Motor phase may be disconnected

Krohm Koala

Hi, i just got a duet wifi from a friend (it's an original), it always got the driver 1 not working. When trying to move it, i got the phase disconnected, for both move direction so i looked at the board, nothing seem wrong, i tested the continuity between all component, it seem fine, so, is the driver is dead ? Or it can be something else ?

Danal

Does the exact same motor/cable work on other drivers?

Krohm Koala

@Danal yes, of course, was to logic that I forgot to mention it

Danal

Then it is pretty clear that driver 1 is dead. That's fairly easy to work around with Duet configuration.

A Former User

Just put P1 R-1 in your M569 command to supress the errors and use the other drivers if you only need the 4 (or replace it, there isn't a thermal pad under the qpf44 chips, but you'll still need some serious preheating to the board due to the heavy ground planes and 2oz copper).

https://duet3d.dozuki.com/Wiki/Gcode#Section_M569_Set_motor_driver_direction_enable_polarity_and_step_pulse_timing

dc42

@Krohm-Koala said in Motor phase may be disconnected:

Hi, i just got a duet wifi from a friend (it's an original), it always got the driver 1 not working. When trying to move it, i got the phase disconnected, for both move direction so i looked at the board, nothing seem wrong, i tested the continuity between all component, it seem fine, so, is the driver is dead ? Or it can be something else ?

If it only ever reports that error on one phase, most likely it's a bad connection. Usually a bad crimp in the cable, but it could also be that one of the 4 pins of the motor connector on the Duet isn't properly soldered, or even that one of the pins on the chip isn't properly soldered (but this is rare).

If it reports both phases disconnected, this may be because you are trying to move the motor too fast, given its inductance and the VIN voltage.

Krohm Koala

@dc42 it report that both phases are disconnected, I checked the solder and they are great, the crips are good, i used a e3d factory cable with dupont end, it work perfectly on other drivers, at the same speed etc, i also tried to resolder chip pins as i can (not really well equip) everything seems fine maybe i'll try to recheck if everything is good...

dc42

@Krohm-Koala said in Motor phase may be disconnected:

@dc42 it report that both phases are disconnected, I checked the solder and they are great, the crips are good, i used a e3d factory cable with dupont end, it work perfectly on other drivers, at the same speed etc, i also tried to resolder chip pins as i can (not really well equip) everything seems fine maybe i'll try to recheck if everything is good...

Are you using the same M569 settings for that driver number as for the other one that works with the same motor?

Krohm Koala

@dc42 I used basically the same M569 command, i tried putting it on S0 or S1 nothing, i haven't put another parameter. Also i seen that, when i try to move the motor after an M84 for example, the motor seem to have a bit of signal, as it want to spin but can't

dc42

@Krohm-Koala said in Motor phase may be disconnected:

@dc42 I used basically the same M569 command, i tried putting it on S0 or S1 nothing, i haven't put another parameter.

You can send M569 P0, M569 P1 etc. to report the settings of each driver. Use that to check that they are the same except perhaps for S0/S1.

Also i seen that, when i try to move the motor after an M84 for example, the motor seem to have a bit of signal, as it want to spin but can't

Do you mean that when you try to move the motor by hand it seems stiff, compared to other motors??

Krohm Koala

@dc42 So i tested when you give me, it reports exactly the same settings, and yes, whenever the motor is supposed to be powered or not, it's way stiffer than when other motors are not powered, but nothing change as it's supposed to be powered, just a little jerky movement (really little) but nothing else

dc42

@Krohm-Koala said in Motor phase may be disconnected:

@dc42 So i tested when you give me, it reports exactly the same settings, and yes, whenever the motor is supposed to be powered or not, it's way stiffer than when other motors are not powered, but nothing change as it's supposed to be powered, just a little jerky movement (really little) but nothing else

Thanks, it sounds like a faulty driver then. If your Duet is still under warranty, you can ask for it to be replaced.

Krohm Koala

@dc42 not under warranty and got it from a friend, so i don't cause much of a problem for the use i'm going to do, but if i cant try something, i wanted to know if there's something, thanks for your time !