Good evening. I came across this thread with google and it is some help but I have a question. https://www.electro-tech-online.com/threads/diode-across-a-relay-1n4148-or-1n4001.20794/
The Omron timer-driven Omron relay always arcs across the contacts driving an Ogura automotive clutch and as it recently failed (had to sand the contacts) decided to instal IN4004 diodes as planned for ages ago. Initially placed the diode across the contacts, still got an arc, then realised had to place across the clutch coil, cathode to +ve coin lead, anode to circuit earth.
Arc has disappeared, but the clutch now takes maybe half a second to drop out, and the above conversation explains why. Shouldn't be a problem. However as its apparent that the back EMF is dissipating through the diode my question please is the IN4004 average forward 1A current and 50A peak rating sufficient for this setup? Clutch coil draws about 1.8A.
Thank you for your help. Also, am interest (if time permits) in building a 0 - 30V bench power supply can someone point me in the right direction please?
Paul
The Omron timer-driven Omron relay always arcs across the contacts driving an Ogura automotive clutch and as it recently failed (had to sand the contacts) decided to instal IN4004 diodes as planned for ages ago. Initially placed the diode across the contacts, still got an arc, then realised had to place across the clutch coil, cathode to +ve coin lead, anode to circuit earth.
Arc has disappeared, but the clutch now takes maybe half a second to drop out, and the above conversation explains why. Shouldn't be a problem. However as its apparent that the back EMF is dissipating through the diode my question please is the IN4004 average forward 1A current and 50A peak rating sufficient for this setup? Clutch coil draws about 1.8A.
Thank you for your help. Also, am interest (if time permits) in building a 0 - 30V bench power supply can someone point me in the right direction please?
Paul
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