Bed heating starting with lag
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Hey!
I have been having an issue with the bed heating lately. Whenever I power on my printer and order the bed to heat up to 60C, it doesn't do anything for a couple of minutes. After that, the temperature curve is normal, no issues with either heating the bed or keeping temperature in it.
Moreover, after finishing a print, for example, whenever I set the bed temp to 60C again, it starts heating immediately.
I'm using RRF 3.3 and DWC 3.3.0 on a Duet 2 WiFi.
I've attached a couple of screenshots from the DWC interface. I selected the bed temp a few seconds after starting up the machine and you can see that it took more than 2 minutes before the temp started rising. No errors in the console.
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@tetele Do you have a different PSU you can try with? looks like a supply issue with that undervoltage event
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@jay_s_uk no no, that's from when I turned off the printer almost an hour before. The reason I left it there is so that you can see that the "Connection established" message was the only one in that session.
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@tetele after starting your printer please run M98 P"0:/sys/config.g" to see if there are no sneaky errors that are not captured while DWC is reconnecting.
Please post your config.g here (using the </> in the text formatting to make it easy to deal with.
Finally also try sending M140 S60 and see if you get the same lag.,
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@t3p3tony said in Bed heating starting with lag:
@tetele after starting your printer please run M98 P"0:/sys/config.g" to see if there are no sneaky errors that are not captured while DWC is reconnecting.
Oops, looks like there are
Please post your config.g here (using the </> in the text formatting to make it easy to deal with.
; Configuration file for Duet WiFi (firmware version 3) ; executed by the firmware on start-up ; ; generated by RepRapFirmware Configuration Tool v3.1.7 on Sat Nov 21 2020 18:28:03 GMT+0200 (Eastern European Standard Time) ; General preferences G90 ; send absolute coordinates... M83 ; ...but relative extruder moves M550 P"BLV MGN Cube" ; set printer name M669 K1 ; select CoreXY mode ; Network M552 S1 ; enable network M586 P0 S1 ; enable HTTP M586 P1 S0 ; disable FTP M586 P2 S0 ; disable 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 S1 ; physical drive 3 goes forwards M569 P4 S1 ; physical drive 4 goes forwards M584 X0 Y1 Z2:4 E3 ; set drive mapping M671 X-61:368 Y155:155 S1.5 ; leadscrews at left (connected to Z) and right (connected to E1) of X axis, max correction 1.2mm M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation M92 X200.00 Y200.00 Z400.00 E684 ; set steps per mm M566 X600.00 Y600.00 Z60.00 E1200.00 ; set maximum instantaneous speed changes (mm/min) M203 X12000.00 Y12000.00 Z1200.00 E1200.00 ; set maximum speeds (mm/min) M201 X10000.00 Y10000.00 Z60.00 E6600.00 ; set accelerations (mm/s^2) M906 X1600 Y1600 Z1600 E600 I30 ; set motor currents (mA) and motor idle factor in per cent M84 S30 ; Set idle timeout ; Axis Limits M208 X-7 Y-10 Z0 S1 ; set axis minima M208 X325 Y330 Z330 S0 ; set axis maxima ; Endstops M574 X1 S1 P"xstop" ; configure active-high endstop for low end on X via pin xstop M574 Y1 S1 P"ystop" ; configure active-high endstop for low end on Y via pin ystop M574 Z1 S2 ; configure Z-probe endstop for low end on Z ; Z-Probe M950 S0 C"exp.heater3" ; create servo pin 0 for BLTouch M558 P9 C"^zprobe.in" H5 F120 T8400 ; set Z probe type to bltouch and the dive height + speeds G31 P25 X-33.5 Y-5 Z3.085 ; set Z probe trigger value, offset and trigger height M557 X35:280 Y27:270 S40 ; define mesh grid ; Heaters M308 S0 P"bedtemp" Y"thermistor" T100000 B4092 ; configure sensor 0 as thermistor on pin bedtemp M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0 M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit M140 H0 ; map heated bed to heater 0 M143 H0 S120 ; set temperature limit for heater 0 to 120C M308 S1 P"e0temp" Y"thermistor" T100000 B4725 C7.06e-8 ; configure sensor 1 as thermistor on pin e0temp M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1 M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit M143 H1 S300 ; set temperature limit for heater 1 to 300C ; Fans M950 F0 C"fan2" Q500 ; create fan 0 on pin fan2 and set its frequency M106 P0 C"Part cooling" S0 H-1 ; set fan 0 name and value. Thermostatic control is turned off M950 F1 C"fan1" Q500 ; create fan 1 on pin fan1 and set its frequency M106 P1 C"Hotend" S1 H1 T35:65 ; set fan 1 name and value. Thermostatic control is turned on ; Tools M563 P0 S"Dragon" D0 H1 F0 ; 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 ; Custom settings ; M572 D0 S0.044 ; Miscellaneous M501 ; load saved parameters from non-volatile memory M80 ; start the power supply M911 S20 R22 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss ;T0 ; select first tool M593 F37.5 ; set Dynamic Acceleration Adjustment resonance frequency to cancelFinally also try sending M140 S60 and see if you get the same lag.,
Same thing
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@tetele ok so the warnings/info reported when running config.g are ok. just letting you know what network is enabled and explaining that as your heater is currently modelled by the firmware it could get quite hot if given full power with no temperature control.
I cant see anything in your config that will cause the problem. Can you also post your config-override.g here please.
I can't say definitively that it should fix the problem but you can try updating to 3.4b5
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@t3p3tony said in Bed heating starting with lag:
I cant see anything in your config that will cause the problem. Can you also post your config-override.g here please.
; config-override.g file generated in response to M500 at 2021-10-01 17:07 ; This is a system-generated file - do not edit ; Heater model parameters M307 H0 R0.260 C650.369:650.369 D9.48 S1.00 V23.7 B0 I0 M307 H1 R2.738 C170.183:147.614 D4.85 S1.00 V23.9 B0 I0 ; Workplace coordinates G10 L2 P1 X0.00 Y0.00 Z0.00 G10 L2 P2 X0.00 Y0.00 Z0.00 G10 L2 P3 X0.00 Y0.00 Z0.00 G10 L2 P4 X0.00 Y0.00 Z0.00 G10 L2 P5 X0.00 Y0.00 Z0.00 G10 L2 P6 X0.00 Y0.00 Z0.00 G10 L2 P7 X0.00 Y0.00 Z0.00 G10 L2 P8 X0.00 Y0.00 Z0.00 G10 L2 P9 X0.00 Y0.00 Z0.00I can't say definitively that it should fix the problem but you can try updating to 3.4b5
I don't think it's a software issue, as it was working fine with the same 3.3 version a while ago, as I remember. I just haven't used my printer for about a month and then this started happening.
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I have an update here. During the lag period when the bed does not start heating, the LED indicator flashes about twice a second. After a while, it turns on (PWM 100%) and the bed starts heating up.
In this video I turn the bed temp up to 60 (from 0) at ~0:29 https://imgur.com/a/79HpQHN
The bed leads are well connected in the socket, so that does not seem to be the issue.
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@tetele does the soldering of the bed heater terminal block, VIN terminal block and bed heater fuse on the underside of the board look OK?
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 -
@dc42 they look good to me
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@tetele said in Bed heating starting with lag:
In this video I turn the bed temp up to 60 (from 0) at ~0:29 https://imgur.com/a/79HpQHN
ok that is interesting. It looks like the bed heater is turning on and off repeatedly (but not long enough for a significant temperature rise). I agree it does not look like a physical wiring issue at the board end.
What is the rating of the heatbed you are using?
While the heater is in the initial flashing phase, is the mosfet getting noticeably warm to the touch?
Another test you could try is temporarily switching the bed heater out for your extruder heater. swap the temperature controls as well and still control the bed heater as a bed. the idea is to see if it behaves the same way with a different (lower) load. -
@t3p3tony said in Bed heating starting with lag:
What is the rating of the heatbed you are using?
It doesn't say. It's a 24V PCB bed that came in this kit, but I can tell you that the power draw from the mains during bed heating (according to my Gosund P1 smart power socket) is ~400-430W with a 24V PSU and a Duet-only 5V PSU. I guess it's rated at about 350-400W.
While the heater is in the initial flashing phase, is the mosfet getting noticeably warm to the touch?
Is that the one right next to the fuse and the bed heater terminal block? If so, it stays cooler than my body temperature until the bed actually starts warming up.
Another test you could try is temporarily switching the bed heater out for your extruder heater. swap the temperature controls as well and still control the bed heater as a bed. the idea is to see if it behaves the same way with a different (lower) load.
Got it. I can't do that now, but I will try soon.
Thanks for helping me debug this!
