New hotend fan
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Hi All,
I have just installed a new Noctua fan for my ender 3 using the duet wifi 2. It's all gone pretty smoothly up til now. I have put the plug into FAN1 which goes into a buck converter reducing it down to 12V then to the fan. however, FAN1 is set to come on at 45degree which doesn't seem to be happening.
I thought it may be because my wiring was poor or the buck converter was the issue, so I plugged my spare 5015 blower directly into the 24V FAN1 plug. which even when the hotend gets above 45 degrees isn't turning on. Can someone help? config.g is below
; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
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; generated by RepRapFirmware Configuration Tool v3.1.4 on Wed Sep 16 2020 13:09:04 GMT-0600 (Central Standard Time); General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"Jack's Printer" ; set printer name; Network
M552 S1 ; enable network
M586 P0 S1 ; enable HTTP
M586 P1 S0 ; disable FTP
M586 P2 S0 ; disable Telnet; Drives
M569 P0 S1 ; physical drive 0 goes backwards
M569 P1 S1 ; physical drive 1 goes backwards
M569 P2 S0 ; physical drive 2 goes forwards
M569 P3 S0 ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E3 ; set drive mapping
M350 X16 Y16 Z16 E16 I1 ;a configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E93.00 ; set steps per mm
M566 X900.00 Y900.00 Z12.00 E1200.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00 ; set accelerations (mm/s^2)
M906 X600 Y600 Z600 E600 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout; Axis Limits
M208 X0 Y0 S1 ;set axis minima NEW 22.09.2020
M208 X230 Y220 S0 ;set axis maxima NEW 22.09.2020
;M208 X-5.5 Y-10 Z0 S1 ; set axis minima
;M208 X220 Y220 Z250 S0 ; set axis maxima
;M208 X-5.5:220 Y-10:220 Z0:250 ; set axis minima and maxima NEW ADDED 22.09.2020; Endstops
M574 X1 S1 P"X Stop" ; configure active-high endstop for low end on X via pin xstop
M574 Y1 S1 P"Y Stop" ; configure active-high endstop for low end on Y via pin ystop
M574 Z1 S2 ; configure Z-probe endstop for low end on Z; Z-Probe
M950 S0 C"exp.heater3" ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speedsG31 X-10 Y-20 Z0.5 ; set Z probe trigger value, offset and trigger height NEW 22.09.2020
M557 X30:215 Y0:200 P6 ; define mesh grid NEW 22.09.2020;G31 P500 X-31 Y20 Z0.5 ; set Z probe trigger value, offset and trigger height
;M557 X5:185 Y5:205 P6 ; define mesh grid; Heaters
M308 S0 P"bedtemp" Y"thermistor" T98801 B4185 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0
M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120C
M308 S1 P"e0temp" Y"thermistor" T98801 B4185 ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit; Fans
M106 P1 S1 H1 T45 C"Hotend Fan" ; Set fan 1 (Hotend fan) Thermostatic control. Turns on when hotend reaches 45c
M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1 B0.5 C"Part Cooling" ; Set fan 0 (Part cooling blower) G-code controlled. Thermostatic control is turned off
M950 F1 C"fan1" Q500 ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T45 C"Hotend Fan" ; Set fan 1 (Hotend fan) Thermostatic control. Turns on when hotend reaches 45c
M950 F2 C"fan2" Q500 ; create fan 2 on pin fan2 and set its frequency
M106 P2 C"Board Cooling" S1 ; set fan 2 name and value. Thermostatic control is turned on; Tools
M563 P0 S"Extruder 01" D0 H1 F0 ; define tool 0
G10 P0 X0 Y0 Z0 ; set tool 0 axis offsets
G10 P0 R0 S0 ; set initial tool 0 active and standby temperatures to 0C; Custom settings are not defined
; Miscellaneous
M575 P1 S1 B57600 ; enable support for PanelDue
M501 ; load saved parameters from non-volatile memory
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
T0 ; select first toolAlso if someone can tell me how I put this into the standard black box that everyone else seems to be able to display the config.g in i repost as I'm sure it way easier to read
Any help much appreciated
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@PRIOR123 said in New hotend fan:
I have just installed a new Noctua fan for my ender 3 using the duet wifi 2. It's all gone pretty smoothly up til now. I have put the plug into FAN1 which goes into a buck converter reducing it down to 12V then to the fan. however, FAN1 is set to come on at 45degree which doesn't seem to be happening.
the important thing is how you wired the negative terminal. if you connected that to the buck converter you can actually damage the duet. the buck converter is not mean to run on pwm.
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this is how you should wire the buck converter
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Thanks Both!, I've currently moved it to the always-on point because I thought it no longer matters because the fans are silent. but I would like to use this properly. Though like Veti has said I have a bad feeling that I have damaged the board. if you can you are able to advise how I can test if I have this that would be a huge help.
But thanks for the links, i thought i was going to need a buck converter per fan the way i was wiring it. This makes it MUCH more efficient!
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If you've verified that the fan is working when connected directly to vin or an always on fan terminal, then you can test it on each fan port by itself sending
M106 P0 H-1 S1to enable fan0 port at full speed. P1 for fan1 port, P2 for fan2 port.There's always the chance that a fan mosfet has been damaged.
Do you see any damage to the tiny chips near the fan port?
https://duet3d.dozuki.com/Wiki/Connector_and_spare_part_numbers#Section_Fan_mosfet
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@Phaedrux Soo this issue has now got a little bigger. I tried M106 P0 H-1 S1 and the 5015 blower worked fine and there weren't any other fans plugged in at the time. I then put one of the new fans in and it wasn't happy at all and the entire board went funny like it was shorting. so I turned all power off, now it doesn't seem to like the fuses, I have changed them a couple of times even though they have NOT blown. it seems that when this 'short' happens I need to wobble/remove and reinstall the fuses and everything is fine again. I now think it could be down to a bad earth point. I have checked the PSU and it's fine. But when I try and test the earth pin on the plug and the chassis of the ender 3 there is no noise on my multimeter. Is there a separate earth point for the duet board? in my head, it would seem unusual to have this but I'm not an electrical/electronic engineer. Any ideas?
Also I did check the mosfets and everything looks fine I will upload a picture in a minute
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That looks like a blown mosfet.
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@Phaedrux oh haha, pardon my ignorance but what does that mean? is it repairable? is it the reason for all my current issues?
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@PRIOR123 said in New hotend fan:
pardon my ignorance but what does that mean?
A MOSFET is an electronically controlled switch. Basically, it's what turns the fan output on and off. Yours has exploded, and the most likely reason is that the voltage was reversed when you connected the fan or buck converter. Note that this is the FAN2 MOSFET, marked TR1. The FAN0 and FAN1 MOSFETs (TR5 and TR9) look okay (but may not be).
is it repairable?
Yes, but you'll need some specialist equipment. See https://duet3d.dozuki.com/Wiki/Connector_and_spare_part_numbers#Section_Fan_mosfet
There are a number of forum members that offer repair services, depending on your location: https://forum.duet3d.com/topic/13875/community-repairsis it the reason for all my current issues?
Related to Duet, most likely (less so other personal issues!). It's possibly failed shorted, or partially shorted. Removing the MOSFET may cure this (though leaves the FAN2 output inoperable), hard to say.
Ian
