Changing pt100 to standard thermistor
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@Atraedes said in Changing pt100 to standard thermistor:
Supply voltage: min 26.3, current 26.4, max 26.5, under voltage events: 0, over voltage events: 0, power good: yes
Your power supply seems to be tuned a bit high. Can you carefully check the output voltage with a multimeter?
Are you sure your hotend heater cartridge is 24v?
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@Atraedes said in Changing pt100 to standard thermistor:
@Phaedrux said in Changing pt100 to standard thermistor:
M305 P1 T100000 B3950
so M305 P1 T100000 B3950 is the g code for the standard epcos 100k thermistor i can install instead? and then just wire it to the conventional thermistor terminal instead and simply remove the daughter board?
Correct.
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@Phaedrux i thought so to lol, but the multimeter is at the inlaws and i cant get it back, lockdown lol, but thanks, i will check it when i get it back
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@Phaedrux fantastic, many thanks, so programme the G-Code first and then wire it in, or it doesn't matter? I cant say for sure about the heater cartridge as i have so many spares lying around it might very well be a 12v but I didn't think it was due to its size, but now that i can rewire to the standard thermistor i have the complete hotend for the direct drive rig, sir, thanks again for your assistance, much appreciated!
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If your PSU has a trim pot for adjusting the output voltage try giving it a slight tweak and see if it reduces the value in the M122 a bit. Aim for 24v.
Then if you connect your new thermistor and run a PID tuning see if the warning is the same. If it still estimates a 1000c+ max temp you should beware.
You can also check your thermistor resistance with a multimeter to see if it's closer to 12v or 24v, but.. multimeter...
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@Phaedrux thanks, ive just sent the comand and this came back, is this ok to now rewire or is there a problem? it says error...
M305 P1 T100000 B3950
Heater 1 uses PT100 (MAX31865) sensor channel 200, last error: short-circuit in sensor, 2/4 wires, reject 50Hz, reference resistor 400 ohms -
You should make the change to config.g and then reboot. You can rewire whenever you wish.
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@Atraedes said in Changing pt100 to standard thermistor:
M305 P1 T100000 B3950
actually the epocs is T98801 B4185
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@Veti said in Changing pt100 to standard thermistor:
M305 P1 T100000 B3950
Great, thanks, so instead then - M305 P1 T100000 B4185 ?
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@Atraedes said in Changing pt100 to standard thermistor:
; Tool 0
M307 H1 A1230.8 C312.7 D7.2 S1.00 V26.3 B0
M305 P1 X200 ; Set PT100 + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280Cgreat, thanks, so change it here in config :
; Tool 0
M307 H1 A1230.8 C312.7 D7.2 S1.00 V26.3 B0
M305 P1 X200 ; Set PT100 + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C
So change M305 to the code you said, change M143 to new max temp on new hotend, thanks again for all -
Hi @Phaedrux, thanks again for your help, it worked great, however, after i did the pid tune i tried to save it with M500 but it says "Warning: No M501 command was executed in config.g", ive since done a couple test prints also and it has flagged up "Error: Heating fault on heater 1" a couple of times, im stumped, the wiring is fine and checked, not sure where to go or why it doesnt take the M500 command
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@Atraedes You need a M510 at the end of config,g.
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thanks, tried it, it says "Warning: M510 command is not supported"
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https://duet3d.dozuki.com/Wiki/Gcode#Section_M500_Store_parameters
M500 saves to config-override.g, and M501 loads it. You need to add M501 to the end of config.g to load the saved values at startup.
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the sd card is buried deep in the machine also so i cant easily get to it without taking the bottom of etc.., i just assumed i could do everything via the console?
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@Atraedes Oops, i ment M501. The keyboard keeps reversing things.
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thanks again, so i made the changes you advised straight to the config files incl the config in sys folder on the sd card, loaded back into the machine, then ran pid tune, got this - "Auto tune heater 0 completed in 1489 sec
Use M307 H0 to see the result, or M500 to save the result in config-override.g", but then when i entered M500 via the console it answered - "M500
Warning: No M501 command was executed in config.g". Did i do something wrong? -
i then tried M501, and got this - "M501
Warning: Heater 1 appears to be over-powered. If left on at full power, its temperature is predicted to reach 692C.", feels like im back to square one lol, but the whole hotend, cables and all, are new, and confirmed 24v -
@Atraedes said in Changing pt100 to standard thermistor:
Warning: No M501 command was executed in config.g". Did i do something wrong?
add M501 to the end of your config.g
