Upgrade to 3.2.2 fan running full speed

Joel

Hi,

On my Duet2 WiFi, I just upgraded from 3.1.1 to 3.2.2. After the upgrade a fan I mounted for the stepper drivers ( fan2 port ) started running full speed.

I put the fan in and never configured it, so it ways off. Now with 3.2.2, I had to configure the fan and I just gave it a fixed speed.

Question is, is there an onboard sensor ( or from the drivers themselves ) that reports driver temperature?

I figure as long as I now have the fan configured and running, I would like to make it ramp up with driver temperature if possible.

Doable?

Thanks
Joel

Veti

post your config

fcwilt

@Joel said in Upgrade to 3.2.2 fan running full speed:

Question is, is there an onboard sensor ( or from the drivers themselves ) that reports driver temperature?

I asked about a new board, a Duet 3 Mini 5, and was told there was no built-in sensor.

They suggested I use a thermistor attached to one of the driver chips.

Frederick

Joel

Here is the fan config, but it's pretty irrelevant. The question is not about fan setup, but if there is a built in sensor that can be used. That answer seems to be no .

M950 F2 C"fan2" Q500
M106 P2 S.2 H-1 ; Fan speed fixed at .2

Thanks
Joel

droftarts

@Joel not on the drivers, though they report when over temperature. On Duet 2 you can monitor MCU temp and have a fan set up on that.

@fcwilt see https://duet3d.dozuki.com/Wiki/Calibrating_the_CPU_temperature?revisionid=HEAD#Section_mcu_temp_in_Duet3_Mini5

Ian

Joel

@droftarts

I did think of that, but I notice my MCU just never gets hot and I think it is too far removed from the drivers.

@fcwilt

If I ever open up my controller case, it would not be horrible to glue a thermistor to one of the drivers.

Thanks

droftarts

@Joel the stepper drivers use the ground plane of the Duet as a heat sink, as does the MCU, so the temperature of the MCU is a reasonable guide to the temperature of the drivers. However, for Duet 2 WiFi, you’re unlikely to need extra cooling unless your board is in a tight enclosure and/or you run the stepper drivers close to their current limit.

For cooling recommendations, see https://duet3d.dozuki.com/Wiki/Hardware_Overview#Section_Cooling

Ian

Phaedrux

For what it's worth, as long as you have some air flow and aren't using max current, you're probably just fine.

deckingman

....and one more "for what it's worth", I did in fact stick a bead thermistor onto one of the driver chips on my Duet Ethernet board and used it to control a fan blowing air on to the back of the board. I can't remember exactly what temperature range I used but it was something like start to turn at 40 Deg C ramping up to fully on at 80. The fan hardly ever came on and when it did, only very slowly. Even when printing at crazy speeds of up to 300mm/sec usiing motor currents of 1.8Amps. The board was vertically mounted and had plenty of space around it with lots of slats, so YMMV.

Joel

Well, sounds like I will just leave it at a fixed value ( quiet ) and not worry about it. I have been running it for over a year with the fan off, never had a problem.

Thanks

deckingman

@Joel.......and yet one more "for what it's worth". When I converted to Duet 3, I never got around to setting up the fan I fitted behind the main board. This one runs Nema 23s at 2.4 amps as is necessary to throw my 3Kg extruder gantry around. During testing, I periodically checked the driver chips with a finger tip and they barely got above ambient. So the fan still sits behind the board but I've never got around to connecting it. The board is open and not in an enclosed case so YMMV.