To SSR or not to SSR
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Building a new coreXY printter using the Duet 6HC.
Im having a dilemma, ill be running two meanwell rsp 500 24, the first one will power the duet and the second one will power a 24v 410x410 heated bed.
Heated bed is 340-360w.
https://www.aliexpress.com/item/1005003056403054.html?spm=a2g0o.order_list.order_list_main.50.613118026jZegx
Measures 1,8ohmsThe cheap 80A SSR
https://www.aliexpress.com/item/10000011656519.html?spm=a2g0o.order_list.order_list_main.33.613118026jZegxDo is run the Out_0 power in from the PSU that runs the duet or the one powering the bed, when using an SSR? What about when not using an SSR?
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@Snippy 360w at 24v works out at 15A. here's a note from the docs
1 Note that the board is rated to 18A on the '15A high current output'; however it is supplied with a 15A fuse fitted (18A are difficult to source). If you need 18A on the this output then you need to fit a 20A fuse and take further precautions against over-current.so you'd need to change the fuse to a higher rating, then you should be ok
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@jay_s_uk
Are they mini or micro2 fuses? -
@Snippy mini
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''and take further precautions against over-current.'' any ideas on this?
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@Snippy a thermal fuse and a current limiting supply for example. Given that I would use the SSR...
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@Snippy Be very careful with the cheap chinese SSR , quality is really random .
i use these here for my heat bed and hotend
https://www.auberins.com/index.php?main_page=product_info&cPath=2_30&products_id=674
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@Snippy personally I would use an AC mains bed heater controlled by a DC-AC SSR for a bed heater of that size. If you want to use a 24V heater then the 6HC can drive a 24V 360W heater directly (just) using the standard 15A fuse.
Avoid cheap DC-DC SSRs, they are usually fakes.
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for low voltage high current dc powered bed you can also use external high power mosfet with a heatsink . usually will be cheaper then ssr .
