I have 3 5056 drivers being powered by a 40v 10amp power supply. I am running 3 400oz in 4.09amp current setting. They are running with sw4 in the in "on" position and in 1/8th step micro stepping.

They were running great and my PC died that was running the machine. I set up a new PC and ran my first part with it and noticed a "hot electronics" smell. I opened the case they are in and the heat was coming from the drivers. They never ran hot like this before and the only difference is they are plugged into a new PC.

Anyone have any ideas?