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6 volt weird issues Lodola

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Nick from Kent View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Nick from Kent Quote  Post ReplyReply Direct Link To This Post Posted: 25 Sep 2016 at 09:07
My old (original) regulator was doing the same thing and totalled two batteries before I twigged that it was at fault. 
I found my Bosch regulator in a box of Motobi bits in the shed, but they are still available on ebay.

If you need something to get you going you are welcome to borrow my VW Beetle regulator.

What voltage are you expecting at the battery? Mine is getting 7.8v which seems ok. I went out for about an hour yesterday and it was fine with the lights on and no blown bulbs. Having said that, if the solid state one you mention works out, let me know and I'll go down the same road. It cost nearly £200 to have my dynamo rebuilt and I don't want to do that again!

How was the climb?
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italianmotor View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote italianmotor Quote  Post ReplyReply Direct Link To This Post Posted: 25 Sep 2016 at 09:52
The hill climb was great, thanks, the Lodola with its straight through (old) silencer sounds great and goes well, the motor (touch wood) is so strong, and I think that people looking at its state are always amazed that it even works.

As I mentioned, mine is charging, at higher revs and on the stand, with the lights off, at between 7.4 to 7.5 volts, and I would imagine that on the road and at top speed it's going to be higher than this. From what I have read and heard, this is just too much and will gas or boil the battery, which in fact it did the other week - so I'd say your charging at 7.8 volts is high. The guy selling the regulators I mentioned above says that they are set to cut out at 7.2. Like you say, I don't want to be paying to have to get a dynamo redone if it's working now. Thanks for the offer of the loan, I'll be ok for now and think I might order one of these things sooner than later.

I came aross this somewhere on the web too, useful pages, even if about Matchless bikes: http://matchlessclueless.com/electrical/general/battery-voltages/

State of charging
of battery

Per lead-acid
battery cell
(2.1v nominal)
6v nominal
batteries
(3x cell)
12v nominal
batteries
(6x cell)

Minimum for charging 2.15v 6.45v 12.90v
Trickle charging 2.25 – 2.27v 6.75 – 6.81v 13.50 – 13.62v
Normal charging 2.30 – 2.35v 6.90 – 7.05v 13.80 – 14.10v
Fast charging
(risk of gassing)
2.40 – 2.45v 7.20 – 7.35v 14.40 – 14.70v



Edited by italianmotor - 25 Sep 2016 at 09:55
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Nick from Kent View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Nick from Kent Quote  Post ReplyReply Direct Link To This Post Posted: 25 Sep 2016 at 10:03
Thanks for that. It looks like they're going to get two orders this weekend...
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 25 Sep 2016 at 10:50
I would have thought that 7.8 volts in a 6v system was a bit on the high side, it equates to 15.6v in a 12v system, far too high and will boil a battery.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Nick from Kent Quote  Post ReplyReply Direct Link To This Post Posted: 24 Oct 2016 at 17:49
Just fitted the Dynamo Regulators Ltd DRV4 and it seems to do the job perfectly. Thanks Italian Motor!
http://dynamoregulators.com/dvr4.php
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italianmotor View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote italianmotor Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar 2017 at 16:15
Okay, after a good thrash to Brighton and back, seems like the Lodola has stopped charging, again. Thing is, I tested the dynamo on the bench and spins up fine. So does that mean it is working ok but not putting out enough output? I have a hi-tech reg/rectifier on this bike now, but am assuming that has nothing to do with it as the dynamo seems not to have any output. I did put a meter across the terminals of the dynamo and it was 0.6 volts or something. Anyone know more about, say, if the brushes are worn, would this affect output lots, or just a little? Thanks!


Edited by italianmotor - 20 Mar 2017 at 16:46
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Nick from Kent View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Nick from Kent Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar 2017 at 16:28
How fast are you spinning it to get .6v? A drill won't get nearly fast enough; the pulley ratio must be about 2:1 so at two thousand RPM your dynamo is spinning at 4000 rpm - faster than a drill. Might be worth taking to an auto electrician to have it checked (I used Curd Bros.near Tunbridge Wells, excellent). The DRV4 works well on mine BTW.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar 2017 at 17:03
When you say you tested the dynamo on the bench, did you have it connected to the regulator and battery?
Without that there will be no current through the field coil, and thus no output, or at best very little, due to the small residual magnetism in the field magnets.
 
On a dynamo by the way, the commutator and brushes are the rectifier, you don't have another one.


Edited by Brian UK - 20 Mar 2017 at 17:06
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar 2017 at 17:08
Poor brush contact will affect the output, what state is the commutator surface in. Is it true when you spin the armature? If it's out of true, it would cause the brushes to bounce at higher speeds.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote italianmotor Quote  Post ReplyReply Direct Link To This Post Posted: 21 Mar 2017 at 07:44
Hi Brian - I connected the two terminals with wire, earthed the case then put 6 volts across the terminals, and it motored fine. No, the regulator is on the bike, it's a solid state reg/rectifier. I couldn't get the dynamo to spin while still on the bike using the above method. I did notice the belt is about to break so I'll need to replace but it was taught enough to spin the dynamo off the flywheel.

Originally posted by Brian UK Brian UK wrote:

When you say you tested the dynamo on the bench, did you have it connected to the regulator and battery?
Without that there will be no current through the field coil, and thus no output, or at best very little, due to the small residual magnetism in the field magnets.
 
On a dynamo by the way, the commutator and brushes are the rectifier, you don't have another one.
Guzzi lover doing my own thing: http://www.italianmotormagazine.com
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 21 Mar 2017 at 10:11
So you connected it up and ran it as a motor? Depending on the torque produced that would prove all the coils were intact.
Assuming the belt was on when you tried it on the bike, then as a motor it's not producing much torque.
 
Yes, I know the regulator is on the bike, I was being a little pedantic, as it's not a reg/rectifier, the dynamo produces DC by design.
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italianmotor View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote italianmotor Quote  Post ReplyReply Direct Link To This Post Posted: 21 Mar 2017 at 10:37
Yes, I meant regulator, I keep thinking of the device I have on my alternator Guzzis. Yes, it ran. So you think I should have the dynamo checked out? Seems it works but not sufficiently?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 21 Mar 2017 at 16:17
Not wishing to also be a pedant, but if the reg is solid state there is doubtless a diode in it to prevent the battery current going back into the dynamo.

"Chicken nuggets don't dance on a Tuesday."
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italianmotor View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote italianmotor Quote  Post ReplyReply Direct Link To This Post Posted: 21 Mar 2017 at 16:55
That doesn't affect whether the dynamo is working or not though?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 21 Mar 2017 at 18:39
Assuming all the various coils in the dynamo are good, and the commutator isn't worn or burned, and the brushes are good, the output of a dynamo is dependent on rotation speed, and the current passing through the field coils. The latter is supplied by the regulator.
Dynamos never work as well in motor mode (assuming it's a true dynamo - the dynastart is a little different).
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