LMI (Load Moment Indicator) System
Scale and Control Inc. offers the i4500 Crane Indicator / LMI (Load Moment Indicator) system, ideal for calculating the load weight value by reading the pressure of the crane's lift cylinders. This can be done through the use of pressure transducers on the cylinders to measure load weight, and a cable reel to measure boom length and boom radius. These values are then viewed on the i4500 display. This LMI system can also function as a Rated Capacity Indicator system.
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i4500 Crane Indicator / LMI System
Load Moment Indicator - LMI
For hydraulic cranes the Load Moment Indicator (LMI) reads its load value using a pair of pressure transducers, which read the cylinder pressures of the lift cylinders. An advantage of an LMI is the weight of the boom is calculated as a part of the load calculation. In doing so, the system will calculate the effects of elements such as wind and ice on available lifting capacity. The system has a digital version of the load chart programmed into it. The cable reel monitors the boom length, with an angle sensor typically integrated into the cable reel to calculate radius: Length x Angle = Radius.
The down side to an LMI is that the system is calibrated using the empty boom weight of all boom configuration and loaded boom weight for all boom configurations. This can be more costly when repairs or system replacement is required.
On lattice boom cranes, a moment system would see load cells placed in the pendent lines, again weighing the boom as a part of the load calibration. The down side to a lattice moment system is the high cost to calibrate the empty and loaded boom configurations as with the hydraulic system.
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