[boyvox]

So I have a Superior Electric SS2000D6 drive (7amp, built in power supply, OPTO isolators) hooked up to my X and Y. I am using the machine one day and after I get done, I stop the program and am reading something for a minute while the machine is not doing anything but E-Stopped at program end and then I hear a POP like a firecracker and see a little puff of white smoke come out of the X drive. No power lights on. Dead.

So what happened? Voltage backfire from the Stepper? Short circuit in the drive somewhere? Is this a tell-tale scenario?

The 6A fuse is blown in the drive and when I put in another one it blows.

[2muchstuff]

Since the machine had been stopped/sitting still, I doubt if it was a back EMF problem. Have you checked the windings on the motor to see if one of them shorted out. Sounds like something shorted out in the drive.

[boyvox]

I don't think there were any shorts in the motor. My guess is that it was a short or something in the drive. I got them used for free...so what can you expect!! I'd still like to get an idea of what happened to it though.

[2muchstuff]

Open it up and look for something black and chared. Sometimes it is a black cased semiconductor and it may have a crack or pushed out section surrounded by some char or melted plastic.

[whateg01]

Though I am not familiar with the boards you have, tantalum caps are known for making a loud sharp crack when they explode. Regardless of what went boom, you can look for something blackened or cracked.

Dave