Problem with the alarm interlock circuit
Thread Content
Discussion: 1. The figure below shows the difference in the interlock circuits for instant accident alarms. If an accident occurs at the first accident point X1 instantaneously, the red light 1 will turn on and the horn D will sound ； When the confirm button is pressed, red light 1 goes out and the horn D does not sound – what causes this?
Data on signal alarm and interlocking systems, for reference.
This post was last edited by jlshnlhj on 2024-1-9 at 09:46. X1 should be a pulse-triggered signal, meaning it turns off automatically after turning on, and the signal is not maintained continuously. The question to ask should be: “When the confirm button is pressed, why does the red light 1 go out and the horn D not sound?” ” When the confirm button is pressed, the R2 coil loses power, the R2-1 contact opens, the R1 coil loses power, and the red light 1 goes out. When the R1-3 (and) R2-3 contacts are disconnected, the horn D does not sound.
Safety Instrumented Control System (SIS).
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