Manitowoc MLC300 Service And Maintenance Manual

Reference Only
Manitowoc Published 11-22-17, Control # 257-02 3-1
MLC300 SERVICE/MAINTENANCE MANUAL ELECTRICAL SYSTEM
3
SECTION 3
ELECTRICAL SYSTEM
ELECTRICAL DRAWINGS AND
SCHEMATICS
Electrical schematics are located at the end of this section.
ELECTRICAL POWER SEQUENCE
Battery Power
Power for the crane’s electrical system is provided by two
12-volt batteries connected in series to produce 24 volts.
The following devices are connected to the battery positive
terminal at all times:
• Alternator (via 150 A alternator fuse or circuit breaker)
- Alternator fuse (F0)—Cummins engine
- Alternator circuit breaker (CB0)—MTU engine
• Intake air heater (Cummins engine)
• Remote battery positive terminal
• Starter solenoid
• Battery disconnect switch
• CraneStar® TCU (via fuse F5)
Battery Power Disconnect
When in the OFF position (contacts open), the battery
disconnect switch S1 disconnects the battery positive
terminal from the crane’s electrical systems.
The battery disconnect switch is turned to the OFF position
for the following situations:
• Whenever the electrical system is being serviced
• During extended downtime to help save battery life
• For security reasons
The battery disconnect switch must be in the ON (contacts
closed) position for machine operation. When the switch is
closed, battery power becomes available to the following
circuits and devices, via the main circuit breaker CB61:
• Engine run switch S3 (via CB6)
• Display modules (via CB4)
• Relay K3 and external run switch S33 (via CB4)
• Relays K4 and K6 (normally open contacts)
• Relay K5 (via CB8)
• Horn, dome light, and service lights switches (via CB5)
• Radio clock and preset memory (via CB5)
• Boom top warning light switch (via CB6)
• Setup remote battery charger (via CB4)
• Diesel heater (via CB9)
• Relay K7 (normally open contacts) (via CB2)
CAUTION
Avoid Electronic Control Module Malfunction!
Before turning the battery disconnect switch to the OFF
position, make sure the engine run switch has been off for
at least five minutes. This will avoid engine fault codes
and undesirable operation.

Manitowoc MLC300 Specifications

General

Brand	Manitowoc
Model	MLC300
Category	Construction Equipment
Language	English