GE VMIVME-4132-010 Vibration module

Start the prime mover. With the generator operating in the isochronous mode and not in parallel, load the generator to as near full load as possible.Use a clamp-on ammeter and measure the per phase current of the Current transformer output. Check that current in each of the three CT's is equal. In a balanced three phase system the Load Signal Out reading will be approximately: Load Signal Out = kW Input Calibration Gain X 0.1 X AMPs (rms reading of one phase). The kW Input Calibration Gain setting is in Service Menu M**LOAD SENSR AND DROOP**. A clamp-on ammeter is recommended to eliminate the need to open CT wiring to insert an ammeter in series with the CT output.

If the Load Signal 

Out Reading is within 10% of the above calculation, the PT/CT phasing is correct. If the phasing is incorrect, proceed to the Phase Correction Procedure. If the phasing appears correct, skip the Phase Correction Procedure and go to the Load Calibration Adjustment procedure. If after completing the LOAD SENSOR CALIBRATION and DROOP adjustments, the control loading is extremely sensitive to changes in the power factor when operating in parallel, complete the phase correction procedure.

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