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STRADDLE CARRIER APPLICATION

In a globalised world where container ships with several thousand containers call at the
world's largest ports, the loading and unloading of ships is supported by fully automated
systems. The containers are stacked by self-propelled lifting cranes, so-called Straddle
Carriers, in an intermediate storage facility in the port area. The hydraulics and electronics
installed in the Straddle Carrier are often in use 24 hours a day and a system failure would
cause very high costs.

FUNCTION
Several Stradle Carriers are controlled from one control room.
The dispatcher simply indicates the desired end position to
the vehicle, everything else is managed independently by the
vehicle. Due to its high payload, a Straddle Carrier has six
to eight axes that are individually controlled, regulated and
monitored hydraulically via proportional valves. For safety
reasons, similar to aircraft construction, the entire hydraulics,
including the control electronics and the axes control, is
kept redundant. In addition to increased security, the system
thus gains in availability. System failures and the associated
time delays in 24-hour port operation are thus practically
eliminated.

CAN 3
CAN 4 power supply 24VDC
CAN 1
steering unit
8 x valves
A B
a b
P T solenoid outputs steering
controller digital vehicle
computer
8 x pressure p analog inputs in / outputs
s
CAN 2
RS232
8 x rotary encoder wheel angle
PASO

COMPONENTS
The heart of the system is the SIL2-capable steering controller.
Via a redundant CANbus system, the steering unit transmits
the values to the controller that compares and regulates the
positions with robust angle sensors. Through the proportional
amplifier electronics, the proportional spool valves and the
steering angle of the axes are then controlled. All components
are adjusted to each other, allowing easy commissioning and
controlled operation.

SPECIALITIES
• Manual vehicle steering and various driving modes integrated
• Various safety functions additionally expandable
• Parameterisation software for commissioning and maintenance
• Completely aligned system. Hydraulics and electronics from one provider

PAGE 4 | WANDFLUH MOBILE | APPLICATION | STRADDLE CARRIER