Lift truck control providing time delay in operation of...

Details Lift truck control providing time delay in operation of... Lift truck control providing time delay in operation of...

B - Operations, Transporting

60

L

342/13.1, 342/34

B60L 11/18 (2006.01) H02H 7/08 (2006.01)

Patent

CA 1068384

LIFT TRUCK CONTROL PROVIDING TIME DELAY IN OPERATION OF DIRECTIONAL CONTACTOR ABSTRACT OF THE DISCLOSURE A chopper motor-controller for regulating a lift truck traction motor incorporates means for detecting faults which may cause the truck to run out of control, such as the high speed bypass contacts which shunt the semiconductor power switch being welded closed, and for disabling the controller in response thereto and also has time delay means for prevent- ing a directional contactor from closing in on a fault before the fault detecting means can operate to disable the con- troller. The disclosed controller may alternatively be connected to require the operator to relax the accelerator foot pedal when starting or changing direction or to permit change of direction while the foot pedal is depressed.

256474

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