Thread: 1632 drum sander burn out

Bob,
Give us a photo? I presume you are talking about the speed controller for the platter. I've got a 22/44, if you post a photo of the board, I'll check mine out, could be the same.

Thanks KevM

I did actually attach a photo. I don't know what happened to it.

Here it is again.

I have since got on to Carbatec and talked to one of their technicians who was kind enough to send me a photo of the original board used in these sanders. The one supplied here is actually a little bit different and uses a slightly modified arrangement on the PC board.

However, I discovered that the component that had blown to bits was a triac of type BT137. I went to Jaycar and got a replacement triac and soldered it onto the board. BANG.

"Oh bother" I said gently, "It must be something else that caused the triac to blow". So I checked the diodes and found that one of them had gone short and was allowing the a/c current to pass directly into the triac. I now know that triacs really don't enjoy a close association with a/c current.

I am just about to replace the diodes and triac and test it all again. The original design had a 2 * 1.5amp diodes on the board; I only have 1 amp diodes here so I will piggyback a couple of them together and try it again.

Bob,
looks like I found this thread too late, or at least, you seem to have things pretty much sorted. I've got a sander similar to this one:
http://www.carbatec.com.au/store/ind..._430_2940_2950

and I can open it up and take a photo of it helps, butI don't know when I can get to it.

Mick

gday Bob.........bummer!

Is it the controller that runs the feed belt that has burnt out?

Ive got one too and notice the big motor gets very hot after 15 minutes of running, even in winter. So I'm wondering if you were running it for along time when it burnt out?

Originally Posted by journeyman Mick

Bob,
looks like I found this thread too late, or at least, you seem to have things pretty much sorted. I've got a sander similar to this one:
http://www.carbatec.com.au/store/ind..._430_2940_2950

and I can open it up and take a photo of it helps, butI don't know when I can get to it.

Mick

Thanks Mick but it is a big job to open and inspect the little motor. Also, it isn't really necessary now but heaps of thanks anyway. See continuing saga below.

Originally Posted by martrix

g'day Bob.........bummer!

Is it the controller that runs the feed belt that has burnt out?

Ive got one too and notice the big motor gets very hot after 15 minutes of running, even in winter. So I'm wondering if you were running it for along time when it burnt out?

Thanks martrix,
Yes it was the controller, but that was a symptom, not the primary fault.
Also, yes, I had been running it for a while, but not actually using it all the time as I was also cutting strips of timber on the band saw to feed into the sander.
the story goes on. ..

I tried the new triac with two 3 amp diodes and as soon as I turned it all on again, BANG. .. "Oh dearie me" I muttered, "It has happened again."
Anyway, about this time I decided to take the rotten thing into Carbatec. The electrician there took out one of the brushes and told me that I would need a new motor as that one appeared to have burnt out (after only about 20 hours use) and that will cost you $125 plus if you want a new circuit board another $45. "OK," I said, " if I must then I must." "Oh botheration,I haven't got and money or cards with me, will you trust me for the day so that I can get it all up and running tonight?"
"Sorry, can't do that mate"
I am seriously thinking of repairing this one, selling it and getting a bigger and better Jet or Performax one. Maybe even a wide belt sander instead. The major problem is room.
So this problem has taken up my whole day and still not been resolved completely.

Finished up taking most of two days to get it all fixed up and running again.Now I don't trust it.