eBay TB6560 Stepper Motor Driver Boards

[RobMar]

Hi everybody, I'm just another new (and perplexed) user of the TB6560 board. (I'm from Italy, so forgive me for my bad english)
Due to lack and inaccuracy of the documentation available for the board, I've searched around and come by chance to this forum, where I've luckily found answers to some of my doubts and saved some chip-smoking (up to now...) thanks to many intrepid experts that shared their experiences. Kudos to you all.
Now, I've started to test the basic functions of the board (a blue 3-axis HYU68 from Ebay) with 3 NEMA-23 2A motors, 24V supply, just testing the basic signals on the 15-pin port (no parallel connection at this time)
The first problem I've encountered is that the pinout table shown on the manual seems to be wrong, with pins 9 to 15 reversed left to right, like if someone has correctly counted pins 1 to 8 of top row and then continued to count the numbers of second row backwards instead of going back to "new paragraph" as is customary on Cannon-type connectors. I say this because I've found the expected 5V and GND on pin 9 and 10 respectively, instead of 15 and 14 as stated in the manual. (the order of the top row 1-8 appears to be correct)
Did someone else notice this? (and also eventual other mismatches on the 25-pin parallel port?)
Thank you for any suggestion
Roberto

[CAD_Rickosz]

Yes and do not not even once go over 24V with nema23 steppers or
you can put out the frying tonight sign just like my bit of electronics did.

[williamturner1]

do not not even once go over 24V with nema23 steppers or
you can put out the frying tonight sign just like my bit of electronics did.

Hi. Great thread! v interesting to read. Thank you guys for sharing.


My Question: Is it possible to establish the cause of the exploding chip? and how to prevent any future damage?

........1. Back EMF caused it?
..................could it be the board has insufficient protection
..................maybe additional protection should be added - as described by irving2008 in this thread

........2. Something fries when a PSU of >24v is used?

or some other reason?

Surely too higher voltage from the PSU would have damaged the chip there and then?
Does the delay in chip exploding (ie when next turned on) hint at back emf damaging it during motor rundown or at the end of last run and that damage only apparent when you next turned the device on and it exploded?

PS. Anyone in the M25 with a CNC set up that I can come around and admire / ask a few questions about their implementation of driver board vs software and motors? Im a newbie starting out. I'll happily pay you for your time in beer!