I want to build simple ckt.
It has 1 contact which closes when any fault occurs to the system.
Then the bell is sounded.
The operator pushes accept button to silence the bell.
Then the contact can be reset afterwards
please reply to my mail
a_chahande@yahoo.com

 

The attached diagram should solve your problem.

Alberto

 

Thank u! Alberto
I want some more help. If the 'start contact' is not 'self reset' type and If there is 2 to 4 'start alarm' contacts.
Thanks!

 

a_chahande,

Is the fault(s) contact closure momentary, or does it remain closed as long as the fault exists? If it's momentary, Alberto's circuit will work. If its continuous, it will not work. The buzzer will be silenced only as long as the reset switch is held open. The buzzer relay will reactivate as soon as the reset switch is released. The attached circuit should work for silencing the alarm of one or more paralleled, continuous, fault-contact closures.

Ken

 

The circuit will work for simple application, as I understood from post #1, for more complex situation we need to use some electronics, and in this case request must be more specific with details on type sensors their number and sequence.

Alberto

 

system faults how ? detect what? Military provide a working order of what it must do when,how, where. You give us nothing except a system fault. whatever that means to you I am sure it means something else to others.