20.8
Crane with lifting moment limiting device and
"Prolink" (if fitted)
The cranes fitted with “Prolink” can operate the outer boom and/or the hydraulic
jib with an increased angle towards the top. The value of the inclination angle of
the outer boom and jib is indicate on the capacity plates.
In order to prevent the booms from exceeding the maximum angle over the hori-
zontal line, the crane is fitted with a suitable safety device.
If during the utilization, the verticalising limit value of the hydraulic jib
has been rea-
ched, the safety device intervenes
preventing every further
verticalising
.
Manoeuvres not allowed with the intervention of the safety device
- Lift of the inner boom
- Lift of the outer boom
- Lift of the jib mouvement boom
Manoeuvres allowed
- All other movements
Safety device for “Prolink”.
The device is continously monitored, therefore an eventual fault causes an
alarm signal on the control panels and stop the three prevented movements
(see above) leaving all other movements free.
At this point it is necessary to read the alarm message and the paragraph which
concerns the alarms in the use and maintenance manual and follow the written
instructions
(please see paragraph 16.4.3 for the working of the safety system).
The safety device receives the signals about the inclination of the outer boom of the
crane and of the hydraulic jib and transmits them to
the limiting system that controls the manoeuvres.
The significant values are the first and the second
angle limit (alfa1 and alfa2 respectively about 70
and 80 degrees from the horizontal line).
Function of the safety device controlling the
articulation “Prolink”
When the first angle limit alfa1 is reached, the
safety device temporarily stops all movements and
activates the flashing red light; “Warning angle”
is displayed on the screen. In order to reactivate
all the crane functions (except
for the lifting of the inner boom
that in this case is definitely
disabled) just put the all the levers
in neutral position. Press the LMI
button to remove the message
“Warning angle” (it will disappear
when the temporary block angle
alfa1 is no longer exceeded).
When the second angle limit
alfa2 is reached, the safety
device definitively stops all lifting
movements and activates the fixed red light; “Max angle crane” or “Max Angle
jib” are displayed according to which boom has reached the limit.
20.8
USE OF IMPLEMENTS
GR3_4_5
EVOLUTION
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