Bad Vibrations through printer

samlogan87

@Phaedrux they are the LDO 2504AC motors. The specs can be found here. Mine have extended shafts for encoders

https://caribou3d.com/en/stepper-motors/843-18-stepper-motor-ldo-42sth48-2504ac.html

Basically max current is 2.5A, phase resistance is 1.2ohm, inductance is 1.5mH, torque is 55n-cm

Cheers
Sam

mrehorstdmd

@samlogan87 I watched the video. Is it accurate to say that the noise occurs mainly/only when the extruder is near the corner of the bed?

Can you post more photos of the printer, especially the belt layout of the XY mechanism?

samlogan87

@mrehorstdmd unfortunately it has nothing to do with the position on the bed or the belts. If you read a couple of replies above, by changing the f parameter in the M569 for the two motors the problem stops and it is quiet throughout the rest of the print no matter where it is on the bed. I only put a short video up to show how changing the parameter fixes the issue and it seems to only be applied when there is a direction change which is why I think people think it has to do with the area on the bed or the belts.

Cheers
Sam

Phaedrux

From DC42: we know that some motors are unpleasantly noisy with the 1HCL and we have significant improvements in the works for 3.5beta4.

Meanwhile, here are some tips on reducing noise in such cases:

Use a much lower P value than the auto tune suggests, e.g. 1/3 as much. You may have to accept slightly larger error bounds (M569.1 E parameter).
If running firmware 3.5.0beta2 or later, there is a new V parameter in the M569.1 command. A V value of a few hundred may help a lot to allow good speeds even with a lower P value.
Don't use the step function or the auto tune function to tune the P value. Instead, set the axis acceleration (M201) to quite a high value e.g. 5000, and tune using an explicit GCode move with acceleration, steady speed and deceleration segments; for example G91 G1 H2 X40 F12000 (assuming your machine can move at 200mm/sec).
Having selected a P value, re-tune I and especially D.
Re-test at the highest travel speed that you want to use, to make sure that the new P value is sufficient.

dc42

@samlogan87 I would add that the noise/vibration issue referred to by @Phaedrux is specific to closed loop mode. If you are also getting these bad vibrations when you run the motor in open loop mode, then the problem is mechanical.

samlogan87

@Phaedrux i am not running in closed loop at the moment. @dc42 hi David, how would changing a value for the F parameter in my M569 declaration stop the noise all together for the entire rest of the print? It doesn’t matter what I change it to, just that it is changed while printing and the problem disappears

dc42

@samlogan87 the only explanation I can think of for why changing the F parameter would resolve the issue regardless of what you change it to is if the TMC driver register that holds that F value (the chopper control register) is getting corrupted somehow, and rewriting that register restores the correct value. If it was just one of the motors that was affected, then I would suspect a faulty driver chip.

The default value for F is 3. You can read the value in the chopper control register using this command:

M569.2 P#.0 R{0x6c}

replacing # by the CAN address of the board. If you haven't changed that F parameter, and assuming you are using x16 microstepping with interpolation, the value returned should be 0x14008053 if the driver has been enabled. The final digit will change with the F parameter, and will be zero if the drive is disabled (e.g. using M18).

samlogan87

@dc42 hmm interesting, what could be causing that. I did check what the response was when I sent M569 P10.0 and P11.0 and it gave the valve as per what was set

samlogan87

@dc42 Hi David,

I ran what you said plus M569 x.0 without parameters and thats what I got

5/31/2023, 8:03:13 PM	M569.2 P11.0 R{0x6c}
Register 0x6c value 0x14008050
5/31/2023, 8:03:05 PM	M569.2 P10.0 R{0x6c}
Register 0x6c value 0x14008050
5/31/2023, 8:01:47 PM	m569 p11.0
Driver 11.0 runs in reverse, active low enable, mode spreadCycle, ccr 0x0805a, toff 10, tblank 1, thigh 200 (46.9 mm/sec), hstart/hend/hdec 5/0/0, pos 168
5/31/2023, 8:01:42 PM	m569 p10.0
Driver 10.0 runs in reverse, active low enable, mode spreadCycle, ccr 0x0805a, toff 10, tblank 1, thigh 200 (46.9 mm/sec), hstart/hend/hdec 5/0/0, pos 184

And after enabling the drivers, this is what I get

5/31/2023, 8:06:39 PM	M569.2 P11.0 R{0x6c}
Register 0x6c value 0x1400c05a
5/31/2023, 8:06:35 PM	M569.2 P10.0 R{0x6c}
Register 0x6c value 0x1400805a
5/31/2023, 8:06:25 PM	M569 P11.0
Driver 11.0 runs in reverse, active low enable, mode constant off-time, ccr 0x0805a, toff 10, tblank 1, thigh 200 (46.9 mm/sec), pos 424
5/31/2023, 8:06:21 PM	M569 P10.0
Driver 10.0 runs in reverse, active low enable, mode spreadCycle, ccr 0x0805a, toff 10, tblank 1, thigh 200 (46.9 mm/sec), hstart/hend/hdec 5/0/0, pos 248

When they are enabled, they are not the same so not sure if that is anything

Cheers,
Sam

o_lampe

@samlogan87 Just want to mention that the 'ccr value' is 0x0805a for both drivers after enabling, but the registers are different.
Not sure if that has a meaning...

samlogan87

Interesting, I started printing and those values change to the same as the odd one after I homed the axis above.

5/31/2023, 9:36:55 PM	M569.2 P11.0 R{0x6c}
Register 0x6c value 0x1400c05a
5/31/2023, 9:36:49 PM	M569.2 P10.0 R{0x6c}
Register 0x6c value 0x1400c05a
5/31/2023, 9:36:43 PM	Printing paused at X309.3 Y24.4 Z0.2
5/31/2023, 9:36:37 PM	M25
Resume state saved
5/31/2023, 9:35:13 PM	M32 "0:/gcodes/Film Hole Tester Top Piece.gcode"
File 0:/gcodes/Film Hole Tester Top Piece.gcode selected for printing

And when I go back and change the F parameter while I have paused the print, they change to what they were before the print started

5/31/2023, 9:39:39 PM	M569.2 P11.0 R{0x6c}
Register 0x6c value 0x1400805a
5/31/2023, 9:39:34 PM	M569.2 P10.0 R{0x6c}
Register 0x6c value 0x1400805a
5/31/2023, 9:39:24 PM	M569 P11.0 F10
5/31/2023, 9:39:20 PM	M569 P10.0 F10

The printer is not quite and does not resonate/vibrate/annoy the wife

Cheers
Sam

samlogan87

@o_lampe Yeah I am not 100% know what all the registers do but something is going wrong when I start a print

Cheers
Sam

dc42

@samlogan87 if the driver is in spread cycle mode (the default) then the default value of that register should be 0x14008053 when the driver is enabled and 0x14008050 when it is disabled. The lowest 4 bits are the TOFF time when the driver is enabled, so 0x1400805a would be correct if you used M569 with an F parameter of 10.

The value 0x1400c053 would be correct if the driver was put into constant off-time mode using M560 P# D0. I notice that one of your M569 commands did indeed report that the driver was in constant off-time mode:

@samlogan87 said in Bad Vibrations through printer:

Driver 11.0 runs in reverse, active low enable, mode constant off-time, ccr 0x0805a, toff 10, tblank 1, thigh 200 (46.9 mm/sec), pos 424

The driver is put into constant off-time mode using command M569 P# D0 where # is the full address of the driver. Do you have any such commands in your config.g or homing files?

What firmware version do you have on your 1HCL boards? Use M115 B11 and M115 B10 to check.

dc42

PS - what I think is happening is:

You have M569 P10.0 D0 and M569 P11.0 D0 commands somewhere in your homing or config.g files, that are putting the drivers into constantoff-time mode;
Your motors are noisy when operated in constant off-time mode;
I have found a bug in the firmware that causes constant off-time mode to be cancelled (reverting to stealthChop mode) when the M569 F parameter is used.

samlogan87

@dc42 Hi David,

Bugger that was it. I hadn't commented out those lines in my homing files from when I had it set up for closed loop homing and calibration. I will try and see if it makes a difference tonight. In the example homing files you have for the 1HCL board, it has those lines M569 #.0 D0, could I make them D3 I think it is for stealthchop?

They are both running Duet EXP1HCL firmware version 3.5.0-beta.3 (2023-04-14 13:08:48) not that I think it matters anymore

Cheers
Sam

samlogan87

Hey everyone,

Thanks for your help. It has been sorted. I stupidly did not comment out all of my homing files from disabling all of my closed loop stuff.

Cheers
Sam