Posts made by Argiros Apostolos

@Phaedrux
After connecting everything and trying a PID tune because of the very large heat capacity of the aluminum plates the initial climb of the temp was very slow. The set temperature was 40 degrees. After around 4 minutes the bed reached that temperature and power was turned off. The temperature kept climbing until 113 degrees!
Also because of the large load it's not good to turn it on and off very frequently I tried lowering the power factor and the PWM frequency but its still too fast. So I thought that I will turn to bang bang control.
Apart from the initial peak temperature the control works very fine because it keeps the temperature with around 1 degree accuracy which is quite acceptable for this large format (and it will become more accurate when closing the printer [less loses] ).
For now my heat up procedure goes like:

1. Set bed temperature to 30 degrees
2. Wait when it peaks at around 62 degrees
3. Set bed temperature to 60 degrees
4. It turns on every around 3 minutes for 15 seconds and then off again and goes from 59.9 to 60.8
   Is there a way to set for example a set time for a heater to be on?
   Also is there a wait function?
   In order to write a heat up g-code.
   Thank you in advance!

Thank you very much!

The bed is a 1m^2 aluminum plate with 15mm height and the heating element is oven resistors 18 of them each one around 600w so we have a total of around 10kW. I have 5 thermistors one in the center of the bed and 4 of them around 300mm from each corner of the bed. I haven't yet powered them up I was just asking if I can eliminate the average power of the resistors and give some delay for the heat to spread (with for example half time on half time off during the heat up procedure).

Thank you for your quick reply! I know that function but my problem is that I don't want the heating element to be on for more than a few seconds because it reaches very high temperatures.

I have a duet 2 wifi and I want to control my heatbed with SSR. I have made the connection and everything works ok, but I want a maximum on time for the SSR during continuous heating at the beginning of the heating procedure when the SSR is always on (for example when going from 25 to 60degrees before the PID procedure turns on). I want that for heat spread across my bed. Is there a way to program duet do that? Thank's in advance!

Thank you very much now all axis home perfect.

I have changed some of my connections and now i can successfully home my x and y axis but not the z axis (again i have the problem of the motor not stopping despite the fact that the led on the induction sensor is light up) (and the induction probe for the z axis is connected to the E0 stp pin threw a schottky diode).

Also i have updated my duet wifi firmaware to version 1.21 and now when i just try to move an axis this message appears:
This appears for the x axis:
M120
G91
G1 X10 F6000
M121
Error: G0/G1: insufficient axes homed
Error: Pop(): stack underflow!

I have tried that and again it doesn't stop when the switch is triggered.

All of the x y and z axis fail to home

I have tested and calibrated the x and y end stop switches and despite the fact that they work as decribed in the link when i excecute the homing function despite the fact that the switches are touched and there is a change in the board leds the stepper motors doesn’t stop so i can’t calibrate the induction sensor i have for the z axis

I have tried multiple times to home all of the axis both individually and simultaneously but despite the fact that all of them move in the right direction when they hit the end stop switches (or come close to the induction sensor for the z axis and the led on the board goes off for the x and y axis and on for z the motors doesn't stop which forces me to execute the emergency stop function.

Here are and the homing files for this setup.

Homing file for z axis:

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool on Thu May 03 2018 12:42:37 GMT+0300 (EEST)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 Z-185 F1800 ; move Z down until the switch triggers
G92 Z0 ; set Z position to trigger height

; Uncomment the following lines to lift Z after probing
;G91 ; relative positioning
;G1 Z5 F100 S2 ; lift Z relative to current position
;G90 ; absolute positioning

Homing file for y axis:

; homey.g
; called to home the Y axis
;
; generated by RepRapFirmware Configuration Tool on Thu May 03 2018 12:42:37 GMT+0300 (EEST)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 Y-275 F1800 ; move quickly to Y axis endstop and stop there (first pass)
G1 Y5 F6000 ; go back a few mm
G1 S1 Y-275 F360 ; move slowly to Y axis endstop once more (second pass)
G1 Z-5 F6000 S2 ; lower Z again
G90 ; absolute positioning

Homing file for x axis:

; homex.g
; called to home the X axis
;
; generated by RepRapFirmware Configuration Tool on Thu May 03 2018 12:42:37 GMT+0300 (EEST)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 X-295 F1800 ; move quickly to X axis endstop and stop there (first pass)
G1 X5 F6000 ; go back a few mm
G1 S1 X-295 F360 ; move slowly to X axis endstop once more (second pass)
G1 Z-5 F6000 S2 ; lower Z again
G90 ; absolute positioning

Homing file for all:

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool on Thu May 03 2018 12:42:37 GMT+0300 (EEST)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 X-295 Y-275 F1800 ; move quickly to X and Y axis endstops and stop there (first pass)
G1 X5 Y5 F6000 ; go back a few mm
G1 S1 X-295 Y-275 F360 ; move slowly to X and Y axis endstops once more (second pass)
G1 S1 Z-185 F1800 S1 ; move Z down stopping at the endstop
G90 ; absolute positioning
G92 Z0 ; set new Z position
;G1 Z5 F100 S2 ; uncomment this line to lift the nozzle after homing

First of all i have NC switches for the x axis and y axis and an induction probe for the z axis which is connected to the E0 stp pin threw a schottky diode. All of the switches are recognised by the board but when i am about to home all of the axis while the leds of x and y axis goes off and the E0 axis goes on the steppers doesn't stop. Any suggestions will be kindly accepted.
Also i have mapped z axis to y axis and y axis to z axis.

Config file:
; General preferences
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
M555 P1 ; Set firmware compatibility to look like RepRapFirmare

; Network
M550 PMy printer ; Set machine name
M552 S1 ; Enable network
;*** Access point is configured manually via M587
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet

; Drives
M569 P0 S0 ; Drive 0 goes backwards
M569 P1 S1 ; Drive 1 goes forwards
M569 P2 S1 ; Drive 2 goes forwards
M569 P3 S0 ; Drive 3 goes backwards
M584 X0 Y2 Z1 E3 ; Apply custom drive mapping
M350 X256 Y256 Z256 E16 I0 ; Configure microstepping without interpolation
M92 X1089 Y1089 Z15432 E100 ; Set steps per mm
M566 X900 Y900 Z12 E600 ; Set maximum instantaneous speed changes (mm/min)
M203 X8400 Y8400 Z8400 E3000 ; Set maximum speeds (mm/min)
M201 X500 Y500 Z250 E250 ; Set accelerations (mm/s^2)
M906 X1000 Y1600 Z2000 E800 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 S1 ; Set axis minima
M208 X290 Y270 Z180 S0 ; Set axis maxima

; Endstops
M574 E0 S0 ; Set active low endstops
M574 X1 Y1 S1 ; Set active high endstops

; Z-Probe
M558 P4 X0 Y0 Z1 H5 F120 T6000 I1 ; Set Z probe type to switch, the axes for which it is used and the dive height + speeds
G31 P600 X0 Y0 Z2 ; Set Z probe trigger value, offset and trigger height
M557 X15:275 Y15:255 S20 ; Define mesh grid

; Heaters
M305 P0 T100000 B3970 C0 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S120 ; Set temperature limit for heater 0 to 120C
M305 P1 T100000 B3970 C0 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C
M307 H0 A162.2 C1576.9 D21.4
M307 H1 A498.8 C146.2 D17.1

; Fans
M106 P0 S0.3 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H0 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P2 S1 I0 F500 H1 T45 ; Set fan 2 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

; Custom settings are not configured