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Misc: Charging Systems Regulator for MZF-12A dynamo

Vincent from Ghent

Well Known and Active Website User
VOC Member
My Rapide has a Chinese dynamo type MZF-12A. The fuse was burned out and after replacement, the battery didn't charge any longer. I cleaned the commutator and tested the dynamo. It seems to work well now, so I think the (electronic) regulator is broken. (I don't know how to test it though). Is it possible that a malfunctioning dynamo blows the fuse and/or the regulator ? And does anybody know what type of regulator is required or advised for this kind of dynamo ?
There's not much information on it:


regulator.jpg

Thanks in advance,
Paul.
 

mercurycrest

Well Known and Active Website User
VOC Member
You need to look at how the field leads and armature leads are connected to the brushes so you can determine if the field is internally, or externally grounded. Then you will know which type of regulator you need. To make the generator "motor" did you ground the "F" lead from the generator? That would be an externally grounded generator. "F" to "D" is internally grounded.
 

Marcus Bowden

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VOC Member
I've always tested with D & F together to the positive battery terminal, negative to earth and should motorise in direction of driven rotation and will be polarised for negative earth at the same time, it's now good to go.
bananaman.
 

Vincent from Ghent

Well Known and Active Website User
VOC Member
@ mercurycrest and Marcus: I found some information on internet:
When I connected both terminals W and AW together to the +terminal, and the -terminal to the earth, the dynamo was running fine.
Next, I mounted the dynamo to the engine again and measured the tension between A+AW and earth (battery disconnected) at "fast" tickover: 7 to 10 V. Is this test good enough to decide that the dynamo is ok and that the regulator must be faulty ? Is there an easy way to test the regulator ?
(Sorry, I don't know much about electronic equipment)
 
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Marcus Bowden

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VOC Member
Sorry, I'm no expert on electronics although had to get to a certain standard when doing my engineering tickets of competency that has gone the same way as the majority of stuff I learnt at school & college. Sucket and see is the advice I give now but be ready to pull the plug when you see insulation leaking smoke.
bananaman.
 

vin998

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VOC Member
VOC Forum Moderator
Sorry, I'm no expert on electronics although had to get to a certain standard when doing my engineering tickets of competency that has gone the same way as the majority of stuff I learnt at school & college. Sucket and see is the advice I give now but be ready to pull the plug when you see insulation leaking smoke.
bananaman.
When I started my electrical apprenticeship the first two rules I was told by the instructor called Jeff was:
1. When you see smoke it too late
2. Getting the smoke back inside the wires is the tricky bit.

Simon
 

Vincent from Ghent

Well Known and Active Website User
VOC Member
Thanks Vibrac, but I've found that article already. Very good information indeed. What should I do without internet nowadays ? Actually , it is not the first regulator I'ld have to replace and, asking for advice about testing methods, I never got any other advice than: try a new one and you'll find out if the old one was faulty.
 

mercurycrest

Well Known and Active Website User
VOC Member
The problem is without a schematic of your particular regulator, there's no way short of opening up and unpotting it to know for certain. Have you contacted the manufacturer?
 

Vincent from Ghent

Well Known and Active Website User
VOC Member
The manufacturer of the regulator ? The only information on that device is what can be seen on the photo of post #1. No make. I just ordered a DVR2 from DynamoRegulators Ltd. The comments (on internet again) are very good and the price is reasonable, so I'll find out soon enough. Fortunately, I have a magneto on the Rapide, so I can still ride it (now that "recreational" motorcycle riding is allowed in Belgium again.). Without lights though.
 

john998

Well Known and Active Website User
VOC Member
Hello, The chinamo is a rather crude device but robust. Had problems with 2 of mine last year, information will still be on this forum. Have tried both the DVR2 and the AO services units they both over charge. Ended up using a cheap imitation Lucas 12 volt tractor regulator off ebay, this gave the best control.
If you go with one of the electronic regulators they come with good instructions for the internal wiring. The electro mechanical regulator is wired as per Lucas. You dynamo may have different electrical characteristics to mine and be OK with an electronic regulator..
John.
 

Vincent from Ghent

Well Known and Active Website User
VOC Member
Hello John,
That's very interesting information. Unfortunately, not positive for the DVR2...


Using the search-function, I just found your previous posts (I didn't find them earlier) so I'm reading those now.
 
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vin998

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VOC Member
VOC Forum Moderator
I have used a DVR2 on my Rapide with a Lucas dynamo for the last 10 years and not had a problem. When I initially fitted it I measured around 13.5V across the fully charged battery with my cheap multimeter when the bike was running and that is approximately what a 12v lead acid battery requires. When the battery is fully charged the ammeter usually balances at zero or just above so the battery isn't overcharging. So it works OK on my setup and it has been fit and forget.

Simon
 

Comet Rider

Well Known and Active Website User
VOC Member
The manufacturer of the regulator ? The only information on that device is what can be seen on the photo of post #1. No make. I just ordered a DVR2 from DynamoRegulators Ltd. The comments (on internet again) are very good and the price is reasonable, so I'll find out soon enough. Fortunately, I have a magneto on the Rapide, so I can still ride it (now that "recreational" motorcycle riding is allowed in Belgium again.). Without lights though.
Your old regulator was built by Sean Hawker of CMES fame who stopped trading some 5 years or so ago.
I have run his regulators on everything from 36W lucas units to Chinamo's without any problems. Not to say that you are having problems at the moment. I wish you luck in getting to the problem, and would it be possible would have been willing to help you more directly.

Best of luck
Neil
 

john998

Well Known and Active Website User
VOC Member
Hello, meant to say that the DVR2 works fine on my Miller dynamo.
John.
 

Vincent from Ghent

Well Known and Active Website User
VOC Member
Thanks for your comments. I'll be back as soon as I've got the new regulator, but I wonder how long it will take ( brexit/ corona,...) to get it.
 

MartynG

Well Known and Active Website User
VOC Member
@ mercurycrest and Marcus: I found some information on internet:
When I connected both terminals W and AW together to the +terminal, and the -terminal to the earth, the dynamo was running fine.
Next, I mounted the dynamo to the engine again and measured the tension between A+AW and earth (battery disconnected) at "fast" tickover: 7 to 10 V. Is this test good enough to decide that the dynamo is ok and that the regulator must be faulty ? Is there an easy way to test the regulator ?
(Sorry, I don't know much about electronic equipment)
The attachment describes how to test an electronic voltage regulator.

Martyn
 

Attachments

Vincent from Ghent

Well Known and Active Website User
VOC Member
The DVR2 regulator was sent on Thursday and arrived in the mail the next Tuesday. Not bad at all. After installation, the reading of the ammeter is about twice as high as what I ever saw when the Sean Hawker one still worked. So far so good. On the road again !
Here's a little snapshot from this morning.

Kasteel van Ooidonk.jpg
 

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