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Search: Posts Made By: Lucien Nunes
Forum: Generators 07-06-18, 03:43 PM
Replies: 8
Views: 971
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: 542
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: 781
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: 971
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: 3,881
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: 971
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: 1,637
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: 1,637
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: 741
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: 1,637
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: 3,881
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: 1,566
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: 1,566
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: 1,637
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: 1,637
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: 1,637
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: 1,637
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: 1,637
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...
Forum: Generators 06-02-18, 06:15 PM
Replies: 47
Views: 3,881
Posted By Lucien Nunes
Regarding rewinding the coil of LC, as it is for...

Regarding rewinding the coil of LC, as it is for fairly high voltage DC it will have many turns of fine wire. However, if you can discover exactly what gauge the wire is, by pulling up an outer turn,...
Forum: Generators 01-02-18, 05:08 PM
Replies: 14
Views: 1,409
Posted By Lucien Nunes
It's not a starter motor Paul, the DC armature...

It's not a starter motor Paul, the DC armature winding of the generator serves as a starter with an additional series field. I don't know the fuse rating but the protection it offers is fairly...
Forum: Generators 28-01-18, 11:16 PM
Replies: 47
Views: 3,881
Posted By Lucien Nunes
Ah sorry I didn't respond to your previous post....

Ah sorry I didn't respond to your previous post. Indeed - a (somewhat) higher voltage rating is always OK, and the capacitance is close. Electrolytic capacitors like this have very wide tolerances -...
Forum: Generators 13-01-18, 09:50 AM
Replies: 47
Views: 3,881
Posted By Lucien Nunes
Oh well, it was worth asking. A few times I have...

Oh well, it was worth asking. A few times I have spent hours looking for second-best substitutes, later to discover that the original component is still available from stock.

Seeing as your lamp...
Forum: Generators 09-01-18, 01:44 PM
Replies: 47
Views: 3,881
Posted By Lucien Nunes
Yes, LC1 and LC4 are contacts of LC. The notation...

Yes, LC1 and LC4 are contacts of LC. The notation for relays is that a letter represents the coil, and can be used to refer to the whole relay, where the number of contacts is often given under an...
Forum: Generators 04-01-18, 12:48 AM
Replies: 47
Views: 3,881
Posted By Lucien Nunes
Auto sequence and possible problems... When...

Auto sequence and possible problems...

When S1 is at Auto and the plant is at rest, the detection circuit monitors the load with 24V, waiting for a circuit to be completed to initiate the start....
Forum: Generators 31-12-17, 01:42 PM
Replies: 25
Views: 1,300
Posted By Lucien Nunes
For anyone following this, you might notice that...

For anyone following this, you might notice that the terminals on the back of Mark's panel are connected in the same sequence as on my schematic in post 9 above, as read from left to right. I should...
Showing results 1 to 25 of 500

 
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