Fried Z1284PI on duet 3 6HC

stefvandermeer

Hello,

I am afraid i got fairly lucky while working on my new tool changing 3d printer. I was testing stepper motor functions for a custom tool lift when i was greeted with the smell of fresh burning electronics. after I noticed the smell I killed the power to the mainboard. after closer inspection I was unhappy to see the Z1284PI was burnt. I am puzzled about the cause of this occurrence, the stepper motors I was testing where plugged into one of my 3hc expansion boards. the fact that a component on the mainboard shorted somehow seems odd to me since the mainboard was not powering anything apart from some LED lights. after I killed the power I tried powering the duet with my desktop power supply with the usual 24 volts, the 24 and 12 volt rails where working appropriately but the 3.3 and 5 volt rails weren’t.
before this all motors where working fine but somehow I couldn’t get the sensor inputs to work, but this could also be a problem with the switches I am using.

stuff plugged in: (duet 3 6hc)

steppers on out0 to out5
bed heater on out0
24v led strip on out2
bed thermistor on temp1
panel due on io0
duet 3hc thru can bus
Z end stop on io1
bed probe on io2
tool lift end stop on io3

stuff plugged in: (duet 3 3hc) 1 and 2

stepper motors on first drives of both boards

I hope someone out there can help me out.
thanks in advance

Stef

dc42

@stefvandermeer I'm sorry to hear that your board has failed. Please tell us:

What version Duet 3 main board was it?
What sort of LED strip was it driving, and how many LEDs were in it?
What VIN voltage do you use?
When did you purchase the Duet 3?

stefvandermeer

@dc42

I bought the board in July in preparation for my upcoming printer build. The board was version 1.0. I am powering the printer with a 24 volt meanwell powersupply, I could provide the model number of this unit when needed. I was just powering a 50 mm section of 24 volt led strip to use as a work light.
I hope this information helps,

stefvandermeer

@stefvandermeer the Led strip I was using was only 9.6 watts per meter and I was only using 50 mm

T3P3Tony

@stefvandermeer it looks like there was a fault that damaged 5V regulator. What confuses me slightly is you said that the only thing being powered was the LED lights but it looks like a lot more was connected.

The Z1284PI has over current protection so it should shut down in a normal short condition not get damaged.

@dc42 may have a few more questions.

T3P3Tony

@stefvandermeer Please contact warranty@duet3d.com to arrange a replacement as in a normal overload situation the regulator should shut down, not blow. that said i would very carefully check your wiring for everything plugged into the 6HC for shorts. when you get the replacement board I would plug things in one at a time and test between adding each connection in case there is something with an odd fault causing this.

stefvandermeer

@t3p3tony alright, I will contact warranty support thanks for your help and I will be more careful next time