Changing pt100 to standard thermistor
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ok so its just done it again, temp spiked instantly up to 1600, then 1k, and lower but all within seconds, and now its almost cold...
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can i save the set up files and perhaps default the board? perhaps flash it or start again? or will that not change anything?
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If it spiked to 1600C that suggests either an intermittent short circuit, or a short between the heater terminals and the thermistor wires, or ESD. These same causes would explain the error report "last error: short-circuit in sensor" you had when using the PT100.
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thanks, i guess you're right as i cant find any other fault i can see, so if the thermistor and heater terminals touch at the heater block that would also cause a short?
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@Atraedes said in Changing pt100 to standard thermistor:
thanks, i guess you're right as i cant find any other fault i can see, so if the thermistor and heater terminals touch at the heater block that would also cause a short?
It's not uncommon for heater cartridges to develop shorts between the element and the case, which connects the hot end metalwork to VIN. If you also get a short between the temperature sensor and the hot end metalwork, that will short the sensor to VIN.
If you have a connector in the sensor cable, check that connector. Sometimes a single strand of wire escapes the crimp and touches the other one.
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thanks, i will check that now, i only crimped that ruddy jst connector earlier and now that you mention it that seems the likely cause, many thanks
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must have been the thermistor connector in the board, changed it and steady now for 20mins, doing the first test...
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When did it give that M501 error? Did you send M501?
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i did and it still did it, thanks anyway, the machine has found its way out the window so its all good now, thanks anyway
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You don't send M501. You put it at the end of config.g and that's it.
When the duet powers on it runs through config.g to configure the machine. Then at the end it gets to M501 and then it knows to also load config-override.g, which has your tuned PID settings.
So when you sent M501 when the heater was running at 200c it re-applied any saved PID values it had saved in config-override.g from when you did the PID tuning and saved them with M500. That's probably where the fault came from.
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no i did as you advised, when the pid tune completed, i went into system in the web ui, and put m501 at the end of the config.g file, saved, it asked to reset it to save the settings and i checked it afterwards and m501 was still in the config.g file, was that not the way to do it?
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@Phaedrux said in Changing pt100 to standard thermistor:
PID tune, send M500 in console, add M501 to config.g. done.
Here's a guided example: https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+4:+Calibration/40#s161
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i first sent m500 from the console in the web ui at the end of the pid tune, that saved, then did as i thought you said in the config.g, as above
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thanks for the guide, i think i did all of this but perhaps i missed something, i will try again after ive checked all the cables again, many thanks
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I think you've got it, just trying to understand if the error was related.
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it must be something i missed, perhaps another bad connection, i think its due a full rewire to be totally sure, thanks again, good night
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@Phaedrux - Thanks again for your help with this, and everyone else, again, much appreciated! So I've swapped the heater block & heater cables, and no more errors! Cant be sure what it may have been as the entire hotend plate & all was new, upgraded from bowden rig to the sovol sv01 complete hotend as I had that laying around. So all resolved. If its not to much trouble, I'm assuming I need to change the feedrate now that I've changed my Chiron bowden setup to direct drive? How would i change and save it, thanks in advance
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@Atraedes said in Changing pt100 to standard thermistor:
I'm assuming I need to change the feedrate now that I've changed my Chiron bowden setup to direct drive? How would i change and save it, thanks in advance
If the motor and gear ratio is the same, it should be similar steps per mm. But you should probably recalibrate the extruder just to get it accurate.
https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+4:+Calibration/40#s165
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i had already calculated e-steps but realise now I didn't change it in the config.g file, so should be a simple edit config.g, change m92 to the new value, and as i already have m501 at the end of my config.g file just save and reset and good to go for that tune at least?
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@Atraedes
Yes.
