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I have some issues in siemens 7.5 H.P Vfd which is connected to EX-A2X. the problem is auto on/off not taking place after power failure.when power resume motor not getting ON automatically. 

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You need to provide a LOT more information before someone can attempt to help you.

What PLC?

Which I/O module(s)?

Is the Run command given via a Digital Output from the PLC I/O or some other communication?

Has this been a problem all along or is it new?

If this has been happening all along, it sounds like a logic error by the original programmer. If so, it may be a simple fix.

Do you have the PLC program .vlp file? If so, attach it and someone should be able to give it a look over.

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