How to Tune udcmin on ZombieVerter VCU

Minimum DC voltage. Power is reduced below this.

Quick Reference

Param ID

Unit

Range

0 — 1000

Default

450

Minimum DC voltage. Power is reduced below this.

Default value: 450

Valid range: 0 to 1000

Leaf Gen1/2/3 280

GS450H 280

GS300H 280

Outlander 280

Rear Outlander 280

Prius Gen3 200

Start with the default value and adjust in small increments. Monitor vehicle behavior after each change before making further adjustments.

⚠️ **MUST BE > 0!** If udcmin is 0 (default), the VCU derates throttle because it thinks voltage is too low.

For 400V pack: start at 300-350V.

For bench testing: set to 20V.

Prevents battery over-discharge under hard acceleration.

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Other parameters in the Battery & HV category that work together with udcmin:

Maximum DC voltage during regen. Set to your pack's max charge voltage.

Maximum DC current draw (acceleration). Set to battery's max discharge rating.

Maximum DC regen current. Must be NEGATIVE for regen to work!

Maximum heatsink temperature before power reduction.

Maximum motor temperature before power reduction.