OK, so I'm going to start with the important things:
Why do you use a local variable here, when you could just connect everything that is now a variable?
The first for loop seems obsolete to me.
Aaaand, back to your original problem: you're not updating the array. You load the File fresh every iteration, read 2 values from it, insert them into the (very old) system numeric array 2 and write all of that into a tdms file. What you get is a tdms file that is 360 times as big as you originally intended and has 360 datasets with 1 updated row in it. As I suggested befor: Auto indexing is your friend:
Load the file once, pass the array to a for loop, in it convert, as you've already done, pass it out of the for loop (again, enabling auto indexing) and pass the result to the tdms function. If that doesn't work transpose the 2D array before and after. (not sure about the orientation you get from the file)
Other than that I hope you know that there's a boatload of free tutorials out there, which you access to get better acquainted with the old lady we call LabVIEW:
3 Hour Introduction
6 Hour Introduction
LabVEW Basics
Self Paced training for students
Self Paced training beginner to advanced, SSP Required
LabVIEW Wiki on Training
Learning NI
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