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What will happen in an VFD if any two terminal of the output power given to motor (R,Y,B) are interchanged

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    \$\begingroup\$ Typically the motor runs in the opposite direction than it did before the switch. \$\endgroup\$ – John D Aug 24 '16 at 5:25
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VFDs are used to drive three-phase motors. Swapping two phases will have the effect of reversing the phase sequence.

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Figure 1. Effect of swapping two phases.

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Interchanging two phases in a VFD output will reverse the direction of motor rotation. This can be eithor done physically or by means of parameters in the Control unit of VFD.

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