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Originally Posted by Stubby79
Is it really that difficult to soft start a single-phase motor?  |
I'm not sure! I guess that's where the discussion starts - when no one actually knows ....
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I suppose it's having a full load already present that makes it a headache.
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Plus, in my case, trying to use a lower voltage, like 48V, to run what should be fed from a buss that's about 150V .... wait - that would be for single phase 120V not 220V. Paul - what voltage are you running your Buss at to get 220V?
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Thyristor control not work? You could literally dial-up the power...
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I think that's what my 3 phase soft starts do at work. That's a variation on what Paul does, reducing the voltage on start but not changing the frequency. We drop from about 10X rated current on a loaded start to around 3X rated current on a loaded start with the thyristor-based soft starts. With an AC controller, you should be able to stay under rated current the whole time and not heat the crap out of your motor .. in theory.