IMPORTANT ISSUE with bed temp controller
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@jrockland Do you mean that your relay turns on if you take off the ! from the duet config? or is the duet's output turning on when you remove the !
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@Luke-sLaboratory not the ssr's, im testing the board with a meter right now. relays had been tested and work good.
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@Veti yea I looked at the picture and it is what we use.
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@jrockland said in IMPORTANT ISSUE with bed temp controller:
yea I looked at the picture and it is what we use.
what picture?
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@Luke-sLaboratory the relay turn off as soon as they are not fed power
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@Veti looked online for ssr relays
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@Veti you are right, they are ntc 3950. Ill have to find out how to change that
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@jrockland said in IMPORTANT ISSUE with bed temp controller:
ntc 3950
they are not the best and become inaccurate at high temperatures.
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Anyway thank for all the answers, tones of thing to look at;
like why my board seem to work the opposite way ? (compared to my other 6hc's)
Stop.G files (that files is empty ??)
thermistor: wrong model ? (ill have to find how to change that)
port 0.out instead of 3.out (will move some stuff around)
Also I will add an external fail safe (I should had done that long time ago)Just to reassure anyone, the relays does shut down as soon as I send a M999/M112 or shut the board off. even if they are written as "!out.3".... maybe the connection to the board is wrong.
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if you use out0 don't forget to add power in for it
Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is
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@Veti I know, but with what I use them for they are easy to get and cheap..: I prototype parts so I actually destroy parts as a daily task. I basically apply change, then run the project until it break. then make it better. I crashed so many hot ends I buy those sensors in 50 packs XD
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@jay_s_uk wait.. just want to make sure im not wrong here.. i mean C"io0.out".. my bad. too much power out of OUT0.
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@jrockland said in IMPORTANT ISSUE with bed temp controller:
the relays does shut down as soon as I send a M999/M112 or shut the board off.
This is positive.
Could you post model #'s or pictures of the relays used? Still want to get to the bottom of why you overheated by a considerable margin
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@jrockland
you forgot the most imporant part. the frequency for the ssr. -
@Luke-sLaboratory let me check, Ill have to open an other part of the machine for that.
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@Luke-sLaboratory Actually when I read the code, bang bang mode wasn't deactivate, might explain a lot. it always been deactivated but that specific machine crashed hard before the last update and we had to re write the whole thing.
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@jrockland If the previous configuration was bang-bang, and instead we're using PWM @500hz, that could be a huge indicator of an issue.
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@Luke-sLaboratory Ill have to read more about bang bang but if I check on my other machines it is deactivated everywhere
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Using an inverted heater output isn't safe. When you power up, you are relying on the Duet booting up and running that M950 command to turn the heater off. If any of that fails (for example, something prevents the Pi from running, e.g. the SD card goes bad), then the heater will remain on.
What connection are you using that requires an inverted heater output?
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 -
@jrockland info on the relays would still be useful, but yes, probably should look into disabling PWM control if it was previously operated bang-bang and it was successful.
