Hi,
I have 3 ATX Power supplies on hand and I want to run them in series to get 36V for a diy CNC Plasma Table I am building.
I read through the entire thread on daisy chaining them, and read other sites and articles, but I am unclear on four points.
I understand that all power supplies after the first in the series must have the (-) ground disconnected from the case. I have done this and checked it with a multimeter to ensure there is NO continuity between a black wire and the case. DONE.
I have also read that I need a resistor between any one black wire (ground) and any one red wire (+5V). This is not demonstrated in the image below that I found on the daisy chaining thread....
Q1: Is the load resistor on the 5V only needed during testing when no driver is connected? Can it be omitted once the power supply 36V is connected to the drivers. Do the drivers provide the load during operation that the load resistor provides during testing?
Q2: If the resistor cannot be eliminated, do I need 3 resistors, one per power supply?
On my main power supply, I joined one black wire and one green wire. As I understand it, this allows it to turn on.
Q3: Do I need to do the same on the the other two power supplies also?
Q4: Do the three Powwer Supply Metal Cases need to be electrically insulated from each other or can they be connected?
Thank you for your help.
-Mike