Vcore4 IDEX - Part fan cooling stopped working
I have been printing alot of high temp filaments where part cooling wasnt relevant but recently tried to print PLA and had to find out that the part cooling fan on both toolheads wont turn on no matter what.
Now smart as I am I reset the whole printer and tried debugging everything only to realize that I did not make a backup.
I know the fans worked previously (hard to overhear when they spin up).
The voltage supply works and I have checked with my multimeter that both fans get a 12 V supply.
The white PWM cable however does not seem to do much i.e. looking at it with my oszilloscope i can see a 50 Hz signal but not in any way shape or form the PWM cycle.
I am honestly quite stumped as to what could cause this and would be happy about help or pointers in the right direction.
I have appended the RatOS.cfg as well as the barebones printer.cfg
~ What am I missing?
Add 13:00 : added the following to printer.cfg
[fan_generic part_fan_t1]
cycle_time: 0.00004
Now I have a visible PWM signal on top of the 50 Hz curve ~ Fan still does not turn on
Furthermore I dont know how why or since when but it seems that the voltage supplied to the fan is inversed (-12 V instead of +12V)
Solution:Jump to solution
Apparantly many moons and many more coffees ago I had decided to wire the Ground wires of the two fans into HE2 and HE3 respectively. This worked quite well for all this time but apparently somewhere along the way (maybe a firmware update of the octopus board) the board changed its behavior to output -24V on the - pin ~ Or this was something i set in my config file and forgot about.
2 Replies
Solution
Apparantly many moons and many more coffees ago I had decided to wire the Ground wires of the two fans into HE2 and HE3 respectively. This worked quite well for all this time but apparently somewhere along the way (maybe a firmware update of the octopus board) the board changed its behavior to output -24V on the - pin ~ Or this was something i set in my config file and forgot about.
Glad you found your answer! Bear in mind that if these server fans have power but no pwm signal they will go full blast for safety's sake. So them not spinning means they're not getting power, or they're getting a valid pwm signal of zero