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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Series ‘C’ Rapide Battery Not Charging
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<blockquote data-quote="oexing" data-source="post: 175357" data-attributes="member: 1493"><p>Sorry folks, my writing above about the workings of a traditional regulator was nonsense in so far that the field current is initially connected to ground , starting at the positive brush , through the field coils and to ground when still below battery voltage . Once voltage climbs the regulator voltage contact finger lifts to middle position between both sides at left in diagram. So the field current has to pass the resistor for reaching the ground finally. So in this state the field current will be reduced for less power and voltage. </p><p> No excess power will be dumped in Zener-diodes or some such. Those are to be found on permanent magnet alternators as they had no other means to limit voltage before better electronics were available later.</p><p> When speeds exceed 7V resp. 14V the voltage contact moves to right side and no more ground connection is available. So then no more power is produced and a new cycle of generation is started from lower voltage. All this action goes on in short durations with some sparking at contacts but will last many thousand hours . I did a conversion for tungsten contacts for wear on an E-Type dynamo regulator, no three phase alternator there in 1964 - and positive earth at that. Actually I like the non-electronic type as I can have voltage as I like it by some minimal bending of spring supports in there, having a multimeter at hand. </p><p> The option for resistor housed in field coil is no witchcraft, no other effects from this, just an easy place to put it. The Earles fork BMWs had a resistor mounted next to the 6 V 90W dynamo, not in field coil, no other differences in functions to the older way. Late 250 BMW singles had the resistor on the base plate of the regulator when placed elsewhere on the bike, rather corrosion effected unlike older types under engine covers. You can certainly fit a high load resistor instead of the four wire combi field coil just as well. </p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 175357, member: 1493"] Sorry folks, my writing above about the workings of a traditional regulator was nonsense in so far that the field current is initially connected to ground , starting at the positive brush , through the field coils and to ground when still below battery voltage . Once voltage climbs the regulator voltage contact finger lifts to middle position between both sides at left in diagram. So the field current has to pass the resistor for reaching the ground finally. So in this state the field current will be reduced for less power and voltage. No excess power will be dumped in Zener-diodes or some such. Those are to be found on permanent magnet alternators as they had no other means to limit voltage before better electronics were available later. When speeds exceed 7V resp. 14V the voltage contact moves to right side and no more ground connection is available. So then no more power is produced and a new cycle of generation is started from lower voltage. All this action goes on in short durations with some sparking at contacts but will last many thousand hours . I did a conversion for tungsten contacts for wear on an E-Type dynamo regulator, no three phase alternator there in 1964 - and positive earth at that. Actually I like the non-electronic type as I can have voltage as I like it by some minimal bending of spring supports in there, having a multimeter at hand. The option for resistor housed in field coil is no witchcraft, no other effects from this, just an easy place to put it. The Earles fork BMWs had a resistor mounted next to the 6 V 90W dynamo, not in field coil, no other differences in functions to the older way. Late 250 BMW singles had the resistor on the base plate of the regulator when placed elsewhere on the bike, rather corrosion effected unlike older types under engine covers. You can certainly fit a high load resistor instead of the four wire combi field coil just as well. Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Series ‘C’ Rapide Battery Not Charging
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