Check the windings of the motor at the VFD output. Start by killing power to the VFD. Next, check for voltage on L1, L2 & L3 and U, V & W line to line & line to ground. If all indicate zero, connect an ohm meter from U to V, then V to W and finally W to U. You should see a very low resistance - single digit ohms. They should all be the same value. If that check so out, test from ground to: U, then to V and finally W. This should indicate a very high resistance - 1 meg ohm or more. Do NOT attempt to use a megger to measure ground to U Vand W while connected to the VFD terminals! Low numbers indicate that the insulation on the windings inside the motor are breaking down, and some current is flowing in the ground wire which is dangerous. If all these checks are ok, the likelihood of the motor being to problem is minimal. You should be able to start / run the motor without damage to it at full line voltage - assuming it can start the load at full speed - and that the load can be safely started at full speed. If no to those questions - you should decouple the motor from the load before proceeding. Next, try running the motor "across the line". Many VFD provide such an option and call this "bypass mode" or sometimes "Manual"
Doing this will cause the motor to appear across the *full line voltage* and the motor will attempt to come up to 100% speed *as fast* as it possibly can. If the motor starts & runs, the issue is related to the VFD itself. You may have a loose control wiring, open input / output fuses, etc.
Review the manual with your options, here