Method and apparatus for measuring a load in a material handling system
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United States of America Patent
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Nov 10, 2015
Grant Date -
Nov 14, 2013
app pub date -
May 14, 2012
filing date -
May 14, 2012
priority date (Note) -
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Abstract
A system and method for determining the load present in a material handling system is disclosed. A commissioning routine executing on a motor drive controls operation of a hoisting motor with a known load present. The commissioning routine stores values of current provided to the motor or torque generated by the motor at various operating speeds in memory on the motor drive. During subsequent runs of the motor drive, the value of the current/torque is monitored as a function of the speed of the motor and compared to the stored values. The resulting value of the load may be monitored and action taken if the value of the load exceeds the rated capacity of the material handling system. Optionally, the measured load may be displayed to an operator.
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