The fans of air coolers are usually variable frequency; half of them operate at a fixed speed. Do fans with a fixed speed generally require a speed indicator?
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Personally, I think it doesn’t matter whether it’s included or not; I’m not sure what the common practice is. Please advise, experts! O(∩_∩)O Thank you
It’s not necessary to add it at the power frequency, but it can be added at the variable frequency
There’s no need to add anything; usually, variable-frequency fans are used for regulation, and as long as they can meet the requirements for adjustment, that’s sufficient, since there will definitely be a indicator showing the target value for adjustment.