Problem- X axis encoder fault/smoke

[k4rd]

I have a 1991 BMC-20 that has been upgraded to Max-32 by a previous owner. Tonight while running the machine I got an x axis encoder fault then smelled the famous burnt electrical smell. When i opened up the cabinet smoke was rolling out of it, but i could not pinpoint the exact location is was comming from. I think i might have been comming from the X axis amp. Any suggestions and does any one have a clue as to how much $$ i am about to shell out to get this resolved. Thanks ahead of time.

[k4rd]

After getting some time to look at the machine I found I have a burnt suppresor board. Does any one have any suggestions as to what would cause this. I am not an electronics type person but I am assuming this board did its job and stopped any further problems. I am running the machine off of a 3 phase rotary converter.

[Al_The_Man]

Suppressors as the board says, looks like a raft of R/C suppressors, these are often used across AC inductive devices such as contactor coils etc.
They rarely fail unless an extremely large voltage is imposed across them.
It is strange to see a bunch together on a board, they are usually places at the inductance source.
You could have had a high voltage arc over to get that damage.
They are common items and if they have the values on them, you can even make one up.
Al.

[bloke]

Flip the board, trace the tracks and re-wire it to connect the unused suppressors instead. Failing that, scrap the board and buy a potted 3 phase suppressor for each contactor in circuit.

[k4rd]

First would like to say thanks to Al and Bloke for the answers. I ended up replacing the "smoked" board with some Electrocubes. It appears that went the board blew up, some debris from it landed in on my x drive which sits directly below and fried it as a result. After getting a new drive from Buddy at the hurcostore and Accurate Machine Tool service, I am up and running again. I just thought I would pass along some PDFs I found in my searches for a solution. Lonnie and Don at Hurco were also good helping hands in my search for a solution.

http://static.zoovy.com/merchant/red...SERVO_PACK.pdf