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    Hotend pid makes motors pulsate

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    • Phaedruxundefined
      Phaedrux Moderator
      last edited by

      Can you post your config for each printer? What thermistor are you using? What does the temp graph look like while printing? Have you redone the PID tuning?

      Z-Bot CoreXY Build | Thingiverse Profile

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      • dc42undefined
        dc42 administrators
        last edited by

        Are you certain it is the hot end PID that triggers this, not the bed PID? The bed PID would be much more likely to.

        Duet WiFi hardware designer and firmware engineer
        Please do not ask me for Duet support via PM or email, use the forum
        http://www.escher3d.com, https://miscsolutions.wordpress.com

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        • johnjohn1990undefined
          johnjohn1990 @dc42
          last edited by johnjohn1990

          @dc42 said in Hotend pid makes motors pulsate:

          Are you certain it is the hot end PID that triggers this, not the bed PID? The bed PID would be much more likely to.

          it is, absolutely not, a heated bed, cause it does not have any... no need for it, on a pla-only printer 🙂

          @phaedrux said in Hotend pid makes motors pulsate:

          Can you post your config for each printer? What thermistor are you using? What does the temp graph look like while printing? Have you redone the PID tuning?

          configs has nothing to do to with it, but youre welcome to have a copy of it.. but it is not that, since it happend during a print.... only thing that actually made it possible to get rid of the waves, was a brand new board...
          yes ofc i have..... i have done everything and more than imaginable... it doesnt do any difference changing anything to the heatercontrol.... i have changed EVERY PART possible....

          NOTHING could make the waves better or worse - only microstepping and gearing changed the distance between the waves... - which indicates to me that the issue is NOT mechanical.. this is repeatable and redoable on both duets, on both my delta and ultimaker 2,...

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          • johnjohn1990undefined
            johnjohn1990 @Veti
            last edited by

            @veti said in Hotend pid makes motors pulsate:

            @johnjohn1990 said in Hotend pid makes motors pulsate:

            I have just borrowed a brand new board from a buddy, and it doest not have these issues.. also, the MCU temp on this ned board never gets above 29c..... but both of my boards have a working temp of around 44-49c.....

            that is within the range of the deviation.
            see
            https://duet3d.dozuki.com/Wiki/Calibrating_the_CPU_temperature

            could very well be, that it is inside the range... but it used to be colder/have had my duets for 1.5 year-2years).. so it could be a sign, of some internal mishaps, vercurrent, something... but the temp increase happend around the same time as the issues started... i noticed the hotter mcu temp, and noticed that my printer could not keep up with the same speeds on retract(just to take an example), that made my z motor skip or take extra steps.... but i thought it was just due to the higher temps in spring/summer, than in the winter..... but no, as soon as i turn on the board, the temp fly's up to that range, that is not normal...
            i know these packages are made to last pretty high temps, but theory isnt everything..... - your cpu in your pc, can also die due to too high heat, even though youve never hit the max temp..... but i agreee, it should be inside range... but since it happend, out of nowhere, long time ago, i believe it is not normal, in my case... usually, when this happens to bga chips, it is due to power delivery or a short....

            T3P3Tonyundefined 1 Reply Last reply Reply Quote 0
            • johnjohn1990undefined
              johnjohn1990
              last edited by

              heres my um2 config

              ; Configuration file for Duet WiFi (firmware version 1.20 or newer)
              ; executed by the firmware on start-up
              ;
              ; generated by RepRapFirmware Configuration Tool on Thu Mar 22 2018 22:44:44 GMT+0100 (Rom, normaltid)

              ; General preferences
              G90 ; Send absolute coordinates...
              M83 ; ...but relative extruder moves

              ; Network
              M550 P"Jellybean" ; Set machine name
              M552 S1 ; Enable network
              M587 S"Tilgin-YEnb6qLrkmkd" P"teyWohNsSE5a9" ; Configure access point. You can delete this line once connected
              M586 P0 S1 ; Enable HTTP
              M586 P1 S1 ; Disable FTP
              M586 P2 S1 T0 ; Disable Telnet

              ; Drives
              M350 X16 Y16 Z16 E16:16 I1
              M569 P0 S1 ; Drive 0 goes forwards
              M569 P1 S0 ; Drive 1 goes backwards
              M569 P2 S0 ; Drive 2 goes forwards
              M569 P3 S0 ; Drive 3 goes forwards
              M569 P4 S0 ; Drive 4 in reverse - E1
              M92 X200.00 Y200.00 Z400.00 E2750:2750 ; Set steps per mm
              M566 X600.00 Y600.00 Z200.00 E50.00:50 ; Set maximum instantaneous speed changes (mm/min)
              M203 X30000.00 Y30000.00 Z3000.00 E30000.00:30000 ; Set maximum speeds (mm/min)
              M201 X1500.00 Y1500.00 Z200.00 E1000.00:1000 ; Set accelerations (mm/s^2)
              M906 X1200.00 Y1200.00 Z1100.00 E600.00 I30 ; Set motor currents (mA) and motor idle factor in per cent
              M84 S30 ; Set idle timeout
              M593 F80 ; cancel ringing at 80Hz

              ; Axis Limits
              M208 X0 Y0 Z0 S1 ; Set axis minima
              M208 X227 Y226 Z330 S0 ; Set axis maxima

              ; Endstops
              M564 H0
              ;M574 Z0 S1 I1
              ;M574 X1 Y2 S0
              M574 X1 Y2 Z1 S0 ; Set active high endstops

              ; Z-Probe
              ;M558 P7 X0 Y0 Z1 H5 F900 T16000 ; Set Z probe type to 5, the axes for which it is used and the dive height
              ;G31 X-20 Y0 Z0.2 ; Set Z probe trigger value, offset and trigger height
              ;M557 X24:220 Y24:220 S15
              ;G29 S0

              ; Heaters
              M301 H0 S1.00 P10 I0.1 D200 T0.4 W180 B30 ; Use PID on bed heater (may require further tuning)
              M305 P0 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 0
              M143 H0 S140 ; Set temperature limit for heater 0 to 140C
              M305 P1 X201 ; Configure thermocouple for heater 1
              M143 H1 S350 ; Set temperature limit for heater 1 to 350C
              M307 H1 A256.4 C98.2 D7.3 S1.00 V24.5 B0
              M305 P2 X201

              ; Fans
              M106 P0 S0 I0 F50 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
              M106 P1 S0.35 I0 F255 H1 T50 ; Set fan 1 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

              M563 P0 D1 H1 ; Define tool 1
              G10 P0 X0 Y0 Z0 ; Set tool 1 axis offsets
              G10 P0 R0 S0 ; Set initial tool 1 active and standby temperatures to 0C

              ; Automatic power saving
              M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Set voltage thresholds and actions to run on power loss

              ; Custom settings are not configured

              ; Miscellaneous
              M501 ; Load saved parameters from non-volatile memory
              ;M574 D0 S0.02

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              • johnjohn1990undefined
                johnjohn1990
                last edited by

                delta config - m666 m665 is in override

                ; Configuration file for Duet WiFi (firmware version 1.21)
                ; executed by the firmware on start-up
                ;
                ; generated by RepRapFirmware Configuration Tool v2 on Tue Aug 20 2019 01:00:52 GMT+0200 (Centraleuropæisk sommertid)

                ; General preferences
                G90 ; Send absolute coordinates...
                M83 ; ...but relative extruder moves
                M665 R102 L216.5 B90 H304 ; Set delta radius, diagonal rod length, printable radius and homed height
                M666 X0 Y0 Z0 ; Put your endstop adjustments here, or let auto calibration find them

                ; Network
                M550 P"Deltabot" ; Set machine name
                M552 S1 ; Enable network
                M587 S"Tilgin-YEnb6qLrkmkd" P"teyWohNsSE5a9" ; Configure access point. You can delete this line once connected
                M586 P0 S1 ; Enable HTTP
                M586 P1 S1 ; Enable FTP
                M586 P2 S1 ; Enable Telnet

                ; Drives
                M569 P0 S1 ; Physical drive 0 goes forwards
                M569 P1 S1 ; Physical drive 1 goes forwards
                M569 P2 S1 ; Physical drive 2 goes forwards
                M569 P3 S0 ; Physical drive 3 goes forwards
                M569 P4 S0
                M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
                M92 X100.00 Y100.00 Z100.00 E160.00:280 ; Set steps per mm
                M566 X1200.00 Y1200.00 Z1200.00 E400.00:400 ; Set maximum instantaneous speed changes (mm/min)
                M203 X30000.00 Y30000.00 Z30000.00 E6000.00:600 ; Set maximum speeds (mm/min)
                M201 X3000.00 Y3000.00 Z3000.00 E9000.00:9000 ; Set accelerations (mm/s^2)
                M906 X1000.00 Y1000.00 Z1000.00 E800.00:1600 I30 ; Set motor currents (mA) and motor idle factor in per cent
                M84 S30 ; Set idle timeout

                ; Axis Limits
                M208 Z0 S1 ; Set minimum Z

                ; Endstops
                M574 X2 S1
                M574 Y2 S1
                M574 Z2 S1

                ; Z-Probe
                M558 P4 H2 F120 T6000 I1 ; Set Z probe type to unmodulated and the dive height + speeds
                G31 P500 X0 Y0 Z18 ; Set Z probe trigger value, offset and trigger height
                M556 S50 X0 Y0 Z0 ; Set orthogonal axis compensation parameters
                M557 R60 S10 ; Define mesh grid

                ; Heaters
                M305 P0 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 0
                M143 H0 S120 ; Set temperature limit for heater 0 to 120C
                M305 P2 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 1
                M143 H1 S280 ; Set temperature limit for heater 1 to 280C
                M143 H2 S280 ; Set temperature limit for heater 1 to 280C

                ; Fans
                M106 P1 S0.4 I0 F255 H2 T50 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned on
                M106 P0 S0 I0 F255 H-1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off
                M106 P2 S0 I0 F255 H-1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off

                ; Tools
                M563 P0 D1 H2 ; 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

                M501

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                • johnjohn1990undefined
                  johnjohn1990
                  last edited by

                  why would my config be relative, when i already have tested that it works fine with a new board ? - just wondering..

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                  • Phaedruxundefined
                    Phaedrux Moderator
                    last edited by

                    It just gives a clearer picture of how the printer is configured and can sometimes highlight other related or unrelated issues.

                    Z-Bot CoreXY Build | Thingiverse Profile

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                    • T3P3Tonyundefined
                      T3P3Tony administrators @johnjohn1990
                      last edited by

                      @johnjohn1990 how quickly does the MCU temperature rise from cold when you turn on? Also sorry to be a pain but can you try one of the boards with nothing plugged in and powered only by USB to see if the same temperature rise is observed?

                      www.duet3d.com

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                      • dc42undefined
                        dc42 administrators
                        last edited by

                        You said that a light on the printer is flashing or pulsating when the PID kicks in. What light is that, and how is it powered?

                        Duet WiFi hardware designer and firmware engineer
                        Please do not ask me for Duet support via PM or email, use the forum
                        http://www.escher3d.com, https://miscsolutions.wordpress.com

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