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"Why did the VFD not take the motor offline, and instead it was the CB?" That's what I'm trying to find out

There was no faults to ground in the conductors to the motor, the breaker reset with no problem and the motor ran perfectly drawing 33 amps.

We have a 50 HP motor at 480 v that is serviced through a 100 amp CB and VFD controlled. It runs a large fan that exhausts fumes from one department into a Regenerative Thermal Oxidizer to "cook" off the fumes before they are released to the atmosphere. I got a call from the second shift...

All went well, had the power co. come down and de-energize the line side coming in. Threw the switch, made a visual inspection threw it back in and another inspection good to go. Will do this on a yearly basis in the future. The service was installed in 1977.

Thanks guys, I was going to shut off all of the circuit breakers in the panel first, but I think I will contact the power coompany in regards to "killing" the feed to the service also.

Should I have any concerns about exercising a 2000 amp main Pringle switch that hasnt been exercised in about 10 years?