Spikes in Heat Beds causes faults
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Hello all,
I have an interesting one today. We run a machine which has 9 individual heat beds. These heat beds are controlled via the duet web interface as can be seen in the attached picture. The problem we have is that there are these temperature anomalies which appear to be completely random. Sometimes they are fast enough to not cause a problem other times they take to long to return to the requested temperature and then returns a fault.
I realise I have not given much information regarding the equipment and will gladly do so. First though I'd like to find out if anyone else has seen something similar to this?
Any help would be greatly appreciated.
Cheers,
Andre
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It looks like a bad connector or cable to the thermistor.
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@c6d looks like an intermittent short in your wiring. When shorted, the temperature reading will typically be 2000C, and when open circuit it will be -273C. Could also be inference from something else, but that usually looks more like noise on the signal rather than sharp jumps.
I'd go through and check all the wiring and connectors -
Thank you very much for your responses. I will check the wiring.
The one thing to note though is that the machine is not moving and these spikes occur so all the wiring is static. With this in mind would you still think it's the wiring?
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@c6d looking at the traces, your temperature trace isn't very stable, so even though it may not be moving, things will be expanding and contracting a bit which could cause an intermittent issue. Equally could be a connector/wiring as the current is turned on/off - looks like you get the spikes always on a temperature rise
