Appendix: Important notes for crane operators and crane operating companies
© 2008 HIRSCHMANN Automation and Control GmbH · Branch Office Ettlingen · eMail: info.ecs@hirschmann.de · www.hirschmann-usa.com 54
50 650 19 0201e_Rev C (LinkBelt278).doc / 2008-08-18 / Rev. C / rk
INSTRUCTIONS 1 Shut-off values for boom cranes with variable load ratings
depending on variable working radius
The crane shut-off values are determined by us based on the load charts and design drawings specified by the
crane manufacturer.
These theoretical shut-off values must be checked by means of tests on the crane with weighed test loads for
all modes and at least with the following rig arrangements, depending on the crane design.
• Cranes with fixed boom length in operation:
Smallest, medium and largest radius for shortest, medium and longest boom length, as well as shortest,
medium and longest jibs for these boom lengths.
INSTRUCTIONS 2 Important notes for the crane operator
The LMI is an operating aid to warn the crane operator of an imminent overload or of the hook block
approaching the boom head, in order to avoid possible damage to property or personal injury.
This system cannot be, and is not intended to be, a substitute for good judgement or experience on the part of
the crane operator, or for the application of recognized, safe working methods when using cranes. The crane
operator is not released from his obligation to operate the crane safely. He must ensure that he fully
understands and follows the notes and instructions displayed. Before beginning work with the crane, the crane
operator must carefully read and understand the entire Manual to ensure that he is aware of the operation of the
LMI and the crane. Proper functioning depends on due daily inspection of the system and compliance with the
operating instructions listed in this Manual.
The system can only offer the crane operator help if the LMI is correctly adjusted, and the correct load chart and
the correct operating code have been entered for the particular rig arrangement. To avoid damage to property
and serious or even fatal injuries to persons, it is essential to ensure that the LMI is correctly adjusted before
beginning crane work.
This system can be equipped with a key-operated switch which is located in the
microprocessor central unit. This key-operated switch overrides the LMI's shut-off feature.
The switch may only be actuated in emergencies by authorized personnel. Non-compliance
with these instructions may lead to damage to property and serious or even fatal injuries to
persons.
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