My idea/goal is to be able to switch a main control and drive enclosure to three different machines with different power requirements. Yes I know, only one machine can be used at a time. Because of the different motors for each CNC device, I designed this to use a dial face on the Pot that goes from 0 to 3.5, with the rest of the range in Red. As has been stated, anything above 3.5k, acts as no resister so that bit of range got red. I checked the Pots and they are fairly precise and linear. Is this a bad idea? Could you explain why it's bad if it is?
I also figured out why I blew the mosfets on the one drive. I put a fuse in the power supply's drive(s) side, then checked the fuse with the power on. I'll direct wire from supply to the drives before powering up next time. John came by and put the wires back on at my direction. Monday we'll quality control and change the fuse for direct connection. (I'm a working quad now.)
I'm sure I know the answer to this, but I'll ask again to be sure. A old six wire 2.5v, 4.6A motor can be used to test the drives. The motor will only have a tape flag on the shaft. There will be reduced power due to the reduced amps which shouldn't matter. The motor will be wired half winding. The power supply is a switched 24v 10A switched supply adjusted to 27v. Is this okay?
Thanks, pictures soon.