ABUS electrics 3: Setting the switching point for the bottom hoist limiter

 

This section only applies to cranes with ABUS electrics 3. For cranes with ABUControl: see the ABUControl product manual.

The wire rope hoist has a gear limit switch with three switching points. The backup limiter and the top hoist limiter are set at the factory. The bottom hoist limiter must be set on site.

 

 

Lowering the load hook to the lowest hook position

*   Lower the load hook to the desired lowest hook position.

─     The load hook should not touch the floor of the building.

─     The wire rope should not be slack.

─     A certain minimum clearance must be maintained between the cable guide and the drum housing. This clearance is determined in the next work step.

─     The hook path (distance between the highest hook position [= hook headroom, dimension C] and the lowest hook position) must not be greater than is specified on the type plate.

 

 

Only with wire rope hoists with one cable guide

 

Cable guide

 

Cable drum

Drum housing

*   Measure the distance 'F' between the cable guide and the drum housing and compare this with the table.

Wire rope hoist

Type

Reeving

Distance ‘F’

GM 800

E, D, DA

4/1

42 ± 2

GM 1000

E, D,
DA

4/1

2/1

56 ± 2

GM 2000

E, D,
DA, DQA

4/1

2/1

59 ± 2.5

GM 3000

E, D,
DA, DQA

4/1

2/1

73 ± 2.5

GM 5000

E, D, DA, DQA

4/1

2/1

87.5 ± 3

GM 5000

D

4/2

73 ± 2.5

GM 5000

Z

4/2

8/2

87.5 ± 3

GM 6000

E, D, DA, DQA

4/1

2/1

102 ± 3

GM 6000

Z

4/2

8/2

102 ± 3

GM 7000

D, DA,
DQA

2/1

4/1

6/1

131 ± 4

GM 7000

D

4/2

8/2

87 ± 3

GM 7000

Z, ZA

4/2

6/2

8/2

10/2

131 ± 4

 

 

 

Only with wire rope hoists with two cable guides

 

Cable guide

 

Cable drum

Drum housing

*   Measure the distances 'F1' and ‘F2’ between the cable guides and the drum housing and compare these with the table.

Wire rope hoist

Distance ‘F1’

Distance ‘F2’

GM 5000 - D

80 ± 3

76 ± 3

GM 7000 - D

84 ± 3

87 ± 3

 

 

 

 

Warnung stürzende Last

Danger to persons from load drop!

The cable can be torn from the cable drum if the distances ‘F’ or ‘F1’ and ‘F2’ are not met. This could cause the load to fall, killing or injuring people.

The distance guarantees that there is always enough wire rope wound onto the cable drum.

Always maintain ‘F’ or ‘F1’ and ‘F2’.

 

*   If necessary, raise the load hook until the distance 'F' or ‘F1’ or ‘F2’ is achieved.

●   The lowest hook position of the load hook has now been determined. From this point, the braking distance will now be subtracted.

 

 

Travelling the braking distance

Lowest hook position
plus 500 mm

 

Floor of building

Lowest hook position

*   Raise the load hook until it is 500 mm above the lowest hook position.

 

 

Detaching seal

Seal

 

*   Take off the housing cover of the hoist limit switch enclosure on the cable drum.

*   Press the seal apart in the centre with a screwdriver and remove it.

 

 

Setting bottom hoist limiter

The bottom hoist limiter is set with the left adjusting screw.

 

White pointer of cam ring

Orange pointer

Left adjusting screw

Adjusting key

*   Remove the adjusting key. It is fastened on two mounts on the gear limit switch.

Alternatively, a hexagon wrench key size 3.0 (ideally with rotary plate) can be used.

An electrically operated screwdriver may NOT be used.

*   Press the adjusting key into the adjusting screw. Press it into the adjusting screw with light pressure.

*   If necessary: Turn the adjusting screw until the white pointer of the cam ring lies to the right of the orange pointer. It should be neither to the left of the orange pointer nor exactly on it.

The middle white arrow shows the exact position of the switching point; the two white arrows to the left and right of it indicate the start and end of the switching phase (switching hysteresis).

*   If necessary: Turn the adjusting screw until the white pointer of the cam ring lies to the right of the orange pointer. Continue turning until the white pointer lies exactly on the orange pointer and a clicking sound is audible.

─     Turning to the right shifts the switching point downward.

─     Turning to the left shifts the switching point upward.

 

 

Checking the setting

*   Raise the load hook.

*   Lower the load hook at both slow and fast lifting speed and check whether it halts at the lowest hook position.

 

 

Sealing the adjusting screws

Seal

 

*   Insert the seal on the adjusting screw and press it in.