Sterling Power Products PDARRC manual Explanation for Positive field control alternators

Explanation for Positive field control alternators

Let us assume that the system over leaf has a regulator on the positive side of the rotor. then there is one important fact, and that is because the regulator is between the brush and the positive then the other brush is connected directly to the negative. also the positive brush has the regulator between it and the 14 v input supply and can never reach 14 volts due to the 2 volt drop between the input voltage and the field brush There fore the readings are very obvious, one brush will give between 2-12 volts( depending on the output voltage of the alternator ). , and the other brush will give 0 volts

Hence in the instructions we come up with this voltage scenario. In this case the field control wire is the one with 2-12 volts on it

If we want to fit the sterling advanced regulator ( s ) on the drawing, then all we need to do is to introduce another 14 feed into the field brush. we acheive this by obtaining the voltage via our brown cable ( d+ ) , bring it up to the regulator, then through the regulator down the white wire to the field brush, in effect by pass the standard regulator

This also shows 2 important things

1)if the sterling regulator was to fail open circuit, then the standard regulator simply takes over

2)no matter what you do to the sterling regulator you cannot stop the alternator from working. so if the alternator is not working it has nothing to do with the Sterling system

Explanation for Negative field control alternators

Let us assume that the system over leaf has a regulator on the negative side of the rotor. then there is on important fact, and that is because the regulator is between the brush and the negative, and there is always at least 1-1.5 volts drop across a regulator, the brush closest to the regulator can never reach 0 volts, it will always be between 2-about 10 volts. Also the other brush will never be the same voltage as the field brush, as the voltage must pass through the rotor coil , the end result will be at least another 2 volt drop. The other brush is connect directly to the output voltage of the alternator.

There fore the readings are very obvious, one brush will give between 2-12 volts, and the other brush will give about 14 volts ( depending on the output voltage of the alternator.

Hence in the instructions we come up with this voltage scenario

In this case the field wire is the one with 2-12 volts on it

If we want to by pass the standard regulator, all we need to do is put the sterling advanced regulator on the end of the 2-12 volt wire and give the voltage another path through the sterling regulator to negative, in this case the standard regulator continues to work and tries to shut down the current, but the sterling simply offers the current a new route, via our whit wire, up to our regulator then down our black wires to negative.

This also shows 2 important things

1)if the sterling regulator was to fail open circuit, then the standard regulator simply takes over

2)no matter what you do to the sterling regulator you cannot stop the alternator from working. so if the alternator is not working it has nothing to do with the sterling system

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