JIB CRANES WITH AN ARTICULATED ARM MANUALLY ROTATED

DONATI SOLLEVAMENTI S.r.l. - Via Roma, 55 - 21020 Daverio (VA) - Tel. 0332 942611 - Fax. 0332 948597
4.4 - Putting the machine into operation
4.4.1 Preliminary operations - Adjustments and test runs
Before putting the jib crane into use, carry out the following
operations:
• Check the electrical system is in a suitable condition:
• Check that the voltage and line frequency, shown on the respective motor plates, correspond to
those designed for the functioning.
• Check that the voltage value to the motors is within the limits of +/-10% of the nominal value.
• Check there are ground clamps and that they are connected correctly.
• Checking the correct installation of the crane:
• Check there are no obvious faults following the installation of the crane.
• Check that all the bolted joints are correctly tightened.
• Check the uniform sensitivity of the flexing of the arm, in all its amplitude.
• Check that the arm can freely rotate, related to the absence of obstacles in the whole area of
operation of the crane and any interference.
• Adjust the ascent limit switches of the electric hoist (see information in the related “Instructions for
use”), to allow the maximum possible run. The ascent limit switch must be adjusted so that the
hook at its lowest point is about 10 cm from the ground.
• Check there are no leaks of lubricant.
• Check during the trial runs that there are no strange noises and/or vibrations and/or incorrect
movements (skidding of the wheels or, spontaneous movements of the trolley and/or the arm,etc).
• Checking the functioning of the correct rotation direction of the motors:
• If the crane is fitted with electric hoist:
• Operate, for brief distances, the “ascent/descent” buttons, taking care to operate first in one
direction (descent), and then in the other (ascent) with two brief impulses necessary only to
ascertain the correct direction of rotation, without using any electric limit switches.
• Avoid intervening using the lifting limit switch.
• If the rotation direction of the motors does not correspond to the
controls of the push-button control panel the limit switches do not halt
the movement, and malfunctioning can occur
• If the direction of the movement does not correspond to the function
shown on the push button control panel, halt the manoeuvre.
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