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Old 07-15-2019, 09:29 AM   #41
JRTJH
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Quote:
Originally Posted by WDPatterson View Post
One thing to keep in mind is that most generators need to be set up for around 63 Hz during no load "idle", and check to make sure they're at 60 hertz, or a little bit over, when under load...
That applies to "direct drive" conventional generators, not to the newer "inverter technology generator" which is, in reality, an alternator that produces DC voltage and an inverter to "change that to 60 Hz, 120 VAC. The inverter generator is not "speed related to frequency output" as the inverter always produces the same frequency regardless of motor speed. That's why you can "slow the generator" by turning on the ECO switch and even at the slower speed, you still get the same 60 Hz output.

The "older generators" typically called "contractor generators" are speed governed and must run at 3600 RPM to obtain a "true 60 Hz output" That type of generator, as you suggest, usually "bogs down" at maximum load and may benefit by increasing the "no load RPM" slightly higher than 3600 RPM, so when it's under maximum load, it will "slow down to the appropriate speed.

The issue then becomes, will the increased frequency (greater than 60 Hz) cause a problem when operating the generator "below the maximum output load" ?????
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