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Messages - dpollo

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91
Engines / Re: governor adjustment
« on: December 08, 2007, 07:23:25 PM »
To the best of my knowledge, the governor is all internal.  The only external control on the engine apart from the compression release levers is the  RUN/ STOP control.
 I have just measured the speed . It is a steady 2120 from  no load through 4 kilowatts and correction is instantaneous when adding or dropping loads.   I need to drop the speed to 1800.

92
Engines / Re: governor adjustment
« on: December 08, 2007, 03:50:07 PM »
Thanks for your responses so far.   Arithmetic tells me the engine is turning a constant 2000 rpm, however, I will measure with a shaft tachometer before proceeding. I can live with reduced hp as the engine is more than adequate for full load conditions as they now stand.

Reduced noise would also be a bonus.  I am familiar with governor operation on small hydro and gas powered stationary engines but Lister diesels are new to me and this one runs so well I do not wish to screw it up. I just want to get the frequency close to 60hz.

93
Engines / governor adjustment
« on: December 07, 2007, 11:26:40 PM »
I have a two cylinder Lister , 14.6 HP  ( BS649... on the tag.  #1616ST226    If I read this correctly it was built in 1976 as 2 cyl stationary engine) designed to turn 1800 rpm. I am running a single phase 5 kw alternator with it .  It is running about 16% too fast which shows up on electric clocks and other items requiring exactly 60 cycle current.

Is it possible to adjust the governor and if so, how is it done?  The governor works very well and is precise but simply set too fast. If this adjustment is not possible or inadvisable, I could change the drive ratio instead.

94
Lister Based Generators / Re: LV2 Lister genset not producing power
« on: November 06, 2007, 06:28:56 AM »
If your alternator produced power when you excited the rotating field with battery current, it suggests that the rectifier or its power transformer are not doing their job. It would be possible to test this on a bench or on your machine after isolating all leads by applying mains current at the same voltage as the alternator to the transformer input.  If you wire a resistance...such as a large lightbulb..... in your test circuit, no harm can result. (famous last words)  I am guessing here but when your unit is up and running, excitation for the revolving field is provided from the output side of the alternator, voltage is then reduced by the transformer to ...say 24 or so, then rectified for use in the revolving field. At some point in this circuit, the voltage of the field current (dc) is controlled by a regulator. This may be where the trouble lies. Any current reversals could damage the rectifier diodes just as in an automobile.  Above all, take all precautions to avoid personal injury.  As you mentioned, the unit put out power at a reasonable voltage when you excited it with a 12 volt battery, so that tells you the trouble is in the excitation circuit.


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