Frequency Discrepancy Between Two Duet2Ethernet Boards
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Are both boards running the same firmware version? Send M115 to check.
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Printer One:
2/12/2020, 12:50:46 PM M115
FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 3.0 ELECTRONICS: Duet Ethernet 1.02 or later FIRMWARE_DATE: 2020-01-03b3
Printer Two:
2/12/2020, 12:50:52 PM M115
FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 3.0 ELECTRONICS: Duet Ethernet 1.02 or later FIRMWARE_DATE: 2020-01-03b3
I also based the settings for the second printer off the ones I got working on the first one. So they have identical everything except the part cooling fan frequency.
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Do you see a control (slider) for these fans in Duet Web Control? If so, does moving slider lead to any insights?
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@Danal That's how I have been controlling the speed % and can tell at which speeds the fan turns on/off.
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Excellent.
Here is an absolutely weird long shot: DWC does cache certain thing about the configuration, and can potentially store them on browser local storage (that is the PC or Mac), and/or it can store certain things in a file on the Duet itself.
Again, a long shot... Try a completely different browser or PC. If you've been using Chrome, use Brave or Edge. Etc. See if there is any difference.
Edit: Oh... and turn OFF the setting to store configuration on the Duet SD card.
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Just tried on Edge and Firefox (I use Chrome, usually) and it didn't work. I also have a PanelDue attached and adjusting using that, instead of Duet Web Control, also doesn't make a difference.
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Yeah, it was a shot in the dark.
Well, you have a very intriguing mystery on your hands. I am truly stumped for things even to diagnose this! Maybe sleeping on it...
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Do you have an oscilloscope? Tried to look at the output PWM signals?
(even a cheapo DIY kit should do https://www.aliexpress.com/item/32588011154.html )
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Just to confirm, you've moved the same fan between both printers to eliminate the fan itself, right?
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@zapta I have access to one. That seems like a lot of unnecessary work at the moment, though. Maybe if it's the difference between getting a replacement board and being stuck with this one (assuming this second board is faulty), then sure, I'll do a little diagnostics work like this.
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@Phaedrux I have tried all three fans I have on all 3 ports -- fan0, fan1, & fan2. One is on the first board, as described above, and it has the same issues on the second board that the other two fans have. The other two fans are new and were purchased at different times -- about a month apart.
Edit: All the fans work fine on the first board.
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How about swapping the 24v power supplies between boards (or boards between power supplies)?
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Are the fan voltage select jumpers in the same places on both boards?
Are you getting 24V out of the fan ports when they are full PWM? CAUTION: be VERY CAREFUL when measuring it - users frequently short the fan pins together when trying to measure the output voltage, and that blows the mosfet.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
@dc42 said in Frequency Discrepancy Between Two Duet2Ethernet Boards:
CAUTION: be VERY CAREFUL when measuring it - users frequently short the fan pins together when trying to measure the output voltage, and that blows the mosfet.
Oh so true <sigh>
