The experiment to ease abs over current fault of the Ubox V2

Update: 04-26-2022

Recently, we have received serval reports from our users, that the Ubox V2 is easily to throw out the "Abs over current fault" with FW 5.3. During our designing test, this was not happened, and no reports back from our beta version, so in this time, we are difficult to investigate it.

Some users have a conclusion that Ubox V1 + FW 5.2 is good, and Ubox V2 + FW 5.3 is not. This makes me a little sad, because I had devoted in it with all of my time, cautious and knowledge, and all the lessons from Ubox V1.

Ubox V1 is powerful, but not robust enough. And it did not gives the ADC signals high priority. V2 does, and gives the  ADC signals the shortest route, and a separated ground. It works quit well with FW 5.2 in our testing and by some of our customers, but unfortunately, the Abs over current fault issue happened. Although usually users are made to solve this fault by rise the limiting current, they turn to ask us to provide the 300A FW, but I think this situation deserves a investigation and to make a better solution if we can do.

Recently I'm testing our new 100V single Ubox, I found that the separated ground is may doing negative help.

So I would ask our users to do a trial to merge the ADC (analog) ground to the common ground, as I will figure in below:

Prepares

Ubox V2 with panel removed, a suitable inner hexagon spanner is needed.

A knife to scrape the coating of the PCB.

An iron and solder wire.

Steps

1. Use the knife to Scrape off the coating of the adjacent ground of the PCB, to let the copper of both the ground to be exposed.

Becarefull to avoid to scrape the other traces, pads, and via near them.

2. Use the iron to solder the exposed the copper pads, use the solder wire to bridge the adjacent coppers pads, if make the bridge is difficult, use a copper wire to solder on them to make bridge.

To solder them carefully, make sure the copper pads are well soldered and not shorted the other objects.

3. To check if every thing is back and fine, then re-assembly the panel, and to test if the 'abs over current' fault is eased.

Thank you for give us a help, and please report the results back to us.

PS

One of our customers had said that we are a Jew company, as I want to say, we are more likely a dew company in this hardening age, risks, difficulty and uncertainty are higher and higher. Ubox is undertaken the tasks over its initially designed for, we initially designed to make a V6 grade VESC but with out DRV8301. But our users give it more expectation, this expectation encouraged us and burden us. We will keep going on at this hard time.