Description
DS3800NGRC1F1F Product Overview
The DS3800NGRC1F1F is a regulator-interface board used inside GE Mark IV and EX2000 turbine control racks. It plugs into the 6BA Euro-card file and serves as the analog “front end” between the 5 V CPU and the generator/exciter control loop: it buffers regulator set-points, isolates analog feedback (voltage, current, temperature), and clamps line surges with on-board MOVs. Because all copper traces are fully encapsulated in high-temperature epoxy, the board is treated as a line-replaceable module—any internal fault requires a complete card swap rather than component-level rework. Installation is plug-and-play: rack the old card, move the two 40-pin back-plane connectors, and the CPU acknowledges “REGULATOR OK” on the next scan—no software download or calibration required.
The DS3800NGRC1F1F is a regulator-interface board used inside GE Mark IV and EX2000 turbine control racks. It plugs into the 6BA Euro-card file and serves as the analog “front end” between the 5 V CPU and the generator/exciter control loop: it buffers regulator set-points, isolates analog feedback (voltage, current, temperature), and clamps line surges with on-board MOVs. Because all copper traces are fully encapsulated in high-temperature epoxy, the board is treated as a line-replaceable module—any internal fault requires a complete card swap rather than component-level rework. Installation is plug-and-play: rack the old card, move the two 40-pin back-plane connectors, and the CPU acknowledges “REGULATOR OK” on the next scan—no software download or calibration required.
GE DS3800NGRC1F1F
DS3800NGRC1F1F Technical Specifications
-
Model Number: DS3800NGRC1F1F
-
Manufacturer: General Electric (GE Fanuc)
-
Product Type: Regulator Interface / Auxiliary Control Board
-
Series: DS3800, Mark IV / EX2000 Speedtronic
-
Form Factor: 6BA Euro-card (≈ 233 × 160 mm)
-
Back-Plane Connector: Dual 40-pin header (J1/J2)
-
Assembly Code: C-ESS (essential-service qualified)
-
Input Range: ±10 V or 4–20 mA (jumper-selectable)
-
Isolation: 1500 Vdc channel-to-ground; group-isolated
-
Surge Protection: 40 mm MOVs, integral with board traces
-
Operating Temperature: 0 – 60 °C
-
Weight: 0.25 kg (0.55 lb)
-
Construction: Epoxy-sealed copper traces—non-repairable
Core Features & Customer Value
Integrated Regulator Buffering: The on-board isolation amplifiers accept both voltage and current signals, eliminating external signal conditioners. For the control engineer this means tighter generator voltage regulation and faster exciter response without additional hardware.
Epoxy-Sealed Construction: All internal copper is encapsulated in high-temperature epoxy. In coastal or industrial sites with conductive dust and high humidity the seal prevents trace-to-trace shorting that would otherwise cause random “REGULATOR FAIL” alarms after ten-plus years of service. The trade-off is non-repairability—any internal fault requires a whole-card exchange—but this is offset by reduced troubleshooting time and the fact that plants stock one spare instead of maintaining a repair bench.
C-ESS Assembly Qualification: The board carries the C-ESS code, indicating it is qualified for essential-service applications. For the owner this means the card has passed extended thermal-cycle and surge testing, giving confidence that it will survive decades of daily start/stop duty without degradation.
GE DS3800NGRC1F1F
Typical Applications
In combined-cycle power plants the board is installed in the Mark IV exciter cubicle where it buffers the generator voltage set-point and the brushless-exciter field-current feedback. During load changes the card presents an isolated ±10 V signal to the CPU so the voltage-regulation loop remains stable even when the utility grid experiences transients.
On utility-scale EX2000 static exciters the same card is used to isolate the diode-fail analog output and the field ground-detector signal. Because the inputs are group-isolated, a shorted transducer will not drag down the entire analog I/O rack.
Frequently the same part number is used on mechanical-drive gas compressors to isolate the inlet-pressure transmitter and the guide-vane position feedback. Its ability to mix voltage and current signals on one card makes it a universal “regulator isolator” for any Mark IV loop that needs deterministic, ground-loop-free operation.
