The equipment would not be harmed.
I believe you may be mistaken , the virus attacks Siemans software which monitors / controls the speed of the enrichment centrifuges. It "spun" up the Motors to beyond their "RED" lines therefore damaging them
They are very expensive and easily destroyed by imbalances and over-speed that's why they are tested at several times the operating rpms and balanced to safe limits.
Shutdown circuits that kill power are redundant and on completely different control systems for a reason, to make sure that they cannot be sabotaged by a single event. There are extensive critical path (CPM) studies done to make sure one fault cannot cause another and/or defeat independent safety devices.
That process is first year engineering studies and the Iranians are easily capable of seeing the risks.
My final point on this issue is that Siemens does make the PLC controllers but not the power inverters that power the centrifuge “motors”. The inverters only produce a limited amount of power, no matter how hard you step on the foot pedal, a car can only go so fast.