Hi everyone!
I have a RAMPS 1.4 board. Today I connected all the wires, including the ones for heated bed and extruder, providing double power supply to the RAMPS shield.
I started a print, everything works fine but this morning I saw a little bit of smoke on the board while heating, so I decided to disconnect the heated bed and extruder and move them away with a dedicated relay connected directly to the 12V/30A power supply.
Disclaimer: I saw smoke on the double power supply connector, no component is damaged, I guess it was just too much current.
Everything works perfectly, but when heating the extruder Marlin sends intermittent on-off to the extruder, so the relay makes a lot of noise.
If I set it to 190°C, Marlin goes to 180°C, shuts down the extruder and begins powering it on and off, and it continues even if the temperature was reached. As you can imagine the relay at this point will make noise as it is being powered on and off very quickly.
It doesn't happen with the heated bed, if I set it to 60°C, it reaches 60°C and then shuts down the relay, which will be powered back on when the bed goes under 60°C. It just makes 1 click at time.
I know my explaination probably is not good enaugh (I'm not a native english speaker) so I'm attaching a video which demonstrates the issue.
Since the forum doesn't let me upload videos greater than 600K I'm providing the link on youtube: https://youtu.be/B_Z7ZK587SI
Is there a way to change this behaviour? Do I have to switch to a transistor instead of a relay?
Thank you
I have a RAMPS 1.4 board. Today I connected all the wires, including the ones for heated bed and extruder, providing double power supply to the RAMPS shield.
I started a print, everything works fine but this morning I saw a little bit of smoke on the board while heating, so I decided to disconnect the heated bed and extruder and move them away with a dedicated relay connected directly to the 12V/30A power supply.
Disclaimer: I saw smoke on the double power supply connector, no component is damaged, I guess it was just too much current.
Everything works perfectly, but when heating the extruder Marlin sends intermittent on-off to the extruder, so the relay makes a lot of noise.
If I set it to 190°C, Marlin goes to 180°C, shuts down the extruder and begins powering it on and off, and it continues even if the temperature was reached. As you can imagine the relay at this point will make noise as it is being powered on and off very quickly.
It doesn't happen with the heated bed, if I set it to 60°C, it reaches 60°C and then shuts down the relay, which will be powered back on when the bed goes under 60°C. It just makes 1 click at time.
I know my explaination probably is not good enaugh (I'm not a native english speaker) so I'm attaching a video which demonstrates the issue.
Since the forum doesn't let me upload videos greater than 600K I'm providing the link on youtube: https://youtu.be/B_Z7ZK587SI
Is there a way to change this behaviour? Do I have to switch to a transistor instead of a relay?
Thank you