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Alarm Indication PC Board
I am struggling to Understand how this Alarm indicator PCB works

Dear Control Engineers,

I have this pcb which has LEDs to indicate the Alarm condition. the sensors are switches installed on the Engine. i have some understanding but there are certain things which still confuse me. please help me in understanding how this card works.

1 out of 1 members thought this post was helpful...

It's very hard to read the text, and I can't get it to print out. But I believe the first link is not just an alarm, it's also some interlocking. My guess is it's a generator or something with an engine. I think all the diodes grouped together are collecting the various alarms for an audible device or perhaps a trip relay.

The Alarm lights are the ones in the middle with a resistor above.

Any chance of getting a more legible link?