1LC Multiple Disconnects

[curieos]

@Phaedrux Yes, all of the 24V system is connected to one supply.

[curieos]

@dc42 I'm reporting in that this issue is still occurring. I have changed out the CAN data and power cable runs to this toolhead yet again, in fact the run is a little different this time. The tool distribution board is now mounted to the gantry, so the power and data cables are shorter than before.

The same toolboard locks up at around the same point in any print I've tried, typically around the 1 hour mark. It's been replaced once already. The board does not recover until a full power cycle of the machine is performed.

I have an M122 output from this latest event:

=== Diagnostics ===
RepRapFirmware for Duet 3 MB6XD version 3.5.0-rc.3 (2024-01-24 17:59:29) running on Duet 3 MB6XD v1.01 or later (SBC mode)
Board ID: 0JD2M-999AL-D25SW-6JKD0-3S06R-95ZB1
Used output buffers: 1 of 40 (40 max)
=== RTOS ===
Static ram: 153600
Dynamic ram: 92392 of which 0 recycled
Never used RAM 96400, free system stack 122 words
Tasks: SBC(2,ready,14.4%,407) HEAT(3,nWait 6,0.2%,322) Move(4,nWait 6,8.7%,213) CanReceiv(6,nWait 1,28.2%,770) CanSender(5,nWait 7,0.1%,325) CanClock(7,delaying,0.1%,346) MAIN(2,running,47.7%,444) IDLE(0,ready,0.6%,30), total 100.0%
Owned mutexes: HTTP(MAIN)
=== Platform ===
Last reset 03:30:24 ago, cause: power up
Last software reset at 2024-03-07 09:55, reason: User, Gcodes spinning, available RAM 95784, slot 0
Software reset code 0x6003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x00400000 BFAR 0x00000000 SP 0x00000000 Task SBC Freestk 0 n/a
Error status: 0x04
Aux0 errors 0,0,0
MCU temperature: min 30.9, current 48.1, max 49.9
Supply voltage: min 25.8, current 26.0, max 26.1, under voltage events: 0, over voltage events: 0, power good: yes
12V rail voltage: min 12.1, current 12.1, max 12.2, under voltage events: 0
Heap OK, handles allocated/used 99/38, heap memory allocated/used/recyclable 2048/1388/712, gc cycles 4
Events: 3 queued, 3 completed
Driver 0: ok
Driver 1: ok
Driver 2: ok
Driver 3: ok
Driver 4: ok
Driver 5: ok
Date/time: 2024-03-14 14:58:02
Slowest loop: 1000.79ms; fastest: 0.05ms
=== Storage ===
Free file entries: 20
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 31, maxWait 3494446ms, bed compensation in use: none, height map offset 0.000, max steps late 1, ebfmin 0.00, ebfmax 0.00
no step interrupt scheduled
Moves shaped first try 9729, on retry 4260, too short 16445, wrong shape 17913, maybepossible 1481
=== DDARing 0 ===
Scheduled moves 59311, completed 59311, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 4], CDDA state -1
=== DDARing 1 ===
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 ===
Movement locks held by null, 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
File2* is idle in state(s) 0
Queue2 is idle in state(s) 0
Q0 segments left 0, axes/extruders owned 0x0000000
Code queue 0 is empty
Q1 segments left 0, axes/extruders owned 0x0000000
Code queue 1 is empty
=== Filament sensors ===
check 0 clear 0
Extruder 0: no data received, errs: frame 0 parity 0 ovrun 0 pol 0 ovdue 0
Extruder 1: no data received, errs: frame 0 parity 0 ovrun 0 pol 0 ovdue 0
=== CAN ===
Messages queued 189586, received 21212642, lost 0, errs 586337, boc 48
Longest wait 208ms for reply type 6033, peak Tx sync delay 1409, free buffers 50 (min 47), ts 63121/63096/0
Tx timeouts 0,0,0,0,0,0
=== SBC interface ===
Transfer state: 5, failed transfers: 0, checksum errors: 0
RX/TX seq numbers: 57670/57670
SPI underruns 0, overruns 0
State: 5, disconnects: 0, timeouts: 0 total, 0 by SBC, IAP RAM available 0x2600c
Buffer RX/TX: 0/0-0, open files: 0
=== Duet Control Server ===
Duet Control Server version 3.5.0-rc.3 (2024-01-26 12:34:19)
File+ProcessInternally:
> Busy
Failed to deserialize the following properties:
- Board -> BoardState from "timedOut"
Code buffer space: 4096
Configured SPI speed: 8000000Hz, TfrRdy pin glitches: 1
Full transfers per second: 39.34, max time between full transfers: 73.4ms, max pin wait times: 69.8ms/18.6ms
Codes per second: 13.12
Maximum length of RX/TX data transfers: 5088/3144

I'm going to try disconnecting all connections to the board except for the endstop required for homing, and then I'll run another print. Let me know if there's any additional steps I should try.

edit: Here's the M122 for the board that locked up after a restart

Diagnostics for board 21:
Duet TOOL1LC rev 1.1 or later firmware version 3.5.0-rc.3 (2024-01-24 17:55:14)
Bootloader ID: SAMC21 bootloader version 2.8 (2023-07-25)
All averaging filters OK
Never used RAM 2936, free system stack 104 words
Tasks: Move(3,nWait 7,0.0%,135) HEAT(2,nWait 6,0.2%,127) CanAsync(5,nWait 4,0.0%,51) CanRecv(3,nWait 1,0.0%,71) CanClock(5,nWait 1,0.0%,59) ACCEL(3,nWait 6,0.0%,53) TMC(2,delaying,3.4%,53) MAIN(1,running,91.7%,315) IDLE(0,ready,0.0%,27) AIN(2,delaying,4.6%,112), total 100.0%
Owned mutexes:
Last reset 00:02:17 ago, cause: power up
Last software reset at 2024-02-01 11:32, reason: HardFault, available RAM 2016, slot 0
Software reset code 0x0060 ICSR 0x00000003 SP 0x20002f08 Task MAIN Freestk 813 ok
Stack: 200048c8 00000000 00000001 4aa36799 00000000 0000f3cb 4aa36798 21000000 20001488 0000f00d a5a5a5a5 0080bdc1 00000089 000001f4 20001ce0 0001285f 00000000 00000000 20004370 a5a5a5a5 a5a5a5a5 a5a5a5a5 a5a5a5a5 a5a5a5a5 a5a5a5a5 a5a5a5a5 a5a5a5a5
Driver 0: pos 0, 404.8 steps/mm, standstill, SG min 0, read errors 0, write errors 0, ifcnt 12, reads 2957, writes 12, timeouts 0, DMA errors 0, CC errors 0, steps req 0 done 0
Moves scheduled 0, completed 0, in progress 0, hiccups 0, segs 0, step errors 0, maxLate 0 maxPrep 0, maxOverdue 0, maxInc 0, mcErrs 0, gcmErrs 0, ebfmin 0.00 max 0.00
Peak sync jitter 0/4, peak Rx sync delay 207, resyncs 0/0, no timer interrupt scheduled
VIN voltage: min 26.7, current 26.8, max 26.8
MCU temperature: min 34.8C, current 41.4C, max 41.4C
Last sensors broadcast 0x00018004 found 3 35 ticks ago, 0 ordering errs, loop time 0
CAN messages queued 2530, send timeouts 0, received 2038, lost 0, errs 0, boc 0, free buffers 18, min 18, error reg 0
dup 0, oos 0/0/0/0, bm 0, wbm 0, rxMotionDelay 0
Accelerometer: LIS3DH, status: 00
I2C bus errors 0, naks 3, contentions 0, other errors 0
=== Filament sensors ===
Interrupt 5726621 to 0us, poll 6 to 542us
Driver 0: no data received, errs: frame 0 parity 0 ovrun 0 pol 0 ovdue 0

[dc42]

@curieos said in 1LC Multiple Disconnects:

The only things that changed between the toolboard working fine and it having issues were a grounding wire run to the toolhead plate, and a new CAN cable with crimped terminations instead of the soldered pigtails.

What is the grounding wire connected to? If it's connected to mains ground, is Duet ground also connected to mains ground?

Is the extruder motor body also grounded?

[curieos]

@dc42 The grounding wire is connected to earth ground, and it screws into an aluminum toolhead plate. The grounding wire connected to the 1LC via one of the mounting holes is also connected to the toolhead plate. I can see if there's a low impedance connection between DC ground and earth ground when I get into work today, I assume this would be an issue.

The extruder motor body is physically touching said toolhead plate, and the mounting screws go through the toolhead plate. The toolhead plate is anodized, so it's not the most solid connection, but I've checked with a multimeter and there is continuity. The extruder is an LGX Pro, so the hotend mount is made of anodized aluminum, and the hotend metalwork is connected to the toolhead plate through the extruder mounting. I've checked with a multimeter and it detects continuity. If this isn't good enough I can run a discrete grounding wire from the toolhead plate to the coldside of the hotend.

[curieos]

@dc42 I may have fixed it.

Turns out on this unit, there was a zero impedance connection between DC ground and Earth ground. I found the culprit, the cutout for the ethernet extension plugged into the pi was made upside down. This meant the shielding on the plug was in contact with the aluminum frame panel. The panel is powder coated, but it appears the coating wore away in this area. I flipped it upside down and now the grounds aren't shorted.

I ran a 6 hour print last night and there were no issues. The longest I've seen it go without locking up was 3-4 hours, so I think this means the problem is solved. I'm running a slightly longer print (22.5 hours) now, so that will definitely be definitive.

[dc42]

@curieos I'm glad you appear to have found the cause! Ground loops can cause various odd behaviour, just like ESD can.

I'll mark this thread as solved but feel free to revert it if the problem recurs.