Failsafe electrical circuitry

Details Failsafe electrical circuitry Failsafe electrical circuitry

1978-05-18

1980-12-09

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307296R, 307311, 340661, 361 90, 361187, H02H 106, H03K 5153

Patent

active

042386969

ABSTRACT:
A fail safe control circuit in which an input signal for initiating control of a potentially dangerous system is amplified only if it lies between given limits and also only if electrical power is being supplied to the system. The outputs of the amplifiers are monitored to check their correct operation, and two independent optical output signals obtained therefrom. The optical signals are arranged independently to operate switches in the system, such that both switches have to operate before the system can be actuated.

REFERENCES:
patent: 3550018 (1970-12-01), James et al.
patent: 3947669 (1976-03-01), Whitmer

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