GE DS200NATOG3A Voltage Feedback Scaling Board

Description

Technical Specifications

• Manufacturer: General Electric (GE) Industrial Systems
• Model: DS200NATOG3A
• Series: Mark V Speedtronic, DS200, LS2100 Static Starter
• Board Type: Voltage Feedback Scaling / Sensing Board
• Function: SCR bridge voltage attenuation, isolation, and scaling
• Form Factor: 3U VMEbus compatible, plug‑in card
• Dimensions (W × H × D): 140 mm × 160 mm × 25 mm
• Weight: 0.5 kg
• PCB Protection: Conformal coated for environmental resistance
• Voltage Input Range:
  • AC: Up to 5 kV RMS
  • DC: Up to 6 kV
• Output Signal Range: 0–10 VDC (isolated, low‑level feedback)
• Scaling Accuracy: ±0.1% full scale (FS)
• Isolation Voltage: 2,500 VAC (input‑to‑output)
• Input Impedance: >1 MΩ
• On‑Board Components: Precision resistor network, high‑voltage dividers, isolation amplifiers, filter circuits
• Configuration: Multiple stab connectors and jumper options for selectable attenuation ratios
• Power Requirements: +5 VDC, ±15 VDC (from VMEbus backplane)
• Environmental Ratings:
  • Operating Temperature: -40°C to +70°C
  • Storage Temperature: -55°C to +85°C
  • Humidity: 5%–95% non‑condensing
  • Vibration: 5–2000 Hz, 0.1 g²/Hz
• Compliance: UL, EC, CSA standards for controlled transients and electrical safety
• Status: Obsolete (discontinued; available as legacy new surplus or refurbished stock)

Key Features

• High‑Voltage Attenuation: Safely reduces high AC/DC SCR bridge voltages (up to 5 kV AC / 6 kV DC) to low‑level 0–10 VDC signals suitable for control system analog inputs.
• Precision Resistor Network: Utilizes high‑stability, low‑tolerance precision resistors to ensure accurate and repeatable voltage scaling with minimal drift over time.
• Galvanic Isolation: Provides 2,500 VAC isolation between high‑voltage input and low‑voltage output, protecting control circuitry and reducing electrical noise interference.
• Noise Filtering: Integrated low‑pass filters suppress high‑frequency switching noise from SCRs, delivering clean feedback signals for stable closed‑loop control.
• Configurable Ratios: Onboard jumpers and stab connectors allow selection of multiple attenuation ratios to match specific system voltage ranges without hardware modifications.
• Conformal Coating: Protects electronic components from dust, moisture, chemicals, and vibration in harsh industrial environments, extending operational life.
• VMEbus Compatibility: Seamlessly integrates into standard 3U VMEbus racks, enabling direct connection with other Mark V and LS2100 system modules.
• Reliable Industrial Design: Constructed with heavy‑grade materials and industrial‑quality components to support continuous 24/7 operation in power generation and process plants.

Applications

• GE Speedtronic Mark V Turbine Control: Provides precision voltage feedback for gas and steam turbine control systems in utility power generation plants.
• LS2100 Static Starter Systems: Used in turbine static starters to monitor and control SCR bridge output voltages during turbine startup and operation.
• Large DC Drive Systems: Integrates with GE EX2000 and DC2000 DC drives for metal rolling mills, paper machines, mine hoists, and large extruders requiring high‑voltage feedback.
• Excitation Control Systems: Delivers accurate voltage feedback for generator excitation systems, ensuring stable and precise excitation regulation.
• Power Generation Auxiliaries: Controls critical auxiliary equipment such as boiler feed pumps, induced draft fans, and large compressors in thermal power stations.
• Oil & Gas Industry: Deployed in compressor stations, pumping facilities, and offshore platforms for high‑voltage motor control and system monitoring.
• Process Industries: Used in refining, petrochemical, and chemical plants for controlling large motors in pumps, compressors, and process machinery.
• Legacy System Retrofits: Direct replacement for older GE voltage feedback boards in existing Mark V and LS2100 installations, extending the life of legacy control infrastructure.

Additional Notes

• The DS200NATOG3A is a critical spare part for maintaining operational continuity in plants relying on GE Mark V turbine and LS2100 static starter systems.
• While discontinued, it remains available through authorized GE distributors and specialty automation suppliers, with new surplus units typically carrying a 12‑month warranty.
• For new installations, GE offers modern voltage sensing boards compatible with Mark VIe systems, featuring enhanced isolation, digital communication, and diagnostic capabilities.