TB6600 / HY-DIV268N-5A Problems, and possible solutions

[Doddy]

Phil,

If you could remove the cover and take/post a photo of the circuit board I'd be interested in comparing. Only advice is - when reassembling only tighten the case screws lightly (the plastic mould form for the screw hole tends to float inside the case - so if you tighten the screws too much it will snap the plastic.

[davies46]

Happily! Here it is:



the back showing the tiny chip:


and the block that sits on it (connected by some purple mat to the actual heatsink):


I expected it to be like the 6560 in size! It's labelled S109AFTG - I've been sold a totally different board



OK looking into datasheet, the TSD and ISD modes on this chip require more than just disable/enable to recover, so it's probably one of those, and since it's happening towards the end of a job it's maybe pointing more towards TSD error. Will reset heatsinking and try again.

OK, opened all the boxes, reduced clearance to heatsink and replaced foam pads with silicon grease. Heat sinks now getter hotter and no fail yet...

-Phil

[Doddy]

Phil,

Useful info there and it sounds like you're making headway into solving this - if so it would be invaluable to add your findings to this thread as you go, for the next poor soul who buys these (I also have 5 of these lying around... definitely not TB6600s, despite the eBay ad claiming them to be so - I think there's a hint as to the max voltage printed on the enclosure - I think (I'm at work at the moment) that the TB6600-based ones advertise themselves at upto 48V operating, whereas your's (and mine) at 40V are the little SMD devices. I'll also caution that the opto-isolators on that board are (according to datasheet) pretty sluggish devices - but chase one problem at a time and see if your thermal solution resolves your problems.

[davies46]

Well, I did the thermal treatment on Y and it didn't overheat and the heatsink got a lot hotter, which is great. I then did the same job on the other axes and put them all back (in different order, probably), this time the Z failed. Now I've heat-treated a spare and swapped that in, so trying again.

Ultimately I'd like to actually buy a real TB6600 controller and try that, anyone know of a good supplier for those? Not seen one in the UK yet that looks pucker, but Far East will do!

Thanks,
Phil

[Doddy]

Phil,

These are the ones that I bought...

https://www.ebay.co.uk/itm/Single-Ax...vbgiYCPuIMIsVA


Although my seller went under the name of "bigger*gift", but we all know the Chinese are a little agile with their naming. I think the discriminator is the 50V and 5A rating.

I'd caution, however, the subject of this thread and that mine, bought April/17 required the opto-isolators replacing.

[davies46]

OK thanks, I just bought two that look just like that, with the higher voltage and current rating. I can replace the optos as this thread details.

Meanwhile, I just ran a large job at 2x speed and it made it through the job twice without tripping, so maybe I'll be OK for milling polystyrene - will wait a while before putting the actual lump of wood under it though!

-Phil