[doobiedowner]

Hacked VFD firmware makes the most sense to me. The PLC/PAC is giving a reference of xx Hz, the hacked VFD overrides the speed reference to destroy the centrifuge but reports back that everything is tickety-boo.

[kumarvvr]

I think Stuxnet was much more sophisticated, and the pump (along with VFD) could be an entry point into their network.

The centrifuges that were destroyed are not driven by pumps. Motors, yes, but not pumps.

[hoofhearted]

It was a Siemens system, so PXC.