1. Check the wiring of the UVW terminal and the grounding of the shielding layer <br>2. Check the high-voltage input line and the junction box <br>3. Check whether the low-voltage plug-in is fixed in good condition <br>4. Check the grounding wire of the motor controller <br>5. Check the connection of the cooling water pipe <br>1. The UVW terminal wiring is firm, No looseness; the grounding resistance of the motor controller shell is less than 0.01Ω.
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