Posts made by gen2eng

More or less the same request but additional uses.

https://forum.duet3d.com/topic/5370/m106-feature-request-limit-max-pwm-parameter

@dc42 Thank you!

Yes, and limiting the max PWM is to mistake proof and protect against damage.

It would be more applicable to brushed motors than brushless motors

It would be nice to have a M106 parameter similar to L that would limit the maximum PWM value for a fan.

Usage:

• I was brain dead and discovered 2 hours into a 12 hour print that I really don't want to run my fan as hard as it is to minimize heat rise in the motor. A quick command in the console saves the day to cap the maximum value.
• Fan needs to be limited in an office environment with several newbies who are learning. Once again, brushed layer fan only wants to be run at 80% for extended period to times to reduce heat.

For what it's worth, I've seen two pancake steppers from a well known extruder manufacturer fail.

One was a short like dc42 is suggesting and the other had weak/failed permanent magnets in the rotor. Running a stepper too hot can cause both failures.

I've been using the Atomic Carbon Fiber PETG in a CoreXY for all motion components and love it.

• It's "seems" to dissipate heat a bit better... (subjective). I recently completed a 10.5 hour print with steppers bolted right to the parts and they are running near 80% current and are quite warm. I'm not detecting an heat creep. The surface of the part is warm at the stepper, but it quickly dissipates and does not heat soak the part.
• It's electrically conductive.
• It's much stiffer without being to brittle.
• Very little issue with stringing
• Very little issue with warping (Printing on PEI at 50-55C)

When comparing prices, Atomic Carbon filament is a full 1kg spool at less cost than a 3/4kg spool.

I've just completed a 10.5 hour print on this release without issue. It appears to be stable with the exception of the weird simulation hang. After a hard reset, the simulation ran fine.

@hergonoway said in Berd-Air pump configuration notes for Duet users:

@gen2eng

So you've set M106 with F25500 as PWM frequency parameter? I've got the same configuration and mofset is well cooled, just asking before changing the configuration.

Correct, I'm using F25500 on a 24V (1.03 Duet Wifi) and 12V (0.85 Duet) without issue. I've got a flyback on both. The 0.85 needs the external flyback, but the 1.03 does not. I am not using the eSwitch module.

@gen2eng said in Firmware 2.0RC2b/1.21.1 RC2b released:

@dc42

It was hanging at about 41sec. I did a hard reset and simulation ran fine on a different file. After the current print job finishes, I will try again.

I tried the simulation immediately after the upgrade. Any chance it needed a hard reset?

I'm running on a 1.03 Duet Wifi.

Ran it again, and it did not hang. The original hang was around 41% complete, not 41 sec.

@dc42

It was hanging at about 41sec. I did a hard reset and simulation ran fine on a different file. After the current print job finishes, I will try again.

I tried the simulation immediately after the upgrade. Any chance it needed a hard reset?

I'm running on a 1.03 Duet Wifi.

RC3 is hanging when running a simulation on the attached file.

0_1526229112337_CFDMP_Skew Tower.gcode

I'm been slowly commissioning a CoreXY machine. I've been using a carbon fiber filled PETG filament for rigidity and better heat resistance. The stepper brackets are fastened securely to a 20x20 anodized aluminum frame and the steppers are fastened to brackets using the usual 3mm screws. I've not attached any bonding wires between the frame and motors.

On a whim this morning after reading this thread, I check for continuity between my printer frame and the steppers and I have about 30 KOhms resistance between the body of the steppers and the mains ground. It's not highly conductive, but it's enough to be considered static dissipative and prevent a build up.

I've been using:

• The flyback diode provided with the eSwitch kit, sans the rest of the kit.
• The current limiting thermistor DC42 linked to.

I'm getting great results at 25kHz freqency. Prior to changing the frequency, my minimum operating range was about 25%. I'm now able to operate at 20%, and my understanding is the current limiting thermistor is dropping voltage a touch based on the ~30 Ohm resistance I measured when checking my circuit.

Thanks for this!

I've confirmed much improved noise level and less heat running at the higher frequency both on 12V and 24V Berd-Airs.

I think it might by a typo because it sure looks like a delay "before" probing when I watch it.

Have you tried adding the R parameter to M558? I'm using a .9 second delay to let settle between moves.

M558 P5 I1 R0.9 F360 T1000 A3

I home to max and then probe the bed at the start of the print. I'm using a Precision Piezo20 for the probing.

Relevant parts of my startup gcode
G28 ; home
G1 X200 Y200 Z5 ; Move close to center of the bed

M109 S160 ; set the hotend temperature for probing and wait

G30 ; Simple probe of the bed to set 0 and squish any drool
G30 ; do it again rule out any squish
G29 S1 ; Load the bed height map

My Config

; Configuration file for Duet WiFi (firmware version 1.20 or newer)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool on Sat Feb 17 2018 18:30:50 GMT-0500 (EST)

; General preferences
M111 S0 ; Debugging off
G21 ; Work in millimetres
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
M555 P1 ; Set firmware compatibility to look like RepRapFirmare

; Network
M550 PCoreXY ; 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

M667 S1 ; Select CoreXY mode
M208 X0 Y0 Z-5 S1 ; Set axis minima
M208 X400 Y400 Z444 S0 ; Set axis maxima

; Endstops
M574 X1 Y2 Z2 S0 ; Set active low endstops

; Z Probe
M558 P5 I1 R0.9 F360 T1000 A3 ; Set Z probe type to switch and the dive height + speeds
G31 X0 Y0 Z-0.15 P600 ; Set Z probe trigger value, offset and trigger height

; Define mesh grid
M557 X40:360 Y40:360 S32

; Drives
M569 P0 S0 ; Drive 0 goes backwards
M569 P1 S0 ; Drive 1 goes backwards
M569 P2 S0 ; Drive 2 goes backwards
M569 P3 S1 ; Drive 3 goes forwards
M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
M92 X80 Y80 Z1600 E838 ; Set steps per mm // 1.8 stepper 419
M566 X500 Y500 Z12 E1200 ; Set maximum instantaneous speed changes (mm/min)
M203 X18000 Y18000 Z1250 E3600 ; Set maximum speeds (mm/min)
M201 X1600 Y1600 Z300 E1500 ; Set accelerations (mm/s^2)
M906 X1480 Y1480 Z1500 E1200 I15 ; Set motor currents (mA) and motor idle factor in percent (1.8 stepper extruder E600)
M84 S30 ; Set idle timeout

; Heated Bed
M307 H0 A202.0 C457.0 D1.6 S0.80 V24.0 B0 ; PID settings
M305 P0 T99904 B3932 C8.791829e-8 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S140 ; Set temperature limit for heater 0 to 140C

; Hotend
M307 H1 A472.5 C292.1 D5.2 S0.95 V24.0 B0 ; PID settings
M305 P1 X200 ; Use RTD 0
M143 H1 S280 ; Set temperature limit for heater 1 to 280C
M207 S0.80 F2400 Z0.30 ; Firmware retraction .8mm, 40 mm/s, z hop of 0.30

; 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

; Fans
M106 P0 S0 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
;M106 P1 S255 I0 F20 H1 T55 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P1 S255 I0 F500 H1 T55 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P2 S0 I0 F500 H-1 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned off

; Load the bed mapping file automatically
G29 S1

; Automatic saving after power loss is not enabled

; Custom settings are not configured
M912 P0 S-7.1 ; Offset CPU temperature

T0 ; Select Extruder

I measured max current with the pump outlet blocked at full power and they were within safe limits. These are low cost motors, so I always check them before I use them. Not sure of what equipment you have, but at a minimum, you can check current draw with most multi-meters to ensure you don't have a junk motor that would cause damage.

I agree with dc42's recommendation to use the surge-limiting thermistor for protection. It's inexpensive insurance.

I'm using the Berd-Air on a 0.85 Duet and a 1.03 Duet Wifi without use of the eSwitch module. The Duets are rated to handle the current of the 12V and 24V pumps with direct wiring.

I installed the flyback at the motor endbell for both installs. The 1.03 Duet Wifi does really need it, but I added it anyway.

I've got 100's of hours on both boards with the Berd-Air wired directly. The 0.85 is passively cooled, and the Duet Wifi is actively cooled because I'm running the stepper drivers at about 1.7 amps.

Thank you!