Blinking bed heater LED, no heat
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Thanks. Everything looks in order.
I would suggest PID tuning the bed again starting at room temp and saving the results with M500.
Hopefully it's just a fluke.
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While writing the above, the heater faulted again:
rror: Heater 0 fault: temperature excursion exceeded 15.0°C (target 80.0°C, actual 64.6°C) -
Thanks, @Phaedrux - I try the PID tune....
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Can you post a screen shot of your temperature graph?>
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@1d1 said in Blinking bed heater LED, no heat:
The bed connector is factory new (except where I changed terminals for the thermistor).
Is it possible the thermistor is losing physical connection to the heater? Or a wiring fault? Failing thermistor?
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The thermistor readings remain consistent. Trying to heat the hot end to 250 and the bed to 80, it reaches the target temp and gradually loses temperature until it faults - as if it can't somehow maintain that level. The temperature graph is steady and solid, reflecting exactly what is happening. Could it be the SSR is failing? The wiring all looks good and it has worked solidly for appx. 5 years. It has to be either the bed or SSR I think. And as the bed is new....
that's why I'm here trying to figure this out. -
While I don't have another SSR on hand, I was just now able to find the machine specific MOSFET. I guess I'll be trying that out next.
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The Duet bed heater mosfet can handle up to 18a so you could connect the bed heater directly to the Duet. No SSR or external mosfet required.
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@Phaedrux Well, that would answer that question! I'll try that first.
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That did it! So far at least... When I first got the machine, it was burning out cheap PSUs so the company's solution was to send out new beds and PSUs along with this monster MOSFET. I got an SSR while the boat was coming from China and all was well until a few days ago. The Black Widow was a heavily flawed machine but I have upgraded, rebuilt, and poured a huge amount of time and money into it - and learned a lot. It is currently a tank after this last attempt to get it right. Let's hope it works as it should - thanks repeatedly, @Phaedrux. You caught me in midair again!
