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Fault on Hi-drive


I have a new Hi-drive which change a old Hi-drive. 

When i press Emergency STop to off AC 3 phase, after i release Emergency STop and the drive alarm fault "under voltage".

I read manual of Hi-drive which suggest "set b39.0=1" (The automatic reset of “under voltage” undervoltage alarm can be forced by b39.8=1 with any kind of power supply)

but it still alarm fault "under voltage".

The old Hi-drive isn't alarm fault "under voltage" (i set b39.0=1) when i press/realease Emergency STop.

Please help me to solve this problem.

Thank you !!!