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Topics - Davprin

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Lister Based Generators / LD1 Startomatic Charge rate switch info wanted
« on: December 01, 2019, 07:34:35 AM »
Hi all, on my unit, the charge rate switch in the alternator cubical is non-existent. I wonder if someone could point me to a photo that shows the wording of the fascia plate so that I can fabricate one, please. The charge resistor is in the box so itís just a matter of fitting an appropriate switch and fascia.

My Lister LD1 SOM did not come with a control panel and I have not been able to source one so far. I am fairly conversant with electronics so I have been toying with the idea of building a working panel from scratch using a mix of old and modern components where necessary. Hopefully, an original will turn up one day.

Has anyone been there and done that?

Here are some of the problems as I see it, and possible workarounds.

1.  Choke (CH) is a prominent part of the panel and plays an important role. This would be hard to replicate as it is unknown what material the toroidal core is made from. (I also note that different part numbers are given for the 12 volt and 24 volt chokes and it would be interesting to find out what the differences were. Maybe wound with different gauge of wire as the 1.5Kw generator outputs a max of about 6 amps whereas the 4.5Kw units puts out about 18 amps of current. Hopefully, someone may be able to explain the differences or take some measurements of wire diameter and toroidal core dimensions of both 12v and 24v chokes). Anyway, I would like to make a replica probably using an insulated core just for show and feed one turn only through a small current transformer and associated electronics to perform the same task as the original choke.

2.  The line contactor (LC) should be reasonably easy to replace with a modern relay with suitable contact rating if someone is able to measure the voltage across it's coil when the generator is operational, or, measure the resistance of the coil itself, please.

3.  Reset switch (K) - fairly easy to replicate it's function with a push button and timer/relay readily available and cheap.

4.  Detection relay (D) should be able to be replaced with any relay with a coil resistance of 100 Ohms.

5.  Meter - I should have something similar that I can modify and rescale.

I have attached the most modern circuit I have for the LD1 and SL1 generators. LD2 and SL2 circuit is very similar except for an extra resistor in the reset switch circuit and some difference in the wiring of the generator head.

Cheers from Australia

Generators / LD1 Start-O-Matic solenoid information wanted
« on: October 01, 2019, 10:00:29 AM »
My LD1 SOM is missing many bits and pieces including the fuel control and decompression solenoids. Because these are scarce to find, I would like to try to substitute some modern ones, at least for the time being. Could someone please tell me the stroke length of each.

I would also like to fabricate the round covers for the solenoids and would like some approximate measurements such as diameter and height of these, please.


Lister Based Generators / LD1 Start-O-Matic modified to manual start
« on: September 23, 2019, 04:04:10 AM »
Hello, I'm new to these forums and have a couple of questions.

I have what I believe to be an LD1 from around 1960 (LD1 10) and which was originally an SOM. There is no external control box and it apparently was modified to run as a backup generator utilising manual crank start only.

My questions centre around the engine control levers shown in one of the attached photos. The rearmost lever obviously was connected to a linkage which I presume operated the rack for speed control. The front lever looks like a weighted lever which does not seem to have been connected to anything. It does appear to have a pawl which can rotate around the arc in the rearmost lever. It looks like that pawl may be spring loaded down in the weighted section but it does not want to move with moderate pressure with a screwdriver

So, are my presumption correct and how would I operate these levers manually to start and run the engine, please?

I have attached some photos to show what I have. Thanks for reading

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