Depending on the crane design, an electrical slew switch-off is now installed which limits the slewing range of the crane electrically.

The electric slew switch-off switch consists of two or four limit switches, which are attached to the jib bracket using a bracket, as well as flexible plastic switching lugs, which are fixed to the switch rail segment with a special tape fastener.

Depending on the control and switch-off (braking function and shut-down), a different number of limit switches must be installed at various positions.

If the switch rail segment has not yet been assembled, continue here. Otherwise, skip this section.

   Bolt the mounting plate to the gusset plate with M8x25 rib screws (3x). 35 Nm.

   Bolt the gusset plate to the web plate with M6x16 (6x) rib screws. 16 Nm.

   Bolt the switch rail segment to the wall mount using rib screws (4x) and rib nuts (4x).

   Bolt the plate to the clamping pieces (2x) with M8x25 rib screws (4x). 35 Nm.

   Bolt the alignment segment to the clamping piece using M10x20 rib screws (2x). 65 Nm.

   Bolt the square tube to the alignment segment using M8x40 rib screws (2x) and M8 rib nuts (2x). 35 Nm.

   Bolt the clamping piece with alignment segment and square tube to one side of the jib bracket using M10x40 rib screws (2x). 65 Nm. 

   Align the square tube horizontally.

   Initially only loosely bolt the second square tube to the horizontal square tube using a pipe clamp and M8 rib nuts offset by 90°.

The limit switches still need to be aligned later. Therefore, the square tube should not yet be bolted tight with tightening torque.

   Bolt the vertical square tube loosely to the previously mounted horizontal square tube from the inside using a pipe clamp and M8 rib nuts.

The limit switches still need to be aligned later. Therefore, the square tube should not yet be bolted tight with tightening torque.

   Bolt the angle (2x) to the connection plate (2x) using M8x10 fillister-head screws (4x). 35 Nm.

   Bolt the angle (2x) to the vertical square tube using threaded brackets (4x) and M8 rib nuts (8x). 35 Nm.

The limit switches must be installed on the same side!

   Slew the jib arm until the jib bracket is centred in relation to the switch rail segment.

   Align the vertical and horizontal square tube so that the limit switches point towards the centre of the jib bracket and touch the switch rail segment.

The rollers of the limit switch must run along the switch rail segment.

   Tighten the pipe clamps. 15 Nm.

   Slew the jib arm so that it is in the required switching point for the braking function or shut-down.

   Mark the switching point and swivel the jib arm to the side.

   Glue the tape fastener to the switch rail segment.

The limit switch must run along the centre of the control cam.

The tape fastener for the shut-down (top) should be adhered with an offset of a few centimetres in the slewing direction.

   Press the switching lugs onto the tape fastener so that the limit switch is activated at the respective switching point.

   Repeat the procedure for all switching points.

   Lay the connection cable from the limit switch to the control.

   Fasten the connection cables to the cable fasteners on the jib bracket with cable ties.

   Guide the connection cable into the control and connect it. See the wiring diagram.

   Check the electrical slew switch-off.

   If the square tubes protrude too far:

Shorten the square tubes.

   Press the ribbed end caps into the ends of the square tubes.