Dear Carol,
Regarding the “invalid data column reference” error, a similar question has been asked and answered in the following forum topic: Crunch error.
Yes, time is the first column and Wind1VelX is the second column in your example OpenFAST output file.
I’m not sure I understand your last question, but the channel numbers specified in the Crunch input file should match those of the OpenFAST output file. So, if you need to use the data in column 30, you should reference C30 in your Crunch input file.
Best regards,