Attaching the electrical slew switch-off

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

The electrical slew switch-off is comprised of one or two limit switches that are fastened to the jib bracket, and flexible plastic switching lugs that are positioned on the pillar using a special tape fastener.

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

Only with a control in the panel or ABULiner frequency converter

For braking function:

Mounting plate (with two limit switches), mounted on left or right on the jib bracket.

Switch-off	Slewing direction	Position of limit switch
Braking function	left	top
Braking function	right	bottom

For braking function or shut-down:

First mounting plate (with two limit switches), mounted on one side of the jib bracket.

Switch-off	Slewing direction	Position of limit switch
Shut-down	left	top
Braking function	left	bottom

Second mounting plate (with two limit switches), mounted on the other side of the jib bracket.

Switch-off	Slewing direction	Position of limit switch
Shut-down	right	top
Braking function	right	bottom

Only with electronic control in the electrical system housing

For braking function:

Mounting plate (with a limit switch), mounted on left or right on the jib bracket.

Switch-off	Slewing direction	Position of limit switch
Braking function	left and right	top

For braking function or shut-down:

First mounting plate (with a limit switch), mounted on one side of the jib bracket.

Switch-off	Slewing direction	Position of limit switch
Braking function	left and right	bottom
Shut-down	left	top

Second mounting plate (with a limit switch), mounted on the other side of the jib bracket.

Switch-off	Slewing direction	Position of limit switch
Shut-down	right	top

Only with a slew switch-off on a jib crane with cylindrical pillar cap (size 273 to 558)

Drilling the holes in the jib bracket

a = distance between drilled holes and lower edge	b = distance between drilled holes

c = distance between first drilled hole and edge	d = width of jib bracket square bar

Drill threaded holes M6 (2x) in the jib bracket square bar.

Distance between drilled holes and lower edge of the jib bracket (a): 350 mm

Size	Dimension b [mm]	Dimension c [mm]	Dimension d [mm]
VS273	25	27.5	80
VS323	25	37.5	100
VS355	25	37.5	100
VS406	35	42.5	120
VS457	35	42.5	120
VS558	35	25	160

Installing the limit switch

Pillar	Jib bracket

Threaded plate	Rib screws M6x20

Screw the mounting plate loosely in place using rib screws M6x20.

Only with a slew switch-off on a jib crane with conical pillar cap (size 660 and 762)

Installing the limit switch

Vertical beam on the jib bracket

Pillar	Threaded plate

Screw the mounting plate on the side of the beam on the jib bracket using the clamping piece. 25 Nm.

The figures show the attachment of the tape fastener and switching lugs on a jib crane with a cylindrical pillar cap. The attachment to a jib crane with conical pillar cap is, essentially, no different.

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

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.

Move the bolted flange so that the limit switch is reliably activated by the switching lugs.

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

Actuating cam	Limit switch for shut-down

Tape fastener	Limit switch for braking function