F16,8,4,1 ac voltage out of tolerence
Fault occurs when incoming ac line voltage deviates by more than +15% or-20% of level specified in parameter 617 "rated ac line" for a period of time greater than parameter 728 "ac line tol dly"

I had some similar problems recently and it took the motor to finally blow before i found the problem. Every thing pointed to the drive so i changed the appropiate boards and it did zilch . I had a old armor machine and the com blew out of the end . Have you gone through the isolation tranfomer yet ? I would routine the iso transformer and check the disconect make sure every thing is tight . The miprom checks the resistance before every run and if it thinks it needs more current it will load the motor with a Crap load of current while running causing similar faults too what your getting .