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TMS320F28035: TMDSSOLARUINVKIT Under voltage grid fault

Part Number: TMS320F28035

Hi, TI

I try to use TMDSSOLARUINVKIT through the quick start guide and GUI, and everything worked fine on first use. However, when I use GUI for the second time and it shows fault as follow:

I use an 600W 220V/50Hz external AC source to emulate grid, 35V DC power supply as input. My question is how to deal with this fault.