Strange frequency and voltage on paguro vte 4000 diesel generator *with video*

[aerobat]

Hello friends !

Maybe some here have an idea what it could be .

My ( 240v 50hz ) genny has 265volts and a wild frequency with no load but returns to ~ normal values when a load is put on it . Voltage is controlled here by a capacitor , no avr . I replaced the capacitor with a new 25uf one ( should be correct ) but the voltage is still too high so a risk to connect something sensitive on it .

I made a video when you can see the values of shore power line and generator line with and without a 1.5kw kettle on it .

Thanks for any ideas !

Best regards

 

[dingbat]

International Voltage and frequency standards are typically plus and minus 10% but have run into some weird situations with industrial power over the years.

There are a number of VFR schemes on the market. The fact that it works only under load would suggest the VFR circuit is switched on demand or using some of feed back loop.

 

[aerobat]

Excuse me , english is not my mother tonque . What is a VFR circuit ?

 

[kd4pbs]

I'm not sure what your definition of a "sensitive" load is, but most every modern electronic device will have a switching power supply. As such, they are highly immune to variations of input voltage and frequency. These little miracles can take garbage in and create pure DC out. 265 volts is just over 10% away from nominal, and while I wouldn't be worried about that voltage into a modern switching power supply, it's always smart to check the specs of the supply. I didn't look at that video, but if you're measuring this with a meter that is not a true RMS reading voltmeter, then it could be very much lying to you and indicating a much higher or lower voltage than reality.
Other loads, such as resistive heating elements and synchronous motors certainly wouldn't care.
The only thing that might have issue with that is things with linear power supplies such as older audio amplifiers and devices with "wall warts" that are not regulated.
As for the frequency varying, again, I didn't watch the video, but if the engine's speed governor cannot adequately control the engine, it is possible that there is loose or misadjusted linkages, a dirty or mis adjusted carburetor, ignition problems (points? timing?) or electrical issues (if it is an electronically controlled governor)

 

[aerobat]

Please watch the video . The generator engine runs like a kitty and is rpm stable all the time . The frequency normslly cannot be true . ~ 50hz at load and wildly swinging up to 400hz at no load .