Supply: There are two possibilities.

1) The supply coincides with the sensing.

In this case the SR7/2 supply should be connected to terminals 3 and 5 (in the case of three-phase  genera-tors, terminal 5 is normally connected with the star point). Terminals 3 and 4 should be connected to each other in such a way that the supply is also the sensing. This connection is necessary when the generator does not have auxiliary winding for supplying the regulator.

2) The supply and sensing are separate.

This is the case of a generator equipped with auxiliary winding for regulator supply. Supply is always connec-ted to terminals 3 and 5 of the regulator. In both these cases (1 and 2) the SR7/2 supply can vary from 80 to 270 Vac. But it should be noted that terminals 2 and 3 should be bridged for supply with voltage between 80 and 160 Vac, while the same terminals should be left open if the voltage is between 160 and 270 Vac.

Sensing: should be connected to terminals 4 and 5 and can vary from between 80 to 700 Vac. The sensing is single phase only and therefore normally connected to one alternator phase.

Operation at 60 Hz: When operating at 60 Hz, terminals 5 and 6 should be connected to each other in order to keep the low frequency protection correctly regulated.

External potentiometer: the 100 kohm (0,5W) external potentiometer that permits a  +   5 % distanced regulation of the voltage should be connected to terminals 5 and 7.