Delta inverter E ground wire:
(1) Neutral wire. The neutral wire is the center line of the generator output. Regardless of whether it is at zero potential on the client side, the neutral wire must never be used as a ground wire connected to the E terminal of the inverter!
(2) The N terminal of the inverter. The N terminal of the inverter is the negative end of the DC bus inside the inverter, and should be connected to the brake module. It must not be used as a grounding terminal, nor can it be incorrectly connected to the power supply's neutral wire.
(3) Safety ground. The E ground wire of the Delta inverter should be connected to the safety ground, which is the motor housing. This prevents high-voltage surge impacts and noise interference.