Method for deactivating swing control with a timer

Details Method for deactivating swing control with a timer Method for deactivating swing control with a timer

1997-11-17

1998-10-13

Brahan, Thomas J.

Traversing hoists

Having means to prevent or dampen load oscillations

Antisway

212270, B66C 1900

Patent

active

058199632

ABSTRACT:
An apparatus and method of controlling a load oscillation dampener for a crane from which a load is suspended by a hoisting rope attached to a carriage which is driven by a motor controlled by a motion controller. A motion command having a duration is applied to the motion controller, the carriage is moved in response to the motion command, and it is determined whether the duration of the motion command is greater than a given time interval. If the duration of the motion command was less than the given time interval, the load oscillation dampener is deactivated to prevent uncontrolled motion of the carriage, and if the duration of the motion command was greater than the given time interval, the load oscillation dampener is allowed to cause motion of the carriage to damp load oscillation.

REFERENCES:
patent: 5490601 (1996-02-01), Heissat et al.
patent: 5526946 (1996-06-01), Overton
patent: 5713478 (1998-02-01), Habisohn

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