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Heater decoupled notification

TheJoshWTheJoshW
in Repetier-Firmware
Hi,
I am using:
  • Repetier Firmware 1.0.3dev
  • Repetier Server Pro 0.91.2
  • Printer CR-10S with E3D Titan Aero
After a few hours of printing I get a heater decoupled notification and the printer stops.
Is there a way to find out (logs etc):
  • How long it was printing before the message appeared?
  • If it was the bed or hotend that decoupled (I think hotend as Repetier Server shows hotend as DEC). I have the ext temp sensor set to ATC Semitic 104GT-2 as required.
  • What temperature was commanded and what actual temperature was?
  • Any other useful information like if the temperature should have been rising and it wasn’t or vice versa.
  • If I can restart the print from where it stopped.
Thanks for any help.

Comments

  • RepetierRepetier
    DEC is shown for decoupled heater so it is the hotend. You need to enable logging is server to be able to go back to any point of print and see what happened.

    Don't think you can recover that print. Only 0.92.x have a recover feature and that only works on disconnects and power loss. I think a decoupled will continue.

    Check if there was a temperature dropdown - normally the problem mid print. Might happen when the fan got enabled. If it hits the hot part it can cause a sudden temperature drop. In that case you need to increase temperature variance > drop to prevent decoupled or prevent fan from cooling heater.
  • TheJoshWTheJoshW
    Thanks,
    I turned on logging and got (filtered on Temp):
    >  8:04:41.959: T:232.81 /233 B:100.00 /100 B@:148 @:0
    >  8:04:43.077: T:233.44 /233 B:100.03 /100 B@:150 @:230
    >  8:04:44.176: T:233.44 /233 B:100.00 /100 B@:135 @:0
    >  8:04:45.262: T:234.69 /233 B:100.00 /100 B@:154 @:0 <--- TEMP DROPPING FROM HERE
    >  8:04:46.366: T:234.38 /233 B:100.00 /100 B@:141 @:0
    >  8:04:47.451: T:233.44 /233 B:100.00 /100 B@:153 @:230
    >  8:04:48.554: T:233.44 /233 B:100.00 /100 B@:140 @:0
    >  8:04:49.658: T:232.50 /233 B:99.97 /100 B@:145 @:230
    >  8:04:50.744: T:232.19 /233 B:100.00 /100 B@:152 @:230
    >  8:04:51.847: T:231.56 /233 B:100.00 /100 B@:146 @:230
    >  8:04:52.950: T:231.25 /233 B:100.00 /100 B@:145 @:230
    >  8:04:54.052: T:230.63 /233 B:100.00 /100 B@:145 @:230
    >  8:04:55.139: T:228.75 /233 B:99.97 /100 B@:149 @:230
    >  8:04:56.242: T:228.00 /233 B:100.00 /100 B@:138 @:230
    >  8:04:57.345: T:227.50 /233 B:100.00 /100 B@:144 @:230
    >  8:04:58.447: T:227.25 /233 B:100.00 /100 B@:137 @:230
    >  8:04:59.534: T:226.50 /233 B:100.00 /100 B@:143 @:230
    >  8:05:00.637: T:225.25 /233 B:100.03 /100 B@:138 @:230
    >  8:05:01.739: T:224.00 /233 B:100.03 /100 B@:144 @:230
    >  8:05:02.826: T:223.25 /233 B:100.00 /100 B@:129 @:230
    >  8:05:03.928: T:222.50 /233 B:100.00 /100 B@:147 @:230
    >  8:05:05.030: T:221.00 /233 B:100.00 /100 B@:140 @:230
    >  8:05:06.134: T:220.25 /233 B:100.00 /100 B@:139 @:230
    >  8:05:07.220: T:219.36 /233 B:100.03 /100 B@:134 @:230
    >  8:05:08.322: T:218.72 /233 B:100.00 /100 B@:144 @:230
    >  8:05:09.426: T:217.23 /233 B:100.00 /100 B@:131 @:230
    >  8:05:10.512: T:216.38 /233 B:100.03 /100 B@:132 @:230
    >  8:05:11.614: T:215.74 /233 B:100.03 /100 B@:132 @:230
    >  8:05:12.718: T:215.11 /233 B:100.03 /100 B@:131 @:230
    >  8:05:13.820: T:213.19 /233 B:100.00 /100 B@:135 @:230
    >  8:05:14.907: T:212.98 /233 B:100.03 /100 B@:130 @:255
    >  8:05:16.010: T:212.34 /233 B:100.03 /100 B@:129 @:255
    >  8:05:17.113: T:211.70 /233 B:100.03 /100 B@:135 @:255
    >  8:05:18.200: T:210.43 /233 B:100.03 /100 B@:122 @:255
    >  8:05:19.304: T:209.32 /233 B:100.00 /100 B@:132 @:255
    >  8:05:20.406: T:208.98 /233 B:100.03 /100 B@:127 @:255
    >  8:05:21.508: T:207.97 /233 B:100.03 /100 B@:126 @:255
    >  8:05:22.598: T:206.95 /233 B:100.03 /100 B@:126 @:255
    >  8:05:23.698: T:206.61 /233 B:100.03 /100 B@:119 @:255
    >  8:05:24.802: T:205.93 /233 B:100.03 /100 B@:130 @:255
    >  8:05:25.888: T:204.75 /233 B:100.03 /100 B@:123 @:255
    >  8:05:26.990: T:203.90 /233 B:100.00 /100 B@:128 @:255
    >  8:05:29.112: T:-444.00 /0 B:100.03 /0 B@:0 @:0 D0:2
    >  8:05:29.181: T:-444.00 /0 B:99.97 /0 B@:0 @:0 D0:2
    >  8:05:30.285: T:-444.00 /0 B:99.86 /0 B@:0 @:0 D0:2
    >  8:05:31.387: T:-444.00 /0 B:99.83 /0 B@:0 @:0 D0:2
    >  8:05:32.490: T:-444.00 /0 B:99.73 /0 B@:0 @:0 D0:2
    >  8:05:33.575: T:-444.00 /0 B:99.69 /0 B@:0 @:0 D0:2
    >  8:05:34.679: T:-444.00 /0 B:99.62 /0 B@:0 @:0 D0:2
    >  8:05:35.782: T:-444.00 /0 B:99.49 /0 B@:0 @:0 D0:2
    >  8:05:36.272: T:-444.00 /0 B:99.45 /0 B@:0 @:0 D0:2
    >  8:05:27.374: Error:One heater seems decoupled from thermistor - disabling all for safety!
    >  8:05:27.374: Error:Temp. raised to slow. Rise = -9.25 after 13079 ms
    >  8:05:27.375: Disabling all heaters due to detected sensor defect.
    >  8:05:27.375: DebugLevel:14
    >  8:05:29.111: RequestStop:
    >  8:05:36.273: fatal:Heater/sensor error - Printer stopped and heaters disabled due to this error. Fix error and restart with M999.

    So it looks like the temp sensor (thermistor) is ok because its still showing a valid looking temperature, and the hotend heater is not working as the temperature is dropping even though its being commanded to heat.
  • RAyWBRAyWB
    no, seems like sensor is defect :

    >  8:05:26.990: T:203.90 /233 B:100.00 /100 B@:128 @:255
    >  8:05:29.112: T:-444.00 /0 B:100.03 /0 B@:0 @:0 D0:2

    watch T  : 8:05:29.112: T:-444.00  

    should show a valid temperature


  • TheJoshWTheJoshW
    Sorry I filtered out some lines and forgot to put them in.  At the point where it transitions to T:-444.0 the log contained the following lines:
    ...
    >  8:05:24.802: T:205.93 /233 B:100.03 /100 B@:130 @:255
    >  8:05:25.888: T:204.75 /233 B:100.03 /100 B@:123 @:255
    >  8:05:26.990: T:203.90 /233 B:100.00 /100 B@:128 @:255
    >  8:05:27.374: Error:One heater seems decoupled from thermistor - disabling all for safety!
    >  8:05:27.374: Error:Temp. raised to slow. Rise = -9.25 after 13079 ms
    >  8:05:27.375: Disabling all heaters due to detected sensor defect.
    >  8:05:27.375: DebugLevel:14
    >  8:05:29.111: RequestStop:
    >  8:05:29.112: T:-444.00 /0 B:100.03 /0 B@:0 @:0 D0:2
    >  8:05:29.181: T:-444.00 /0 B:99.97 /0 B@:0 @:0 D0:2
    >  8:05:30.285: T:-444.00 /0 B:99.86 /0 B@:0 @:0 D0:2
    ...
    Hmm, but you are correct, it does say its a sensor defect.  Hopefully @Repetier can confirm if its the sensor or the heater.

  • RepetierRepetier
    -444 is a magic number to mark temperature as decoupled, so that does not come from temperature reading and I think reading sensor is correct. More of interest is this

    8:05:21.508: T:207.97 /233 B:100.03 /100 B@:126 @:255
    >  8:05:22.598: T:206.95 /233 B:100.03 /100 B@:126 @:255
    >  8:05:23.698: T:206.61 /233 B:100.03 /100 B@:119 @:255
    >  8:05:24.802: T:205.93 /233 B:100.03 /100 B@:130 @:255
    >  8:05:25.888: T:204.75 /233 B:100.03 /100 B@:123 @:255
    >  8:05:26.990: T:203.90 /233 B:100.00 /100 B@:128 @:255
    >  8:05:29.112: T:-444.00 /0 B:100.03 /0 B@:0 @:0 D0:2
    >  8:05:29.181: T:-444.00 /0 B:99.97 /0 B@:0 @:0 D0:2
    >  8:05:30.285: T:-444.00 /0 B:99.86 /0 B@:0 @:0 D0:2

    You see heater is set on full power but temperature is going down until you reach the decouple treshold and it gets marked decoupled (-444). So problem is heater related. Broken cable, defect heater block, defect FET on printer board, fuse, .. something like that. Measure voltage at output when it starts to happen and see if you have your voltage or not. Then you know on which side the error happens. Just need to be quickly. Once decouple is triggered voltage goes to 0 in any case.
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