Part Cooling Fan not working BTT Octopus MAX EZ - New VC4 Build
Hi, I am having an issue getting my Part Cooling Fan to work on my new Octopus MAX EZ board and EBB42 Toolboard. I have set the 12v jumper on one of the FAN ports on the board and have plugged the PWM on the Toolboard according to the build guide but the fan will not spin. I have tested with a second 4028 fan but still nothing. The PWM displays in Mainsail. I have continuity along the wiring so that seems good. My 24v electronics FANs work fine when the steppers start so the 24v rail works. How can I check that I am getting 12V from the FAN port on the Octopus MAX EZ???
Any help would really be appreciated. I hope its not a faulty 12v rail on a new board...
Solution:Jump to solution
Hi, I have managed to get the fan working by connecting the 12v to the MFAN port. As soon as the printer powers on the fan spins at 100% so it's getting the 12v it needs. I am guessing the 4 2pin VFAN ports have an issue with the 12v rail and the MFAN must by using a different 12v rail. Looks like it's a faulty Board... Now just need to get it replaced by BTT.
9 Replies
The Max EZ has 3 LEDs on it for the various rails - are all three lit up when on?
You'll need a multimeter to see if the 4028 fan is getting 12v
The build guide is for the standard octopus board, and my guess is there isn't a configuration setup for the PWM wire being on the toolboard. I might be able to give you the config changes you need to make, but you need to verify voltage is correct to the 4028 first (and that it is getting power)
Also, what option did you choose in the configuration tool?
Yep all 3 are lit, the 12v, 5+ and 3,3, but the 3.3 is red not green. I followed the standard octopus setup which uses PA0 on the toolboard for the PWM and then I have 12v running back to the Octopus which I have plugged into FAN0. What I have noticed is that there is a Green light on next to the 12v jumper, but when I increase the Fan speed on Mainsail the the light dims and turns off at 100%. Do I check the 12v on the 2 pin FAN port with the Multimeter??
The 3 lights sound good (3.3v is always red, not sure why they made it different).
You can just check at the fan/where the fan connects to the extension you made. If you have 12v there, both the port and the fan should be 12v then. What method of control did you select for the 4028 when running through the configuration tool? With mainsail open (the web browser page), click on configurator on the left hand side, then click on setup wizard on the left, then on the right click on "hardware selection" (you don't have to go through the configuration tool again) and tell me what you select for "Part Cooling Fan." After that, hit the button in the bottom left to go back to mainsail. Don't actually need to make any changes right now, just want to see what you selected
You can just check at the fan/where the fan connects to the extension you made. If you have 12v there, both the port and the fan should be 12v then. What method of control did you select for the 4028 when running through the configuration tool? With mainsail open (the web browser page), click on configurator on the left hand side, then click on setup wizard on the left, then on the right click on "hardware selection" (you don't have to go through the configuration tool again) and tell me what you select for "Part Cooling Fan." After that, hit the button in the bottom left to go back to mainsail. Don't actually need to make any changes right now, just want to see what you selected
Im sure its the Digital PWM 2pin on the Toolboard. I can't check as the printer is at my work and I am home right now. I wasn't expecting anyone to get back to me this quickly!! lol.
Will you only get 12v to the fan (Molex connector) when you turn the Fan on via the Mainsail GUI??
That sounds like the correct setup. I believe the port should give 12v once powered up but will have to check when I get back to my printer tonight
Thank you, I would really appreciate that.
So it won't deliver the 12v from the port until you enable the fan using the fan slider in mainsail.
Other thing I thought of - when you go to 100% on the 4028, you mentioned the light by the fan header going dim. Does the LED light corresponding to the 12v rail also go out at this time? Sometimes the Octopus Max EZ struggles to deliver the power the 4028 needs and trips the eFuse on the 12v rail. I've run into that in the past, and power cycling the printer resets the eFuse
Other thing I thought of - when you go to 100% on the 4028, you mentioned the light by the fan header going dim. Does the LED light corresponding to the 12v rail also go out at this time? Sometimes the Octopus Max EZ struggles to deliver the power the 4028 needs and trips the eFuse on the 12v rail. I've run into that in the past, and power cycling the printer resets the eFuse
I've not had the chance to test this today but hopefully I'll be able to tomorrow. I can't say I remember the LED on the 12v rail going out but that would make sense. How can you tell if the eFuse blows? You say power cycling resets this but I've never been able to get the 4028 to spin.
When testing the 12v power I still disconnect the Fan at the molex connector enable the fan in mainsail and then test the pins with a multimeter?
Solution
Hi, I have managed to get the fan working by connecting the 12v to the MFAN port. As soon as the printer powers on the fan spins at 100% so it's getting the 12v it needs. I am guessing the 4 2pin VFAN ports have an issue with the 12v rail and the MFAN must by using a different 12v rail. Looks like it's a faulty Board... Now just need to get it replaced by BTT.