Technical data

- Descent of the hydraulic jib
- Re-entry of the extension booms section of the jib
- Winch rope descent
Crane with activated limiting device (overload condition) by the intervention
of the load limiter of the winch
Manoeuvres allowed:
- Rotation in both directions
- Re-entry of the crane extension boom sections
- Re-entry of the jib extension boom sections
- Winch rope descent
Manoeuvres not allowed:
- all other movements
Crane without load applied and activated limiting device
The limiting device may intervene also during loadless crane operation following a pres-
sure peak provoked by the attainment of the stroke end of the lifting ram at high speed. In
this condition, reactivation of the crane commands by performing one of the manoeuvres
is allowed by the system. If the limiting device intervenes when both the lifting rams are
open and at stroke end, and the crane extension booms are fully folded, it is not possible
to reactivate the commands, since the permitted manoeuvres (arm lifting and extension
fully retracted) cannot be carried out, because of the actual configuration of the crane
(outer boom above the horizontal). The device, in this case, allows the descent manoe-
uvres since it verifies the it was a peak pressure inside the lifting rams; the crane being
loadless, thus these manoeuvres will be allowed.
Temporised exclusion device of the lifting moment limiting device
The activation of the exclusion device is permitted when the limiting device is activated
and only in the case when it is impossible to carry out any of the allowed manoeuvres.
This generally occurs when handling heavy and bulky loads, with the outer boom
above the horizontal and the extension boom sections almost retracted.
(!) ATTENTION (!)
The activation of the exclusion system for the lifting moment limiting device
can ONLY be operated when the extension booms of the crane and of the
hydraulic jib (when fitted) are fully retracted.
The activation button of the excluding device, only in the case of the crane, are
to be activated as follows:
- retracted the crane extension booms until stroke end and momentarily pressurise;
- maintain the command for the extensions boom until the red led of the button LMI
placed on the control panel begins to flash;
- continue to keep the command for the extensions boom and press the exclusion
device button, the flashing red light becomes fixed;
- release the lever commanding the extensions booms.
The permitted manoeuvre is the descent of the outer boom in order to bring it under
the horizontal; remember that you have at your disposal five (5) seconds from the
command operation to carry out the descent. After such period of time, wait at least
one (1) minute in order to be allowed to carry out the manoeuvre once again.
The activation button of the excluding device, only in the case of the hydraulic jib,
are to be activated as follows:
- retracted the extensions booms of the hydraulic jib until stroke end and momentarily
pressurise;
- maintain the command for the extensions of the hydraulic jib boom until the red
led of the button LMI placed on the control panel begins to flash;
- release the lever commanding the extensions booms of the hydraulic jib;
- within 3 seconds from releasing the lever commanding the extensions booms of
the jib, retracted the extensions booms of the hydraulic jib until stroke end and
momentarily pressurise (the red led turns off as soon as the re-entry begins);
- maintain the command for the extensions boom until the red led of the button
LMI placed on the control panel begins to flash;
- continous to keep the command for the crane extensions boom press the
exclusion device button, the flashing red light becomes fixed;
- release the lever commanding the crane extensions booms.
The permitted manoeuvre is the descent of the outer boom in order to bring it under
the horizontal; remember that you have at your disposal five (5) seconds from the
command operation to carry out the descent. After such period of time, wait at least
one (1) minute in order to be allowed to carry out the manoeuvre once again.
16.4
CONTROLS TO
OPERATE THE CRANE
GRU FASSI