During a fire, how does the fire alarm signal cut off the power to the air conditioning or activate the fans?
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In the event of a fire, how does the fire alarm signal cut off the power to the air conditioning system or activate the fans? The fire alarm signal is DC24V; how can it be integrated with AC220V? How is this achieved in practice?
It does not necessarily need to be connected directly to 220V; a fire alarm signal can be used to send a shutdown signal to the ESD, which in turn outputs a digital signal to turn off the fan
I think the simplest circuit can be achieved by adding a relay, I’m not sure if that’s correct. If it’s a refinery, then EDs have control over it as well; it’s interconnected.
I know it definitely won’t be a direct merger, so I’m asking how exactly this should be achieved. Are there any schematics or similar things that can provide clarification?
Reply to LZ: You can find a diagram of the MCC (Motor Control Center) and take a look; it usually contains information on how to connect the interlock signals