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sbkenn
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Join Date: Jan 2020
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Old Markon Generator Trouble

01/27/2020 8:29 PM

Hi. Can anyone advise me on repairing or replacing with electronic, the AVR on an old Markon 15kVA 3-phase generator. The original has 2 x 3-phase transformers, one of which broke loose and seriously damaged one of the coils. The rotor is also 3-phase (4 slip-rings).

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SolarEagle
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#1

Re: Old Markon generator, trouble

01/28/2020 1:08 AM

You need all these test components...

https://www.genpowerusa.com/automatic-voltage-regulators/markon-036-245-voltage-regulator/

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SolarEagle
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#2
In reply to #1

Re: Old Markon generator, trouble

01/28/2020 1:34 AM

https://diary-of-electric.blogspot.com/2019/05/wiring-diagram-avr-of-3-phase-generators.html

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sbkenn
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#3
In reply to #2

Re: Old Markon generator, trouble

01/28/2020 6:13 PM

Wow, that was quick and to the point. Thank you. I am not convinced that that AVR will be able to supply enough power for a 15kVA generator, but your response 1) does give me more confidence to find a higher-rated one. 2) Confirms the circuit arrangement.
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SolarEagle
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#4
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Re: Old Markon generator, trouble

01/28/2020 10:07 PM

If you understand the principals involved you should be able to make it work...good luck

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setlock77
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#5
In reply to #4

Re: Old Markon generator, trouble

01/29/2020 8:05 AM

so will this somehow energize the third leg and does it subsequently lower the output by a third?

he stated that one winding was damaged.
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SolarEagle
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#6
In reply to #5

Re: Old Markon generator, trouble

01/29/2020 12:44 PM

Well I would hope the damage has been repaired, as this would seem to be a prerequisite to normal function...

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sbkenn
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#7
In reply to #5

Re: Old Markon generator, trouble

01/29/2020 12:53 PM

one winding of the old feedback circuit is damaged. The electronic AVR will render that redundant.
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sbkenn
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#8
In reply to #2

Re: Old Markon generator, trouble

01/29/2020 12:59 PM

Looking again, this won't work. There are 3 coils (4 brushes) on the rotor, at least oner will need to be fed with DC. This diagram is for a brushless system.
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SolarEagle
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#9
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Re: Old Markon generator, trouble

01/29/2020 1:43 PM

https://electronics.stackexchange.com/questions/397669/avr-regulation-brushless-vs-brush-alternator

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