I think I may have destroyed my Duet 3 6HC

[Ben 0]

Today I did something really stupid, I wired a switch in the 240v side of my 24v 600W power supply backwards, and then immediately tripped the RCD on that circuit when I flipped it to on. I reset the house, wired it up properly and tried again but the power supply was dead, no surprise there. Then I put my crappy old 12v 360W power supply on and the board actually booted up and looked ok, but when I asked a stepper to move I got an error saying ''Attempt to move motors when VIN is not in range" which has got me thinking that something is seriously wrong on the board as well.

So, while I wait for my new power supply to arrive, is there anything I can do to test the Duet? I'd really hate to have to replace it as it will take me ages to save up for one again!

[weed2all]

@ben-0 cheap psu might not have 12v on output...did you tried to see with a multimeter if the cheap 12v psu actually have 12v output? If it have less than 12v it may power the board but when you try to move motor won't work...test it and get back with info!I recon the voltage requirements are 12-32v for 6HC board!

[fcwilt]

@ben-0 said in I think I may have destroyed my Duet 3 6HC:

I wired a switch in the 240v side of my 24v 600W power supply backwards

What do you mean by that?

Frederick

[Ben 0]

@fcwilt 240 volts wired backwards into the power supply, positive to negative, negative to positive, but I got the earth right at least ...

[Rushmere3D]

@ben-0 What switch are you trying to use?

[rjenkinsgb]

@ben-0 said in I think I may have destroyed my Duet 3 6HC:

240 volts wired backwards into the power supply, positive to negative, negative to positive, but I got the earth right at least ...

It's still not clear what you did?

240V AC does not have positive and negative; swapping live and neutral, as long as you are still connecting 240V to the AC input terminals, should have no effect.

Did you connect 240V to the 24V terminals? If so, where were the DC cables for the Duet connected at the time?

[Ben 0]

@rjenkinsgb live to neutral, into the 240v conector on the power supply. My fuse box and destroyed power supply disagree with you about it being no problem sadly

[rjenkinsgb]

@ben-0 said in I think I may have destroyed my Duet 3 6HC:

live to neutral, into the 240v conector on the power supply.

Did you exchange live and neutral, or put both on the same terminal?
That would definitely blow fuses or pop breakers etc!

There must be something more than simply swapping L & N??

[dc42]

@ben-0 said in I think I may have destroyed my Duet 3 6HC:

Then I put my crappy old 12v 360W power supply on and the board actually booted up and looked ok, but when I asked a stepper to move I got an error saying ''Attempt to move motors when VIN is not in range" which has got me thinking that something is seriously wrong on the board as well.

When you run M122 what does it report for the VIN voltage and the 12V rail voltage?

[fcwilt]

@ben-0 said in I think I may have destroyed my Duet 3 6HC:

@rjenkinsgb live to neutral, into the 240v conector on the power supply. My fuse box and destroyed power supply disagree with you about it being no problem sadly

I am surprised that happened.

What brand and model of power supply was it?

Thanks.

Frederick

[Ben 0]

@dc42 That's got it! the VIN was showing as 10.2 so I've adjusted that with the trimpot on the supply and it's reading 13 on VIN and 12 on the 12v rail! Thanks for your input everyone, really appreciate it!

[Ben 0]

@weed2all sorry, I seem, to have glossed over your reply! I was in a bit of a tizzy yesterday, wish I'd picked this open up sooner

[dc42]

@ben-0 if you have a multimeter then I suggest you check that the actual voltage corresponds to the value reported by M122, in case you have overvoltage on the 3.3V rail which would cause VIN to read high.

[weed2all]

@ben-0 so the issue was solved right? The cheap psu didn't output 12v as expected...you may want to put "solved" on the thread title...glad you sorted out!