Thanks Dave. I'll get this in the board. Should have the V50 ready for tests this week. So far I once accidently (and once on purpose) shorted two phases with a screwdriver during low voltage bench tests. Trips off the inverter and restarts no problem.

I prefer that this information not become open source.


Ok. No problem. As I said before well done getting to where you need to be and I hope it works out and does what you need. The main focus of this thread is currently the replacement PCB project that I'm currently "leading" and the ...

First off congratulations. I understand how it feels to see a motor turn after a long process of work. You are free to do with the information as you see fit. I know the broad strokes myself but i'm sure there are hundreds of details to work out along the way. The solution I'm pursuing is a ...

Thats excellent Dave. Thanks. I've been cleaning up the board and getting ready to order V2. By the time it arrives I'll have the Volvo V50 test mule in the barn and ready for full up tests.

Do you intend sharing your findings / project?

For those interested current V2 board schematic. Not finalised yet but has corrections from V1 and now all component values and types populated. Basically the current board minus the bodges:)

Just a model 3 inverter with an OI board running a model 3 motor.... nothing interesting:)

Little busy

Sorry for the late update folks. Been down with a stomach bug. But hey , its been 5 years so whats another week. Anyway, before running any real power through the inverter I decided to scope the gate-source waveforms just in case. High sides looked fie but all THREE lowsides showed this sort of a ...

Sadly not. Now with SD set properly as soon as pwm hits they drivers they go into fault.

Thanks Dave will give a shot tomorrow. Yeah I recall the gaps in the spi when under pwm from when I ran the modboard. Didnt seem to cause any problems.

Capture with pwm on.

Okay. 5 sec delay between power on and starting spi coms. No errors.
PWM reaches the drivers but is not passed through.
also set the analyser to CPHA=1.

SPI clock at divide by 32. Roughly 2MHz now. Same behaviour.

Thanks Dave. Will try tomorrow.

Capture attached. Funny. Am going roofing myself:) Thanks Dave.

Well, good news is red light stays out and pwm reaches the drivers but they are not happy. Guess I'll have to go in and see whats annoying them. In related news the variant detection is really messed up and needs to be forced to M3 but thats a small matter.

Yeah my initial modboard just ran them in default config as didnt have the spi worked out at that point. Sadly the good luck streak has finally ended. All the drivers fault as soon as pwm is applied. No doubt some error in the HW reverse engineering. I'll get spi coms running to try and narrow it ...

Sorry Dave I should have said the gate psu is on and I just strobbed SD.

All gate drivers powered up, reset and waiting for spi configuration to be loaded.

Welcome to the forum.

I'll see if I can get my hands on a front inverter. I did attempt to contact the German guy. So far no reply.