silicone bed heater SSR... "Delixi"?



  • I'm very close to purchasing a silicone heater (110VAC) for my printer. I've decided I'm probably better off paying for a known brand, so have been browsing the keenovo website. I'll probably end up getting the 280mm round, 500 watt heater with the built in 150C thermostat and NTC 100k 3950 thermistor to fit under my 300mm diameter bed.

    They also sell "Delixi" brand SSR's. I've never heard of Delixi, and I'm concerned about the potential for a cheap fire-starter.

    Does anyone know anything about "Delixi" brand SSR's? (These are the only ones available on keenovo's website.)

    Here's a direct link to the SSR on the keenovo store website: https://keenovo.store/products/delixi-ssr-40a480vac-solid-state-relay-input-3v-32vdc-40da

    Thanks
    Gary



  • I have not used that particular one, but I assume any SSR of any brand can fail closed and arrange the printer to be safe in spite of that.

    Primarily, a thermal disconnect.



  • May I be the first to say- it sounds "delixious" !
    ba-dum tish
    I'll be here all week, folks!



  • @garyd9, if you can afford it, I would go with a UL listed product from a legit source.


  • Moderator

    If you're in North America I recommend these: https://www.auberins.com/index.php?main_page=product_info&products_id=30



  • I take it from the various replies that no one has heard of "delixi." I wonder if keenovo would sell crap SSR's to pair with their own silicone heaters.

    @Danal said in silicone bed heater SSR... "Delixi"?:

    I assume any SSR of any brand can fail closed and arrange the printer to be safe in spite of that.

    That's the purpose of the 150C thermostat.. it's a resettable thermal disconnect if the heater hits ~150C.

    @Phaedrux said in silicone bed heater SSR... "Delixi"?:

    If you're in North America I recommend these: https://www.auberins.com/index.php?main_page=product_info&products_id=30

    This looks very similar to many cheaper SSR's... but even cheaper at only $15. I have to be completely honest in saying that $15 for a 40A SSR sounds too good to be true (and if I saw that price on ebay or amazon, I'd instantly assume a fake that would fail closed at a low amperage.) How familiar are you with these? (I'm assuming you're using one yourself...)


  • Moderator

    @garyd9 said in silicone bed heater SSR... "Delixi"?:

    I wonder if keenovo would sell crap SSR's to pair with their own silicone heaters.

    I doubt it, but I've never heard of the brand.

    @garyd9 said in silicone bed heater SSR... "Delixi"?:

    How familiar are you with these? (I'm assuming you're using one yourself...)

    Yes I've been using one for a year now of heavy printing on my 600w silicone heater. It gets mildly warm. I have it bolted to an aluminum extrusion with the thermal pad you can order along with it.

    $15 is reasonably prices for what it is honestly. Why should it cost more? It's made in china, but so is everything else. It's CE certified and Auberins is a large industrial goods supplier in the US. I trust it more than the aliexpress unit it replaced.


  • Moderator

    Also, if you do a search on these forums for Auberins, you'll see it's been recommended quite frequently, so there must be something to it.

    https://forum.duet3d.com/search?term=auberins&in=titlesposts

    They also have a DC-DC SSR which I've used as well. Be careful which you get though, the pages look very similar and the device is nearly identical if you're not paying attention.



  • @Phaedrux said in silicone bed heater SSR... "Delixi"?:

    Also, if you do a search on these forums for Auberins, you'll see it's been recommended quite frequently, so there must be something to it.

    Okay, I'll give it a try...

    For the heater, I ordered a keenovo 500Watt 280mm diameter 110VAC with thermistor and 150C thermostat (for safety cutoff.) I'll be mounting that under a 5-6mm thick slab of 310mm diameter aluminum.

    For the SSR, I'm ordering the Auber "40A AC SSR" I'll mount it directly to one of my delta's 2020 aluminum v-slot extrusions with t-nuts. There won't be full contact between the SSR and extrusion (because the extrusion is a v-slot, not a flat piece of metal. However, with < 5amps of power going into the SSR, I probably don't need any heat sink at all.)

    So, one more question that isn't quite directly related to this thread: How is the SSR wired with the duet3 and "out" connectors? With a 24 VDC heater, I had to run 24V to "OUT 0 POWER IN" to get 24V out of "OUT 0". That was done by adding jumpers from "POWER IN" to "OUT 0 POWER IN."

    Do I still need to do the same thing for attaching the SSR's DC IN? Or, would it simplify wiring if I just wired the SSR to one of the lower power OUT_x typically used for fans?



  • @garyd9 said in silicone bed heater SSR... "Delixi"?:

    Or, would it simplify wiring if I just wired the SSR to one of the lower power OUT_x typically used for fans?

    Yes, and yes. Added benefit of being pluggable for maintenance



  • Duet configuration is so flexible, you can wire it many different ways. Personally, I prefer the "default H0 heater" to still be the bed, ssr or no, and so I wire that way.

    You can see the heavy 24V wires to the "bed input" on a Duet 3 (the middle pair). I went heavy here BEFORE I decided to go SSR. These could be thin, and/or jumpers from VIN at the left.

    The thin white at the right head to the SSR. It is that simple.

    Note that SSRs low voltage side IS polarized, so you really should use a pair of wires of different color. With two whites, I just 'try it' and reverse it if it does not work.

    IMG_0329.JPEG


  • Moderator

    @garyd9 said in silicone bed heater SSR... "Delixi"?:

    I'll mount it directly to one of my delta's 2020 aluminum v-slot extrusions with t-nuts. There won't be full contact between the SSR and extrusion (because the extrusion is a v-slot, not a flat piece of metal. However, with < 5amps of power going into the SSR, I probably don't need any heat sink at all.)

    I do the same. To improve contact with the extrusion I got the thermal pad they sell with it for a dollar. Seems to work really well.

    The one thing I didn't like about this SSR is that the cover for the terminals leaves a fair amount of it actually semi exposed compared with the printed cover I was using before, so I used a bit of electrical tape just to cover it up more completely. I intended to CAD up and print a full cover but decided to just call it good.


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