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Psychokiller1888 / Vertex-Delta-Firmware

An unofficial firmware for the Vertex Delta 3D printer
GNU General Public License v3.0
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Support for heated bed #5

Open Psychokiller1888 opened 5 years ago

Psychokiller1888 commented 5 years ago

The main board has a 14v output. Using 2 or three diodes it can easily be taken down to 12v for a 200w heated bed like

https://www.ebay.com/itm/3D-Printer-Round-Silicone-Heated-Bed-12v-24v-heat-plates-Dia-180mm-260mm/192070208772

Thermistor value is 60

This setting has to be off by default and editable on the machine directly, for turning on and pin setting

chuebsch commented 5 years ago

Never use the 14V output of the K8800 board for anything like a heated bed, or you will burn the bed or the power supply. You will need a 300W or more external power supply, an appropriate MOSFET and a 4.7kOhm pull up resistor.

Follow this thread if you like: https://forum.vellemanprojects.eu/t/building-a-heatbed-for-k8800/29826

I got the same silicone heat pad yesterday. I think thermistor value 75 is better suited for this as 60 is just generated by a script.

Psychokiller1888 commented 5 years ago

Hey, thanks for the info! Yeah, pretty much figured out I would have enough amps for 200w

About the thermistor, are you sure? 60 is the actual correct declared one?

chuebsch commented 5 years ago

... more than 16.7 Ampere! No, I'm not sure but comments in Configuration.h say 75 is for silicon pads and then I did a plot in Gnuplot. Gnuplot thermistors 13 60 75 60 has a lot of points but looks like stairs