And I say Electrickery because a lot of it which is gobbldygook to me.
The problem started of as wanting to remote start the 2nd ATX power supply in the 2nd case which would have no motherboard and I got an answer for that but someone else made a comment that I had not seen until the question was closed and I need to determine what if anything I need to do. Note I don't ever intend to have only one PSU connected but it would be nice to have the system protected for such an event.
There comment was as follows
"This would not be my first suggestion. It would be better with some isolation like two schottky diodes. While the PS_ON signals are inputs, their actual implementations can vary between PSU models and manufacturers. Connecting PS_ON wires together means there are two inputs loads for the motherboard to drive. But each PSU will pull its own PS_ON signal high to its own standby 5V supply. The voltages have tolerance, so current may flow from higher voltage supply to lower voltage supply via the PS_ON pins. When one PSU has mains unplugged, it might clamp PS_ON to GND, turning the other PSU on"
Would the comment be a problem? should I add schottky diodes? or would it be even better if it were opto coupled which would mean no physical connection?
Here is a diagram
- I am presently building a combination Network Attached Storage Raid 6 / Home brew 40Gb Switch using multiple Mellenox cards, a Broadcom 9361-8i and SAS Expanders on a Supermicro X10DRX motherboard which will hopefully fit in my Xigmatek Elysium case to run 16 of the SAS 3 drives and the other 12 in an iCute Super 18 case via an expander with all the proper SFF cabling between them.
The problem started of as wanting to remote start the 2nd ATX power supply in the 2nd case which would have no motherboard and I got an answer for that but someone else made a comment that I had not seen until the question was closed and I need to determine what if anything I need to do. Note I don't ever intend to have only one PSU connected but it would be nice to have the system protected for such an event.
There comment was as follows
"This would not be my first suggestion. It would be better with some isolation like two schottky diodes. While the PS_ON signals are inputs, their actual implementations can vary between PSU models and manufacturers. Connecting PS_ON wires together means there are two inputs loads for the motherboard to drive. But each PSU will pull its own PS_ON signal high to its own standby 5V supply. The voltages have tolerance, so current may flow from higher voltage supply to lower voltage supply via the PS_ON pins. When one PSU has mains unplugged, it might clamp PS_ON to GND, turning the other PSU on"
Would the comment be a problem? should I add schottky diodes? or would it be even better if it were opto coupled which would mean no physical connection?
Here is a diagram