Page 5 - Marine_EN

APPLICATION STRADDLE CARRIER

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 electron-
ics installed in straddle carriers are often in use 24 hours a day, with any system failure
leading to delays and high costs.

FUNCTION
Several straddle carriers are controlled from one control
room. The dispatcher only indicates the desired end posi-
tion of the container to the vehicle, everything else is man-
aged 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 pro-
portional valves. For safety reasons, the entire hydraulics,
including control electronics and axes control, is kept redun-
dant, similar to aircraft construction. In addition to increased
security, the system also gains significantly 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 control-
ler. The steering unit transmits the values via a redundant
CAN bus system to the controller, which compares and reg-
ulates the positions with robust angle sensors. The propor-
tional amplifier electronics then controls the proportional

spool valves and regulates the steering angle of the axes.
All components are aligned with each other, allowing easy
commissioning and controlled operation.

SPECIALTIES
• Manual vehicle steering and various driving modes selectable
• Flexible safety functions can be extended at any time
• Intuitive parameterisation software for commissioning and maintenance
• Aligned hydraulics and electronics from a single source

WANDFLUH MARINE | APPLICATION | STRADDLE CARRIER | PAGE 3