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Messages - djrm

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1
Petteroids / Re: Technical manual
« on: January 18, 2008, 10:57:12 PM »
The images were too small to read when I first uploaded them onto my server.
There are now full sized images too which you can actually read.
Beware though my server connection is slow and the images are large.

The manual is for my autostart Petter AVA1 generator with Aloc 230 Volt alternator / 24 Volt charger - starter

Dave.

2
Petteroids / Re: AVA1 generator in UK
« on: January 16, 2008, 11:33:29 AM »
Quote from: oliver90owner on January 14, 2008, 05:17:36 PM
djrm wrote: Unfortunately there is no mention of the DC specifications

If you supply details like machine serial number to Newage Engineering at Stamfod, they may well be able to supply information on the machine.  They made it.

Regards, RAB

How about this then, Yesterday I spoke to Tom Fern at Newage, he found a manual for an old generator, it is just the same as my own. He faxed me a copy of it today. I'm delighted. David.

3
Petteroids / Re: AVA1 generator in UK
« on: January 14, 2008, 01:06:16 PM »
The plate on the alternator has this writing on it:
Alco Generator
Arthur Lyon & Co (Engineering) Ltd
London Stamford
M/C No 9545/2
Ref No 6062/1
Volts 230
Amps 27
rpm 1500
Hz 50


Unfortunately there is no mention of the DC specifications. I have sketched the internal connections, see below. I am using the dynamo, it makes 24 volts which I reduce with a big resistor for charging the 12 volt battery. 12 volts is used for starting the engine, I expect it should be 24 volts too.

If you have any diagrams of a SOM using an alternator like this please let me know. Tho SOM diagrams I have are wired quite differentely from the way mine is.

Link to alternator wiring sketch: http://linux.djrm.dynamic-dns.net/gallery2/18021-1/AC-DC-generator.jpg

The engine plate has:
Diesel Engine
Petter AVA1
3.5 HP
1200 rpm
No 802435

I haven't ever taken the cowling off the head and do not know if the injector is sloping, the enngine number given above may help you decide.

Best regards, Dave.

4
Petteroids / Re: AVA1 generator in UK
« on: January 13, 2008, 09:06:11 PM »
Greetings Doug, thanks for the welcome.

The youtube video shows the genset operating at 37Hz output. The belt ratio is 1:1 and so the engine would have been running at 1110 rpm.

youtube AVA1 video link

The video was taken when I was making some adjustments to the governor, also the alternator was on load with both an electric fire and heavily charging the starter battery.

I have myself come to the conclusion that I may need to obtain a new weaker speeder spring but I have no idea about how to make one, the engine seems to regulate better at 1200 rpm than at 1500 rpm as I want it to.

Another possibility would be to fit a larger belt pulley onto the crankshaft and run the engine at a slower speed. I have made some tests at 1200 rpm but although the regulation is better it still isn't very good.

I expect that the only satisfactory solution will be to fit an electronic governor, this will also allow automatic stopping of the engine by removing the fuel supply when needed.

I have looked at the web pages you linked to but I haven't yet spotted the injector pump on the engine there.

Best regards, David.

5
Petteroids / Re: AVA1 generator in UK
« on: January 13, 2008, 05:25:47 PM »
Quote from: buickanddeere on January 13, 2008, 02:19:58 PM
  I'm favorably impressed to see  a belt shield.
I got the genset from a farm where it had been languishing in a barn for many years. I have painted the trailer chassis, the alternator  brush cover, and the belt shield too although I nearly took it off and left it because it was quite rusty. The trailer is the chassis from an old caravan. It had no mudguards when I got it.

I have started to keep an account of some of the things I'm doing with it here: http://linux.djrm.dynamic-dns.net/blog/2008/01/13/petter-ava1-generator

Best regards, Dave.

6
Petteroids / AVA1 generator in UK
« on: January 13, 2008, 10:15:41 AM »
Greetings everybody,
I have just been introduced to this forum, my initial impression is very favorable. There are a lot of dedicated people on here.

This is my genset, a 1951 Petter AVA1 with an Alco alternator.


The large alternator is used for starting the set as well as for generating 230 volts 50 Hz.

I'm doing some tests on it to enable me to make it a stable backup power supply. I'll need to have better speed and voltage regulation for that. I want to make it into an automatic stop and start system too.

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