Toolboard 1LC v1.3 wiring

[Arminas]

@droftarts I have one more question, but it's related to heaters and fans Q value:
"If using an SSR then set the "Q" parameter in the M950 command to a low frequency like 10 Hz." - what is the explanation of such a low Q parameter? In duet page it's also said to use 250Hz for fans and heaters. I took a standard RatRig config and fans there have a Q500.

Just trying to understand and choose the optimal parameters, thank you.

[droftarts]

@Arminas We choose default settings that are applicable to most situations. Check the datasheets for your SSR, fans and heaters if you feel they are incorrect for you.

An SSR can be switching mains voltage or a PSU. Every time it switches, it puts pressure on the supply, and the SSR will have a switching lifetime. Setting it higher will reduce the lifespan of the SSR and potentially the PSU.

Ian

[Arminas]

@droftarts "On-off time ≤ 10mS" - if this is the correct parameter of SSR to look at, it is 100 Hz. So Q should not be more than 100 Hz?

When my printer is heating the bed, lights in the room are flickering (Q was 10 Hz). So I tried to increase the Q parameter to default 500 Hz - flickering was gone, but bed temp was not stable. I thought I will find the sweet spot of Q where bed temperature is stable enough to not affect the print, but not too intense to make the light flicker.

[Arminas]

@droftarts Also, Q parameter may affect the electricity consumption as well?

[Arminas]

@dc42 what is the maximum air temperature for 1LC?

[droftarts]

@Arminas said in Toolboard 1LC v1.3 wiring:

Is this the SSR you have? https://ratrig.com/electronics/power-supplies-ssrs/clin-ssr-40a-relay.html
The closest datasheet I can find for this SSR is here: http://www.clin.cn/product-detail.asp?id=62 (the part number matches).

"On-off time ≤ 10mS" - if this is the correct parameter of SSR to look at, it is 100 Hz. So Q should not be more than 100 Hz?

That sounds correct, and 100Hz would be the absolute maximum switching rate it is capable of. At 500Hz, sometimes it is responding, other times not, which would lead to unstable switching and heating. I think half of 100Hz, ie 50Hz, would be the maximum I would want to set it to for longevity and to avoid it heating up. And even then, I think that would shorten it's life. Unfortunately the datasheet doesn't give any information on switching life or PWM rating. Caveat emptor, as they say.

Also, Q parameter may affect the electricity consumption as well?

How/why? I doubt it, unless there are significant power losses each time it switches. Or switching fast causes it to heat up. But then fast switching is likely going to put stress on the components of the PSU, too. I would tend to set the Q parameter as low as possible, to avoid the SSR heating up and because a bed doesn't need it to be very high as it is slow to heat and cool, but high enough that it doesn't audibly annoy you (they can click loudly) or cause other problems like flickering lights.

what is the maximum air temperature for 1LC?

This is something that we've been meaning to add to the documentation, but it is complicated. All Duet3D boards (other than the 23CL) have components only rated to 85C, so that is the absolute maximum, and doesn't take into account self-heating (mostly from stepper drivers, MOSFETs, etc). However, this can be offset if there is a fan or convective airflow to cool the board. Generally, we can use the on-board MCU temperature sensor to check it isn't significantly over-temperature, however the accuracy of these aren't great, and can be -11C to +6C out. Therefore, we are going to recommend an absolute maximum of 75C, as reported by the onboard MCU temperature sensor. But be aware that running close to that temperature is likely to shorten the life of the electronic components.

Ian

[Arminas]

@droftarts Okay, thanks. Regarding the max temp, I am planning to install the chamber heater, so I think I will have to add a small fan for the 1LC

[droftarts]

@Arminas What temperature are you planning on heating the chamber to?

Ian

[Arminas]

@droftarts I will try to reach 60C

[droftarts]

@Arminas said in Toolboard 1LC v1.3 wiring:

I will try to reach 60C

That should be okay, but monitor the temperature on the 1LC.

Ian