25-04-2019, 06:30 AM
(This post was last modified: 25-04-2019, 07:43 AM by Bob Culver.)
It beats me. In conditions of low system voltage ie flat battery and lights on would expect the regulator to apply near continuous field feed which at 12v, would result in field current more than double normal (4X heating effect). How hot does field get on steady 12v? Maybe can take it (I have tried a steady 9v and does not get very hot.)
The “field” of an alternator is very low resistance so, unlike e.m. generator regulator, it happy with the original low resistance dynamo field. The alternator regulator probably has a maximum current sensing function but this likely far above anything a Seven dynamo could produce.
Maybe the conversions have never encountered a situation of very low battery and conventional high current lights on for a lengthy period after?
An additonal 1.5 ohm or so in the field lead would seem prudent. If this function is inside the regulator it would run warm.
We have some more clued in electrics than me. What do they think?
And Dave, I would be interested to know what the regulator is please? As far as I can fathom voltage is now often controlled by a signal from the car computer so a self contained regulator may be somewhat rare.
The “field” of an alternator is very low resistance so, unlike e.m. generator regulator, it happy with the original low resistance dynamo field. The alternator regulator probably has a maximum current sensing function but this likely far above anything a Seven dynamo could produce.
Maybe the conversions have never encountered a situation of very low battery and conventional high current lights on for a lengthy period after?
An additonal 1.5 ohm or so in the field lead would seem prudent. If this function is inside the regulator it would run warm.
We have some more clued in electrics than me. What do they think?
And Dave, I would be interested to know what the regulator is please? As far as I can fathom voltage is now often controlled by a signal from the car computer so a self contained regulator may be somewhat rare.