Procedure controlling the motor of a crane

Details Procedure controlling the motor of a crane Procedure controlling the motor of a crane

1991-12-17

1993-12-14

Shoop, Jr., William M.

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Plural, diverse motor controls

318 59, 318590, 212160, H02P 300

Patent

active

052706214

ABSTRACT:
The present invention relates to a procedure for selecting the mode of controlling the motor of a crane, or an equivalent lifting apparatus, when at least two alternative modes of controlling the motor are available, and at least one of the modes involves control by means of a switch having at least two positions connectable in a predetermined order, so as to produce corresponding control signals at a control input port. Each control mode uses at least one control signal common to all modes. According to the invention, the control signals applied to a control input port are monitored, the prevailing control situation is determined on the basis of the monitored signals and the mode of control is selected on the basis of which ones of the signals are active and the prevailing control situation.

REFERENCES:
patent: 3699578 (1972-10-01), Fiorentino
patent: 3732570 (1973-05-01), Fiorentino
patent: 4456132 (1984-06-01), LaValle et al.
patent: 4497028 (1985-01-01), Nozawa et al.
patent: 4912377 (1990-03-01), Bertrand
patent: 4956588 (1990-09-01), Ming
patent: 4958112 (1990-09-01), Zerillo

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