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 TM 55-1925-273-10-1
0086 00
LOAD MOMENT INDICATOR (LMI) OPERATION
1.
Perform the Load Moment Indicator (LMI) Startup procedure in this work package.
2.
During normal operation, the LMI has five display screens, defaulting to the primary operating display shown in figure
10. You may move from screen to screen with a simple push of either the up arrow button (figure 2, item 5) or the down
arrow button (figure 2, item 4). After approximately ten seconds the Liquid Crystal Display (LCD) (figure 2, item 1)
will always default to the primary operating display. This function cannot be changed.
3.
The primary operating display provides the operator with the information outlined in table 1 and figure 10.
Table 1. Primary Operating Display Screen Data (refer to figure 10)
Item No.
Display
Information Displayed
1
Angle
Actual boom angle in degrees in 0.5 increments.
2
Radius
Actual radius in feet in 0.1 feet increments as measured from the crane center of
rotation to the center of the load.
3
MAIN Load
Displays the actual load on the hook in 100 lb increments
4
Bar Graph
Displays a bar graph of the percentage of permissible load, increasing from left to
right as the load increases. Blank display indicates no load. All bars filled at 100%
of load.
5
Percentage
Displays a numerical value of the percentage of allowed load.
6
MaxLoad
Displays the actual maximum load allowed as determined by the load chart.
4.
During operation, the values on the primary operating display will change in response to the changing operating condi-
tions of the crane.
WARNING
Never operate the crane in an overloaded state. Operating the crane in an overloaded
state can lead to structural failure of the crane. Failure to comply will result in death or
serious injury.
5.
The LMI will alert the operator to overload conditions via audible and visual alarms. The audible alarm is in the form
of a beeper signal; the visual alarm is in the form of a flashing display panel accompanied by various text messages.
a.
If the crane reaches 90% of its rated capacity for a given condition, the 90% alarm will activate. In this mode, the
following indications are given:
1)
The 90% overload screen (figure 11) will appear and the alarm beeper will beep slowly.
2)
After approximately 10 seconds, the 90% overload screen (figure 11) will be replaced by the primary operat-
ing display screen (figure 10). At this time, the primary operating display screen's bar graph display (figure
10, item 4) will flash and the alarm beeper will continue to beep slowly.
3)
The bar graph display (figure 10, item 4) will continue to flash and the alarm beeper will continue to beep
slowly until the load moment is reduced or until a 100% overload condition is achieved.
0086 00-4
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