WOODWARD 1751-6091 Overspeed Tachometer Module

The power supply generates a regulated dc voltage for the operation of the circuits in the Load Sharing Module. The power supply gets its power from two of the three phase-potential connections which are made to the output of the generator set being controlled. Jumper wires on terminals 15 through 18 provide for selection of input voltages of either 95 to 130 Vac or 190 to 260 Vac. The plant wiring diagram (Figure 1-3) shows these connections and jumpers. Do not connect inputs to terminals 15 through 18.

Power Sensor 

Generator load is measured by the power-sensor circuit of the Load Sharing Module. The power-sensor circuit senses current amplitude, and produces a load signal proportional to the current amplitude times the power factor. The potential input comes from potential transformers (PTs) and the current input comes from the current transformers (CTs). The circuit uses these two inputs to generate a load signal which is then filtered and sent to the controller circuit. The load signal voltage of each generator set will be proportional to the percentage of rated load on the generator set. Ammeters and voltmeters may be driven with the same PT and CT wires.

Load Comparator Circuit

 In the load comparator circuit, the load signal voltage is balanced with the other generator sets in the system via the load sharing lines. The comparator circuit of each Load Sharing Module includes a load gain potentiometer to adjust each generator set's load signal so that the load signal voltage of each is the same at full load. This compensates for varying CT ratios or different generator set sizes. The load sharing voltage will be one-half the measured voltage of the load signal test point.

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