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VSD problems


Hi I used a VSD to run a three phase electrical motor, 50hz, 4 poles, 380V supply. I measured and calculated my input electrical power supply (from utilities provider) to be 684 W using sqrt(3)VI and then measured the output current from my VSD to my motor using a tong tester. The VSD had a voltage indicator so I used that as my voltage output. When calculating my ouput power using sqrt(3)VIcos(theta) I get a power output of over 800 W, which does not make sense. So can someone explain to me what I am doing wrong, or why this is happening?

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