No dc voltage to the hot end blocks



  • Firmware Name: RepRapFirmware for Duet 2 WiFi/Ethernet
    Firmware Electronics: Duet WiFi 1.02 or later
    Firmware Version: 2.01beta2(RTOS) (2018-07-14b5)
    WiFi Server Version: 1.21
    Web Interface Version: 1.21.2-dc42

    Had the Nozzle heater working last Friday, now I am not heating up. Put 12 V-DC to the Heater Cartridge and it heats up over 100 C. Put Voltmeter on the heater blocks with heater turned on and get 0 DC voltage (maybe don't know what voltage to be looking for?) both heat bed connectors with correct wiring. ![alt text]0_1534196930615_Heater error 8-13-18.jpg Termosistor is wired, yet is not responding to actual nozzle heat?
    Remember reading on here were dc42 had suggested to move themosistor to another pinout? Did not mark for further reference!
    Any suggestions?0_1534197553417_Heater error 8-13-18.jpg


  • administrators

    Looks like you have a bad connection in the thermistor wiring, because it gave you the "thermistor is open circuit" error message and put heater 0 in the Fault state.



  • Thank You dc42, I did this for resistance at the blocks, themosistors are brand new and by applying forced air on the bulbs I get a temperatur rise.
    0_1534263680012_Bed & Nozzle errors 8-14.jpg
    Test with a S1141 car light bulb @18.4 watts used to load the:

    1. Hot bed no light – M140 S60
    2. E0 extruder no light – G10 POS215
    3. E1 extruder no light. - G10 POS215
      Apparently I don't know why this is happening.


  • Your heated bed is working fine, check the first post where it is showing 61.2C.

    You'll need valid thermistor readings before the board will let you heat the associated hotend. This is for safety reasons.



  • @elmoret Thank You not very savy with all this interlocking functions. Gratefull you gents have better understanding of the workings. Rather frustrated with this adventure, long gone is the fun of printing.


  • administrators

    The key is the status shown in the Heater column. If it shows "Fault" then the firmware will refuse to operate the heater until the fault is reset by sending M562. Your original post shows the temperature of heater 0 (blue in the chart) going off scale, which will put heater 0 in the Fault state.



  • Have tried all suggestions and read this "Tuning the heater temperature control" I have a brand new out of the package thermistor and 12 V D heat core, they are wired directly to the appropriate blocks and still get Faults. I believe this board is one in a thousand fail.0_1534294810127_Heater error 8-14-18.jpg Here are some shots of what is going on. I removed the avaiation plug and used a connector strip to the Hot end assembly. Have contacted the retailer and they are watching this post for a clue of what is not working!



  • @ngwpower said in No dc voltage to the hot end blocks:

    I have a brand new out of the package thermistor and 12 V D heat core, they are wired directly to the appropriate blocks

    Can you post some clear, well lit photos of this, please? Now your screenshots aren't showing any temperatures at all, whereas previously they were showing correct temperatures. This leads me to believe the board is not to blame here, since the board hasn't changed (but the wiring has).


  • administrators

    @ngwpower said in No dc voltage to the hot end blocks:

    Have tried all suggestions and read this "Tuning the heater temperature control" I have a brand new out of the package thermistor and 12 V D heat core, they are wired directly to the appropriate blocks and still get Faults. I believe this board is one in a thousand fail.0_1534294810127_Heater error 8-14-18.jpg Here are some shots of what is going on. I removed the avaiation plug and used a connector strip to the Hot end assembly. Have contacted the retailer and they are watching this post for a clue of what is not working!

    Your temperatures are reading 2000C. You won't be able to operate or tune the heaters until you fix that. The tuning error message is telling you that the temperature sensor is not connected.

    BTW you appear to be using heater 0 for the extruder and heater 1 for the bed. That is the opposite way round from usual. Is there a reason why you chose that?



  • This post is deleted!


  • @elmoret I posted this earlier. " I have a brand new out of the package thermistor and 12 V DC heat core, they are wired directly to the appropriate blocks and still get Faults. Why is this not enough. I know you are attempting to help, just not sure about how!



  • @dc42 "you appear to be using heater 0 for the extruder and heater 1 for the bed." The instructions on RepRapFirmware Configuration Tool is rather confusing for me. Never been to college for this type of engineering. I just guessed at the choices.
    I apparently checked the box for "Assign bed heater to first nozzle". Maybe why its like this.


  • administrators

    @ngwpower said in No dc voltage to the hot end blocks:

    I apparently checked the box for "Assign bed heater to first nozzle". Maybe why its like this.

    Yes, that would explain it. I suggest you generate a new config.g file with that not checked.



  • @dc42 I have done it and loaded the Zip file. Applied and reconnected to the eb Control - still get a fault heater 1. Darn it. Not an engineer, could the blocks be a cold solder to the board? Have seen this with other boards that were bad.



  • Went to the RepRapFirmware Configuration Tool site and tried riprapfirmware. Still gettings faults in heater 1. Maybe I should return this part of just junk it. Not worth the time I have spent on it.



  • Can you post your config.g? and can you describe how you have things wired?


  • administrators

    @ngwpower said in No dc voltage to the hot end blocks:

    @dc42 I have done it and loaded the Zip file. Applied and reconnected to the eb Control - still get a fault heater 1. Darn it. Not an engineer, could the blocks be a cold solder to the board? Have seen this with other boards that were bad.

    Are you getting a sensible temperature reading on heater 1 now?



  • @dc42 No nothing has changed on heater faults, I hooked up the Keenovo pad with a module, seperated power source. It also is giving me Faults. 0_1534369323519_8-15 Faults on screen.jpg



  • @phaedrux Have a hard time explaining things. I use pictures to guide myself in these situations. Removed the aircraft fitting from the E connections " Thermistor, fans, heater cartridge and placed them on a connector strip. P.S. the heat bed is going to default also.
    Here is the code.
    ; Configuration file for Duet WiFi (firmware version 1.21)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool on Wed Aug 15 2018 13:06:04 GMT-0700 (Pacific Daylight Time)

    ; General preferences
    G90 ; Send absolute coordinates...
    M83 ; ...but relative extruder moves
    M555 P1 ; Set firmware compatibility to look like RepRapFirmare

    ; Network
    M550 PRiprapfirware ; Set machine name
    M552 S1 ; Enable network
    ;*** Access point is configured manually via M587
    M586 P0 S1 ; Enable HTTP
    M586 P1 S0 ; Disable FTP
    M586 P2 S0 ; Disable Telnet

    ; Drives
    M569 P0 S1 ; Drive 0 goes forwards
    M569 P1 S1 ; Drive 1 goes forwards
    M569 P2 S1 ; Drive 2 goes forwards
    M569 P3 S1 ; Drive 3 goes forwards
    M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
    M92 X80 Y80 Z4000 E420 ; Set steps per mm
    M566 X900 Y900 Z12 E120 ; Set maximum instantaneous speed changes (mm/min)
    M203 X6000 Y6000 Z180 E1200 ; Set maximum speeds (mm/min)
    M201 X500 Y20 Z250 E250 ; Set accelerations (mm/s^2)
    M906 X800 Y800 Z800 E800 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    ; Axis Limits
    M208 X0 Y0 Z0 S1 ; Set axis minima
    M208 X300 Y300 Z400 S0 ; Set axis maxima

    ; Endstops
    M574 X1 Y1 S0 ; Set active low endstops

    ; Z-Probe
    M558 P0 H5 F120 T6000 ; Disable Z probe but set dive height, probe speed and travel speed
    M557 X15:285 Y15:285 S20 ; Define mesh grid

    ; Heaters
    M305 P0 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 0
    M143 H0 S120 ; Set temperature limit for heater 0 to 120C
    M305 P1 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 1
    M143 H1 S280 ; Set temperature limit for heater 1 to 280C

    ; Fans
    M106 P0 S1 I1 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P1 S1 I1 F500 H1 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
    M106 P2 S1 I1 F500 H1 T45 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

    ; Tools
    M563 P0 D0 H1 ; 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

    ; Automatic saving after power loss is not enabled

    ; Custom settings are not configured



  • Hi,

    How about photo showing your thermistor connections?

    Frederick


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