The motor is over-amping.  Remove power to the VFD, wait 2 minutes and then reinitiate power to the VFD.  While VFD is reinitializing, press the DSPL button on the VFD until the IOUT LED on the VFD  is lit.  As the fan begins to operate, compare the amp draw shown on the display of the VFD with that displayed on the fan’s nameplate.

 

If the value shown on the VFD exceeds the number displayed on the fan’s namplate, confirm that the fan impeller is operating in the correct direction (counter-clockwise).  Refer to Section E and then proceed to Section J-1 through L-1 in the Start-Up and Warranty Activation Guide to alter the direction of the impeller’s rotation, if necessary. Also, verify that all 3 windings of the motor do not return an open Ohm reading.