PowerMate Gen on freq but high volt
I have a 1997 Coleman Powermate generator PM04777023. It does not have many hours since it is only used for occasional power outages and when it is exercised every couple of weeks.
I checked the volts and freqs with a meter and found the volts at 140/280. I got a kill a watt meter and checked the volts and freqs and found that if I set the volts, by adjusting rpm, at 120v the freq was at 57hz no load. I set the freq at 62.25 and the volts come in at 131 no load. I set the freq on advice of the local small engine tech who said that they set the gens they work on at 62.0-62.5 hz no load so they have some wiggle room when the load is applied because circuit boards and electronics are most sensitive to out of limit freqs.
When I put a 1800w load on the gen the freq goes to 61.x and the volts is about 126. That's 5% of 120v. Is that something to be concerned with in terms of damaging electronic circuits, motors and equipment?
Secondly is there a way to adjust the voltage output of this gen without changing the rpm of the engine which will change the freq also?