The light barriers of the obstacle detection sensor are installed in the front and back on the lower end carriage (two each per side). These serve in detecting obstacles in front of the end carriage and stopping the crane.

The connection cables for the signal lamp and light barriers of the obstacle detection sensor are pulled down through the A-frames from above by means of two draw wires. The connection cables for the light barriers and the signal lamp should be pulled simultaneously through the A-frame.

    Lay connection cables for light barriers (2x) and signal lamp (1x) from the main girder along the outer cross head beam to the A-frame.

    Secure the connection cables to the cable fasteners under the outer cross head beam using cable ties.

    One of the two draw wires leads to the bottom hole on the A-frame (hole directly on the lower end carriage). Fasten the two connection cables for the two light barriers here.

    The other of the two draw wires leads to the centre hole on the A-frame (the hole which is at eye level in the A-frame). Fasten the connection cable for the signal lamp here.

    Pull the two connection cables for the light barriers through the A-frame using the draw wire.

    Insert the cable bushing on the connection cable.

    Fix the cable bushing with cable clips.

    Insert the cable bushing in the hole in the A-frame.

    Position the two mounting brackets on the lower end carriage as shown in the picture.

The mounting brackets should be positioned apart at a slight angle to the end of the end carriage.

    Bolt on the mounting brackets using the M6x10 fillister-head screws with S6 washers (2 per bracket) in the outer screw holes. 5 Nm.

    Lay the connection cable in the light barrier and connect it.

    Close the inner cover of the light barrier.

    Attach the light barriers to the mounting brackets as shown in the picture.

    Bolt on the light barriers using the M5x35 fillister-head screws with S5 washers and M5 hexagonal nut. 5 Nm.

The light barriers ensure the shut-down of the crane if an obstacle is present within the traversing range. The light barriers must be aligned so that the crane, even if under load at maximum capacity, is able to come to a timely stop when the light barrier detects an obstacle.

    Determine the braking distance of the crane (under load at maximum capacity).

    Place an object that is as dark, flat and wide as possible (e.g. dark wooden beams) in front of the lower end carriage as an obstacle.

    The object should be laid so that it is at the braking distance in front of the lower end carriage.

    Then move the object an additional 0.5 m away from the end carriage (additional safety clearance).

    Set the range of the light barrier to “max” on the adjustment control.

    Tilt the light barrier fully back until it is nearly horizontal.

    Slowly tilt the light barrier forward until the LED lights up.

●   The LED on the light barrier lights up. The light barrier has detected the object.

    Slowly reduce the range of the light barrier (turn adjustment control toward “min”) until the LED goes dark.

●   The range of the light barrier is now reduced so far that the light barrier no longer detects the object.

    Slowly increase the range of the light barrier (turn toward “max”) until the LED lights up.

●   The range of the light barrier is now adjusted exactly for the object.

    Set all other light barriers in the same manner.

    Move the object back and forth and observe the LED of the light barrier.

When the object is moved away from the crane, the LED on the light barrier must go dark. When the object is moved back toward the crane, the LED must light back up.

    Attach the guard plate to the lower end carriage.

    Bolt on the guard plate with M6x12 rib screws (4x for each guard plate). 19 Nm.