Crane operation
11.3 Crane operation with main boom
Operating manual GMK 6400 3 112 993 en 11 - 63
12.07.2013
Overriding the lifting limit switch
When overriding, the shutdown of the lifting limit switch is cancelled and
the crane operation is no longer completely monitored;
à Overriding RCL
or lifting limit switch for rigging work
, p. 11 - 45
Lowering limit
switch
The lowering limit switch (1) prevents the hoist rope from being reeled off
the drum completely.
The lowering limit switch works only if the switch-off point is set correctly
(e.g. after changing a hoist rope);
à Maintenance manual.
G
Risk of accident if the lifting limit switch is overridden
You may only override the lifting limit switch if this is specified in the oper-
ating instructions when carrying out maintenance or rigging work.
With the lifting limit switch overridden, you may drive only at the minimum
speed and without a load.
G
Risk of accident due to gaps in monitoring
If the lifting limit switch is overridden, crane operation is no longer com-
pletely monitored.
When hoisting the lifting limit switch weight, the crane movement will be
stopped once. After moving the control lever again, the crane movement
will again be enabled and will not be switched off again.
G
Risk of accident due to incorrect setting or intended triggering
Prior to operating the crane, ensure that the lowering limit switch is set cor-
rectly and always complete the lowering operation before the lowering
limit switch is triggered.
This prevents the hoist rope from becoming damaged due to complete
unreeling or switching off at high speeds, and the load being dropped as a
result.
G
Risk of accident due to adjustments made to the lowering limit switch
Always re-adjust the lowering limit switch if you unreel hoist rope from the
stationary rope drum. The lowering limit switch does not record the
number of these winds.
This prevents the lowering limit switch from switching off too late or not
switching off at all, the hoist rope from being damaged and the from load
being dropped.
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