Brushless Alternator Problem

No joy over the phone to these people, then?

PWSlack has given you the path to follow.

Perhaps a service tech is in your future.

Your present course of action would be just as effective as asking the heavens for divine guidance.

GA. I think solution for this problem is in the last sentence.

Testing of rotating rectifiers.

One presumes that the diodes and bridge rectifiers were tested with the machine stationary.

It may be that when under centrifugal forces that the component characteristic may alter. I have seen this occur several times over the years.

You may have to "shotgun" the rotating electronic components and replace every one.

I presume that the unit was or has been working and failed, not out of the box and not working.

so definitely a lost connection will cause your problem

Therefore is there any possibility that a conductor where bent [ if using rectangular strip ] has cracked and going open circuit ?

Has a joint on the stator winding connections broken, has a low micro ohm meter been used to check paths et al.

My bet is a rotating diode going open circuit under speed.

It is said....?!?

Next might be incantations.

While I do not recommend measuring in the rotating equipment, figuring the scant qualification there. Still, the AVR is available for measurements. What does that say, while running, that is.?

Hi naren 326.

Please by my own experiece, check the AVR electronic component too

Bye

I guess This is KEL alternator with 2 Excitation system working at a time 1) AVR and 2) Compounding Excitation.

Please Do following -

1. Bye pass the AVR by removing the Fuse on the AVR, Now generator will work only on the Compound excitation System, Measure the Voltage on the Terminals ( Main Opt Put Terminals, not the Intermittent Joints, as this generator will have Intermittent Joints) with Load Cables Disconnected. If the Voltage is above the Nomonal Voltage ( Name Plate Voltage) is compound System is working Fine. If the Voltage is Lower Than the Name Plate Voltage, Try to increase the Air Gap of the Compound Excitation Unit's E and I Core, the voltage build up will increase.

2. If the Terminal Voltage with Bye Passed AVR is above Name Plate Voltage, Adjust the Voltage By AVR, Remember to Put the Fuse in the AVR.

Causion - do not feedle with the Rheostat, it has been set to achieve the Voltage Regulation at Various Load Conditions.

I feel this can help you..

Is the problem sorted out?

Yes, the problem is sorted out. As I already mentioned that, there was a loose connection between compounding transformer and bridge rectifier. I tightened the connections and run the alternator. Now,the alternator gives the rated output at rated rpm.