driver chip blown it

[Com]

Well I managed to blow one of the driver chips. Forgot about the little detail of not fiddling around with the cables to the motor while its on and now one of the driver chips has completly burnt out. Anyone know where i can pick these up in the UK?

[CNCadmin]

Hobbycnc will send you one I'm sure.

[murphy625]

Well I managed to blow one of the driver chips. Forgot about the little detail of not fiddling around with the cables to the motor while its on and now one of the driver chips has completly burnt out. Anyone know where i can pick these up in the UK?

What is up with this?

Did you just move the cable? Or disconnect it???

Murphy

[HobbyCNC]

What is up with this?

Did you just move the cable? Or disconnect it???

Murphy

I'm SURE it got disconnected if it blew the chip. "Moving the cable" has nothing to do with it.

Dave Rigotti
hobbycnc.com

[murphy625]

Thanks for the reply..

I was just making sure my head was screwed on correctly...

Murphy

[fragger6662000]

farnel or rs or maplins might have the correct fets if you want a uk supplier.
they will be expensive though.

matt

[Com]

Well i got the new chip, removed the old left over connections then soldered the new chip. Still doesnt seem right though, theres no burning smell but using my powersupply at 30V 3A and amps goes right up to 3 stright away and the fan is spinning as if somthing else is taking all the power. And the motors arnt doing anything. Ocassionly if i turn the amps right down them up again the fan picks up speed and the motors start doing somthing but only for a second before it goes back to drawing them all. I know from before the most the board with all 3 motors drew was 1.5 amps if they were idle.
I did do a ohm bleep test on all connections before i connected it all up to make sure nothing was connected to where it shouldnt be.

Any ideas?

[HobbyCNC]

Well i got the new chip, removed the old left over connections then soldered the new chip. Still doesnt seem right though, theres no burning smell but using my powersupply at 30V 3A and amps goes right up to 3 stright away and the fan is spinning as if somthing else is taking all the power. And the motors arnt doing anything. Ocassionly if i turn the amps right down them up again the fan picks up speed and the motors start doing somthing but only for a second before it goes back to drawing them all. I know from before the most the board with all 3 motors drew was 1.5 amps if they were idle.
I did do a ohm bleep test on all connections before i connected it all up to make sure nothing was connected to where it shouldnt be.

Any ideas?

Measure the voltage at TB5 over a few minutes. What's happening? Check the LM317HV. A small heatsink my be needed for it. A 1/8 by 1/2 by 2 alum will do it.

Dave Rigotti
HobbyCNC.com

[Com]

Assumining tb5 is the pull up connecters im getting 6.14v. Theres a heatsink on all 3 chips but the Y axis one seems to get extremely hot while the other 2 seem alrite.

[Com]

Seems tb5 is now 5.14v not 6.14v. Again the y axis chip is getting very hot. Im thinking that the Y axis chip is taking 99% of the current, because none of the chips are giving voltage to the motors and the fan isnt spinning at anywhere near even half speed. Any idea what has caused the y axis to do this?


Edit: the LM317HV doesnt even get hot so it doesnt seem to need one, its right next to the fan anyway.

[Live_SteamR]

COM,
Did you ever resolve this problem? if so what was done and what were the results?

[Com]

No i didnt resolve the problem in the end, i did buy a new chip and i installed it but then a second blew for no reason and nothing was working so i went and brought a different board. Its the way things go with electronics somtimes. Oh well.