Hi, 

Iam trying to id motor data, in g120c vfd i connected 2 motors 

And controlling them with 1 vfd, i need to id them, i set p 1900 -2 

And try to find i encountered with error f7990 please kindly guide me what to do

------------------------------------------------------------------------------------------
Split from ERROR 7990: drive incorrect motor data identification (103).

Are the motors mechanically stiff coupled? If not, V/f mode would be the best, but then a MotID isn´t so important (in my opinion senseless). 
Maybe you can do a test to do a MotID only with one motor (so configure only one motor in the motordata´s) and then parametrize p306=2.