Post by 3DMS on Feb 4, 2016 12:20:21 GMT
If you happen to have 12V heatbed directly driven by the Ramps Mofset, if the heatbed power is too important you might blow up / burn your Ramps 1.4 Green Power terminal.
If this happen you Might need to either change your terminal using a new one:
or you might need to to change your Ramps board and take the proper precautions to avoid this issue in the future.
In order to do this you can use a DC-DC SSR relay that will handle all the power for you.
You can get some here:
3dmodularsystems.com/en/eletronic-components/109-relais-static-ssr-25dd-fotek.html
3dmodularsystems.com/en/eletronic-components/109-relais-static-ssr-25dd-fotek.html
The most common models are presented above.
For some reason using these relays with more than 1/2 the rated current will make them generate a lot of heat. So consider using them with application rated with half the relay max current.
Please use
In order to connect it to your existing heatbed you can consider at least 2 possibilities:
For some reason using these relays with more than 1/2 the rated current will make them generate a lot of heat. So consider using them with application rated with half the relay max current.
Please use
- SSR-25 DD for standard MK2/MK3 heatbeds (less than 12A/12V => max power around 145W)
- SSR-40 DD for power below 200W (less than 20A/12V => max power around 240W)
- SSR-60 DD for power below 300W (less than 30A/12V => max power around 360W)
In order to connect it to your existing heatbed you can consider at least 2 possibilities:
In this solution you can wire directly the PSU to your heatbed and SSR static relay.
You will need thick wires for the power side (on the right) connected to both SSR and PSU. Here we are using 2.5mm² silicone insulated flexible wires.
Note that you don't really care about the diameter of the wires that will drive the SSR, as you won't need any power (wire connecting pin 4 and 3 of the SSR)
You will need thick wires for the power side (on the right) connected to both SSR and PSU. Here we are using 2.5mm² silicone insulated flexible wires.
Note that you don't really care about the diameter of the wires that will drive the SSR, as you won't need any power (wire connecting pin 4 and 3 of the SSR)
If you only have 2 outputs available because you are already using a box with only 2 outputs .
You will need to use some electrical terminals (domino) to interconnect the wires.
Here again the wires providing power to the heatbed need to be thick (2.5mm² here).
and the one driving the SSR (at the bottom), connecting pins 3 and 4) can be any diameter, as they are just signal wires driving an optocoupler.
Please share your comments, ideas and so on!
You will need to use some electrical terminals (domino) to interconnect the wires.
Here again the wires providing power to the heatbed need to be thick (2.5mm² here).
and the one driving the SSR (at the bottom), connecting pins 3 and 4) can be any diameter, as they are just signal wires driving an optocoupler.
Please share your comments, ideas and so on!
