Did you recently disconnect or replace battery or AVR? Is polarization required?

 

Battery is OK.....AVR is replaced with new ones.
There is exciter polarity. I always double check them when connecting AVR and and I always test the winding's for insulation leakage.

 

Did you polarize it with a jumper to the battery?

 

I did not but the guy from customer side did it.
Not as per standard way but it did not help.

These guys always does these kinda things even though they do not understand the consequences involved in doing it the wrong way.
I have no knowledge on it but from what I read, one should use a power resistor while doing it. They dunno what a power resistor is. I did not have it then so I did not tried it.
What are you implying @BR-549

 

Implying?.......I was trying to recommend a solution. Sorry if I added confusion.

I will retire.

 

Implying?.......I was trying to recommend a solution. Sorry if I added confusion.

I will retire.

@BR-549
I am sorry...I used the wrong word there. Did not meant to offend.
I actually wanted to know what you are trying to say, I was hoping for a solution.

 

So what output voltage is claimed? Can you get an installation manual? I wouldn't attempt anything without them. The specs for the winding resistances require some good tools for accurate checking. Some data is on Stamford website, but u really need more info from them before spending customers money for no return

 

I was wondering if any one can tell what could be the cause of sparks flying around the diode set even when the genset is unloaded.

The output dies when the sparks comes, it starts at ~80% of output voltage

 

Also, I can't tell the significance of your measured 180vac. I don't know where in the schematic you were measuring. It may indicate a fault

 

Power resistor is a device able to limit the current drawn by polarising the deactivated magnets
It would have to not burn out when in use. If not used, field current may be damagingly hi

 

No problem.......I can only make general guesses because of the limited info. My suggestions just seem to increase the confusion.

With the cost of that equipment.......you should get a professional tech. I certainly would not get it re-wound......until I had it professionally troubleshooted.

 

There's always a possibility that it was improperly flashed. i.e. too much residual magnetism.

Does your phone work? Call the manufacturer.

 

I am gonna have a look at it after dismantling the whole thing.
Physical inspection is now necessary.

 

R!@@, If you google AVR AS440. theres a very good description of the AVR & how it should be set up.The Over excitation trip point is factory set @ 65V DC. & if a replacement AVR is fitted, theVoltage control should be set fully anti clockwise. Adjust the trim pot when monitoring generator output voltage. The AVR output is around 82V DC with 200V AC on gen O/P.

 

@debe
From what I have read, one should not touch the excitation trip point trimmer.
Your info is helpful. I have not come across that part. May be I did not see what you have read
I would appreciate if you could forward me that document.
And somewhere I read if the exciter is over excited, the generator may get damaged.
I cannot tell if the guys incharge have meddled with the trimmers. I did not compare the trimmer positions with the new one, although I did take a new AS440 with me. I regret that I did not do that.

I am reading everything I can get my hands on

 

@BR-549
getting professionals here is expensive than getting it rewound. Cause those who come will say that the winding is bad. This has happened

 

@Poor old sod
You don't need a schematic for this

 

R!f@@, sent the PDF file on the AS440 AVR by Conversation on this forum. Also sent by Email just incase.

 

R!f@@, sent the PDF file on the AS440 AVR by Conversation on this forum. Also sent by Email just incase.

Got it

 

Depends on What size you need. This thread is about a 250KV 3 phase generator, not portable ones.