UT
Handbook for Use and Maitenance – 50000 WB-80-87-95
Edition
01/11
Revisione
00
30
50000WB_e111_E.doc
The load limiting device is made out of two pressure switches, one is located on the
main lifting cylinder and the other on the knuckle cylinder. When the pressure in one
of the cylinders overtakes the pressure at which its pressure switch is set, this will be
activated and will permit only these functions that are going to reduce the overload
condition. Two lights on the control box located on the control panel, inform the
operator if the boom in overload is the main boom or the knuckle boom. (pos. 2 and 3
Picture 20).
Machines equipped with an automatic stop device (moment limiting device) are
protected against overloads; the following points should always be born in mind
during operation:
a) The rating plate is the only instrument to establish the capacity of the
crane.
b) The device installed stops the machine when there is an overload.
However, the values shown in the load capacity chart must always be
observed.
c) Should the device intervene, the green light on the control panels next to
the controls goes off when the operator tries to move a function that is
controlled by the load limiting device.
d) To reset the load limiting device, retract the extension cylinder for a brief
moment.
All the other movements are free and must serve to
BRING THE LOAD TOWARDS
THE SLEWING AXIS,
bringing the crane back to the safety position.
FOR CRANES EQUIPPED WITH WIRE LESS RADIO REMOTE CONTROL
All functions are automatically slowed down when the load-limiting device is activated.
After the load limiting device is being reset, move the switch from position "rabbit" to
position "snails" and after back to "rabbit" this operation will reactivate the standard
operational speed mode. (The switch is located on the sender box of the radio remote
control)
