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Shunt regulator testing, minimum load?

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kramdra
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Joined: 28 Oct 2010
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PostPosted: 18:20 - 01 Aug 2022    Post subject: Shunt regulator testing, minimum load? Reply with quote

Have a new but questionable regulator to test, before fitting on a 125 - not my bike... To test, I have the 3 phases connected but the output only to meter.

While cranking and idle, the output voltage has a max of 14.1v, which seems good. However when revving, it goes over voltage upto 22v - this should never happen.

As I understand it, shunt regulators work by shorting the generator coils to maintain the correct output. Is there a minimum load on the regulator for this to function correctly?

If so, I'll connect a headlight bulb accross the output and test again, rather than return.

Thanks.
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Islander
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Joined: 05 Aug 2012
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PostPosted: 19:35 - 01 Aug 2022    Post subject: Reply with quote

You'd normally have a battery providing a load for the charging circuit so probably yes. It won't do any damage to provide one anyway.
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WD Forte
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Joined: 17 Jun 2010
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PostPosted: 19:39 - 01 Aug 2022    Post subject: Reply with quote

Assuming the RR is OK
The only circumstances that come to mind are if both pos and neg
outputs on the RR are 'floating' ie not connected
the device has no ground reference to set the output to.

Clamp the neg to ground and try again
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