Zombie UDCSW negative value

[Sjanders]

Hey all,

Currently combining all my parts to test a first motor spin. Previously I tested communication between the Zombie and my Outlander motor, inverter and charger, this all went well for as far as i could test them. After that I calibrated a throttle pedal which i picked up. When testing the motor, inverter and charger I also tested the BMW S-BOX to see if the contactors worked like they should, by setting UDCSW to 0 volt the contactors happily clicked away at the moment they needed to.

Recently I did a Zombie update to 2.20. Now I'm at the point where I want test the motor, but before that, I wanted to make sure that all component were connected and functioning well, so I fired up de Zombie webpage and saw that UDCSW had a value of -20 (negative). I have tired to change this value many times but it keeps reverting back to -20 after I hit refresh. Other parameters gave no problem changing them. I Have tried to change the UDCSW value with and without my components connected. I tried flashing the 2.20 software again this didn't result in what I hoped for.

Even when the UDCSW value is at -20 the Zombie goes into RUN mode when pushing the start button, but at that point I hear no clicking of the contactors (double checked the wiring).

Any one has an idea how to be able to change the value?

Many thanks!
Sander

[Mitchy]

In the Zombie SBOX code, UDCSW is set to the (Battery Voltage - 20) Volts, So no need to set it via the params.
From the GIT history, seems to have been added going into v2.20

https://github.com/damienmaguire/Stm32- ... a44317R300

[tom91]

Yes the UDCsw is now based on your reported battery voltage -20V. Next step would be to have hv or any voltage/number of modules (over 20V) into the Sbox check you UDC values populate and your udcsw updates accordingly.

[Sjanders]

Hi Tom and Mitchy,

Ok, great! Thanks for your ultra fast response

I'll connect some power to the S-BOX and proceed testing. I'll report my findings here.

Cheers

[Sjanders]

Hey,

I've tested everything again, after connecting the S-BOX to CAN 1 instead of CAN 2 and connecting a 30V power supply, UDCSW did show a positive value. At that point it was possible to close the contactors, UDC and UDC2 both show comparable values.

So that all worked out nicely. I have to admit that this new way of setting the UDCSW voltage is a good safety addition!

Cheers and thanks again!
Sander

[tom91]

new way of setting the UDCSW voltage is a good safety addition!

This only works with compatible Shunts. So its a more "clean" way of doing UDCsw makes it nice and dynamic