Unable to configure bed heater
-
My Duet is complaining about my bed heater taking too long to heat up. Note, in the past I had a separately powered heating pad. When it died, I decided to have a board control one.
I am using the original Duet 3 board (6HC) - firmware ver MB6HC 3.3RC2 (2021-05-11)
The power supply is 24V 500 watts
The bed heater is 24V 400 wattsThis is my code (H0 is the bed heater):
M308 S0 P"temp1" Y"thermistor" T100000 B4138
M950 H0 C"out2" T0
M307 H0 B1 S1.00
M140 H0
M143 H0 S120
M308 S1 P"temp0" Y"thermistor" T100000 B4138
M950 H1 C"out1" T1
M307 H1 B0 S1.00
M143 H1 S280I ran the heater configuration and followed the steps:
Auto tuning heater 0 completed after 5 idle and 9 tuning cycles in 1403 seconds. This heater needs the following M307 command:
M307 H0 B0 R0.300 C615.0 D1.30 S1.00 V22.7I do that and get this message:
Heater 0 appears to be over-powered. If left on at full power, its temperature is predicted to reach 209CI save with M500 anyway.
I even rebooted afterwards but still get this when I instruct via web control to heat the bed to 60
"Error: Heating fault on heater 0, temperature rising much more slowly than the expected 1.7°C/sec" -
@weevil
You have to read config-override by sending M501 at the end of config.g or in the Web interface. -
@o_lampe I always had this just above the tools lines, near the bottom:
; Miscellaneous
M501
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" -
@weevil post your full config and config override using the </> code tags.
Looks like it's not reading the tuned parameters (1.7deg/s is the default for a heater) -
@engikeneer You just gave me an idea. I'll try editing the M307 code.
-
@engikeneer EDiting the code directly didn't work either. It's still complaining.
-
post your full config and config override
-
@phaedrux config:
; Configuration file for Duet 3 (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2.1.8 on Thu Feb 20 2020 16:55:51 GMT-0800 (Pacific Standard Time); General preferences
G90
M83
M550 P"MYTH3D"M667 S1
M575 P1 B57600 S1; Networking
M552 P192.168.1.19 S1
M553 P255.255.255.0
M554 192.168.1.1
M586 P1 S1
M586 P2 S1
M552 S1; Drives
M569 P0.0 S1
M569 P0.1 S0
M569 P0.2 S1
M569 P0.5 S1
M569 P0.3 S1
M569 P0.4 S1
M584 X0.0 Y0.1 Z0.2:0.3:0.4 E0.5
M350 X16 Y16 Z16 E16 I1
M92 X80.00 Y80.00 Z400.00 E400.00
M566 X900.00 Y900.00 Z12.00 E120.00
M203 X6000.00 Y6000.00 Z180.00 E1200.00
M201 X500.00 Y500.00 Z20.00 E250.00
M906 X800 Y800 Z800 E800
M84 S30
M671 X-15:150:310 Y50:310:150 1S0.5; Axis Limits
M208 X0 Y0 Z0 S1
M208 X300 Y300 Z500 S0; Endstops
M574 X2 S1 P"io5.in"
M574 Y1 S1 P"io2.in"; Z-Probe
M950 S0 C"io7.out"
M558 P9 C"io7.in" H5 F120 T6000
G31 P25 X-38 Y0 Z1.05
M557 X15:227 Y5:210 S50; Heaters
M308 S0 P"temp1" Y"thermistor" T100000 B4138
M950 H0 C"out2" T0
M307 H0 B1 S1.00
M140 H0
M143 H0 S100
M308 S0 P"temp0" Y"thermistor" T100000 B4138
M950 H1 C"out1" T0
M143 H1 S280; Fans
M950 F1 C"out7" Q500
M106 P1 S1 H T45
M950 F0 C"out8" Q500
M106 P0 S255; Custom settings are not defined
; Miscellaneous
M501
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000"; Tools
M563 P0 S"MYTHprint" D0 H1 F0
M563 P0 D0 H1 F0
G10 P0 X0 Y0 Z0
G10 P0 R0 S0
T0Config override
; config-override.g file generated in response to M500 at 2021-05-23 11:36
; This is a system-generated file - do not edit
; Heater model parameters
M307 H0 R0.299 C620.600:620.600 D1.28 S1.00 V22.7 B0 I0
M307 H1 R1.970 C184.600:184.600 D5.04 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 Z0.00 -
I would suggest deleting the config-override.g file and then re-run the heater tuning with M303 and when it completes use M500 again to save it, which should create a fresh config-override.g file.
-
@phaedrux I'll give it a shot.
-
@phaedrux That did not work. I got the following message:
Warning: heater behaviour was not consistent during tuning
Auto tuning heater 0 completed after 4 idle and 25 tuning cycles in 3679 seconds. This heater needs the following M307 command:
M307 H0 B0 R0.317 C276.8 D1.57 S1.00 V22.7
Send M500 to save this command in config-override.gAs with all tests, the beep alarm would go off each time the bed heats up. I went ahead and saved the code with M500 but the issue remains. I would be happy if I could just disable the alert. It appears to function fine.
-
@phaedrux I think the issue is the board is treating the bed heater like a nozzle heater. It is running tests with the fan on and fan off.
These codes:
M308 S0 P"temp1" Y"thermistor" T100000 B4138
M308 S0 P"temp0" Y"thermistor" T100000 B4138They look identical. Perhaps there is a code for bed heaters.
-
@weevil said in Unable to configure bed heater:
I think the issue is the board is treating the bed heater like a nozzle heater. It is running tests with the fan on and fan off.
What M303 command are you using to tune the bed?
M303 T# will tune the heater as a tool with the fan
M303 H# will tune the heater as a heater without the fanhttps://duet3d.dozuki.com/Wiki/Gcode#Section_M303_Run_heater_tuning
-
@phaedrux I thought I was using H. I'll double-check when I get home. But the M308 command, shouldn't the T100000 B4138 be different for bed?
-
@weevil depends what thermistor you have. B4138 is the default the config tool uses so is almost certainly not right for your setup. You probably should find out the correct values for your thermistor (for both hotend and bed).
Having said that, it should only affect how accurate the measured temperature is (and probably won't make much difference at lower temperatures used by the bed). -
@engikeneer The thermistor for my Keenovo pad is an NTC100K if that helps.
Also note, the heated bed size is 300x300. -
@weevil said in Unable to configure bed heater:
The thermistor for my Keenovo pad is an NTC100K if that helps.
Chances are the B value should be B3950 in that case.
-
@phaedrux Thanks, I'll try that (fingers crossed).
-
@phaedrux M303 T# produces this error:
M303 H# tests with the fan
M303 T1 S60
Error: M303: tool 1 not found -
@weevil said in Unable to configure bed heater:
@phaedrux M303 T# produces this error:
M303 H# tests with the fan
M303 T1 S60
Error: M303: tool 1 not foundNot surprising...
M563 P0 S"MYTHprint" D0 H1 F0
M563 P0 D0 H1 F0You have configured Tool 0. There is no Tool 1.
Although I'm not sure why you are getting the fan running when the heater is.
Also you have a random H without a value:
M106 P1 S1 H T45
Doubt it's causing the problem, but can't hurt to fix.
Isolate, substitute, verify.
