automatic switch off printer

ErwinH78

Hi Guys,

I wired an a relay and now it´s possible to switch off the printer with M42 P4 S255 via Out9 .

Is it also possible if the temperature of heating bed, nozzle or print camber is too high to switch off automatically via the board?

i mean to check the configurated thermistors and if they are too hot to send the command...
like switch on hotend fan at 45 degree

Phaedrux

Check out M143

https://duet3d.dozuki.com/Wiki/Gcode?revisionid=HEAD#Section_M143_Maximum_heater_temperature

You could also monitor temps and take actions using conditional gcode and daemon.g file that runs on loop in the background.

OwenD

@ErwinH78
If you control your relay via the ps_on pin then I believe in later firmware versions RRF will send M81 on a heater fault
That would also allow you to defer shutting down until the hotend is cool etc. using M81 S1
Otherwise do it in daemon.g

ErwinH78

thx. i´m already using M143 in my config:
if there is an fault with the ssr the heatbed can´t be switched off by that... so i want to send command via out9 to my relais. this will power off the main switch.

M308 S0 P"temp1" Y"thermistor" A"Heizbett" T100000 B4138 ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out1" T0 ; create bed heater output on out0 and map it to sensor 0
M143 H0 S135 ; set temperature limit for heater 0 to 135C
M140 H0 ; map heated bed to heater 0
;M307 H0 R0.633 C343.0 D3.15 S0.6 V24.2 ; disable bang-bang mode for the nozzle heater and set PWM limit and PID settings
M307 H0 R0.666 C300.5 D2.33 S0.60 V24.2 ;110 Grad 60% Leistung

;Nozzle
M308 S1 P"temp0" Y"thermistor" A"Nozzle" T100000 B4725 C7.06e-8 ; configure sensor 1 as thermistor on pin temp1
M950 H1 C"out0" T1 ; create nozzle heater output on out0 and map it to sensor 1
M143 H1 S280 ; set temperature limit for heater 1 to 280C
M307 H1 R1.360 C368.300:368.300 D5.30 S1.00 V24.1 B0 ; disable bang-bang mode for the nozzle heater and set PWM limit and PID settings

ErwinH78

@OwenD hmmm ok. my plan is to monitoring 4 temperatures. Heatbed, nozzle, print camber and one thermistor in my electronic bay... if there is the temperature over an set limit the printer should power off.

with M42 P4 S255 i can power off the printer but i´m not sure to handle this depending of four temperatures

ErwinH78

;Switch Off Printer
M950 P4 C"out9"

OwenD

@ErwinH78
I do it in daemon.g
It loops about once per second depending on what you have in it.

Note, I'm using RRF 3.3b2 which allows variables which I use to only do the check every 20 seconds or so.

You'd need to put your M42 commands in where I have M81

; 0:/sys/daemon.g
; runs continually in background at approximately 1Hz if not delayed internally


;HEATER CHECKS

; this section of daemon.g checks for heater faults
; RRF doesn't currently check for faults when idle but by default will shutdownduring printing if temperature excursion is > 15 degrees.
; Note: temp excursion value and time  may be manually set using M570
; checking if temp is rising requires a variable.  I have used a variable called global.LastCheckTime (which is created in config.g and set to zero)  for this and to do elapsed time since last check
; G4 could be used but would also delay anything else in daemon.g
; this way allows other checks to run more frequently if needed however the G4 delays inside the loop will affect the frequency of daemon.g
; will be updated when variables are available in RRF.
while iterations < #heat.heaters ; loop through all configured heaters
	if state.upTime < 60
		break; If uptime is < 60 seconds, break out so all fans etc have time to stabilise.
	
	if ((global.LastCheckTime+10) > state.upTime) ; if checked in last 10 seconds escape loop and go to rest of daemon.g if present.  offset will be zero at startup via config.g
		;echo "skipping loop " ^ " " ^ state.upTime  ^ " " ^ global.LastCheckTime+10
		if global.LastCheckTime - state.upTime > 60 ; uptime must have rolled over so reset off set to zero
			G10 P2 Y0
			echo "upTime has rolled over.  Heater checking reset"
		break
	;echo "checking heater " ^ iterations ^ " " ^ state.upTime  ^ " " ^ global.LastCheckTime+10
	if heat.heaters[iterations].state="tuning"
		;echo "heater " ^ iterations ^ " is tuning - no check carried out"
		continue ; don't check this heater as it is PID auto tuning
	if (heat.heaters[iterations].current) > (heat.heaters[iterations].max) ; temp is over max so emergency shutdown required
		;M41 P5 S1  ; activate output connected to externally powered latching relay here to sound alarm
		echo "heater over max temp fault detected in daemon.g.  - shutting down"
		M112; emergency shutdown
		M81 S1 ; turn off power when fans have turned off
	if (heat.heaters[iterations].current > 45)  &&  (heat.heaters[iterations].active > 45); no real danger at below this temp as ambient may be close to this
		;echo "heater " ^ iterations ^ " is above 45 degrees"
		if (heat.heaters[iterations].state!="off") && (heat.heaters[iterations].current > heat.heaters[iterations].active + 15) ; temp is > 15 degrees above target.
		;echo "heater " ^ iterations ^ " is on or in standby - checking if temp is rising"
			set global.LastTemp = heat.heaters[iterations].current ; set the last check temp
			G4 S3 ; wait 3 seconds
			if (heat.heaters[iterations].current > global.LastTemp + 0.5) ; heat is rising by more than 0.5 degrees in 3 seconds
				echo "heater runaway fault detected in daemon.g.  - shutting down"
				if (state.status=="processing")
					M25 ; pause print so you might be able to save it using M119
				;M41 P5 S1  ; activate output connected to externally powered latching relay here to sound alarm
				M0 ; unconditional stop.  If axes are homed and a print is being canceled will run cancel.g  otherwise will run stop.g
				M81 S1 ; turn off power when fans have turned off
			else
				;echo "heater is on or standby but temp is falling on heater " ^ iterations ^ " - no action needed"
		elif (heat.heaters[iterations].state="off") && ((heat.heaters[iterations].current) >= (fans[1].thermostatic.lowTemperature+0)) ; if heater is off and temp is greater than 50 there could be an issue
			;echo "heater " ^ iterations ^ " is off but checking if temp is rising"
			set global.LastTemp = heat.heaters[iterations].current;
			G4 S3 ; wait 3 seconds
			if (heat.heaters[iterations].current > global.LastTemp + 0.5) ; heat is rising by more than 0.5 degrees in 3 seconds
				;echo "heater is off but temp is rising on heater " ^ iterations ^ "emergency shutdown"
				;M41 P5 S1  ; activate output connected to externally powered latching relay here to sound alarm
				echo "heater runaway fault detected in daemon.g.  - shutting down"
				M112; emergency shutdown
				M81 S1 ; turn off power when fans have turned off
			else
				;echo "heater is off & temp is falling or stable on heater " ^ iterations ^ " - no action needed"
	else
		;heater is below 45 degrees so only other fault may be an open circuit thermistor which should show -275 degrees
		if heat.heaters[iterations].current < 0 ; we probably have a thermistor fault if heater is less than 0 degrees
			M112 ; emergency shutdown
			M81 S1 ; turn off power when fans have turned off

	;Check if water pump is running correctly
	if (iterations=1) && ((heat.heaters[1].current) > (fans[1].thermostatic.lowTemperature+0))
		if fans[1].rpm <= 500 ; Coolant pump RPM off or low
			G4 S3 ; check again in 3 seconds in case it's just spinning up
			if fans[1].rpm <= 500
				echo "Water pump fault - shutting down heaters - RPM : " ^ fans[1].rpm
				M25 ; pause print so you might be able to save it using M119
				M0 ; unconditional stop.  If axes are homed and a print is being canceled will run cancel.g  otherwise will run stop.g
				M81 S1 ; turn off power when fans have turned off
		elif (fans[1].rpm > 500) && (fans[1].rpm < 1400)
			G4 S3 ; check again in 3 seconds in case it's just spinning up
			if (fans[1].rpm > 500) && (fans[1].rpm < 1400)
				echo "WARNING: Water pump RPM low - RPM : " ^ fans[1].rpm
				if (state.status=="processing")
					M25 ; pause print so you might be able to save it using M119
					;M41 P5 S1  ; activate output connected to externally powered latching relay here to sound alarm
					M0 ; unconditional stop.  If axes are homed and a print is being canceled will run cancel.g  otherwise will run stop.g
					M81 S1 ; turn off power when fans have turned off
		else
			;echo "Coolant OK - RPM : "  ^ fans[1].rpm
			
		if fans[2].rpm <=1000
			echo "WARNING: Water pump FAN RPM low - RPM : " ^ fans[2].rpm
			if (state.status=="processing")
				M25 ; pause print so you might be able to save it using M119
				;M41 P5 S1  ; activate output connected to externally powered latching relay here to sound alarm
				M0 ; unconditional stop.  If axes are homed and a print is being canceled will run cancel.g  otherwise will run stop.g
				M81 S1 ; turn off power when fans have turned off

	if iterations == #heat.heaters-1 ; all heaters have been checked
		set global.LastCheckTime = state.upTime ; set the new time to check


; END HEATER CHECKS


; run other checks

;G4 S10 ; pause daemon.g for 10 seconds before next run

ErwinH78

ah ok thx. i check that out...

to run this daemon.g i have this to start in config or it starts automatically

OwenD

@ErwinH78
you create it in the SYS folder
0:\sys\

Once created it will start to run.

Note!
To edit it or delete it, you must first rename it.

ErwinH78

understood. thx