The 24v relays should be connected to the main board input power and switch when it switches. this was why there is a 4th relay on the other design. If you add a 4th relay that has a 5V coil to switch the 24V relays, then you can use a 5V pin triggered by the board. I don’t know how to do this in Marlin either. In marlin, the brakes are not as critical because falling is much less of an issue because it doesn’t shut off the motors each time you change the configuration. Typically there is a G84 at the end of your gcode file put in by the slicer to shut off the motors. If you remove that G84 motor shutoff command and have the bed go to its lowest point (max Z) at the end of each print then it will only drop the last little bit when the power is cut or you manually turn off the motors when there isn’t another planned print.
My relays have a 24v + and - coming from the 24v power supply and a negative coming from a heater pin to trigger. I only have 3 relays. This was how Ryan suggested I hook it up and it has been working great for me. Only issue I had was trying to use the Z to trigger the relays. It wasn’t fast enough. But by switching to X then no matter what it will always trigger first before Z so they are ready to go.
the heater has 24 coming off off it to trigger it. so that works. the enable pin to the 2209 was 5V, so that was what I used.
Yes I follow you now. My bad. It does work out well that you can have either 24v or 5v relays and still get the same effect. I came close to using an 8 channel relay board I have just to try out shorting both coils. But I was extremely pleased with how it did with one coil shorted. Will be installing them on the V4 real soon. Hopefully these 2 skr desk ornaments I have will be the only 2 I end up with LOL
I wonder if the desk ornaments just need new regulators or if the cpu is toast
From this post I ordered the parts that were suggested and have them at home. But I just don’t think I have near enough experience to make the part swap my self. And then really no way to know if anything else is damaged either beyond that. I know for a fact that chip on both boards is toast. Makes a nice bic lighter sized flame when it happens LOL.
I did that with an endstop miswire. The repair attempt pulled the pad of the regulator off the board
Yeah that one is just in a spot that’s not worth me even attempting to repair. Talked to @MakerJim about repairing it but I know he has a ton going on so I didn’t want to keep bothering him with it.
At this point if another one goes I’ll just replace it with a Manta and be done with it. So much nicer not having to have everything separate
What size wire and pin type are you using for the 24v power. I ask because on the octo relays the input port is pretty small and you have to double splice a lot of the wires, don’t want the wires to heat up to much.
I think it’s 24 or 26. I can’t remember for sure but it’s not big at all.
I’ve been distracted the last month with some family members’ having health issues.
But, I’m back slowly to catching up.
I’ve had some success fixing up some other boards that I came by- so if you’d like me to attempt to rescue a board- I"m game to try that. For the learning experience, no guarantees of success.
24 or 26 are too small, even for just board power if you’re not running heaters.
I just picked up some fork terminals off of amazon- I’ll make some test cables and if I’m happy with those, I’ll paste a link.
I’m about to start prepping an SKR pro that I fixed from a batch that I came by- and was going to use it as my Klipper test bed and maybe as a controller to finish out my stalled Repeat V4 as I instead build up a V5.
I get that for sure and I am in no rush at all. They are not currently needed for anything. I did order those parts so I can send them to you when I get back in town at the end of April. And I expect no guarantee at all.
I looked again at what I ordered, Its 22. But this was not for board power. It was just to power the 3 relays. Board power is coming from this
It was working good for the little bit of testing I was able to do before I left. If I run into any issues I will replace that power supply with a meanwell 24v. But with mains powered bed heater I shouldnt need that much power.
Ok, first off, don’t judge my wire management, its a WIP since I tore up a lot of it to put in these Z brakes. I plan on cleaning this up once I’ve proven that everything is working properly, then ill re-wire, mess something up and have to go through all my checks again lol.
This is how I think these relays should be wired up based on the help from forum, particularly @Jonathjon and @orob
I decided to power the relays with 5V source from the boards empty limit switch ports, I was worried about running 24V power on these smaller diameter wires, and from what I can gather from the steppers themselves, 5V should be sufficient. And I think this should work because limit switch power using the pins I have chosen from the board should always be on when the board is on.
I thin used the HEAT1 (PD14-) for the signal source
Assuming all this is correct, I think I can now try to break stuff in Marlin.
Once my new connectors come in from amazon, ill clean this up, looking pretty ratty atm. My dream is to build a harness from scratch the right way for my entire rig, but that may be a pipe dream for the time being
if the relay coil says 24V, then power it from 24V. If it says 5V, then the 5V from the endstop is fine. Don’t those relays have a trigger pin and + and - power for the relay?
Meanwell 24V power supply is what I have chosen as well mostly because I remember some of my electrical engineer collogues saying that this brand will have fewer issues than the cheap ones off amazon.
The meanwell is what I have on my V4. I went with the smaller one from Ryan for the V5. He is going to do some current draw test and make sure we aren’t asking too much from it. The little bit I was able to run mine before I left it was doing fine
The relay is 24VDC, but can I not use 5V to power it when the relay is in its low level trigger mode?
Until I get better connectors to use larger gage cable for 24V power directly from the power supply i figured this 5V setting was enough to prove out its function
DC+ is 24, DC- is ground and IN is the 5V trigger pin from the control board. I think you have it right, we are just misunderstanding the descriptors of the setup.
Oddly the higher the voltage the thinner the wire needed. No worries though they draw very little current so it does not matter. But if it is a 24V relay you need to give it 24V, the trigger pin is 3.3-5V.
So in my description im powering the relays with the power coming from the empty limit switch I have circled in that image above, and switching coming from the heater pin, which is 24V.
The lights i expect to be on, on the relays are on but what is sounds like is.
- I should change my DC power going into the relay to 24V from the power supply instead of from the limit switch pins.
- I should change my trigger setting on the relay to “High” instead of “Low”