Triac-protected output circuit

Details Triac-protected output circuit Triac-protected output circuit

H - Electricity

02

H

324/58, 323/7

H02H 5/00 (2006.01) G05B 19/05 (2006.01) H02H 3/00 (2006.01) H02H 3/02 (2006.01) H02H 3/04 (2006.01)

Patent

CA 1154825

TRIAC-PROTECTED OUTPUT CIRCUIT Abstract of the Disclosure A secondary, protective triac is connected in series with a main load-control triac in an a-c output circuit for a programmable controller. The two triacs are coupled to a pair of digital inputs and when the main triac is conducting the secondary triac is not conducting -- unless the main triac stays "on" after an "off" signal is received, signify- ing a shorted main triac. If that occurs, a triac-failure fuse is blown and the secondary triac switches to conduct current and complete a virtually short circuit through a main power fuse. The blowing of the triac-failure fuse illuminates a neon bulb to give an indication of a main triac failure, and the blowing of the main power fuse illuminates a corresponding neon bulb to indicate a failure on the module and its disconnection from the load.

365706

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