Crane operation
11.5 Crane operation with main boom
11 - 82 3 302 736 en Operating manual
GMK4090
xx.xx.xxxx
Lifting limit switch override
When overriding, the shutdown of the lifting limit switch is cancelled and
the crane operation is no longer completely monitored.
• Press the button (2)
– The lamp (1) flashes.
– A buzzer tone sounds.
If the lifting limit switch is triggered now, the
crane movement is stopped once.
The stopped crane movement is enabled
again if you bring the control lever to zero
position and then move it again.
This crane movement will now not be stopped
again.
Cancelling the override
• Release the button (2) or leave the shutdown
range.
– The lamp (1) goes out.
– The buzzer tone is switched off.
G
Risk of accidents if the lifting limit switch is overridden
You may override the lifting limit switch only if this is specified in the oper-
ating instructions for 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 accidents 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 accidents due to the overridden rotary shaft gear shift
If the lifting limit switch has been overridden, then the load torque related
shutdowns of the slewing gear will not be released (for example, if the pre-
tensioning pressure of the counterweights is too low). In this case, avoid
moving the control lever for slewing as long as the lifting limit switch is
overridden.
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