How did you manage to get the hose barb nozzle out? Is it just pressed in?

Hi nubster,
I did it like this: https://openinverter.org/forum/viewtopic.php?p=56088#p56088
Not yet driving so i dont know if it will last.


Oh wow, that's a cool way to do it. So you modded the valve, rotated the pump 180, tapped a new mounting hole, and are only using two of the three bolts ...

I see now that the front SDU oil pump is different than the rear SDU oil pump. The front pump has the intake and output ports on opposite sides, whereas the rear pump has them on the same side. Even if I could modify my pump to work in reverse, I'm not sure there is enough room to route both hoses ...

Hi Peter & ViktorT,

So, did you guys (or anyone else) ever get the external pump integrated and working? Would y'all mind confirming your final approaches and how well they worked? Any gotchas, etc? ViktorT would you be willing to share the STL for that adapter you made?

I'm in the process of ...

added.

FYI, I just published an STL on Thingiverse for 3D printing a replacement SDU MX150 Female Connector. This part is very brittle and tends to break easily. As far as I know, replacements are unavailable, so I decided to make my own. It screws right into the aluminum case, and there is no need for the ...

The oil returns in the bottom opening, where the 3 phase cable go to the motor. If it is upside down the whole chamber of the motor will be filed by oil that cannot drain.
Best is to get the motor and open it to get a better idea of what is going on.


Thanks for the reply. To be clear, my motor ...

Excellent, thanks again!

Is there any way to check if an SDU inverter is good without breaking the 3-phase wire VOID seal? Is there some way to check it via the logic board connector only?

I'd like to be able to test a drive unit at the wrecking yard before taking possession of it, if possible.

I wonder... has anyone actually managed to get an SDU spinning with a V8 board yet?


Just wanted to confirm that yes, I have managed to get an SDU spinning with a V8 board.

Apparently, something is wrong with my original inverter's power electronics, hence all of my issues. I got a new unit ...

Would it be possible to fit a separate/inline pressure regulator and leave the stock pump and pickup as-is? My unit will be mounted right side up, just in reverse. Thanks.

So, it would seem my inverter's power electronics indeed got damaged.

I bought another SDU, took off the inverter, installed the original V8 board I built & programmed myself w/new sensors (the one giving me the weird voltage readings), and put it back on my original SDU, and it's happily spinning ...

No worries. I know you're super busy; thanks for getting back to me.

OK, I used a 470 Ohm resistor to connect the 5V pin of CONN8 (reading 4.9V) to pin 22/FAULTC of CONN5, and I'm measuring 0.255V at the pin. Does this mean it's being forced LOW? Implications?

Sure. @ 14V:

1=0.002V
2=0.289V
3=1.103V
4=1.108V
5=1.102V
6=13.74V
7=4.9V
8=0.811V
9=4.9V
10=13.74V
11=0V
12=4.9V
13=0V
14=3.212V
15-24=0V

Should 15-24 be above 0V? Is that an indication of an issue with the gate driver board?

I uploaded pics of the top of my gate driver board. Not sure if you ...

Don't think this would be a problem but you could try replacing it with a slightly higher value (like 56k). Or stick 330k in parallel to R58


Ok, I ordered a 56k. In the meantime, I measured all 24-pins of the IGBT connector in case it might hint at the issue:

1=0.003V
2=0.295V
3=1.126V
4=1 ...

4.83V seems a little low. I wonder if the 5V rail sits too low. It should be at 5.3V. Can you confirm R56=56k and R58=10k ?


R56=51k
R58=10k

I double-checked C13 again, and the top is now reading 4.9V after restarting my multimeter (and adjusting my power supply to exactly 12V). The supply ...

FWIW, I retested everything with the HV connected but got the same results.

However, after seeing THIS post today, I took a look at C13.

On my V8 board, C13 is populated with a capacitor. I tested it with 12V power enabled, and the top of C13 reads 4.85V, and the bottom reads 0V. Would this ...

I wonder... has anyone actually managed to get an SDU spinning with a V8 board yet?

I'm also getting a persistent OVERCURRENT error when all other tests seem to indicate my inverter is good.

On my V8 board, C13 is populated with a capacitor. I tested it with 12V power enabled, and the top of C13 ...

I wrote up a how-to document here based on my experience from this post .

The process for flashing the STM32 and ESP32/ESP8266 modules should be the same or similar, but if you're trying to reload the Zero EV/Felton software, you'll need to use the corresponding firmware files instead.

You can ...

I assume the gate driver board is the one underneath the logic board that's encapsulated in clear plastic? If so, the only thing I can see are two pads marked G that have a little black around them. The 24-pin IGBT connector looks good to me. Pics here: https://photos.app.goo.gl/j5P5TPSmvoksicUJ8 ...

Here's a video of me performing the tests above: https://photos.app.goo.gl/b4rpCbvxkmJiQU2Q8

I performed the measurements both with and without the HVIL jumper shorted and got the same exact results.


0.6V sounds fine. In the other direction it doesn't go to 0 but to OL, overload :) All good ...

OK, I received the new board from the web shop, installed it with new sensors, and got the same symptoms as before. I.e., Everything seems fine until I press start. opmode says Run for a fraction of a second; then I get OVERCURRENT. udc is showing the correct value.

@johu - Thanks for posting the ...

After loading the correct SDU params, I see the correct udc value, but I still got an OVERCURRENT error when I hit start.

I opened it up and found that I didn't quite trim the current sensor leads all the way down, and a couple were bent over and contacting each other. I trimmed them down to the ...

Oops, sorry, the ones I described in that post are the overall default parameters in the OI code but not the specific parameter defaults for the SDU :(


No worries, man. That's totally on me, and thanks for all the help on that thread! I suppose I just assumed the firmware somehow knew what ...

johu wrote: ↑Sun Jul 16, 2023 4:55 pm These are not Tesla parameters, these are: https://openinverter.org/parameters/view.html?id=15

When flashing the firmware you'll get default parameters very unfit to the SDU

I see. I must have misunderstood the reply in my other post. I will give these a shot. Thank you!!