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Tesla SDU drop in board current gains
Posted: Wed Nov 18, 2020 5:01 pm
by Peter
Hi Forum. Do I need to calibrate the current sensors in the latest drop on board? If the answer is ‘yes’ this I assume is with motor cables disconnected. Thanks. Peter
Re: Tesla SDU drop in board current gains
Posted: Wed Nov 18, 2020 5:31 pm
by johu
It comes calibrated, hope you haven't loaded defaults.
Re: Tesla SDU drop in board current gains
Posted: Wed Nov 18, 2020 8:30 pm
by Peter
Hi Johannes. Thank you for your reply and help. Just in the process of re-assembling the inverter so thought to ask first, glad I did

Keep safe. Peter
Re: Tesla SDU drop in board current gains
Posted: Sun Dec 27, 2020 5:21 am
by Johaljaswant
Both contactor close first one on power on and second one at start signal.
With or without Hv Derate error current limit and also error throttle1.
But could be the possible reason.
Attached screenshot
Re: Tesla SDU drop in board current gains
Posted: Mon Dec 28, 2020 12:55 am
by Johaljaswant
Throttle1 issue is solve wiring problem.
Motor spin but still have currentlimit error.
Please advice any clue.
Thanks
Re: Tesla SDU drop in board current gains
Posted: Mon Dec 28, 2020 12:22 pm
by johu
Using latest firmware? 4.96.R
Re: Tesla SDU drop in board current gains [SOLVED]
Posted: Mon Dec 28, 2020 9:32 pm
by Johaljaswant
I update firmware and it’s work no more currentlimit error.
Thank you and Damien so much for providing great option for
EV conversions
I am average guy with basic knowledge but I done two conversion with yours logic boards And support
One with Tesla LDU and one with Tesla SDU.
Again thank you!
Re: Tesla SDU drop in board current gains
Posted: Tue Dec 29, 2020 9:04 am
by johu
That's what we want, very nice

Re: Tesla SDU drop in board current gains
Posted: Tue Mar 02, 2021 11:35 pm
by Johaljaswant
1.Main contactor close at only UDCSW =0 while battery voltage is 365 V. If I put UDCSW =10 contactor does not close.
2. Tesla SDU Motor spin very fast when pedal just engaged . Pedal signal voltage is Fine 0.7 v to 3.8 v. So pedal does control speed.
Re: Tesla SDU drop in board current gains
Posted: Tue Mar 02, 2021 11:41 pm
by Johaljaswant
Re: Tesla SDU drop in board current gains
Posted: Wed Mar 03, 2021 8:27 am
by johu
Can you set udcnom=0 just to check.
Something is probably not right with your bus voltage measurement or precharge circuit
Re: Tesla SDU drop in board current gains
Posted: Wed Mar 03, 2021 8:08 pm
by Johaljaswant
Did try with UDCNOM =0.
Motor does not spin.
No any error code store.
Main contactor engaged sound is different than before I’did not check precharge relay circuit yet.
Please advice
Thanks
Re: Tesla SDU drop in board current gains
Posted: Thu Mar 04, 2021 9:09 am
by johu
Well, setting udcsw=0 on a HV pack will definitely weld your contactor and it will then sound different to say the least. Sorry I didn't catch that one before.
Re: Tesla SDU drop in board current gains
Posted: Sun Mar 07, 2021 1:07 am
by Johaljaswant
My car pre charge relay was gone. Change the pre charge relay.I test run, wheel up, on idle speed it is fine.
Also with pedal it run but still fast. But controlling the speed with pedal.
How I can make less aggressive .
My car has brake sensor as will. But car get ready Without pressing the brake,
It should be ready while brake on.
Please advice.
Attached parameters
Re: Tesla SDU drop in board current gains
Posted: Sun Mar 07, 2021 9:36 am
by johu
It is hard to control speed with the pedal, as the motor torque is controlled. Once the vehicle is on ground it will make more sense. If I understand correctly you only want the inverter to change to run mode when brake pedal is pressed?
Your parameters look ok but are different from standard. If you want to revert to standard parameters, look here:
https://openinverter.org/parameters/view.html?id=15
Did your main contactor survive switching into a discharged capacitor?
Re: Tesla SDU drop in board current gains
Posted: Sun Mar 07, 2021 2:49 pm
by Johaljaswant
Thank you ,I will try again with standard parameters.
Yes my main contactor survive ,also I confirm with multimeter, And Also sound fine now.
Yes I want my inverter should ready when brake pressed .
Thank you so much!
Re: Tesla SDU drop in board current gains
Posted: Sun Mar 07, 2021 6:24 pm
by mjc506
Johaljaswant wrote: ↑Sun Mar 07, 2021 2:49 pm
Yes I want my inverter should ready when brake pressed .
Thank you so much!
Have the +12v for your 'start' switch come from the brake light switch (assuming switched positive)?
Re: Tesla SDU drop in board current gains
Posted: Mon Mar 08, 2021 1:14 am
by Johaljaswant
Thank you!
I will make change to starting switch accordingly.
Thanks again for reply.