This was the same exact problem I was having. If you get the overcurrent code you should hear the main contactor click closed and then open again. It closes, senses too much current and the opens again. In my case it’s easy to distinguish the precharge relay click and the main contactor click.

If ...

I’m using a 12v battery for low voltage.

Damien refunded me and told me to contact Johannes to buy a board. Johannes said I should try to get the board I already have working as he is weeks away from having any available and told me to post here.

I would be happy to send the board back if it’s ...

Hi everyone. Upon the advise of Johannes I'm starting a separate thread here.

I've had a few different issues with getting my board to work and the results were scattered in the LDU support thread. I'm going to consolidate what has happened so far since I got the board and hopefully someone can ...

If you follow other posts you will see there was a temp sensor errors with MUX. There was an open task created and Johannes posted revised versions that fix that problem. The actual heatsink temp is 23c. Besides that the other versions fix the issue, you can graph the temp on this version and see it ...

I set ocurlim to -2500 and il1 and il2 to -1. My contactor will flip without overcurrent but it doesn't change runability.

I changed udcnom to 0 and boost to 1000. The inverter will make a quiet whine when put in drive or reverse but the motor will not spin. This has been the case in all parameter ...

I swapped a and b. In the stock and swapped positions everything acted the same.

I loaded the parameter file and the motor won’t turn at all. (If I change the udcnom it will run very slow and very jerky)

I have the encode mode now in AB in every setting I try.

Ok I double checked all the parameters and switched my encoder to AB instead of single.

Also the ilgain I think is accurate, if I change it to -1 it reads a positive number when it should read 0 (before the start signal happens). Maybe the multiplier changed with new software/hardware versions ...

Gotcha. I will try to change the encoder. I have written down that you had it at 0 and my built board came with 0, that's why I didn't try changing it yet.

I did play with fmin, at the value the board came with, it would not start the motor. I'll try it with slightly higher settings.

I see what ...

Here are the last set of parameters I tried. They worked in all versions the first test and ran the motor correctly in V4.79. Now the main contactor won't close in 4.79 and 4.56, the motor will spin in 4.76 and 4.71 but the throttle hangs on even when the pedal is released.

I did some testing today and got some strange results.

Since I've been trying different software versions and different parameters, I decided to start from scratch and get a baseline for comparison.

The version my board came with was 4.71. With the stock parameters the motor would not spin. With ...

I checked that yesterday actually, and the mode still reads off even though the start signal is received according to the graph.

I think my issue has one more difference than yours. When I hit the start signal my precharge relay does not open and thus I don’t think my inverter starts.

I tried this, the error is gone but the main contactor still will not close when the start signal is sent.

I can still graph and show the start signal reaching the board.

I got it and tried it. Below is what I posted in that thread. I'll add it here for LDU users following this thread-


I just tested this verison-

1. The temp codes are gone and the graph reading looks normal!

2. One spot value changed from OK to ERROR- din_mprot. I tried my starter switch and even ...

I just tested this verison-

1. The temp codes are gone and the graph reading looks normal!

2. One spot value changed from OK to ERROR- din_mprot. I tried my starter switch and even though I could see the signal incoming on a graph, the control board would not close the main relay. I went back to ...

I have some updates-

1. I soldered the current input 5V connection and now have equal voltage on all test points and no more maxcurrent stop code.

2. I tested continuity between every pin on connector 10 and the corresponding devices on the schematic. No bad solder joints, everything checks out ...

The throttle programming procedure documented is a little misleading. You don’t look at potnom to do it.

You look at pot in the spot value menu when the pedal is at resting position for the potmin number, then push the pedal and hold on full throttle and refresh the web interface to get the ...

I believe the pad is still connected and the solder joint is broken, but I will take a close look today and confirm. Here are photos of the exact errors I’m getting even when jumpering the bad connection.

For the temp, I can see it toggle between 100C (maxed out) and 23C (actual temp) so I’m ...

I figured out the issue.

After testing the current sensor A circuit I discovered pin 2 on harness 13 does not have 5V.

For proof of concept, I jumpered pin 10 on harness 15 that provides 5V for current sensor B to pin 2 and all the values on the test points for the current sensors were equal and ...

Looking at the schematic and pcb layout here are my thoughts-

The signal from each current sensor comes in connector 13 to IC13
Then the signals are sent to the current filter section to IC11
Both IC13 and IC11 are mirror devices, as in they have a common 5v and gnd and they run an A circuit on one ...

There are two smaller tabs on the bottom that ground to the case cover when it’s put back on. There is a longer tab on top that attaches to the inverter via a allen head machine screw. The top tab connector is attached to the inverter.

1. The “shielded” cable is not shielded. I ran out of 2 OT wire terminals and Autozone only had a 2 gauge terminal so that’s positive wire that wouldnt fit in the terminal. I thought it would be fine for testing since the amp draw is much lower.

2. I used the wiring diagrams in the beginning of ...

Here is a short video of the setup
https://youtu.be/edYsatykm30
Please ignore the sloppy wiring, I left everything long for going in the vehicle.


I checked and all my connections are good. O ohMs from the 12v battery grounds to the wires that go in the 23 connector.

Attached is a hdr photo of ...

I’ve completed the testing and here are my results-

Ignition on (no hv, no start signal)-
Test point #45 = 1.76vdc
Test point #58 = .202vdc
error codes-
Pwmstuck
Hicurofs1
Tmphmax

Ignition on, start signal no hv-
Error codes-
Tmphmax
Current limit
This time (for the first time) it didn’t trip the ...

Thanks for the information. I will test the points on the board, test the switching without HV and let the forum know the results.

In the future I would be willing to make a comprehensive user and install manual pdf once I become more expert on all the features of the controller.