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Fuse #23

Open beniroquai opened 2 months ago

beniroquai commented 2 months ago

@christiankuttke seems like we need to add an additional fuse between the input and the 12V terminals, correct? For the CE certification we need a bunch of additional information for the technical documentation. I have started adding the electrical diagram. Can you please review this?

You can open it via draw.io https://github.com/openUC2/openUC2_SOOP/blob/master/Technical_Documentation/Untitled%20Diagram.drawio

Untitled Diagram drawio

@ranranking anything's missing? ;)

christiankuttke commented 2 months ago

From the 12V Meanwell AC/DC power supply datasheet: https://www.meanwell.com/Upload/PDF/GST90A/GST90A-SPEC.PDF

image

So I don't think an additional fuse would make sense. If it needs one for compliance, then I would go for a car fuse (in-line holder) because they are rated for 12VDC and available in many different amperages. If bought from Amazon, they are ridiculously over-rated though https://www.youtube.com/watch?v=B90_SNNbcoU

For extra effort, we can buy an assortment of automotive fuses and I can test their actual trip current with my lab power supplies.

If we want a self-resetting fuse, I found this, which is probably a cool choice: https://www.digikey.de/de/products/detail/littelfuse-commercial-vehicle-products/0UCB005-X/2518878

beniroquai commented 2 months ago

Got it. Thanks! I think this is 100% regulatory madness. It should not be self resetting and mostly for the case of water inside the box. If you can find a part on digikey that holds the fuse that would be perfect. Should have 5A, FF rating, correct?

christiankuttke commented 2 months ago

OK. Form-factor automotive blade mini (ATM):

Holder: https://www.digikey.de/de/products/detail/littelfuse-commercial-vehicle-products/0FHM0003ZXJB/3427032

Fuse 5A: https://www.digikey.de/de/products/detail/littelfuse-inc/0297005-WXNV/146583

The datasheet of the fuse admits they aren't very precise, so if we pull exactly 5A continuous, there may be differences in how long same-rated same-model fuses last. I feel the brand and getting them from Digi-key is a safe way of implementing this though.

beniroquai commented 2 months ago

Ok. thanks. Ordered!