Well. my replacements for the rest of the chips in the 36v supply will arrive today. If that fixes it, fine , otherwise, it goes in the trash.
The annoying thin about the Keling is that they make this claim:
A: Stepper Motor Driver Power Supply Specifications:
1: High Efficiency, Low Temperature, Small Size.
2: Over Load and Short Circuit Protection.
3: Over Voltage Protection.
4: Input: 120VAC or 220VI was abusing it, no doubt about that, but I expected the worst to happen would be a trip or blown fuse.
If one was to buy the $60 Keling unit and immediately install a pair of transistors @ $32 and the other chips at about $9, you now have a $101 power supply and you are out the time to swap chips and have obviously voided any warranty. I think I would sooner shop around for the best price on a Mean Well or equiv.
I understand that unregulated means the voltage drops, but it seems incredible to me that a 20A power supply (that claims huge overload capacity) can start with 72V and drop so far with a max draw of 29A that it cannot keep a 4V stepper going.
The PS has dual rectifiers. Does that mean 10A per rectifier, or will either supply the total 20A? Can the rectifier limit current?
40A max draw on this NEMA34 servo seems like a formidable hit. Imagining 3 or 4 of these pulling juice at the same time is kinda scary
![Shocked :o](https://www.machsupport.com/forum/Smileys/default/shocked.gif)