Stamford Alternator 50-60Hz

[BoyNaruto]

Guys,

I have this stamford alternator from a MOSA generator. The motor plate says 50Hz but I want to operate to 60Hz. Can I adjust the speed of the engine, jumper the voltage regulator to 60Hz and adjust parameter in the engine control? Can this procedure give me 60Hz? Thanks

 

[edison123]

The voltage regulator, as the name implies, controls only the generator voltage, not its frequency. The frequency is determined by the speed of the generators.

Muthu

http://www.edison.co.in

 

[BoyNaruto]

Hi edison123,

Yeah i understand that, on the voltage regulator, there is a provision for 60Hz operation, alternator's plate tells 50hz with an rpm of 1500. If I adjust to 1800rpm, then from the motor formula I should get 60Hz. But one thing I am not sure of is the mechanical design limits. If I adjust the engine speed to 1800rpm, would there be any side effects?

 

[edison123]

Stamford and the engine OEM are the best sources to confirm the mechanical limit for 60 Hz.

Is the voltage regulator setting for 50 Hz and 60 Hz for the same voltage or two different voltages ?

Muthu

http://www.edison.co.in

 

[BoyNaruto]

Hi edison123,

Oops I missed that one, from the catalog i gathered from internet, the 380V/50Hz (1500rpm,), will be 416V/60Hz at 1800rpm..... guess we got the wrong generator.

Scenario is that again, we have 60Hz here in our area, my boss bought a 22KVA UPS for all the computers and he has the money to buy also this MOSA 35KVA generator equipped with UPS.

Just finished all the hook up and now I faced this problem. The ATS sees that the mains is 60Hz and the genset is only 50Hz, thereby not permitting the transfer. The UPS is also programmed for 60Hz operation.

Could you recommend any means of solving this problem...?? Thanks

 

[ScottyUK]

"Could you recommend any means of solving this problem...??"

Get a new boss?

It's likely on such a small set that you can run at 1800 rpm. Nothing will be particularly stressed on a small machine like that. Certainly it will do no harm to check with Stamford.


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If we learn from our mistakes I'm getting a great education!

 

[edison123]

Are you sure it's 416 V at 60 Hz ? It should be 456 V at 60 Hz. What is your system voltage ?

Muthu

http://www.edison.co.in

 

[DickDV]

I would say that, if the regulator mentions output at 60hz, then the mechanical's should be good enough for 1800rpm.

Then, its a matter of tweeking the regulator to get 460V

 

[waross]

Hi Dick. Most AVRs for small sets are small generic units that are suitable for a wide range of applications. The voltage is adjustable over a wide range to facilitate different applications. You may find an off the shelf AVR that is suitable for both 380V, 50 Hz, (AVR set at 220 V) and 480 V, 60 Hz. (AVR set for 277 V)
That said, mst diesel engines below the megaWatt range will all run happily at 1800 RPM. The alternators are generally identical for 50 Hz or 60 Hz, although they may be nameplated for either 50 Hz or 60 Hz.


Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[BoyNaruto]

Hi Guys,

Got the programming manual from Bernini Engine Control, they have some funny trick on programming though. I've adjusted the Over Frequency Alarm to 65Hz and checked also the over voltage alarm to 500V.

After this, I slowly adjusted the engine speed until I get 1800 rpm and continuosly checking 60Hz as well. The voltage goes up to about 435V, but I'm still lucky that there is still a room for adjustment down to 380V.

Hopefully though the alternator is designed also for 1800rpm. Now my boss is happy...hehe

 

[waross]

Good work BoyNaruto.
Yours
Bill

Bill
--------------------
"Why not the best?"
Jimmy Carter