M-flex factory VFD panel with bypass problems
M-flex factory VFD panel with bypass problems
(OP)
I have 8 Schneider VFD panels that have a bypass with overload protection built in. On 60 hz, the panel works as it should. But, when I turn it down to 30 hz, the overload relay trips within a couple minutes. What is causing this? It is an electronic overload. It is doing this on all 8 panels.





RE: M-flex factory VFD panel with bypass problems
RE: M-flex factory VFD panel with bypass problems
Bill
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"Why not the best?"
Jimmy Carter
RE: M-flex factory VFD panel with bypass problems
Also, as a general design rule, the OL relay on a VFD bypass is placed in the circuit so that it is only being used when the bypass starter is in use, so it would not even be in the circuit when the motor is running at 30Hz. Sounds to me as though someone built these without a good understanding of all of the potential pitfalls.
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington