bed heater problem

swrightlast · 20 Oct 2019, 23:11

bed heater led constantly flickers, accompanied by constant ticking sound during print. how do i fix?

fcwilt · 20 Oct 2019, 23:26

Hi,

Is your bed heater running in PID mode or in "bang-bang" mode?

How is the heater itself connected to the Duet?

Frederick

swrightlast · 20 Oct 2019, 23:32

how would i know if it's in pid?

fcwilt · 21 Oct 2019, 00:15

Hi,

When you configured the heater for the bed you would have specified it in a M307 command.

You can execute a M307 command from DWC to report the current setup.

Frederick

Veti · 21 Oct 2019, 05:52

also see the documentation
https://duet3d.dozuki.com/Wiki/Gcode#Section_M307_Set_or_report_heating_process_parameters

but its normal for the heaters to pulse, that is the pwm signal to limit the power transferred to the heater, so it can stay at the desired temperature.

Phaedrux · 21 Oct 2019, 19:13

What type of bed is it?

swrightlast · 22 Oct 2019, 17:55

Thanks guys for all your input. I've solved the problem. I had an automotive type relay installed between the PS and Duet that certainly did the job of taking the bed heater current drain off the board, but it was noisy as heck as it approached the set bed temp. Removed the relay and wired bed heater straight to the board...problem solved.

swrightlast · 23 Oct 2019, 17:35

I've been upvoted...it didn't hurt, I feel fine, but what does it mean?

Veti · 23 Oct 2019, 17:40

@swrightlast said in bed heater problem:

I've been upvoted...it didn't hurt, I feel fine, but what does it mean?

someone liked your post or found it helpful.

Phaedrux · 23 Oct 2019, 17:53

It's like getting a high 5 for being awesome. Or a thumbs up.

swrightlast · 23 Oct 2019, 18:02

Thumbs up to the thumbs up......over and out!