Possible Grounding Issue

[upper skiff]

Could use some help working through this issue with my Orbitool SO2 communication issue. I’ve outlined a lot here: https://github.com/RobertLorincz/Orbiter-Toolboards/issues/27 I have also pasted the response from the maker on this entry.

My ground runs from the IEC inlet (stock from my sender 5 Pro) to a wago that splits to either side of the bay and then to a screw/nut on the frame. I do have another grounding point on the left side of the bay.

All the equipment I’m using is listed over on my build log for Planny: #1228757965981614154 message

[tawny kayak]

I keep hearing about these things... Im worried they have qc issues

[upper skiff]

They do! Robert admits that they had bad/sub-par parts from the manufacturer for a batch of the boards that went out in the fall last year. They are working to revamp it and release out new boards. They are sold out every where.

Heck the port where you plug in the cable at the top came off mine!

I wonder, if this wasn’t a solid connection, would it be contributing to the comm failure? 🤷🏼‍♀️

[tawny kayak]

yes!!! you need to resolder those

[upper skiff]

Yep!! I’m planning on doing that. But if they weren’t a great connection to begin with ….

[upper skiff]

I worked up an updated diagram of my wiring since it's really difficult to see it on photos. I realized that the wago on the left (green) isn't connected directly back to the house earth circuit (except if you count over the frame itself). Looks like the SSR and the 5V dedicated PSU for the raspberry pi are grounding to that connection. I'm thinking it might fix my issue if I remove the connection to the frame from the wago on the left and run that back to the main ground wago on the right, which does go to the earth circuit.

Can someone double check me?

[tawny kayak]

yes, you need to ground that to the bed. the rest of the wiring looks good, but dont trust me for the rest of the wiring lol

[delicate imp]

Just for curiosity, why have both a PSU and RPi switch?

[tawny kayak]

oh yeah actually...

[upper skiff]

I have the separate PSU for the pi because it's an rpi5 and it needs a dedicated solid power source - if that's what you're asking.

[delicate imp]

Sorry, I mean why specifically a sperate power switch (or outlet?) for each?

[upper skiff]

Oh cause I wanted to be able to shut down the printer separately. Slamming off the RPi when I've got a need for an emergency shut down makes my stomach churn. Yes I have the ability for that in klipper but my default knee jerk reaction is to cut power

Basically want to be able to gracefully shut down the compute of the rpi

[delicate imp]

I ask because I have a similar system configuration but without using a dedicated Pi power switch. Instead, I toggle the printer power using a relay.

The Pi is always on and one of its GPIO pins tells the relay to toggle the power for the PSUs.

Just another way to go about your problem 🙂

[upper skiff]

So question.... If I'm grounding to the ac earth ground in my house, do I need to ground the frame to the house as well? Or.... Is one connection from the frame to the house ground sufficient? I'm thinking that because I have two points of ground on the frame and the AC bed grounds to the frame, it's a low level open circuit through the frame..... Then the daughter board of the Toolhead board that is screwed into the frame piece in the eBay might be tripping when touch a metal piece of the frame...
Follow me?

I'm thinking I need to move that board to a din rail and remove the second ground screw in the frame.

[bronze tide]

I don't like that your one power supply isn't directly connected to your ground buss. It's technically connected through the frame, but I don't truss that. Having a second ground on the frame won't hurt anything. I don't think it is necessary. If you got a bigger wago and connected you left wago ground to your right wago. The other option would be to run your left frame ground to your right frame ground. I don't know that it's causing your issue. In my experience with grounding I want the best connection possible back to the main grounding point. For me that's not the frame.