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Trace SW4024 shows error under/over speed as yes, what does that mean?

TRACE SW4024 shows Generator under/over speed error

 The Trace SW4024 120/60hz has a preset AC2 allowable frequency range from (53-67 hz)
If there is a frequency out of that range you will get a generator under/over frequency.
Solution: Service generator, replace bushings if applicable, and try to reduce max charge rate to see if the remedies the generator input. 
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