ND961800B (need help from the experts...)

[TRS300]

Hi Folks, I bought a Fardriver Controller for $150 on ebay. It was listed as for parts only. The seller was very open about what the problem was but decided to just get a new controller. He even made a video on his efforts to identify the problem.

FROM SELLER ON EBAY....

Bought this controller for a Chopper motorcycle conversion and it was great until I kept getting a "Phase Current Overflow" that I have no clue how to fix. If you know how to fix it here you go...

In the Viedo he mentioned the the yellow V phase seemed to be the one having the issue.

I got the controller in the mail today, put it on the bench and made sure there was no short circuit on the battery in terminals. Looked good so I connected a 48v battery (no issues). With a multi meter I tested between negative to W phase terminal and it read 5mv. It was the 4.8mv on U terminal. The V (yellow) was 36mv. Now 36mv is not much when the unit is charged at 50v. But it's significantly (~7x) higher than the other two terminal readings. And since it was this terminal that reportedly was throwing the high current fault it seems likely that somethings up in the hardware.

Any thoughts on what to look for next. Is it possible to that one of the fets on this phase is leaking through or is slightly damaged?

Please keep in mind these voltage readings on the phases are mv. Not volts. But the yellow phase is different from the other two.

 

[Mattbastard]

I would do a loaded test, then check voltages and amperages at each phase.

And by loaded I mean with at least a spinning motor. I realize how difficult it is to get a meter reading at 30 mph on a bike, but if you're comfortable doing that it's the best way to get data.

 

[TRS300]

I would do a loaded test, then check voltages and amperages at each phase....

I finally figured out how to get connected to the controller and be able to adjust it. And I installed an ABZ encoder on my ME1616. Made it through the self learning process and the motor is operating well from what I can tell. I've not had a chance to operate it under real world load. But I was able to push it while implementing load by using the rear brake while turning the throttle.
I like the idea of recording info while on a test ride but this controller does not have can bus activated and I'm not sure how to gather data from the controller to where I can log it. Which kinda sucks. This is the first time messing with a Fardriver controller and it's not being as easy as I expected it to be.