User`s manual

73
VERIFICATION OF THE EFFICIENCY OF BUFFERS
• Check that end stops are not deformed and that they are
firmly
secured to the structures and that the buffer is intact and well secured to its support.
• Replace buffers when they show: signs of breaking or of permanent deformation, cuts,
abrasions, incisions.
VERIFICATION OF THE EFFICIENCY OF THE CONTROL ELECTRIC SYSTEM
WARNING! Some of the operations described hereunder are performed with the power supply on, be extremely careful)
• Check the inside of the control equipment by opening the cases’ door(s).
• Operating on the push button panel, verify that the mobile parts of the contactors move properly and smoothly; otherwise, it
may happen that the electromagnet is not strong enough to guarantee the correct closing of contacts.
• To avoid false contacts, heating or noisiness, verify that the voltage fed to coils is correct.
• Verify the efficiency of conductors and grounding connections and, and tighten if necessary, all the screws of the grounding terminals.
• Verify that terminals are firmly tightened; check that the ID number is clearly visible and integral with the terminal; verify the thermo
insulating material is not damaged and promptly replace it in the event of cracks or rips.
• Keep an adequate stock for each fuse and/or temperature relays installed (see the wiring diagram), so that, if necessary,
they can be replaced quickly with one of the same kind.
• Check all the gaskets of covers and cable glands
• Check all ID plates on the cover or on the side of cases are at their proper place and readable
• Replace electric components immediately if they are no longer capable of guaranteeing functional reliability
Never perform improvised repairs.
VERIFICATION OF THE PUSH BUTTON CONTROL PANEL AND OF THE CABLE THEREOF
• Verify the conditions of the push button panel
• Check the functionality and efficiency of every push button,
• Clean push buttons removing all deposits and dirt from their seats
• Verify that nameplates are readable
• Check gaskets.
• Verify the conditions of the multi-core cable of the push-button panel as well as of all flexible cables, making sure there are no
cuts, abrasions, bare patches or bare conductors.
• Make sure the push-button panel's suspension strings are efficient and correctly attached to the body of the machine.
VERIFICATION OF THE EFFICIENCY OF THE LOAD LIMITER
The machine is equipped with a load limiting device.
The limiter consists of a wattmetric electronic system which, on perceiving an excessive power is required of the hoisting motor due to
overloading, acts on the supply circuit of the coils of control contactors of the electric appliance.
The intervention of the load limiter indicates the maximum admissible loading limit has been reached, stops all functions (hoisting and
traveling) with the exception of lowering.
• Verify its correct intervention by making sure that it's activated with a load ranging from 115% and 120% of the nominal load.
• Repeat the operation several times verifying the repetitiveness of the release values.
Load limiters are devices which perform safety functions and their breakdown or malfunctioning may seriously jeopardize the
safety of the persons exposed!
The verification of the setting value of the release limit of the intervention threshold of the load limiter must be performed, as
prescribed by the FEM 9.761 rule, at least once a year by using suitably prepared masses whose value is known and/or with the aid of
a loading cell with visualization of stress values.
Logging the values resulting from the yearly verifications of the setting of the load limiters into the check register is strongly
recommended.
Do not tamper with nor disconnect the load limiter, nor change the pre-established setting values