1. It is strictly forbidden to connect the inverter output terminals U, V, W to the AC power supply. 2. The inverter must be properly grounded, and the grounding resistance must be less than 10Ω. 3. If the inverter has been stored for more than two years, the voltage should be gradually increased by a voltage regulator when it is powered on. If it has been stored for half a year or a year, it should be powered on and run for one day. 4. After the inverter is disconnected from the power supply, it can be maintained after a few minutes. The DC bus voltage (P+, P-) should be below 25V.
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