PTO Generator Question

[Industrial Toys]

Warm water feels a little different heated at 58 HZ and some insist the food tastes a little off. In a power outage, I would say this is acceptable.

The frequency is handy for monitoring the load of your generator. If it was running at 62HZ and now you see 58 HZ, the load has likely increased. If you watch the current, this will likely be confirmed. Unless you have an Electronic Governor like Governors of America, the mechanical governors just aren't that accurate. And if you have a small set, eventually it runs out of overhead capacity and starts to slow down. THAT is why watching the frequency can be helpfull.

 

[RickB]

Watching voltage accomplishes the same thing. As related to PTO generators, frequency and output voltage change in linear fashion.

 

[Industrial Toys]

Not if your AVR is doing what it is supposed to and you have enough capacity.

 

[zzvyb6]

I can run my Winpower genny off of my JD F935 mower even though it turns the 'wrong' way from a driveshaft rotation standpoint. The only trouble is transferring our dinners to the freezer and the ice cream and ice cubes to the oven.

 

[LouNY]

Of the several pto generators that I have had or ran, they all had either a built in voltmeter or hz meter or both.
Plus my digital voltmeters have a hz scale and I have a kill-o-watt meter in the house that I can check if I want to.
On the farms 100 KW generator we did have to tweak the throttle a bit when milking and feed was completed and the load dropped by 90%.
At my home with my 25 KW once I have it set they will maintain +- 1 hz all day and night if needed.
Thats with the Branson 8050 on the economy setting, the IH 574 on 540, and the Oliver 1550 never needed much tweaking to maintain
good frequency and voltage.I did have to adjust the voltage regulator a bit when I bought my last generator 20+ years ago.
The IH 574 with the spline adapter on the 1000 rpm shaft and running at half throttle would drift a bit with loading maybe +- 3 hz and the voltage would
vary a bit. But that was only used at night after the major loads where done and it was just the water pump, the boiler and a few lights.

 

[Industrial Toys]

I tried that with a 23 hp tractor and a 15k Onan PTO set. It wouldn`t even spin the alternator without a load.

 

[daybreak1998]

Howdy,

Most tractors are rated by hp pto ratings. They get these ratings from the use of conversion factors of kw power made. You ever hear of a dyno? Anyway, without getting to technical, the rule of thumb 2hp per 1 kw of power produced is a standard. Most owners of a PTO generator do not look at the tractors tach. That is not important. You raise the engine speed to where you see the gauges on the PTO generator says 60Hz and 240 volts.

A 4 pole PTO generator spin internally at 1800rpm's.
Here is my Tiger Power 30KW PTO generator running with a 19kw load.

 

[mikester]

Maybe it would help, if someone could actually tell, what "sensitive" electronic equipment someone might have that could care if the frequency was 55 or 65 HZ. I'm dying to know. I'm sure some UPSs may not accept an out of range frequency, but beyond that, I can't think of anything.

Generally any piece of electronic gear that needs such an accurate time base, has it's own internal oscillator.

Many newer power supplies (for global markets) practically accept DC to light for frequency.

VFDs might trip on voltage/current/phase/frequency. Might be an issue running your CNC equipment.

 

[zzvyb6]

As is commonly known in the industry, a few VERY HIGH horsepower electric motors are somewhat sensitive to A/C frequency because of the large inductance of the armature. As for electronics, globalization has produced the requirements for operating over a wide range of frequencies without trouble(s). For example, Japan has BOTH 50 AND 60 Hz. power grid characteristics, all within the same country !

BTW: My 22 hp lawn mower easily spins over my 50kW Winpower pto genny. If yours doesn't, I'd disconnect it from the township grid and send it back to it's country of origin. I'm not loading it with 50kW, only about 5% of that. When I need 50kW, I haul out the 4020.

 

[CobyRupert]

VFDs might trip on voltage/current/phase/frequency. Might be an issue running your CNC equipment.

Maybe...
But like electronics, VF Drives typically rectify the AC input to a DC voltage that then gets chopped back up into the "AC" (variable frequency (VF)) output the motor sees.
For example, a Allen Bradley Power Flex 750 Series "480V" drive can tolerate any input frequency between 47 and 63 hertz, and operate at input voltage between 342V and 528V.
There is a proportional motor power output reduction if input voltage is reduced.