Manitowoc Published 09-09-16, Control # 229-09 3-9
MLC650 SERVICE/MAINTENANCE MANUAL ELECTRICAL SYSTEM
CAN BUS CONTROL SYSTEM
CAN Bus System Overview
The CAN Bus control system consists of the following
components:
• CAN Bus
• Control modules
• CAN Bus devices
• CAN Bus terminator plugs
CAN Bus—The CAN Bus is the crane’s serial
communication network consisting of a shielded twisted pair
of wires—one wire is designated CAN High (+), and the other
wire is CAN Low (-). The twisted pair and shielding helps
prevent spurious signals and noise from being introduced
into the CAN Bus.
The crane contains six separate CAN Buses (Figure 3-5
):
• CAN Bus A (cab)
• CAN Bus B (carbody)
• CAN Bus C (rotating bed)
• CAN Bus D (RCL/boom)
• CAN Bus J (engine)
• CAN Bus H (CraneStar)
Control Modules—The CAN Bus control system contains
control modules that use the CAN Bus to communicate with
each other and with other CAN Bus devices. (For more
information, see Control Modules, on page 3-11
.)
The control modules receive inputs from components such
as switches, sensors, and transducers.
The control modules drive outputs to components such as
motors, relays, and solenoids. The control module
components are hardwired separately to the control
modules. (For more information, see Control Module
Devices, on page 3-17.)
CAN Bus Devices—Besides control modules, the CAN Bus
also contains the following devices:
*VPC = Variable Position Counterweight
CAN Bus Terminator Plugs—Terminator plugs reduce
electrical noise pickup. The terminator plugs are added to
each end of the CAN bus to match the impedance of the
CAN line, which prevents line reflection.
The terminator plugs may also provide a load for the control
module drivers.
• Main (ODM) display • Swing encoder
• RCL/RCI (RDM) display • *VPC™ encoder
• Jog dial • *VPC-MAX™ encoder
• Joysticks • Setup remote receiver
• Travel handles • CAN Bus program port
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