IS200EDCFG1A GE EX2100, Exciter DC Feedback Board

Description:

The IS200EDCFG1A board measures field current and field voltage at the SCR bridge, and interfaces to the EISB board in the control panel over a high-speed fiberoptic link. The fiber-optics provides voltage isolation between the two boards, and high noise immunity. Two fibers are used, one for each signal. There are two types of fibers which can be used for different distances, as follows:
• Plastic type fiber for distances up to 10 m
• Hard clad silica type for distances up to 90 m 

Refer to the following figure for a circuit block diagram.
Field Voltage Feedback: The field voltage is measured across the negative terminal of the bridge and the
positive terminal of the current shunt. After scaling the voltage with the jumpered resistors, the signals are input into a differential amplifier, which controls the voltage controlled oscillator (VCO).
Field Current Feedback: The field current is measured across a dc shunt at the SCR bridge. This generates a low level signal, with a maximum value of 500 mV, which is input to a differential amplifier. The output voltage from the amplifier ranges from ñ5 V to +5 V into a voltage controlled oscillator.
Power Supply: Power is supplied to EDCF from an external ±24 V dc source. From this, three voltage regulators produce +15 V dc, -15 V dc, and + 5 V dc. The PSOK green LED is driven by the ±15 V dc output voltages.

Datasheet Link:

IS200EDCFG1A GE EX2100, Exciter DC Feedback Board PDF Datasheet