Using transformer with 3 28.5V secondary windings to supply 57VAC/80VDC

If you can measure the temperature of your transformer, put a load, and check the temperature. As Tommy said, that's the unique concern. So, until 60°C, you are fine. Insulation can go above, but I'm not sure what would be safe for the insulation. I think I drove motors until 80°C, maybe 100°C, without damage but it's not a good idea at all, you will heat the cabinet and can hurt someone if touching it.

The sticker may be gone... It although may be printed on the side.

No info on the side at all.

No info on the transformer anywhere.

Okay, just palnning stuff out.

I am a bit anxious/obsessive-compulsive sometimes.

Sorry.

It's cool!

No hard feelings!


BTW, I was a total moron and I blew the fuses in both stepper drivers and now I have to add a circuit breaker of something as a replacement.

Oh well...

Why would they use a quick-blow SMD fuse and ut it under the cap covered with silicone??!!

I'll use a 5A or maybe 7A circuit breaker because they take a while to trip for slight overloads.

They use SMD fuse because the stepper driver is usually a controlled current source, so impossible to have an overcurrent.

I'll "fix"(bypass) the fuse tonight and try the drivers tomorrow.

Now I exploded one of the current-limiting resistors in one of the drivers!

How fun!

I'll solder a board with like 20 1/4W resistors to make a 5W resistor 20x 1.5ohm

Now I blew up the same resistor in the other driver!

Why does this happen!