12v and 24v…Sorry for asking, I just don't want to do anything wrong
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You can use a SSR to control the bed if you wish regardless of whether the SSR is using the same PSU as the Duet or a different one. If they are both using the same 24V supply, then connect one pair of wires from + and - output terminals of the power supply to the Duet. Put a 5A fuse in series with the positive lead if you wish. These wires do not need to be heavy gauge. Then make a separate bed heater circuit using heavy gauge wires connected to a different pair of output terminals on the power supply.
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Thank you so much David. I understand what you are saying. First of all, thank you soooo much for your contributions to the 3d world!!!!!!! Can you see anyway to drive the DuetWifi with the 24v Meanwell supply and yet use the 12v Meanwell for the fans with the fans still being controlled by your Duet so that they are not just always on? Or am I just going to have to switch everything to 24v? Thank you once again Sir.
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To use a separate 12V supply for the fans, connect the negative output of that PSU to the negative output of the main 24V PSU. Remove the fan voltage select jumper from the 3-pin header strip and connect the positive output of the 12V power supply to the centre pin of that header strip. Do this carefully, because you will damage something if you short it to either of the other pins.
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I thank you once again for your help. It saves me alot of trouble.
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So I still plug the positive wire of each fan to their respective connector and I connect all the black wires of the fans to the negative on the 12v power supply?
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No, just connect the fans to the fan connectors on the Duet WiFi as usual.
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So I am new to using the DuetWiFi and I have a 300mmx300mm dimension system. I will be using a 120v heated bed. I have a lot of 12v Corsair RM650 12v power supplies. Would you recommend hooking those up to the Duet or should I get a 24v system to start out and make sure I get a 24v hotend etc. or do you recommend something else. I just want to do the best to begin with so I don't have to do it again. Thanks!
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If you plan to use 0.9deg motors, or high inductance motors, go with 24V. Otherwise you may as well use 12V IMO. I don't know that particular PSU but the Corsair CX400M that I was using for a while worked well.
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If I connect 2-12v DC terminals from the same power supply I should have only 12v DC correct? If I put them in parallel then I would have 24v DC and that should work for 24v correct?
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No, you can't get 24V out of a 12V PSU other than by using a boost converter.
