GE IS200EDCFG1A EDCF Exciter DC Feedback Module EX2100

Product Overview

The General Electric IS200EDCFG1A (functional acronym EDCF) is an Exciter DC Feedback Board designed for the GE EX2100 Series Excitation Control System. Mounted directly at the Silicon Controlled Rectifier (SCR) bridge, this module measures and conditions critical generator field voltage and field current feedback signals for real-time excitation control.

To ensure high noise immunity and complete electrical isolation in harsh high-voltage power generation environments, the IS200EDCFG1A converts analog voltage and current inputs into high-speed fiber-optic pulse streams transmitted directly to the EISB board in the control rack. Operating on an external 24 V DC power supply, the board weighs approximately 0.45 kg (0.99 lbs) and is rated for operation across temperatures ranging from -30°C to +65°C.

Core Technical Advantages

• Noise-Immune Fiber-Optic Transmission: Utilizes dual fiber-optic links (plastic for up to 10 m, hard-clad silica for up to 90 m) to transmit isolated feedback signals without electromagnetic interference.
• Selectable Field Voltage Scaling: Provides seven adjustable jumper settings to attenuate and scale SCR bridge voltages before feeding differential VCO circuitry.
• Precision Field Current Measurement: Monitors low-level DC shunt outputs (up to 500 mV) and amplifies them into a -5V to +5V range for high-accuracy current tracking.
• Onboard Voltage Regulation: Converts external 24 V DC power into isolated +15 VDC, -15 VDC, and +5 VDC rails, featuring a front-panel PSOK green LED indicator.

Technical Specifications

Installation & Gap Calibration Guide

• Wiring Connections: Attach the 24 V DC supply to connector J16, the current shunt signal to P1, and the field voltage sensing line to stab-on connector E1.
• Fiber-Optic Cable Routing: Route two fiber-optic cables from the EDCF to the EISB board, ensuring a minimum bending radius of 1.5 inches (38 mm) to avoid signal degradation.
• Power Verification: Confirm that the green PSOK LED illuminates upon applying 24 V DC, verifying correct function of the internal ±15 VDC regulators.

Technical FAQs

Q1: What is the main function of the GE IS200EDCFG1A board?
A1: It senses field voltage/current at the SCR bridge and transmits optical data to the EISB board. (95 chars)

Q2: What cable types and distances are supported for fiber transmission?
A2: Plastic fiber supports distances up to 10 m, while hard-clad silica fiber reaches up to 90 m. (93 chars)

Q3: How is field current measured by the IS200EDCFG1A module?
A3: It measures a 500 mV max DC shunt voltage across connector P1, converting it into a VCO frequency. (96 chars)