When I shut down my VFD, the lights are on and the cooling fan continues to run for 3-4 minutes, til the capacitors are drained. The Mfg warns that a shock hazard exists until the display and fan are stopped. So I have to accept their warnings. It is a Lenze SM Vector 5hp unit.
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Panel breaker sizing for a VFD (yet another question on that topic...)
- Thread starter maxime.levesque
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- vfd panel
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- Aug 13, 2020
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My understanding has been that VFD convert the incoming power to DC, and then use that to generate a much higher frequency signal (3kHz to 16kHz) that can look like the 60Hz to the motor. The conversion requires a small "holding tank" of power to be able to supply the output. They have capacitors. . . but, they don't have "starting" capacitors.
BTW, that DC intermediary is why they can run a 3-phase motor off of 1-phase power.
BTW, that DC intermediary is why they can run a 3-phase motor off of 1-phase power.