Node 10 Sage Continues.
Since I have had quite a bit of down time while I wait for me replacement board, I spent a little time looking at both node 10 boards that have fried and also compared to others who have posted images. It is definitely frying on the chip labeled TMC5041-LA on the bottom left of the board, above CN3 and it is frying in pin positions 31 "GNDA" and 30 "VSA". According to the manufacture of the chip they provide advice regarding how to protect against ESD events. The following is from the manufactures website.
https://www.digikey.com/htmldatasheets/production/1783477/0/0/1/tmc5041-datasheet.html?utm_adgroup=xGeneral&utm_source=google&utm_medium=cpc&utm_campaign=Dynamic%20Search_EN_Product&utm_term=&utm_content=xGeneral&gclid=EAIaIQobChMI1-yXgpqa-QIVlIjICh0c0wkYEAAYASAAEgJlKvD_BwE
3.5Driver Protection and EME Circuitry
Some applications have to cope with ESD events caused by motor operation or external influence. Despite ESD circuitry within the driver chips, ESD events occurring during operation can cause a reset or even a destruction of the motor driver, depending on their energy. Especially plastic housings and belt drive systems tend to cause ESD events. It is best practice to avoid ESD events by attaching all conductive parts, especially the motors themselves to PCB ground, or to apply electrically conductive plastic parts. In addition, the driver can be protected up to a certain degree against ESD events or live plugging / pulling the motor, which also causes high voltages and high currents into the motor connector terminals. A simple scheme uses capacitors at the driver outputs to reduce the dV/dt caused by SD events. Larger capacitors will bring more benefit concerning ESD suppression, but cause additional current flow in each chopper cycle, and thus increase driver power dissipation, especially at high supply voltages. The values shown are example values – they might be varied between 100pF and 1nF. The capacitors also dampen high frequency noise injected from digital parts of the circuit and thus reduce electromagnetic emission. A more elaborate scheme uses LC filters to de-couple the driver outputs from the motor connector. Varistors in between of the coil terminals eliminate coil overvoltage caused by live plugging. Optionally protect all outputs by a varistor against ESD voltage.
It's interesting how they refer to belt drive systems. Is there a possibility that certain machines off the line may not be grounded correctly? Maybe a static charge building from the belt and improper grounding of the stepper motor causing the board to fry?
It's been a while since I looked at electric schematics, so if someone out there is a pro, please see what you think. In the mean time, I going to open the hood and take a look at all the cables from the ramp stepper motor to the CN3 connector.
And there's the possibility that I'm 100% wrong.
Fried Node 10 pic 2 (resized).pngNode 10 Chip (resized).PNGnode 10 (resized).jpg