*EDITRealized that the power supplies were backwards. Fixed.
*removed grounds
Would this be OK for the 15v 5A PSU for the heater? I need more power for nylon.
]]>If you are going to do all that, you should think about upgrading to the Rich-josh-multi-material-mega-cooling-super nozzle.......as per previous postings.
That's still working great by the way. I've gone through a couple KG without any tolerance issues.
Just to be clear for those that don't know - Rich helped me come up with a solution for 3mm PC extrusion. I was having problems with tolerance (probably due to a high flow rate on the material I purchased, nonetheless the mod worked great). You shouldn't need it unless you're having a problem extruding 3mm, but I do like how it's easier to change to/from 1.75 and 3mm quicker - I don't have to take off any insulation or deal with re-taping my thermocouple. Just unscrew a small tip and you're done.
Read it here.
Here's a schematic that I threw together. It's a little crude, but hopefully it helps a little.
*EDITRealized that the power supplies were backwards. Fixed.
*removed grounds
Thanks Josh. think the fan is missing, But i got it.
]]>The above is correct, except that the power supplies don't have grounds.
My bad - that's an old habit from back in college where everything had to have a ground symbol or it was "wrong" haha
]]>
*EDITRealized that the power supplies were backwards. Fixed.
*removed grounds
When we are using 2 power supplies, is it going to be 2 independent circuits ?
If yes, how does it affect the connection b/w heater and stall protect ?
Yes, it becomes two separate circuits. The stall protection board is not connected to the heater in any way. Give me a few minutes and I'll put together a schematic for you.
]]>The benefit to using 2 supplies is load isolation, so the heater does not change the motor speed when it cycles on/off. The effect this makes on the filament is almost negligible, but if you're going to have the stock power supply on a shelf, might as well. Using the stock power supply also means you only need a 5 amp supply for the heater, instead of ~8 if you wanted to power the heater and the motor at 15 volts.
When we are using 2 power supplies, is it going to be 2 independent circuits ?
If yes, how does it affect the connection b/w heater and stall protect ?
The motor will turn faster at 15 volts. What I did was keep the original 12v supply and connected it to only the motor, and added a 15v supply to just the PID and heater.
Tim now has a PWM controller for the motor; in theory you should be able to run the motor at 15v with a lower PWM frequency to keep the same RPM but he would have to confirm that.
Was wondering if we can do something with the stall protect board ? there are 2 small screws to control the voltage and current. Can that be adjusted ?
Am not an electrical person, do you mind sharing the circuit diagram ? And wats the max temp you got with ur 15v psu ?
Sure, you can adjust the voltage and current all you like. The PID controller, heater,and stall protection board are all related for up to 18 volts DC.
The concern with giving the motor more than 12 volts is heat - if you can keep the temperature down, you can increase voltage. You can also reduce the PWM duty cycle by changing the CV adjustment if for some reason you don't want to use the included power supply to continue to power the motor.
The benefit to using 2 supplies is load isolation, so the heater does not change the motor speed when it cycles on/off. The effect this makes on the filament is almost negligible, but if you're going to have the stock power supply on a shelf, might as well. Using the stock power supply also means you only need a 5 amp supply for the heater, instead of ~8 if you wanted to power the heater and the motor at 15 volts.
]]>dineshwong wrote:And wats the max temp you got with ur 15v psu ?
I was able to get up to about 270 for polycarbonate extrusion with no problem.
I will throw together a schematic when I return to the office tomorrow
That would be great, thanks.. thats almost the same goal for me..
]]>And wats the max temp you got with ur 15v psu ?
I was able to get up to about 270 for polycarbonate extrusion with no problem.
I will throw together a schematic when I return to the office tomorrow
Also, the stall protection board and PWM controller are one and the same. Refer to its documentation or maybe Tim can throw in his two cents if he sees this.
]]>The motor will turn faster at 15 volts. What I did was keep the original 12v supply and connected it to only the motor, and added a 15v supply to just the PID and heater.
Tim now has a PWM controller for the motor; in theory you should be able to run the motor at 15v with a lower PWM frequency to keep the same RPM but he would have to confirm that.
Was wondering if we can do something with the stall protect board ? there are 2 small screws to control the voltage and current. Can that be adjusted ?
Am not an electrical person, do you mind sharing the circuit diagram ? And wats the max temp you got with ur 15v psu ?
]]>TheBaron wrote:If it ain't broke, fix it until it breaks again.
BINGO!
If it ain't broke, you don't have enough mods.
]]>