Unable to configure bed heater

Weevil

@phaedrux When the heater is first warming up from room temperature, there is a loud, continuous tone coming from the board. After it reaches the target temperature, the tone stops. Even when the temperature drops, the tone does not return when the board engages the heater to warm up again.
I am not sure if this helps but I have both outputs from my power supply feeding the 2 inputs to the board. When I first got the board, a Facebook group advised me to set it up that way.

Phaedrux

Well there is no speaker on the board so it's not a tone being generated by the firmware in that sense.

Can you capture a video of it? Perhaps a photo of your wiring as well?

What type/model of power supply are you using? Specs?
More detailed bed specs?

Other's have mentioned the board making a noise when heating up the bed as well.

Changing the PWM frequency usually helps. Add Q10 to the M950 for the bed heater.

Actually, looking at your heater config again, which heater is using which output?

; Heaters
M308 S0 P"temp1" Y"thermistor" T100000 B4138
M950 H0 C"out2" T0
M307 H0 B1 S1.00
M140 H0
M143 H0 S100
M308 S0 P"temp0" Y"thermistor" T100000 B4138
M950 H1 C"out1" T0
M143 H1 S280

Usually the bed would be using Out0.

@weevil said in Unable to configure bed heater:

I have both outputs from my power supply feeding the 2 inputs to the board. When I first got the board, a Facebook group advised me to set it up that way.

I assume you mean connecting the PSU to the bed power input (out0_in) but a photo will help clear that up.

Weevil

@phaedrux I have my power supply feeding these leads:

Weevil

@phaedrux I will check when I get home.

Phaedrux

@weevil said in Unable to configure bed heater:

I have my power supply feeding these leads:

Yes that makes sense if you're using OUT0 for the bed heater on the right side of that connector block. Your config shows only out1 and out2 being used.

Weevil

@phaedrux So, based on your comment, I do not need the power supply feeding Out 2 (middle connector block), just the left (Out 1/Power In)

Phaedrux

@weevil said in Unable to configure bed heater:

@phaedrux So, based on your comment, I do not need the power supply feeding Out 2 (middle connector block), just the left (Out 1/Power In)

Are you sure you mean out2?

Where you have the arrows pointing that you have the PSU connected is correct. The right connector on that block is OUT0, which is intended for the bed heater. It gets power from the block in the middle (out0 power in).

Weevil

@phaedrux I am worried I got it all wrong. I have my heater connected here:

Phaedrux

It would be best to use Out0 for the bed heater as that's what it's designed for (higher current capacity 15A). The other OUT# are intended for lower current items like hotend heaters (only 5A).

https://duet3d.dozuki.com/Wiki/Duet_3_Mainboard_6HC_Hardware_Overview#Section_Heating_Fans

Weevil

@phaedrux Okay, I got things straightened out.

That loud tone was coming from my APC battery backup. The printer is now plugged into a surge protector.
Bed Heater is now connected to OUT 0.
Confirmed bed heater calibration still works.

Thank you very much for the guidance.