Appendix: Important notes for crane operators and crane operating companies
© 2009 Hirschmann Automation and Control GmbH · Branch Office Ettlingen · eMail: info.ecs@hirschmann.de · www.hirschmann.com 45
24 183 19 1012e (Generic) / 2009-02-26 / Rev. 01 / rk.
NOTICE 1 Cut-out values for boom cranes with load-bearing capacity which
varies depending on the differing load
The crane cut-out values are determined by us on the basis of the load tables and design drawings specified by
the crane manufacturers.
These theoretical cut-out values must be checked by tests on the crane with balanced test loads in all operating
modes and at least with the following equipment depending on the crane design.
• Cranes with fixed boom length during operation:
Smallest, middle and largest radius at shortest, middle and longest boom length, and at these boom lengths
at the shortest, middle and longest tip booms.
• Cranes with boom length which can change during operation:
Smallest, middle and largest radius at every length stage and all tip booms.
NOTICE 2 Important information for the crane driver
The LMI is an operating aid which warns the crane driver of an imminent overload to prevent personal injury or
damage to property.
This system cannot and is not intended to be used as a substitute for the crane driver’s good judgement or
experience or the application of acknowledged safe working practices when using cranes. It does not release
the crane driver from his responsibility for safe operation of the crane. He must ensure that he understands and
complies fully with the information and instructions displayed. Before he starts work with the crane, the crane
driver must have thoroughly read and understood the entire manual to ensure that he knows the operation and
the limits of the LMI and the crane. Perfect functioning depends on the correct daily checking of the system and
compliance with the operating information provided in this manual.
The system can only help the crane driver if the LMI is correctly set and the right load table and correct
operating mode number is entered for the particular equipment. To prevent damage to property and serious or
even fatal injury to people, the correct setting of the LMI must be guaranteed before crane work begins.
This system can be fitted with a manually operated external device (key switch / button)
which bypasses the cut-out function of the LMI or lift limit switch system. The switch or
button may only be actuated in emergencies and by authorised personnel. Non-compliance
with these instructions can result in damage to property and serious or even fatal injuries to
people.
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