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smoothol

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dc42

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smoothol

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dc42
For a heated bed of that size, you should use one of the following:

1. AC mains voltage bed heater, driven using a DC-AC SST. Only do this if you are knowledgeable about and comfortable with doing mains voltage wiring.

2. A 24V bed heater (in which case you may as well run the entire printer on 24V, assuming you use 24V-capable electronics). The bed heater will draw 13.75A. Some electronics can handle this current directly (e.g. the Duet 0.8.5 should be OK at this current). Otherwise, use a good (low drop) DC-DC SSR or the Power Expander from reprap.me

could I not use 12v heatbed and a SSR with a higher amp resistance for instance 50A RRS?

Bad idea. Dealing with such high currents is not nice, and keeping the resistance low enough is not easy.

ahhh okay i may switch to 24v then.... so to sum it all up theres no way of controlling the temperature of the heatbed from the MKS board??

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smoothol
12v means high current which = fatality


lol


so should i do the same set up as you with an automotive relay?
please could you share the component and wiring details :)

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Beer4Brew
330W but what is voltage? 12V or 24V, 330W/12V=27.5A or as dc42 say 330W/24V=13.75A
So You buy SSR acording to that equation.
Didnt work with other relays so I cant give You advice which one to buy, I hooked up Automotive relay 12V 50A that is low cost works like a charm (printing 12 hours a day for a month now with no problems) but if You need help with wiring, any relay that You choose I can help, or You just need to read schematic of relay its not that difficult, will make instructables of my ups and downs in next couple of days after returning from IMOT, will eat, drink beer and try to sell prints while am there:)-D:)-D

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dc42

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smoothol

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dc42
For a heated bed of that size, you should use one of the following:

1. AC mains voltage bed heater, driven using a DC-AC SST. Only do this if you are knowledgeable about and comfortable with doing mains voltage wiring.

2. A 24V bed heater (in which case you may as well run the entire printer on 24V, assuming you use 24V-capable electronics). The bed heater will draw 13.75A. Some electronics can handle this current directly (e.g. the Duet 0.8.5 should be OK at this current). Otherwise, use a good (low drop) DC-DC SSR or the Power Expander from reprap.me

could I not use 12v heatbed and a SSR with a higher amp resistance for instance 50A RRS?

Bad idea. Dealing with such high currents is not nice, and keeping the resistance low enough is not easy.

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smoothol

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dc42
For a heated bed of that size, you should use one of the following:

1. AC mains voltage bed heater, driven using a DC-AC SST. Only do this if you are knowledgeable about and comfortable with doing mains voltage wiring.

2. A 24V bed heater (in which case you may as well run the entire printer on 24V, assuming you use 24V-capable electronics). The bed heater will draw 13.75A. Some electronics can handle this current directly (e.g. the Duet 0.8.5 should be OK at this current). Otherwise, use a good (low drop) DC-DC SSR or the Power Expander from reprap.me

could I not use 12v heatbed and a SSR with a higher amp resistance for instance 50A RRS?

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Beer4Brew
330W but what is voltage? 12V or 24V, 330W/12V=27.5A or as dc42 say 330W/24V=13.75A
So You buy SSR acording to that equation.
Didnt work with other relays so I cant give You advice which one to buy, I hooked up Automotive relay 12V 50A that is low cost works like a charm (printing 12 hours a day for a month now with no problems) but if You need help with wiring, any relay that You choose I can help, or You just need to read schematic of relay its not that difficult, will make instructables of my ups and downs in next couple of days after returning from IMOT, will eat, drink beer and try to sell prints while am there:)-D:)-D

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dc42
For a heated bed of that size, you should use one of the following:

1. AC mains voltage bed heater, driven using a DC-AC SST. Only do this if you are knowledgeable about and comfortable with doing mains voltage wiring.

2. A 24V bed heater (in which case you may as well run the entire printer on 24V, assuming you use 24V-capable electronics). The bed heater will draw 13.75A. Some electronics can handle this current directly (e.g. the Duet 0.8.5 should be OK at this current). Otherwise, use a good (low drop) DC-DC SSR or the Power Expander from reprap.me

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Beer4Brew
Guys thx for all help but if You want silicone heated bed and You have some prusa i3 variant You can do like me I use 12V 360W 30A power supply for LED lights bought for 30$ sillicone heater 12V 280W that I hooked up to automotive relay g.cartier 12V 50A and I dont have extra power supply just hooked it up to that power supply for my prusa and thats it in a minute my bed gets hot to 50C.

If someone need help with wiring let me know.