IS200VATFG1A is a Voltage Attenuator Feedback Board manufactured and designed by General Electric as part of the Mark VI Series used in GE Speedtronic Turbine Control Systems. The Voltage Attenuator Feedback Board in this context serves to attenuate or adjust the voltage of input signals within the control system while providing feedback to maintain stability and accuracy. This board typically employs a combination of resistors, capacitors, and operational amplifiers to achieve the desired voltage attenuation ratio and ensure that the output voltage remains consistent with the input signal. The board provides the control with a direct measurement of the DC bus neutral voltage. This signal is then monitored after being filtered and conditioned to remove the effects of bridge modulation. The voltage will be nearly zero if there is no motor ground fault condition. When there is a fault in the ground, the voltage is at its peak. The voltage increases almost linearly between zero and the maximum voltage in the case of a partial ground fault, which could be caused by damaged motor insulation. The ground fault voltage, variable Gnd cur signal is compared to thresholds to create the alarm or trip fault.
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