12 V
DC
converter (powers the radio and
seat motor switches) (via CB41)
SCM-00 IOLC31
CCM-10 IOLC32
CCMC11 IOLC33
IOSA22 IOLC34
IOLC30
SCM-00 IOLC32
CCM-10 IOLC33
CCMC11 IOLC34
IOSA22 SCMD01
IOLC30 SCMD02
IOLC31
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