[modeleng] Re: voltage controll

Rich,
yes, I have done this as far as it was possible, but most of the 
components are not numbered, and the resostors not colorcoded (chinese 
electronics). this helped, but I cann't find some of the key components 
in any data base (and I have a big collection of them).
You will have guessed, that these key-components are the ones that are 
fried...so I cann't even determine wether they are traics or thyristors...
I have the print layout and the general principle of the circuit, but I 
am reluctant to use a design of my one, based on this partial info, 
since I do not want to burn out the field coils of the gen head.
That is why a circuit diagram would confirm my findings and put my mind 
at ease. Or prevent me from doing more damage; whatever the case may be...
Patrick

R.L. Roebuck wrote:

>Any chance of using the ruined/dismantled AVR to get a fix on where the 
>main power components are.
>
>Take one of the previously blown AVR's and bore down through those  bits 
>of the resin, so that you can bring the connections out, and then hook up 
>some respecified power components, mounted on heatsinks?
>
>Yours,
>
>
>Rich.
>
>
>On Tue, 27 Mar 2007, Patrick Coppens- Marian Lynch wrote:
>
>  
>
>>Thank you for this,
>>To answer one question
>>"especially if we are talking high voltage and power components (unless
>>this is your speciality)."
>>
>>yes it is...
>>
>>
>>
>>It is a matter of design, as these things have to dissipate way too much
>>heat, and are made of components that are what we call "borderline
>>spec". The dimensioning of the semiconductors leaves almost nothing as a
>>margin.
>>On top of this flaw (done for 'the cheap') the embedding in 'the gunk'
>>mentioned makes sure that the heat cann't go anywhere. So
>>transistors/triacs or thyristors call it a day....for good.
>>Imagine the cooler of your CPU in the very computer you use to,so
>>kindly,share your ideas with me is packed in silicone! It wouldn't last
>>long enough to read the answer to this message...
>>The cooling fins of the thyristors are on top of being packed in resin,
>>so small, that they are, in short; useless. this is done to make the
>>unit fit inside the generator head. This is ,next to the diesel, the
>>hottest part of the genset.
>>The people who make these sets, have by admission of one of there own
>>technicians, changed the place were they mount this unit.(outside the
>>gen head)
>>Not because they want to keep it cooler, but because it takes too much
>>time to dismantel the units (they seem to have to do a lot of that...)
>>The system of self exiting generator heads is a good one ,in concept, it
>>cals for little repairs.
>>So the manufacturers have to generate some trade in spare parts. This is
>>one way of doing it.
>>
>>
>>Many thanks
>>Regards
>>Patrick
>>
>>
>>
>>
>>
>>
>>
>>
>>R.L. Roebuck wrote:
>>
>>    
>>
>>>Hi there Partick,
>>>
>>>If I was tackling this myself, then I would possibly be thinking along
>>>the following lines. I may be wrong, but this is what my thoughts are...
>>>
>>>Is this a common problem for other people using these
>>>generator sets - if so you'd think that there'd be other peoples comments
>>>about it online for the make you have.
>>>
>>>If not, is it worth making sure you don't think it's something you're
>>>doing that's blowing it - 3 times is usually my limit for smoking bits
>>>before I sit down and have a few cups of tea, and run it past a colleague.
>>>
>>>If you're happy it's a problem with this make of AVR then is there any
>>>sense in buying an AVR for a different make of generator set, one with a
>>>better reputation?
>>>
>>>If not, then you're implying that all such AVR's have this kind of
>>>problem, and so no matter how much skill you have in the field, it will
>>>count for nothing, as you're looking at a reaearch and development
>>>problem, and you will doubtless spend more money on blown components in
>>>testing and trying that it will cost you to buy a handful of new AVR's -
>>>especially if we are talking high voltage and power components (unless
>>>this is your speciality).
>>>
>>>You will also end up spending valuable workshop time doing what you do all
>>>day at work.
>>>
>>>...it may be more of a reality check than what you were looking for - but
>>>I thought I'd put 'pen to paper' just incase the thoughts were of any use.
>>>
>>>
>>>Yours,
>>>
>>>
>>>Rich.
>>>
>>>
>>>
>>>      
>>>
>>>>----- Original Message -----
>>>>From: "Patrick Coppens- Marian Lynch" <sb286643@xxxxxxxxx>
>>>>To: <modeleng@xxxxxxxxxxxxx>
>>>>Sent: Tuesday, March 27, 2007 4:21 PM
>>>>Subject: [modeleng] voltage controll
>>>>
>>>>
>>>>
>>>>
>>>>        
>>>>
>>>>>Evnin' All
>>>>>
>>>>>I my Workshop, I have a 3 phase (6,5KVA) diesel genset.
>>>>>This provides the current for my (big ) lathe and a number of other 3
>>>>>phase motors.
>>>>>For the 3rd time the AVR (automatic voltage controller) has clapped out.
>>>>>At 100 euro's a pop, yours truly is fed up.
>>>>>I am an electronics engineer, so I can design/ make a more robust one
>>>>>myself, but it would help to have a circuit diagram of one.
>>>>>The commercial ones are embedded in a sort of gunk ,to protect them from
>>>>>moisture and prying eyes like mine...
>>>>>So it is impossible to get that stuff of, without totaly mangeling to
>>>>>circuitboard.
>>>>>I did that anway, only to find out, that most of the components have no
>>>>>serial/type numbers
>>>>>Even the resistors are not colorcoded!
>>>>>Any body any ideas?
>>>>>
>>>>>Patrick
>>>>>Flanders
>>>>>MODEL ENGINEERING DISCUSSION LIST.
>>>>>
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>>>>>
>>>>>
>>>>>--
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>>>>>Checked by AVG Free Edition.
>>>>>Version: 7.5.446 / Virus Database: 268.18.18/734 - Release Date:
>>>>>26/03/2007 14:31
>>>>>
>>>>>
>>>>>
>>>>>          
>>>>>
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>>>      
>>>
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>>
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