(!) ATTENTION (!)
Activation of the exclusion device of the lifting moment limiting device.
When the operator uses this device, it means that he wishes to override
the lifting moment lifting device in order to make some manoeuvres
(which would be impossible with the device active) that bring the
moment to within the maximum level, but involve an overload condition.
In such an emergency condition (where the lifting moment limiting devi-
ce has been disabled), the operator, who is the main responsible for the
machine safety, must:
-
carefully consider the manoeuvres required to return to normal working
conditions: it is however compulsory to effect the re-entry of the exten-
sion booms at first,
-
calmly and carefully assess the type and scale of the hazards arising
from these manoeuvres and the possible reaction of the crane (tipping
over, frame overload, uncontrolled fall of the load due to a hydraulic
system overload etc.);
-
make all movements as slowly as possible to reduce the dynamic
overload to the minimum.
16.5
Lifting moment limiting device for two working
sectors
In case of one sector of the working area with reduced stability of the vehicle
(e.g. sector in front of vehicle cab) the limiting device can be provided with a
special function which allows to operate with a reduction of the intervention
level. The reduction of the intervention level reduces the crane capacity values
and this reduction value is defined in the vehicle stability calculation.
Consequently the working area is divided in one sector (e.g. body side) where
the crane works according to the capacity plate values and another sector
(e.g. cab side) where it works with reduced capacity values. The device has
consequently two intervention levels which are activated in relation to the sec-
tor of the crane working area always securing the vehicle stability.
(!) ATTENTION (!)
If the rotation stops by going through the working zone where the crane can
operate according to the capacity plate values to the one where it can operate
according to the reduced values, it means that one of the following conditions
is reached:
- rotation of a load bigger than the one admitted in the reduced sector defined
in the vehicle stability calculation;
- rotation without load applied but with (at least) one of the inner, outer rams
of the crane or the jib (if fitted) extended and pressurised at the stroke end.
The following manoeuvres are allowed:
- the opposite rotation
- the manoeuvres allowed by the limiting device in relation to the position of
the outer boom (positioned over or under the horizontal line).
16.6
Rotation limiting device
When a sector of the working area exists in which the stability is insufficient (for
example in the area in front of the cab) the permitted arc of rotation is limited by
means of an adjustable electro-hydraulic device which only allows operation within
the safe area. (Warning: persist in the operation!)
When exceeding the “safe area” the rotation limiting device only allowing:
- the opposite rotation
- the manoeuvres allowed by the limiting device in relation to the position of the
outer boom (positioned over or under the horizontal line).
16.5
CONTROLS TO
OPERATE THE CRANE
GRU FASSI
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