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Search: Posts Made By: Lucien Nunes
Forum: Generators 05-09-18, 08:04 PM
Replies: 23
Views: 774
Posted By Lucien Nunes
Option 1 Fit series/parallel switching on the...

Option 1
Fit series/parallel switching on the scooter, so that the batteries can be charged in parallel via a convenient input connector that would plug into the 12V alternator setup. No additional...
Forum: Events & Rallies Information Section 22-08-18, 12:38 PM
Replies: 51
Views: 4,940
Posted By Lucien Nunes
Sure will - last visit was in about 2012, haven't...

Sure will - last visit was in about 2012, haven't been regularly since the early 90s. I will doubtless get dragged elbow-deep into one of the said dynamos, always happens.

Autojumble was a godsend...
Forum: Events & Rallies Information Section 21-08-18, 02:53 PM
Replies: 51
Views: 4,940
Posted By Lucien Nunes
For a change, I'm actually going to get there....

For a change, I'm actually going to get there. Couldn't consider taking any plant but Kat and I will be there on foot Sat / Sun. Not having been to a rally for years, and not having done it in...
Forum: Generators 29-07-18, 07:21 PM
Replies: 27
Views: 1,116
Posted By Lucien Nunes
Noooo! Do the test we described. Remove the...

Noooo! Do the test we described. Remove the control box, link D & F together and run the dynamo, increasing the speed until you get 15V from D to frame. If you can't, the dynamo is faulty or running...
Forum: Generators 28-07-18, 05:52 PM
Replies: 27
Views: 1,116
Posted By Lucien Nunes
Chippie's suggestion is one good way to prove the...

Chippie's suggestion is one good way to prove the direction is correct. Motor it uncoupled from the engine just for half a second, with D & F linked together and to battery pos, and the frame to...
Forum: Generators 28-07-18, 05:27 PM
Replies: 6
Views: 451
Posted By Lucien Nunes
As Hubert mentions, the easiest situation is with...

As Hubert mentions, the easiest situation is with radial brushes. If they are trailing, then the brush holders would have to be repositioned. Although it is possible to run with brushes in a reaction...
Forum: Generators 26-06-18, 03:56 PM
Replies: 6
Views: 550
Posted By Lucien Nunes
If you are getting 12V AC out of the rotor, there...

If you are getting 12V AC out of the rotor, there is probably still enough residual magnetism for it to function i.e. the problem may be something else, for example the rectifier or field resistance....
Forum: Generators 07-06-18, 03:43 PM
Replies: 8
Views: 1,305
Posted By Lucien Nunes
Ah yes, did not see this, will write in full...

Ah yes, did not see this, will write in full later...
Forum: Generators 07-06-18, 03:41 PM
Replies: 13
Views: 848
Posted By Lucien Nunes
This appears to be a double-wound machine like a...

This appears to be a double-wound machine like a Start-O-Matic. I would expect the DC winding of the armature to generate 30V, supplying the shunt field and charging the battery at up to 3A. The DC...
Forum: Generators 07-06-18, 03:23 PM
Replies: 24
Views: 1,162
Posted By Lucien Nunes
Well I've logged in now and will have a look when...

Well I've logged in now and will have a look when time permits. Have had to curtail most extraneous activity for a few months while family members have been ill.

10W/cubic inch is a very rough...
Forum: Generators 30-04-18, 04:25 PM
Replies: 8
Views: 1,305
Posted By Lucien Nunes
Hi, sorry, I did not mean to abandon this thread!...

Hi, sorry, I did not mean to abandon this thread! Life suddenly got complicated and I lost track of various forums etc, only just now returning to where I left off. Have you got it running yet? If...
Forum: Generators 26-03-18, 11:52 PM
Replies: 47
Views: 4,572
Posted By Lucien Nunes
Excellent. It can be a long fiddly process when...

Excellent. It can be a long fiddly process when you start out with multiple faults and unknowns, but with tenacity most electromechanical things can be fixed. It's worth making sure that LC is...
Forum: Generators 25-03-18, 10:01 PM
Replies: 8
Views: 1,305
Posted By Lucien Nunes
First job will be to trace the wiring of the...

First job will be to trace the wiring of the generator. I might have the book for this plant but it is well to check anyway. It is also a good idea to inspect the commutator and brushes for signs of...
Forum: Generators 18-03-18, 08:34 PM
Replies: 28
Views: 1,966
Posted By Lucien Nunes
You're correct about flashing the field of an...

You're correct about flashing the field of an automotive dynamo, as dismantling or long storage can weaken the residual magnetism in the steel parts. A Start-O-Matic generator will also not generate...
Forum: Generators 17-03-18, 10:02 PM
Replies: 28
Views: 1,966
Posted By Lucien Nunes
Ah OK, that's not actually in the charging...

Ah OK, that's not actually in the charging circuit, its function is to rectify the forward drop in the detection choke to hold the detection relay once AC is applied to the load. I'm not surprised...
Forum: Generators 17-03-18, 05:41 PM
Replies: 9
Views: 940
Posted By Lucien Nunes
The specific requirement is to reverse the field...

The specific requirement is to reverse the field with respect to the armature. At the moment one end of each is earthed to the case - provided you swap the live and earthy ends of one or t'other, the...
Forum: Generators 17-03-18, 05:34 PM
Replies: 28
Views: 1,966
Posted By Lucien Nunes
Excellent news! But I am curious about this diode...

Excellent news! But I am curious about this diode - I'm not familiar with there being a diode in the charging circuit on this unit, I thought it was switched by a contact on LC, but never saw a clear...
Forum: Generators 14-03-18, 06:12 PM
Replies: 47
Views: 4,572
Posted By Lucien Nunes
Yes, replace LCR with a 1N5408. No point adding...

Yes, replace LCR with a 1N5408. No point adding any more variables into the equation and all old selenium recs are now likely to be variables. We know it rectifies - early in the testing we found the...
Forum: Member's Vehicles 14-03-18, 05:53 PM
Replies: 22
Views: 1,935
Posted By Lucien Nunes
If for aesthetic reasons a conventional...

If for aesthetic reasons a conventional alternator is unacceptable, then none of the methods I mention in my post above are applicable. However, if it can be tolerated, and you definitely want to...
Forum: Member's Vehicles 13-03-18, 11:43 AM
Replies: 22
Views: 1,935
Posted By Lucien Nunes
I'm not 100% sure that I understand the purpose...

I'm not 100% sure that I understand the purpose of the exercise: Is the aim here to upgrade an existing 6V vehicle from dynamo to alternator while keeping it 6V? If so, what dynamo is presently...
Forum: Generators 11-03-18, 10:48 AM
Replies: 28
Views: 1,966
Posted By Lucien Nunes
If your display digits are in the format 1999, a...

If your display digits are in the format 1999, a so-called 3 1/2 digit display, then the 20MΩ range will read up to 19.99 megohms (millions of ohms, note upper case M).The lowest increment it can...
Forum: Generators 11-03-18, 09:57 AM
Replies: 28
Views: 1,966
Posted By Lucien Nunes
Sorry, we may be at cross purposes. What is the...

Sorry, we may be at cross purposes. What is the resistance between the sliprings? If I read 'slipring brushes' as 'sliprings' in post #11 you are saying there is no continuity, which is a problem as...
Forum: Generators 11-03-18, 01:23 AM
Replies: 28
Views: 1,966
Posted By Lucien Nunes
If those readings were on the 20M range, that's...

If those readings were on the 20M range, that's OK for now. We like lots of megohms but a few is enough! It's helpful when quoting readings to include the units of measurement for clarity, i.e. 5.2...
Forum: Generators 10-03-18, 04:21 PM
Replies: 28
Views: 1,966
Posted By Lucien Nunes
For test purposes that suppressor can be replaced...

For test purposes that suppressor can be replaced with a bolt through a plastic bush, simply to connect the two cables together without them touching the casing.

There are two windings on the...
Forum: Generators 10-03-18, 11:46 AM
Replies: 28
Views: 1,966
Posted By Lucien Nunes
I would conduct a number of tests before jumping...

I would conduct a number of tests before jumping to that conclusion. The resistance of the DC windings is very low, and it would take a very large mains fuse to pass enough current for long enough to...
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