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1. GENERAL INFORMATION
The load moment indicator HC3901 (hereinafter referred to as LMI) is applicable to the telescopic
boom crane, lattice boom crane, all- terrain crane and other types of cranes.
The HC3901 LMI can provide the crane operator with essential information required to operate the
crane within its design parameters. Using different sensors, LMI can provide the crane operator with
information on real time basis regarding boom length, boom angle, working height, working radius, rated
load and actual weight being lifted by the crane
The system operates on the principle of reference/real comparison. The boom angle is measured by
angle sensor that is mounted on the boom. The crane load is measured by force transducers attached to the
boom pendants. The real value, resulting from all the sensors measurement is compared with the
reference data, stored in the controller. If non-permitted conditions are approached, the LMI will warn the
operator by audible alarm, warning light and at the same time, some dangerous movements such as lifting
and luffing down will be stopped with the help of the crane control system.
This manual only gives guide for the LMI operation. Please refer to the Crane Operator’s Manual
provided by the crane manufacturer for detailed operating procedures of the crane.
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