error "warning: 12V under-voltage event (9.5V)"

R006

warning: 12V under-voltage event (9.5V)

warning: 12V under-voltage event (8.7V)

When I am printing anything I found 12V under-voltage event (9.5V) or (8.7V) randomly.
Error comes up after 12Hour printing or sometimes after 6 hours of printing.
This error comes up every time while printing any objects.
Due to under voltage event my extruder got hit badly with print and got hotend damaged.
If I left machine ON with extruder heater and bed heater ON, then I didn't get any error.

I am using Duet Main Board 6HC with 24V Meanwell SMPS and it's output is 24V I have verified.
Changed my extruder heater.
Checked all wiring and no lose connection.

Can you please give me advice how can I find root cause for this under voltage event?

Please see below Log file:
power up + 00:00:02 [info] Event logging started at level debug
power up + 00:00:02 [info] Running: Duet 3 MB6HC v1.01 or later: 3.4.0beta3 (2022-03-03 11:02:18)
power up + 00:00:02 [info] STPL-INFD600d - Print your imagination!
power up + 00:00:02 [debug] Done!
power up + 00:00:02 [debug] RepRapFirmware for Duet 3 MB6HC MOD. By STPL is up and running.
power up + 00:01:22 [info] Event logging stopped
power up + 00:00:02 [info] Event logging started at level debug
power up + 00:00:02 [info] Running: Duet 3 MB6HC v1.01 or later: 3.4.0beta3 (2022-03-03 11:02:18)
power up + 00:00:02 [info] STPL-INFD600d - Print your imagination!
power up + 00:00:02 [debug] Done!
power up + 00:00:02 [debug] RepRapFirmware for Duet 3 MB6HC MOD. By STPL is up and running.
power up + 00:00:15 [info] G10 P1 S0 R0
power up + 00:00:15 [info] G10 P0 S210 R210
power up + 00:01:39 [debug] Leadscrew adjusted
power up + 00:02:00 [debug] T:211.0 /210.0 T0:211.0 /210.0 T1:40.4 /0.0 B:54.9 /55.0
power up + 00:02:01 [debug] {"beep_freq":600,"beep_length":100}
power up + 00:02:01 [debug] {"beep_freq":700,"beep_length":1200}
power up + 00:02:01 [debug] {"beep_freq":500,"beep_length":300}
power up + 00:02:01 [info] G10 L2 P1 X0.00 Y0.00 Z0.00
power up + 00:02:01 [info] G10 L2 P2 X0.00 Y0.00 Z0.00
power up + 00:02:01 [info] G10 L2 P3 X0.00 Y0.00 Z0.00
power up + 00:02:01 [info] G10 L2 P4 X0.00 Y0.00 Z0.00
power up + 00:02:01 [info] G10 L2 P5 X0.00 Y0.00 Z0.00
power up + 00:02:01 [info] G10 L2 P6 X0.00 Y0.00 Z0.00
power up + 00:02:01 [info] G10 L2 P7 X0.00 Y0.00 Z0.00
power up + 00:02:01 [info] G10 L2 P8 X0.00 Y0.00 Z0.00
power up + 00:02:01 [info] G10 L2 P9 X0.00 Y0.00 Z0.00
power up + 00:02:02 [debug] File 0:/gcodes/PRAGATI/BOX1-11-03-2024(1Day9hrs11mins)386g.gcode selected for printing
power up + 00:02:31 [warn] Started printing file 0:/gcodes/PRAGATI/BOX1-11-03-2024(1Day9hrs11mins)386g.gcode
power up + 00:02:34 [warn] Error: Attempting to extrude with no tool selected.
power up + 00:02:38 [warn] Error: Attempting to extrude with no tool selected.
power up + 00:02:39 [info] G10 P1 S0 R0
power up + 00:02:39 [info] G10 P0 S210 R210
power up + 00:04:03 [debug] Leadscrew adjusted
power up + 00:04:48 [debug] {"beep_freq":600,"beep_length":100}
power up + 00:04:48 [debug] {"beep_freq":700,"beep_length":1200}
power up + 00:04:50 [debug] {"beep_freq":500,"beep_length":300}
power up + 00:04:50 [warn] Error: Attempting to extrude with no tool selected.
power up + 00:04:52 [info] G10 L2 P1 X0.00 Y0.00 Z0.00
power up + 00:04:54 [warn] Error: Attempting to extrude with no tool selected.
power up + 00:04:55 [info] G10 L2 P2 X0.00 Y0.00 Z0.00
power up + 00:04:55 [info] G10 L2 P3 X0.00 Y0.00 Z0.00
power up + 00:04:57 [info] G10 L2 P4 X0.00 Y0.00 Z0.00
power up + 00:04:57 [info] G10 L2 P5 X0.00 Y0.00 Z0.00
power up + 00:04:59 [info] G10 L2 P6 X0.00 Y0.00 Z0.00
power up + 00:05:00 [info] G10 L2 P7 X0.00 Y0.00 Z0.00
power up + 00:05:00 [warn] Resume state saved
power up + 00:05:00 [warn] Print auto-paused due to low voltage
power up + 00:05:00 [warn] Warning: 12V under-voltage event (9.5V)
power up + 00:00:02 [info] Event logging started at level debug
power up + 00:00:02 [info] Running: Duet 3 MB6HC v1.01 or later: 3.4.0beta3 (2022-03-03 11:02:18)
power up + 00:00:02 [info] STPL-INFD600d - Print your imagination!
power up + 00:00:02 [debug] Done!
power up + 00:00:02 [debug] RepRapFirmware for Duet 3 MB6HC MOD. By STPL is up and running.
power up + 00:00:38 [debug] {"err":-1}

power up + 00:00:38 [debug] {"err":-1}

power up + 00:00:39 [debug] {"err":-1}

@dc42 @Phaedrux @T3P3Tony Is there any way to troubleshoot this problem?

gloomyandy

@R006 What are you powering with 12V if anything?

R006

@gloomyandy Part cooling Fan power up with 12V and Pin No - OUT_7

gloomyandy

@R006 I'd be checking the wiring that goes to that fan. Try unplugging the part cooling fan at the Duet board and then running a print (with no filament perhaps to save waste) and see if you get the low voltage warning then. If you don't it is almost certainly a problem with that fan/wiring.

R006

@gloomyandy @dc42
This is issue is very random, it occurred after 18 hours of print.
Can you please tell me how do I confirm that 12V rail is correct or damaged?
Please check diagnose command data below, there is no under voltage event.

power up + 00:00:18 [debug] Aux(MAIN)
power up + 00:00:18 [debug] === Platform ===
power up + 00:00:18 [debug] Last reset 00:00:18 ago, cause: power up
power up + 00:00:18 [debug] Last software reset at 2024-03-16 13:52, reason: HardFault undefInstr, none spinning, available RAM 105108, slot 0
power up + 00:00:18 [debug] Software reset code 0x4072 HFSR 0x40000000 CFSR 0x00010000 ICSR 0x00400803 BFAR 0x00000000 SP 0x2041fc18 Task NEUW Freestk 4290773517 ok
power up + 00:00:18 [debug] Stack: 00000001 0000002e 2041fca8 00000006 ffffffff 0047dbd3 0047dbd2 21070000 2041fcb4 2041fcb4 00000000 00000031 2041fcb4 2041fcec 00000000 0049d7a0 00020021 0047d867 2041b5c0 0041788f 00000000 00313631 2041f024 0049d734 2041fcb4 0049d734 00000000
power up + 00:00:18 [debug] Error status: 0x00
power up + 00:00:18 [debug] Aux0 errors 0,0,0
power up + 00:00:18 [debug] Step timer max interval 125
power up + 00:00:18 [debug] MCU temperature: min 40.5, current 48.4, max 48.4
power up + 00:00:18 [debug] Supply voltage: min 24.0, current 24.1, max 24.2, under voltage events: 0, over voltage events: 0, power good: yes
power up + 00:00:18 [debug] 12V rail voltage: min 11.9, current 12.0, max 12.1, under voltage events: 0
power up + 00:00:18 [debug] Heap OK, handles allocated/used 0/0, heap memory allocated/used/recyclable 0/0/0, gc cycles 0
power up + 00:00:18 [debug] Driver 0: position 0, standstill, reads 36404, writes 17 timeouts 0, SG min/max 0/0
power up + 00:00:18 [debug] Driver 1: position 0, standstill, reads 36409, writes 17 timeouts 0, SG min/max 0/0
power up + 00:00:18 [debug] Driver 2: position 0, standstill, reads 36410, writes 17 timeouts 0, SG min/max 0/0
power up + 00:00:18 [debug] Driver 3: position 0, standstill, reads 36410, writes 17 timeouts 0, SG min/max 0/0
power up + 00:00:18 [debug] Driver 4: position 0, standstill, reads 36411, writes 17 timeouts 0, SG min/max 0/0
power up + 00:00:18 [debug] Driver 5: position 0, standstill, reads 36427, writes 17 timeouts 0, SG min/max 0/0
power up + 00:00:18 [debug] Date/time:
power up + 00:00:18 [debug] 1970-01-01 00:00:00
power up + 00:00:18 [debug] Slowest loop: 5.43ms; fastest: 0.05ms

gloomyandy

@R006 There is no magic way to diagnose this sort of problem. You have already tried just leaving the machine with the heaters on and when you did that you did not have an error. You could I suppose try leaving the printer running with the part cooling fan running (but no print in progress) to see if you get any sort of error then. If that does not show a problem then it is likely that something (like the movement of the connected cables) is causing a problem during printing. The test I suggested above will help identify if it is a problem with the fan/wiring that you have connected to the 12v supply.