ABB IRB 6400 retrofitting

Thank you andypugh, i can't use the original drivers for the reasons i mentioned before.
The resolvers are read and sent to serial inside the robot. It's pretty complex, seem like that one board (called robot computer) controls all 6 the hbridges.
So I was planning a mesa setup with 8i20 + 7i49 as u mentioned, with some other mesa boards for serial and io expansion. But I didn't know about STMBL! It seems very cool! How it is the drive, has it a good dynamic? Thank you!

Ok i see, u r talking about the IRAM256-2067A2.
There are some of that modules from china but they're costly.

I repaired few inverter and drives and most of the time they use integrated igbt bridges (except some ABB stuff), because designing a proper igbt driver stage + discrete igbt bridge is not so easy. Maybe exists an pseudo equivalent to that IRAM.
I definitely have to take a deeper look to the project.

I can order few pcb's, order a paste mask, clean the rust from mine pick&place and reflow oven and flash some micro.

So you confirm me that drive works well, comparably to standard industrial drive? I saw the videos on Youtube and seemed good!

andypugh wrote: Some people have hand-built them, but most have regretted starting.

ahaha I know that feeling... Ok that's great and you noticed some performance difference between 8i20 and STMBL?

Doing a rapid search I find IKCM30F60GA to be a good candidate for IRAM replacement.

Just a brief update: I'm editing the stmbl schem-pcb-firmware to accomodate a much efficient and powerful on-semi integrated bridge (FNB34060T) and bigger caps.
So i had to modify the temperature reading, shunt resistors and other minor changes, but this bridge can delivery 4kW of power, with the same pcb form factor!
As soon I'll have the first prototype ready I'll post some news!

very nice.
I use the stmbl on a fairly large okuma lathe (ac servos).
They work very nicely once setup.
I don't use the lathe for production though so don't push them too hard.

Another quick update, I have the new pcbs, I plan to assemble this or next weekend.