JohnB
I've had this 7550EXL for about 7 years. Used it less than 60 hours during that time as it is used for power outages and we have been very lucky not to lose power that many times during the period. My luck ran out during Irene. I can't stress enough the need to properly maintain these portable generators so when you need them they work. Mine fired up right away and worked like a champ until day six when my computer did not start up right and a house fan died. I checked the voltage at one of the generator outlets and it was 131V. I removed more of the load and voltage increased to 138V. Engine was still revving at same RPM as under full load. Idle control was not working either. Not sure if anyone else has encountered the same situation and what the solution was. Thank you.
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MikeyfromNC
try checking voltage while reducing rpm.
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bronco
need to check hrz=rpm should be about 62.5 hrz to 64.0 hrz.
60hrz on you unit =3600 rpm =aprox 120/240VAC
62.5 =aprox 125/250 VAC
faster engine runs higher the voltage output this is on most portable generators some have some type of voltage regulator I don't think yours does
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MikeyfromNC
bronco is correct. There is a direct correlation between engine speed and HZ/Volts. Commercial power supplied to your house is a steady 60HZ(I checked mine and it is 60.013). That is what is needed to run sensitive electronics. When the HZ fluctuates the sine wave will get spikes and dips and become unstable (not smooth -for lack of a better term) and thats what usually causes you problems.

Bronco is there a reason to set the HZ higher than 60?
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