Little Monster -s hort to ground
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@phaedrux Thank you. Those were the original values with the Smoothieboard that came with this machine. It was scary fast and loud, but the prints were excellent and reliable. I have since been reducing those values and seeing some promising results.
Can you elaborate and what constitutes a hiccups and underruns.
I am using 32x interpolated. 0.9 degree steppers.
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@infamous_panda said in Little Monster -s hort to ground:
@phaedrux Thank you. Those were the original values with the Smoothieboard that came with this machine. It was scary fast and loud, but the prints were excellent and reliable. I have since been reducing those values and seeing some promising results.
Can you elaborate and what constitutes a hiccups and underruns.
I am using 32x interpolated. 0.9 degree steppers.
Those speeds might be doable but you might need to make a change to your microstepping. Interpolation to 256x microstepping only occurs when using base 16x microstepping.
So definitely try switching to 16x. Be careful of your steps per mm setting. Make sure it is calculated for 16x.
This would have the benefit of mqking the motors quieter and will reduce your peak step rate. Which in turn should reduce the hiccups and underruns. DC42 would have to give you the details on what exactly those values mean but in general it would indicate potentially missed steps.
It may be helpful to post your config.g
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@phaedrux I'll give 16X another try. My understanding with the Maestro was that interpolation was supported at 32x. Updated config below:
; Configuration file for Duet Maestro (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool on Fri Aug 03 2018 14:48:09 GMT-0400 (Eastern Daylight Time); General preferences
;*** The homed height is deliberately set too high in the following - you will adjust it during calibration.
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
M555 P1 ; Set firmware compatibility to look like RepRapFirmare
M665 R157.0741 L397.19 B157 H525 ; Set delta radius, diagonal rod length, printable radius and homed height
M666 X0 Y0 Z0 ; Put your endstop adjustments here, or let auto calibration find them; Network
M550 PTEVO LITTLE MONSTER ; Set machine name
M552 P192.168.1.170 S1 ; Enable network and set IP address
M553 P255.255.255.0 ; Set netmask
M554 P192.168.1.254 ; Set gateway
M586 P0 S1 ; Enable HTTP
M586 P1 S1 ; Enable FTP
M586 P2 S0 ; Disable Telnet; Drives
M569 P0 S0 ; Drive 0 goes forwards
M569 P1 S0 ; Drive 1 goes forwards
M569 P2 S0 ; Drive 2 goes forwards
M569 P4 S0
M569 P3 S1 ; Drive 3 goes forwards
M350 X16 Y16 Z16 E16 I0 ; Configure microstepping with interpolation
M92 X160 Y160 Z160 E400 ; Set steps per mm
M566 X1200 Y1200 Z1200 E1200 ; Set maximum instantaneous speed changes (mm/min)
M203 X18000 Y18000 Z18000 E1200 ; Set maximum speeds (mm/min)
M201 X1000 Y1000 Z1000 E1000 ; Set accelerations (mm/s^2)
M906 X1050 Y1050 Z1050 E1050 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout; Axis Limits
M208 Z0 S1 ; Set minimum Z; Endstops
M574 X2 Y2 Z2 S1 ; Set active high endstops; Z-Probe
M307 H3 A-1 C-1 D-1 ; Disable heater on PWM channel for BLTouch
M558 P9 H5 F120 T7200 ; Set Z probe type to bltouch and the dive height + speeds
G31 P25 X0 Y20 Z1.9 ; Set Z probe trigger value, offset and trigger height
M557 R157 S45 ; Define mesh grid; Heaters
M307 H0 B0 S1.00 ; Disable bang-bang mode for the bed heater and set PWM limit
M305 P0 T100000 B4138 C0 R2200 ; Set thermistor + ADC parameters for heater 0
M143 H0 S120 ; Set temperature limit for heater 0 to 120C
M305 P1 T100000 B4138 C0 R2200 ; Set thermistor + ADC parameters for heater 1
M143 H1 S285 ; Set temperature limit for heater 1 to 285C; Fans
M106 P0 S1 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 T45 H1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P2 S1 I0 H-1 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned off; 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; Automatic saving after power loss is not enabled
; Custom settings are not configured
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@infamous_panda said in Little Monster -s hort to ground:
My understanding with the Maestro was that interpolation was supported at 32x.
Ah yes, you are correct. The TMC2224 apparently do support interpolation from any stepping to 256. I wasn't aware of that. I so still wonder about stepping rates at 32x at high speeds. I don't know what the steprate comparison would be between the Duet2 and Maestro.
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@infamous_panda said in Little Monster -s hort to ground:
M350 X16 Y16 Z16 E16 I0
You'll need I1 to enable interpolation.
https://duet3d.dozuki.com/Wiki/GCode#Section_M350_Set_microstepping_mode
You could also experiment with S2 and S3 to switch between spread cycle and stealth chop respectively.
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@phaedrux Yeah, I did have those turned on at one point or another. Right now I'm just shooting for "working". I can hold off on microstepping and interpolation.
32 was just a carry over from my old board and really with 0.9 deg steppers it's overkill for my needs. I want reliability, speed, and accuracy in that order. Surface finish and resolution are not too important.
I think I am getting somewhere setting the machine at 1050mA and lowering the speeds. Which is a bit of a bummer but at least it's way quieter.
What I suspect is that the short to ground error is being misreported. I mean a short should be present or not and immediately apparent once the motors are energized. Not happen minutes or hours into a print. Apologies if this shows a lack of electrical engineering knowledge.
It really needs to be a feature for the Duet to stop a print once a short-to-ground occurs AUTOMATICALLY. Because on a DELTA if you are not watching closely, the remaining axis motors will start flailing around and crashing into things. I suppose this can go on for hours causing real damage. It's been a real PIA working on this problem because I have to be present for the duration of any test.
Sorry Ranting.
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@infamous_panda said in Little Monster -s hort to ground:
I can hold off on microstepping and interpolation.
I Wouldn't hold off on interpolation. I think it's generally a good idea because of how smooth it makes the motors run.
What is the rated current of your motors? Generally setting the drivers to 80-85% of rated is recommended provided cooling is adequate. In your case that may mean at least guaranteeing some air flow over the bottom of the board. Perhaps you already are.
I'm not an electrical engineer either, so I can't speak to the short to ground state. But I'm going on the premise that eliminating any other factors will either cure the symptom or narrow down the problem.
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@phaedrux Thanks man, Giving up for now. M3D has agreed to look at the board.
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@infamous_panda said in Little Monster -s hort to ground:
I think I am getting somewhere setting the machine at 1050mA and lowering the speeds. Which is a bit of a bummer but at least it's way quieter.
I have found that stealthchop mode is way noisier at high speeds. Switching to spread cycle mode makes it much quieter at high speeds. In either mode, both types of motors I tried are silent at rest and quiet at low speeds.
What I suspect is that the short to ground error is being misreported. I mean a short should be present or not and immediately apparent once the motors are energized. Not happen minutes or hours into a print.
Exactly. But as the fault only shows up after some time, I suspect it is temperature-related. The chip evidently thinks there is a short to ground or over temperature situation, because it is shutting off the output, causing steps to be lost.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
@rafb
Here my Duet Wifi files.
I had to cut the bridge on my BL touch for 3.3V.
https://www.thingiverse.com/thing:3052203/files -
Perhaps the temperature sensing function is buggy on the Maestro since it does not show anything on M122? However your test did report the temperature error, did it also turn off the motor or report short to ground?
Something to note, during my first few power ups I had the default speeds copied from my smoothieboard (very high) and the current set to 1.5. The board would report short to ground on all axis the second I tried to home.
So the maestro is stated to support 1.6 amp but apparently this is still under testing? If I have to go below 1 amp for reliability how much should I expect to decrease speeds when compared to my smoothieboard running at 1.8 amps?
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@autsch So it looks like you are running the machine as fast as you were when it was stock?
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@infamous_panda said in Little Monster -s hort to ground:
Perhaps the temperature sensing function is buggy on the Maestro since it does not show anything on M122? However your test did report the temperature error, did it also turn off the motor or report short to ground?
In my tests, the over-temperature warning was reported by M122, but not to the console as popup warning messages. I have found the cause for that and I am working on a 2.02beta2 release. I didn't let the drives get hot enough to give over-temperature shutdown.
Something to note, during my first few power ups I had the default speeds copied from my smoothieboard (very high) and the current set to 1.5. The board would report short to ground on all axis the second I tried to home.
That's interesting! I think this is either an issue with using stealthChop mode at high speeds (which Trinamic says on the data sheet may not work well), or else your motor cable capacitance is very high and the blanking time parameter in the chopper control register needs to be increased because of that. Have you tried using spreadcycle mode? To select it on driver 0, send M569 P0 D2. Repeat for P1...P4. With the motors that I tested with, it was quiet at all speeds; but I am aware that spread cycle mode can be noisier than stealthchop with some types of motor.
If that doesn't help then I can give you the chopper control register values to increase the blanking time.
So the maestro is stated to support 1.6 amp but apparently this is still under testing? If I have to go below 1 amp for reliability how much should I expect to decrease speeds when compared to my smoothieboard running at 1.8 amps?
The firmware limit and design goal is 1.6A. My tests indicate that 1.0A on 4 drivers works without any cooling at all, and 1.4A works with minimal fan cooling. With a properly-designed enclosure with a fan that blows air along both top and bottom of the Duet, I think 1.6A should be achievable.
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@infamous_panda
I dont care about speed
My next mods are Plexi Cover, 0.9 degree steppers, smart effector with mag balls, linear rails and a flexi drive direct Extruder.
I allready have the parts, but it takes time...
