Tesla Model S/X Small Drive Unit ("SDU")

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The Tesla SDU is used on Model S/X in both rear and front depending on the model.

Front SDU Connectors

Drop-in control board

Tesla SDU drop-in board

This board replaces the original board that comes with the OEM Tesla drive train. As opposed to the latter this board lets you use the drive train in the first place and allows you to fine-tune driving behaviour with the usual set of openinverter parameters. It does not restrict you in power output or regen input.

You can fully control the board via CAN or via a set of digital and analog inputs.

Wiring connections

Pinout

Application Info

The board comes programmed with a recent software version. Please check github for recent software releases. In addition the board comes with a set of parameters appropriate to run the Tesla SDU. So it will work out of the box. Parameters that must not be changed are hidden to eliminate sources of error.

You will need to solder the supplied connectors and the current sensors embedded into the inverter assembly to the board, see this video.

To test run your drive unit, supply the board with 12V and GND on Conn6.13 and Conn6.19, respectively. Also supply 12V to Conn6.5 to select forward direction.

Supply inverter with some high voltage. For first tests it is recommended to put a large resistor/heating element/kettle in series.

You can start in manual mode using the button on the web interface and enter like 1Hz for „Fslipspnt“ and some value between 10-50 for „ampnom“ to see if the motor spins up. Be careful because manual mode does not enforce a motor speed limit!

You may also set parameter „udcsw“ and „udcmin“ to 0 and start drive mode by pulsing 12V on Conn6.9. Then connect a pot between Conn6.4, Conn6.7 and Conn6.8 (wiper). This will also spin the motor AND enforce a speed limit.