Elevator motor/generator run protocol

Details Elevator motor/generator run protocol Elevator motor/generator run protocol

1981-02-13

1982-09-14

Truhe, J. V.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 118

Patent

active

043490875

ABSTRACT:
A plurality of elevators operating under the control of a group controller may provide a start request to the group controller in response to service demand when their MG sets have not been commanded to run, and in the absence of a responsive MG start command from the group controller, can start their own MG sets if there has been a communication failure with the group, instantaneously if commanded to start on emergency power or after a time interval if not commanded to start on emergency power, the time interval for each elevator differing from that of the other elevators so as to avoid simultaneous start-up. The group controller can shut off all MG sets when there has been no service demand in any of the elevators for some period of time, but each elevator can also shut off its own MG set when it has had no service demand for a period of time which is longer than the period of time for which the group shutdown must wait. And, if the car is on service independent of the group, it can shut off its own MG set in less time than it would if it is on group service.

REFERENCES:
patent: 2968364 (1961-01-01), Robertson
patent: 3506095 (1970-04-01), Weaver
patent: 3658156 (1972-04-01), Abbott

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