Crane operation
11.5 Crane operation with main boom
11 - 88 3 302 819 en Operating manual
GMK3060
13.12.2018
11.5.4 Lifting limit switch and lowering limit switch
Lifting limit switch To install/remove the lifting limit switch; Ã p. 12 - 95.
The lifting limit switch (1) prevents the hook block being lifted up to the main boom
head and damaging it.
The lifting limit switch only works if it has been unlocked;
à p. 12 - 100.
The lifting limit switch will be triggered if:
(A) – the hook block raises the lifting limit switch
weight or
(B) – the lifting limit switch weight touches the
ground upon lowering or
(C) – the lifting limit switch weight is not attached.
The lifting limit switch will not trigger if it is locked.
The lamp (1) will light up if the lifting limit switch has been triggered.
At the same time, all movements which would increase the load moment will
be switched off – Lifting, Lowering, Extending and Derricking the lattice extension if
necessary.
To cancel the shutdown, leave the shutdown range by performing a different
crane movement or by setting down the load.
G
Risk of accidents due to intentionally triggering the lifting limit switch!
Always complete the hoisting operation (and extending) before raising the lifting
limit switch weight. If the lifting limit switch weight is lifted at too great a speed,
the hook block may swing into the main boom head and damage the head
sheaves and the hoist rope.
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