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inverter fault recognition

I wonder if anyone could explain to me the way inverters recognise overtorque faults as opposed to overcurrent. I imagine current is used in both cases but what is the difference?

Cheers guys,

Bob

Reply to
bob watkinson
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Inverters are inherently controlling both the voltage AND the current along with the frequency, so it knows the values of all 3 all of the time. Current is just current. Torque is a mathematical calculation of power at a given speed. By knowing the voltage AND current, the VFD knows power (kW). It then can factor in speed (since it is in control of that) and give you torque.

Reply to
Bob

Cheers Bob, Bob.

Reply to
bob watkinson

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