Disadvantage of Electronic Soft Starter
Disadvantage of Electronic Soft Starter
(OP)
I have a question. Who knows what is disadvantage Electronic Soft Starter against Magnetic Soft Starter?
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Disadvantage of Electronic Soft Starter
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RE: Disadvantage of Electronic Soft Starter
The soft starter generates a lot of harmonic distortion during starting, but the time duration is short so it is not generally an issue.
In general, the soft starter will be less expensive, more flexible, and smaller in size - although a mechanical bypass contactor is still necessary. The old methods (auto-transformer, resistor, part-winding, wye-delta) are dead and I don't see them coming back. My parents had an old telephone with a rotary dial - it's not coming back either.
RE: Disadvantage of Electronic Soft Starter
RE: Disadvantage of Electronic Soft Starter
A VFD can be a cheap option, but you're taking a 5% efficiency hit and using a less reliable device.
RE: Disadvantage of Electronic Soft Starter
I also used to say that any electro-mechanical starting method has the advantage of unsophisticated users being able to watch things happen, which gives some people comfort I guess. But with current Arc Flash regulations, that's no longer possible anyway.
Now if, by saying "magnetic soft starters" you were referring to the one single type still sold in India after being abandon by the rest of the world 50 years ago, but trumpeted as "new" again, I will not further engage. To do so would require I use the term they coined for it, then anyone searching for it will end up being directed to their website because they are the sole manufacturer. That company has used this forum, and others, as a form of free advertising by posting "questions" and eventually dropping their trade name, indirectly driving hits to their site. If they want advertising, they should pay for it like everyone else.
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RE: Disadvantage of Electronic Soft Starter
I'd suggest that anyone who uses a VFD solely to get a motor started should invest in a proper bypass contactor setup. (Make sure you use a mechanically interlocked contactor to ensure you never apply line voltage to the VFD output.)