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The EDCF board measures field current and field voltage at the SCR bridge, and interfaces to the EISB board in the controller over a high-speed fiber-optic link.

The fiber optics provides voltage isolation between the two boards, and high noise immunity.

The field voltage feedback circuit provides seven selector settings to scale down the bridge voltages appropriate to the application.

A dc shunt provides the bridge output current feedback signal.

The mV output signal is input to a differential amplifier on the EDCF board.

The amplifier output voltage controls the frequency of an oscillator, which generates a fiber-optic signal sent to the control module.

The bridge output voltage feedback signal is generated in a similar way.