Non-PWM hotend fan always on with thermostatic control

Velvia

Fan / heater config

; Heaters
M308 S0 P"temp1" Y"thermistor" T118000 B3950
M950 H0 C"out1" T0                                 ; create bed heater output on out1 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"temp0" Y"pt1000"                         ; configure sensor 1 as PT1000 on pin temp0
M950 H1 C"out2" T1                                 ; create nozzle heater output on out2 and map it to sensor 1
M307 H1 B1 S1.00                                   ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S450                                       ; set temperature limit for heater 1 to 450C

; Fans
M950 F0 C"out5"                                    ; create fan 0 on pin out5 and set its frequency
M106 P0 S0 H1 T60                                  ; set fan 0 value. Thermostatic control is turned on
M950 F1 C"out6" Q100                               ; create fan 1 on pin out6 and set its frequency
M106 P1 S0.5 H-1                                   ; set fan 1 value. Thermostatic control is turned off

; Tools
T0
M563 P0 S"DragonHF" 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

The hotend cooling fan is always on, even when below 60C.

M122

M122
=== Diagnostics ===
RepRapFirmware for Duet 3 MB6HC version 3.4.1 (2022-06-01 21:09:01) running on Duet 3 MB6HC v1.01 or later (SBC mode)
Board ID: 08DJM-9P63L-DJ3S0-7JKF0-3S86T-TAJR8
Used output buffers: 1 of 40 (12 max)
=== RTOS ===
Static ram: 151000
Dynamic ram: 64296 of which 96 recycled
Never used RAM 135280, free system stack 216 words
Tasks: SBC(resourceWait:,0.5%,484) HEAT(notifyWait,0.0%,321) Move(notifyWait,0.0%,352) CanReceiv(notifyWait,0.0%,944) CanSender(notifyWait,0.0%,374) CanClock(delaying,0.0%,333) TMC(notifyWait,7.7%,92) MAIN(running,91.1%,1231) IDLE(ready,0.6%,30), total 100.0%
Owned mutexes: HTTP(MAIN)
=== Platform ===
Last reset 00:03:01 ago, cause: software
Last software reset at 2022-06-28 12:49, reason: User, GCodes spinning, available RAM 135280, slot 1
Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x00400000 BFAR 0x00000000 SP 0x00000000 Task SBC Freestk 0 n/a
Error status: 0x00
Aux0 errors 0,0,0
Step timer max interval 135
MCU temperature: min 34.9, current 35.2, max 35.6
Supply voltage: min 23.9, current 24.0, max 24.0, under voltage events: 0, over voltage events: 0, power good: yes
12V rail voltage: min 12.2, current 12.2, max 12.3, under voltage events: 0
Heap OK, handles allocated/used 0/0, heap memory allocated/used/recyclable 0/0/0, gc cycles 0
Events: 0 queued, 0 completed
Driver 0: standstill, SG min 0, mspos 590, reads 31022, writes 14 timeouts 0
Driver 1: standstill, SG min 0, mspos 706, reads 31022, writes 14 timeouts 0
Driver 2: standstill, SG min 0, mspos 618, reads 31022, writes 14 timeouts 0
Driver 3: standstill, SG min 0, mspos 8, reads 31022, writes 14 timeouts 0
Driver 4: standstill, SG min 0, mspos 8, reads 31025, writes 11 timeouts 0
Driver 5: standstill, SG min 0, mspos 8, reads 31026, writes 11 timeouts 0
Date/time: 2022-06-28 12:52:53
Slowest loop: 1.21ms; fastest: 0.05ms
=== Storage ===
Free file entries: 10
SD card 0 not detected, interface speed: 37.5MBytes/sec
SD card longest read time 0.0ms, write time 0.0ms, max retries 0
=== Move ===
DMs created 125, segments created 0, maxWait 0ms, bed compensation in use: none, comp offset 0.000
=== MainDDARing ===
Scheduled moves 0, completed 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== AuxDDARing ===
Scheduled moves 0, completed 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== Heat ===
Bed heaters 0 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1, chamber heaters -1 -1 -1 -1, ordering errs 0
=== GCodes ===
Segments left: 0
Movement lock held by null
HTTP* is doing "M122" in state(s) 0
Telnet is idle in state(s) 0
File is idle in state(s) 0
USB is idle in state(s) 0
Aux is idle in state(s) 0
Trigger* is idle in state(s) 0
Queue is idle in state(s) 0
LCD is idle in state(s) 0
SBC is idle in state(s) 0
Daemon is idle in state(s) 0
Aux2 is idle in state(s) 0
Autopause is idle in state(s) 0
Code queue is empty
=== CAN ===
Messages queued 1625, received 0, lost 0, boc 0
Longest wait 0ms for reply type 0, peak Tx sync delay 0, free buffers 50 (min 50), ts 908/0/0
Tx timeouts 0,0,907,0,0,716 last cancelled message type 4514 dest 127
=== SBC interface ===
Transfer state: 5, failed transfers: 0, checksum errors: 0
RX/TX seq numbers: 7681/7681
SPI underruns 0, overruns 0
State: 5, disconnects: 0, timeouts: 0 total, 0 by SBC, IAP RAM available 0x2b880
Buffer RX/TX: 0/0-0, open files: 0
=== Duet Control Server ===
Duet Control Server v3.4.1
Code buffer space: 4096
Configured SPI speed: 8000000Hz, TfrRdy pin glitches: 0
Full transfers per second: 42.61, max time between full transfers: 63.6ms, max pin wait times: 53.6ms/32.5ms
Codes per second: 0.34
Maximum length of RX/TX data transfers: 3084/968

jay_s_uk

@velvia said in Non-PWM hotend fan always on with thermostatic control:

M106 P0 S0 H1 T60 ; set fan 0 value. Thermostatic control is turned on

change this line to

M106 P0 S1 H1 T60                                  ; set fan 0 value. Thermostatic control is turned on

droftarts

@jay_s_uk I'm not sure the fan speed (S parameter) is very relevant when setting thermostatic control. You can leave it out, and the fan will be off when below the set temperature, and on at 100% when above that temperature (just tested). So setting initially off (S0), or on (S1), doesn't make a difference (also just tested).

@Velvia More likely, I think, is that you have connected the fan -negative wire to GND, rather than the out5 pin. Fans are switched on the ground/negative side, by the out5 pin. Positive voltage supply is via the VOUTLC1 pin, which is 'always on', and not switched.

Ian

Velvia

@jay_s_uk
Nothing happened

Velvia

@droftarts
This is most likely the issue. Will try this.

Velvia

@droftarts
It worked! Thank you!