Changing pt100 to standard thermistor
-
@Phaedrux I have a daughter board and pt100, recently installed to replace a damaged one but keep getting error messages so prefer to go back to a standard thermistor, any chance you could instruct me how to remove the pt100 and d-board and simply wire back a normal thermistor please? The d-board is easy enough to remove but i tried to originally wire the standard thermistor with the new direct drive extruder installed and it didn’t work caused f the existing daughter board and pt100, so I got a little lost and instead replaced the pt100, but it, and the heater block, might be a bit o/p so for safety’s sake i need to remove and go with standard thermistor, thanks in advance
Many thanks -
It would help to know what firmware version you're running and if you posted your current config.g so we can show you exactly what you need to change. You'll also need to know what thermistor values to use. What kind of thermistor is it? NTC100K 3950?
What errors were you getting with the daughterboard in place?
When you replaced the PT100, what did you replace it with?
-
; Configuration file for Anycubic Chiron
; Duet WiFi (firmware version 2.03); General preferences
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves; Network
M550 P"Anycubic Chiron" ; Set machine name
M551 P"" ; Set machine password
M552 S1 ; Enable network
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet; Configure Drives
M569 P0 S1 ; Drive 0 goes forwards
M569 P1 S0 ; Drive 1 goes backwards
M569 P2 S0 ; Drive 2 goes backwards
M569 P3 S0 ; Drive 3 goes backwards
M569 P4 S0 ; Drive 4 goes backwardsM584 X0 Y1 Z2:3 E4 ; Apply custom drive mapping
M671 X-40:440 Y200:200 ; Leadscrews position at right and left of the X axisM350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
M92 X80 Y100 Z398 E432 ; Set steps per mm
M566 X1200 Y1200 Z25 E120 ; Set maximum instantaneous speed changes (mm/min)
M203 X12000 Y12000 Z1000 E1200 ; Set maximum speeds (mm/min)
M201 X1000 Y800 Z250 E250 ; Set accelerations (mm/s^2)
M906 X1200 Y1200 Z1200 E960 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout; Dimensional Accuracy Adjustment
M579 X1.0025 Y0.9975 Z1.0025; Axis Limits
M208 X0 Y0 Z0 S1 ; Set axis minimum
M208 X401 Y400 Z445 S0 ; Set axis maximum; Endstops
M574 X1 Y1 S0 ; Set active low Endstops for X/Y Axis
M574 Z1 S1 ; Set active high Endstops for Z axis; Z-Probe - Microswitch
M558 P4 H4.42 F500 T6000 ; Set Z probe type to switch and the dive height + speeds
G31 P500 X0 Y0 Z15.58
M557 X0:400 Y0:400 S20 ; probe from X=0 to 415, Y=0 to 415mm with a mesh spacing of 20mm; Bed
M305 P0 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S120 ; Set temperature limit for heater 0 to 120C; Tool 0
M307 H1 A1230.8 C312.7 D7.2 S1.00 V26.3 B0
M305 P1 X200 ; Set PT100 + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C; Fans
M106 P0 H-1 S0 ; Set fan 0 value, Thermostatic control is turned off
M106 P1 T45 H1 S0 ; Set fan 1 value, Thermostatic control is turned on
M106 P2 H-1 S0 ; Set fan 0 value, Thermostatic control is turned off; Tools
M563 P0 D0 H1 F0:1 ; Define tool 0 - use extruder 0, heater 1 (and fan 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
T0 ; Select Tool 0; Automatic power saving
M911 S21 R23 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Set voltage thresholds and actions to run on power loss; Other
G29 S1 -
replaced with a PT100-550BW from amazon, but not sure what thermistor is in the sovol sv01 direct drive complete rig i bought
-
@Atraedes said in Changing pt100 to standard thermistor:
; Tool 0
M307 H1 A1230.8 C312.7 D7.2 S1.00 V26.3 B0
M305 P1 X200 ; Set PT100 + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280CIt's the M305 P1 X200 that configures it to use a PT100.
Compare that to the M305 line for the bed which is using a thermistor.
You'd change the X200 to be the thermistor values for your new thermistor.
M305 P1 T100000 B3950for example, is what you'd use for a generic NTC100K 3950 thermisor. -
the first errors were what i mentioned before about the temp warning that the heater was over powered and may get to over 2k c, but then also intermittent heater 1 faults and i have to reset all the time, the daughter board seems ok but i guess i may have got a pt100 to big perhaps?
-
@Atraedes said in Changing pt100 to standard thermistor:
sovol sv01
according to this
https://github.com/CopterTec/Marlin-Sovol_SV01/blob/master/config/SOVOL/SV01/Configuration.h
EPCOS 100k
-
Can you also post the results of M122?
Is your power supply 12v or 24v?
Is the heater cartridge 12v or 24v?
Normally the warning of over powered heater is just a warning, but your estimated temp of 1500c or whatever it was is abnormally large. That makes me worry that your heater cartridge may be 12v and your power supply 24v, which would be a dangerous combination.
-
sorry tried m122 but its says the response is to long
-
Send it from the console tab
-
ok i will take a pic, 2 secs
-
) -
@Veti cheers mate
-
@Phaedrux M122
=== Diagnostics ===
RepRapFirmware for Duet 2 WiFi/Ethernet version 2.05.1 running on Duet WiFi 1.02 or later
Board ID: 08DJM-9178L-L2MS8-6JKFL-3SD6N-KVGQN
Used output buffers: 3 of 24 (17 max)
=== RTOS ===
Static ram: 25712
Dynamic ram: 93176 of which 0 recycled
Exception stack ram used: 320
Never used ram: 11864
Tasks: NETWORK(ready,628) HEAT(blocked,832) MAIN(running,3728) IDLE(ready,160)
Owned mutexes:
=== Platform ===
Last reset 00:18:35 ago, cause: power up
Last software reset time unknown, reason: User, spinning module GCodes, available RAM 11956 bytes (slot 0)
Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0441f000 BFAR 0xe000ed38 SP 0xffffffff Task 0x4e49414d
Error status: 0
Free file entries: 10
SD card 0 detected, interface speed: 20.0MBytes/sec
SD card longest block write time: 0.0ms, max retries 0
MCU temperature: min 28.3, current 28.4, max 28.8
Supply voltage: min 26.3, current 26.4, max 26.5, under voltage events: 0, over voltage events: 0, power good: yes
Driver 0: standstill, SG min/max not available
Driver 1: standstill, SG min/max not available
Driver 2: standstill, SG min/max not available
Driver 3: standstill, SG min/max not available
Driver 4: standstill, SG min/max not available
Date/time: 2021-01-11 21:09:04
Cache data hit count 3407316226
Slowest loop: 3.10ms; fastest: 0.07ms
I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 0
=== Move ===
Hiccups: 0, FreeDm: 160, MinFreeDm: 160, MaxWait: 0ms
Bed compensation in use: mesh, comp offset 0.000
=== DDARing ===
Scheduled moves: 0, completed moves: 0, StepErrors: 0, LaErrors: 0, Underruns: 0, 0
=== Heat ===
Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1
Heater 1 is on, I-accum = 0.0
=== GCodes ===
Segments left: 0
Stack records: 1 allocated, 0 in use
Movement lock held by null
http is idle in state(s) 0
telnet is idle in state(s) 0
file is idle in state(s) 0
serial is idle in state(s) 0
aux is idle in state(s) 0
daemon is idle in state(s) 0
queue is idle in state(s) 0
autopause is idle in state(s) 0
Code queue is empty.
=== Network ===
Slowest loop: 201.14ms; fastest: 0.08ms
Responder states: HTTP(0) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0) Telnet(0)
HTTP sessions: 1 of 8- WiFi -
Network state is running
WiFi module is connected to access point
Failed messages: pending 0, notready 0, noresp 4
WiFi firmware version 1.23
WiFi MAC address cc:50:e3:e3:ad:08
WiFi Vcc 3.40, reset reason Turned on by main processor
WiFi flash size 4194304, free heap 23952
WiFi IP address 192.168.0.28
WiFi signal strength -58dBm, reconnections 0, sleep mode modem
Socket states: 0 0 0 0 0 0 0 0
- WiFi -
-
@Phaedrux said in Changing pt100 to standard thermistor:
M305 P1 T100000 B3950
so M305 P1 T100000 B3950 is the g code for the standard epcos 100k thermistor i can install instead? and then just wire it to the conventional thermistor terminal instead and simply remove the daughter board?
-
@Atraedes said in Changing pt100 to standard thermistor:
Supply voltage: min 26.3, current 26.4, max 26.5, under voltage events: 0, over voltage events: 0, power good: yes
Your power supply seems to be tuned a bit high. Can you carefully check the output voltage with a multimeter?
Are you sure your hotend heater cartridge is 24v?
-
@Atraedes said in Changing pt100 to standard thermistor:
@Phaedrux said in Changing pt100 to standard thermistor:
M305 P1 T100000 B3950
so M305 P1 T100000 B3950 is the g code for the standard epcos 100k thermistor i can install instead? and then just wire it to the conventional thermistor terminal instead and simply remove the daughter board?
Correct.
-
@Phaedrux i thought so to lol, but the multimeter is at the inlaws and i cant get it back, lockdown lol, but thanks, i will check it when i get it back
-
@Phaedrux fantastic, many thanks, so programme the G-Code first and then wire it in, or it doesn't matter? I cant say for sure about the heater cartridge as i have so many spares lying around it might very well be a 12v but I didn't think it was due to its size, but now that i can rewire to the standard thermistor i have the complete hotend for the direct drive rig, sir, thanks again for your assistance, much appreciated!
-
If your PSU has a trim pot for adjusting the output voltage try giving it a slight tweak and see if it reduces the value in the M122 a bit. Aim for 24v.
Then if you connect your new thermistor and run a PID tuning see if the warning is the same. If it still estimates a 1000c+ max temp you should beware.
You can also check your thermistor resistance with a multimeter to see if it's closer to 12v or 24v, but.. multimeter...
