Position control system for elevator

Details Position control system for elevator Position control system for elevator

1985-10-09

1987-06-16

Shoop, Jr., William M.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 302

Patent

active

046730621

ABSTRACT:
A position control system for elevators including a plurality of pulse encoders which independently generate pulse signals in accordance with the movement of a cage. The pulse signals are respectively counted, and the operation of the cage is terminated when a difference in counted results between the encoders has exceeded a predetermined value. Thus, the cage can continue to operate even if there is a small difference between the counted results, and, when any of the pulse encoders malfunction, which triggers a substantially larger difference in counted results, the cage is controlled to stop the operation.

REFERENCES:
patent: 4387436 (1983-06-01), Katayama et al.

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