Thread: VFDs and line reactors questions
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Jon Elson[_3_] Jon Elson[_3_] is offline
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Default VFDs and line reactors questions
wrote:


I have as yet not powered anything up but have read about problems,
one of them being drives failing from power surges upon powering up.
Apparently a line reactor helps to prevent damage from current surges
upon powering up.
VFDs should be desinged to handle the inrush surge. Small VFDs may use NTC
thermistors or resistor/SCR circuits, my big VFD (11 KW) has a contactor
that clunks a half second after power-on, so it uses a resistor and relay to
short the resistor after the cap bank is charged.

2.5 mH is sure not going to help much with the inrush surge.

Jon
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