General Information
© Hirschmann Rev. E 11/12/08 190147_E
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1 GENERAL INFORMATION
The PAT Load Moment Indicator
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(LMI) has been designed to provide the crane operator with
the essential information required to operate the machine within its design parameters.
Using different sensing devices, the Load Moment Indicator monitors various crane functions
and provides the operator with a continuous reading of the crane’s capacity. The readings
continuously change as the crane moves through the motions needed to make the lift.
The LMI provides the operator with information regarding the length and angle of the boom,
working radius, rated load and the total calculated weight being lifted by the crane.
If non permitted conditions are approached, the Load Moment Indicator will warn the operator
by sounding an audible alarm, lighting a warning light and locking out those functions that may
aggravate the crane’s condition.
2 WARNINGS
The LMI is an operational aid that warns a crane operator of approaching overload conditions
and of overhoist conditions that could cause damage to equipment and personnel.
The device is not, and shall not, be a substitute for good operator judgment, experience and use
of accepted safe crane operating procedures.
The responsibility for the safe crane operation shall remain with the crane operator who shall
ensure that all warnings and instructions supplied are fully understood and observed.
Prior to operating the crane, the operator must carefully and thoroughly read and understand
the information in this manual to ensure that he knows the operation and limitations of indicator
and crane.
Proper functioning depends upon proper daily inspection and observance of the operating
instructions set forth in this manual. Refer to Section 6. Pre-Operation Inspection and
Calibration Verification of this handbook.
The LMI can only work correctly, if all adjustments have been properly set. For correct
adjustment, the operator has to answer thoroughly and correctly all questions asked
during the setup procedure in accordance with the real rigging state of the crane. To
prevent material damage and serious or even fatal accidents, the correct adjustment
of the LMI has to be ensured before starting the crane operation.
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LOAD MOMENT: generally the product of a force and its moment arm; specifically, the product of the load and the load-radius. Used in the
determination of the lifting capacity of a crane
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