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ZXAtari

Automatic Power Off after print

by ZXAtari Jan 5, 2019
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Nice idea, but with a huge and life treatening making. Your printer runs on a 12 or 24V DC System, which has no ground on the components. Now you put a 220 V AC Voltage switch on a not grounded frame. Man you play with your life or the life of the system.
You have a live switch with AC Current and you don´t make a holder or so to get a secure insulating of the contacts to the frame?
Where do you think will the 220 V AC Voltage go incase of a shortcut to the frame?
Right, it will go straight into your internal DC Components and will fry everything.
So please make a separat ground of the incoming Voltage to the frame to make sure that you FI will fly out instead
of killing yourself. The idea is nice but before you play with seperate voltages (DA/AC) in a system talk to some electricians.

Update! New, better, safe version is published. Go there for it!

https://www.thingiverse.com/thing:3335522

Automatic Power Off after print V2 - low voltage version
by ZXAtari

Hi. Thank you for your remarks.
You are mostly right. It's high voltage. That's why I wrote several times about risks for non-skilled users.
Grounding - my printer IS grounded and came grounded from the factory. I believe it's even required by EU regulation.

Ground cable is connected to psu chassis and whole frame through mounting screws. On the top of this everybody should have differential switch in home electrical system.
In summary power cable shorten to the frame will immediately trigger home safety system.

I will prepare low voltage version and publish it soon.
Added announcement about this in thing description.

The problem is that you put the AC Input Voltage directly on the not grounded frame.
Your frame has no ground, is insulated by rubber feets. So the only way that a shortcut can go
is to stay on the frame, that means 220 V AC life voltage and you fry yourself by contact.
The other was is going back over your 12V DC Motors and the PCB, then it will find the ground
and everything is fried. So you need a cabel from the ground of the power supply to the frame,
that you have a security of shutoff with the FI.

Hi again Markus.

There is no problem.
As I wrote before, frame IS grounded thorugh quite thick two screws fixing PSU to it. They are even more thick than potential small screw with extra cable. That's why factory is not using this extra cable, probably.
To not "just discuss" but speak about facts I've made measurements supporting my words.
I will not elaborate big grounding metal sheet dug near my home, thick cable leading to it, fuses, earth leakage circuit breaker and home cabling.
Starting from my desk:

  1. (1.jpg) - printer power cable with ground connetors
  2. (2.jpg) - connection between PSU chassis and frame (0.2 Ohm is the resistance of my test leads which is shown on 3.jpg)
  3. (3.jpg) - test leads (multimeter cables) resistance
  4. (4.jpg) - whole "system" grounding - from the 230V plug to the frame

Best Regards
Piotr

Comments deleted.
Comments deleted.

Man, this is a brilliant idea! It is so easy and reliable.Good job. I'll install it into the printer.

Thanks!
12/24V version will be prepared soon. Little more parts but much more safety.

True and always is safety is the most important thing.Idea is great but need a slight improvement.

True and always is safety is the most important thing.Idea is great but need a slight improvement.

Update! New, better, safe version is published. Go there for it!

https://www.thingiverse.com/thing:3335522

Automatic Power Off after print V2 - low voltage version
by ZXAtari