Thermostatic fan for drivers
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Yes it's possible using firmware 1.19. See the description of virtual heaters at https://duet3d.com/wiki/G-code#M305:_Set_temperature_sensor_parameters.
You can also implement thermostatic cooling without an extra thermistor, by configuring a fan to turn on according to the readings from virtual heaters 100 and 101.
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Excellent! So, something like this should work:
M106 P1 S0.5 H101 T0:100
M106 P2 S0.5 H102 T0:100If I'm correct, the fans should run at half speed when there is not problem, and at full speed when over-temperature warning occurs. Is it a good setting?
I'm wondering if FETs (especially bed FET) need to be cooled when Duets are in a box?
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No, those M106 settings mean the fans will be off when the temperature is below threshold, and on at half speed when it is hot.
You should cool the PCB as a whole when the CPU or drivers are hot, not just the drivers.
I have my electronics cooling fan configured like this:
M106 P2 H100:101 T45:55 L0.3 ; electronics cooling fan
meaning turn on at 30% if the CPU temperature reaches 45C, and increase to full speed gradually as the temperature rises to 55C. Also turn it on a full speed if any of the main board drivers reports over temperature warning.
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Ok, thanks!
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Frederic,
What David has suggested will work fine but for info, if you want to see and display the driver temperature, then you need to stick a thermistor on it with a small dab of epoxy adhesive. The you can create a virtual heater using M305 and channel number from 102 upwards https://duet3d.com/wiki/G-code#M305:_Set_temperature_sensor_parameters. You can then use the "S" parameter to give it a meaningful name and view it on DWC under "+Extra". Of course you could also use this virtual heater to control a fan as per David's instructions.
HTH
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Yes, I think I will add some thermistors, in the future. For now, David's solution is fine.
Thanks for the tip.
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Frederic,
What David has suggested will work fine but for info, if you want to see and display the driver temperature, then you need to stick a thermistor on it with a small dab of epoxy adhesive. The you can create a virtual heater using M305 and channel number from 102 upwards https://duet3d.com/wiki/G-code#M305:_Set_temperature_sensor_parameters. You can then use the "S" parameter to give it a meaningful name and view it on DWC under "+Extra". Of course you could also use this virtual heater to control a fan as per David's instructions.
HTH
And when you have selected it with the Extra button you can select to have it shown on the Temp graph.
Doug
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Doug, can it also be displayed on the PanelDue?
Thanks.
Richard
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Thanks, David.
