OBSTRUCTION MONITORING METHOD AND SYSTEM FOR A VERTICAL RECIPROCATING CONVEYOR
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United States of America Patent
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N/A
Issued Date -
Nov 8, 2012
app pub date -
May 4, 2012
filing date -
May 5, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method and system for controlling the operation of a drive motor for a vertical reciprocating conveyor. The method initially activates a drive motor to move a carriage from a resting position. After initial start-up period, the method sets a threshold current value as the present current value being drawn by the drive motor. The method compares subsequent present current value measurements to the threshold current value and determines whether the present current value exceeds or falls below the threshold current value by more than an operating limit. If the present current value falls within the operating limits, the threshold current value is updated to the present current value on a periodic basis. In this manner, the method continuously updates the threshold current value to compensate for an increase in the weight being lifted by the vertical reciprocating conveyor.
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