3000W Chinese Gensets Info.

jasult wrote:
Professor, have a question on my 3500/4000 model 46514 The last few days I have been running my heavy 7 inch grinder that is 15 amp and every few minutes the champ would shut off. First thing after checking oil and was good i disconnected the low oil shut off but that did not help.Fuel supply looks good as I removed bowl and checked flow with float working. Even with choke half on when cold did same thing.
If i run my smaller 4 inch grinder all is good but the 15 amp grinder causes it to stall but always restarts with 1 pull. I would have thought the breaker would trip not the engine stall.
On the web site they talk about the avr voltage adjustment and in 120v side it should be about 130v. Mine shows 120v. Any thoughts??
thanks, jim

Just thoughts, Jim, not solutions.

Thought #1 is as you load the engine the fuel demand rises. If the flow into the float bowl cannot keep up with the fuel burned a shut-down will occur. Remove the tank petcock and check the screen for trash. Clean as needed. Just for giggles, loosen the tank fuel cap to be sure there is enough air getting into the tank. We have found some that do not vent properly. Also check to be sure the spark arrestor screen in the end of the muffler is not clogged with carbon or trash from inside the muffler. As exhaust pressure builds due to an increased load an exhaust restriction can kill an engine.

You can adjust the DC excitation voltage from the AVR and thus the AC output voltage by turning the tiny brass head screw on the 10-turn pot on the backside of the AVR. Of course, you must remove the end cap and the AVR to access the adjustment screw. Adjust while holding the AVR, engine running, with a good DVM connected to the output.

Remember that voltage accounts for electron pressure and current for the number of electrons. Increasing the voltage may give you more punch when starting a high current load that causes voltage drop in the wiring and a rapid collapse of the magnetic field, but it does not give you more overall power. From the symptoms you describe, I doubt that increasing voltage output is your solution.

BTW - I run my 9" Craftsman grinder from basically the same genny without the issues you describe, so something is not right. The genset is more than capable of maintaining the load.

Let us know what you find.