Thank u very much for the reply ..... btw dear .... m not messing with up .... but in the manual of altivar it has been written tat vfd can b test without output or low load ....so I just wanted to know the method that's it
If you will not have a 3 phase MOTOR load, you cannot test all functionality of the drive. A PWM drive output is not really AC, but it ACTS like AC in an inductive machine like a motor. Without the motor, you can look at the output with a scope to see the DC pulses, but other than that all you can "test" is that the electronics are working. You can hook up lamps in a 3 phase delta to the load terminals to see if the transistors are firing, but that will not really indicate much more than basic functionality. You would need to ensure that you have enough lamps in series on each phase to prevent them from burning out immediately from high voltage, but not knowing your voltage, you will have to determine that yourself.
If that Is all you want to do, then you can power it from single phase of the rated voltage of the drive, but you will need to know how to turn off the Phase Loss trip protection in the drive.