Lift truck control providing time delay in operation of directional contactor
US4081725A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1975 |
| Grant date | Mar 28, 1978 |
| Priority date | — |
| Expiry date | Dec 30, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/0844
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
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 preventing a directional contactor from closing in on a fault before the fault detecting means can operate to disable the controller. 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.