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SEM regulation problem

K

kimmoill

Joined Jun 2007
5 Posts | 0+
Hi!

I couldn't register to ktmtalk so I try my luck here. I have SEM electrics in my '90 Ktm GS250. From stator comes 2 yellow wires for lights and red, green and black for ignition. Ignition works just fine. Resistance between two yellows is 0,5 Ohms.

I've connected the regulator and 24V bulb(just to be sure) to series. I believe it's correct?

Problem is that I can't regulate the voltage to 12V. Measuring straight from between two yellow wires the voltage in high rpm is nearly 40 volts. Measuring from light's pins with regulator I get about 25 volts in high rpm. I tried with new regulator, no help. Strange that the regulators I've tried just ''cuts'' the voltage.

All I need is to get the head- and tail-light working moderately, that's all. So AC current is not a problem. Tail-light is 12V led so 24V bulbs don't help.

I was missing all the lights' magnets from the flywheel so I clued new ones all around flywheel. Looking at this picture
http://www.husaberg.org/modules/gallery ... .sized.jpg shows that magnets aren't all around.

Is that the reason I can't regulate the voltage?
 
Hi kimmoill,

The voltage you are getting from the stator is correct, but when you put magnets back in a flywheel they have to be put back North South all equal if not it won't work, that could be one of the problems the other is the regulator not being earthed properly, but if you have had to regulators on and the problem is still the same I would say the flywheel magnets are at fault.

Regards

Sparks.
 
Two things,
ac-regulators are the weirdest thing you can ever imagine, when the +peak to -peak voltage rises above the setpoint they start to shortcircuit the stator to keep the voltage down but, and here comes the weird thing, only in one direction. A dc short on an ac line is bound to make odd things happen, maybe the stator iron is getting saturated from the resulting overlayered dc or something, anyway the ac waveform will get skewed at his point and is not a true ac (nor a true dc) waveform. The less the stator is loaded the weirder the waveform, use something loading the stator, like a headlamp wether it is at 24 or 12V and the measurements will be truer.
And here is where the second thing comes in, the ac voltmeter. Unless it is a so called TRMS voltmeter it might not measure the voltage correctly. Even then you can not be sure. Common ac voltmeters are fine on pure ac, what voltage is on a regulated stator is far from pure.

And then a third thing, some ktms disconnect the regulator as you put out the lights so that there is absolutely no load on the stator, if you measure the stator voltage in this mode it SHOULD be very high.

Did you measure the resistance between any yellow and ground (engine or frame) too?
 
Hi Smorgasbord,

A bit to elaborate post for most people, you could of also gone on to say what frequency the circuit runs as well, but hey the guy only wants to know why he is getting no regulated voltage not a lesson in AC schematics.
In layman's terms simple and straight to the point. Interesting reading though.

Regards

Sparks.
 
OK,
Connect a 12V 15W-60W lamp, not less. if it works the regulator is working, if it blows it doesn't. If it doesn't it doesn't either, or something else don't.

The points were:
the regulators are electrically weird, measured voltage does sometimes not make sense when they are in the circuit. Do not expect to easily understand what is happening. Especially at low load conditions.
And ktm wiring can be different.

It feels like I'm messing things up even more.
 
Hi Kimmoill,

My appologies for not welcoming you to the UHE site even though you are from the KTM side, I would get rid of that flywheel, by using it, it is defenatly going explode and when they do they usually take the stator as well.
Not had to much to do with the KTM models but generally they are pretty much the same as the Husaberg, apart from yours has only one charge circuit the Husaberg has two so both the yellow leads are free from earth. You should find that any 12 AC regulator will do the job. Looking at your picture it looks like it is an inverted type flywheel the type fitted to the 99 to 03 Husaberg where your idnition stator fits in the ignition cover.
If this is the case give DCR's a call they are in the UK 0044 1772 612118 they do have just the flywheel for sale, but the big question is, is the taper the same degree angle but it's worth giving them call there's a good chance it's the same as the Husaberg as nearly all SEM flywheel tapers are the same.
Hope this helps.

Regards

Sparks.
 
It's good that somebody answers something, it can help. So no swet Smorgasboard and sparks. 8)

I checked that every other magnet is north and same to south.
I just can't understand that regulator cuts the voltage like resistor. Even in idle it ''regulates'' the voltage to under 12 volts.

Yellow wires are not connected to frame.

I have two regulators. In other says tympanium and in other says nothing. Tympanium was connected to frame and other was bolted to the airbox. They have two leads, yellow and brown. I believe yellow is incoming and brown outgoing.

How can this be so hard? :lol:
 
Hi kimmoill,


The other way to connect it and is the more the conventional way is one yellow to earth the other yellow goes to the regulator and from this same connection is the regulated voltage and the brown wire will be the dump feed to earth.

Can you tell us where in th world you are?.

Regards

Sparks.
 
sparks said:
Hi kimmoill,


The other way to connect it and is the more the conventional way is one yellow to earth the other yellow goes to the regulator and from this same connection is the regulated voltage and the brown wire will be the dump feed to earth.
Click to expand...

Do you mean this? Can this connection harm the ignition when stopping the engine?
 

Attachments

  • wiring.JPG
    wiring.JPG
    19.2 KB
Ok I will try eplain it another way, the brown lead which you are taking to the lights I think should go to earth this lead carries the excess voltage you don't require that is why your voltage is so high.
Put the Brown lead to earth when you have connected the yellow wire from the stator to the regulator take a lead from the same connection and this wire goes to your lighting. Put the other Yellow from the stator to earth.
If you don't understand I will find some way of sending it in diagram form computers are not my thing.

Regards

Sparks.
 
It works! 8)

Just connected the yellow wires to the lights and the regulator in parallel.

Thanks to you all!

How ''big'' fuse would be good to this system? When testing I had 7,5 Amp fuse and it blew couple of times. Would 10 Amp be any better or is it too ''big''?
 
Hi Kimmoill,

Glad to here things are working OK, yes 10A fuse will be OK.

Regards

Sparks.
 
So, you put both yellow wires to the regulator and light? And regulator brown to the ground?

I ask that, because i will be same project (and i'm from Finland like you...)
 
I think not, you connect the two yellows to the regulator, then to the battery. The light is connected to the battery as well.

I am going to sort out all of my electricals this week-end, since my stator is still in transit, and I will take mucho photos of all the new wiring I put in there, plus certainly use one some electronics CAD to redraw the new layout, and post here as well.

Anything to get away from the wife and kids, when you can't ride, and you're disgusted at your national rugby team, I guess.
 

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