DS3800DVIA GE

Technical Specifications

• Product Type: Digital Voltage Input Analog Board

• Part Number: DS3800DVIA

• Manufacturer: General Electric (GE)

• System Compatibility: GE Speedtronic Mark IV Turbine Control Systems

• Input Channels: 16 differential analog voltage inputs

• Input Range: ±10Vdc, 0-10Vdc, 0-5Vdc (jumper-selectable per channel)

• Input Impedance: > 10MΩ (differential)

• Resolution: 12-bit (approx. 4.88mV per LSB at ±10V range)

• Accuracy: ±0.1% of full scale at 25°C; ±0.02% per °C drift

• Filtering: Fixed 10Hz low-pass filter (hardware)

• Protection: Over-voltage protection (±30V continuous); ESD protection

• Isolation: 1500Vrms opto-isolation between field inputs and logic

• Temperature Range: 0°C to +60°C

• MTBF: > 200,000 hours (MIL-HDBK-217F)

Key Features & Advantages

• High Channel Density: The GE DS3800DVIA provides 16 voltage inputs on a single 6U board, maximizing rack space efficiency.

• Field-Selectable Ranges: Each channel is individually configurable for ±10V, 0-10V, or 0-5V via jumpers, accommodating a wide range of field sensors.

• Precision Conditioning: The GE DS3800DVIA uses precision resistor networks (0.01%) and low-drift op-amps to ensure accurate, stable readings.

• Fixed Filtering: The integrated 10Hz low-pass filter removes high-frequency noise, providing stable readings in electrically noisy turbine environments.

• Diagnostic LEDs: Front-panel LEDs indicate over-range, open-circuit, and fault conditions per channel.

• Input Protection: ±30V continuous over-voltage protection prevents damage from wiring errors or transients.

Typical Application Cases

• Thermocouple Amplifier Outputs: The GE DS3800DVIA reads conditioned thermocouple signals (0-10V) from external amplifiers in older installations.

• Pressure Transducer Monitoring: Reads 0-10V or 0-5V signals from pressure transmitters on lube oil, fuel gas, and hydraulic systems.

• Position Feedback: Reads ±10V signals from linear potentiometers or position transducers on actuators and valves.

• Speed Pickup Signals: Reads voltage signals from magnetic speed pickups (0-10V) for turbine speed monitoring.

• Temperature Transmitter Outputs: Reads 0-10V outputs from temperature transmitters for bearing and exhaust monitoring.

Competitive Comparison

The GE DS3800DVIA is the voltage-input counterpart to the current-input DS3800DICA. Modern PLC analog modules offer higher resolution and digital diagnostics but require protocol conversion for Mark IV systems.

Selection Guidelines & Precautions

1. Range Selection: Configure jumpers per channel to match your sensor output (±10V, 0-10V, or 0-5V). Incorrect range selection causes clipping or reduced resolution.

2. Input Impedance: The GE DS3800DVIA has high input impedance (>10MΩ), so it does not load the source. However, verify the source can drive the input (almost always the case).

3. Filtering Limitation: The fixed 10Hz filter removes 50/60Hz noise but may attenuate fast-changing signals (e.g., dynamic pressure). For high-speed signals, consider a different board or external filter bypass.

4. Wiring: Use shielded twisted-pair cables for all inputs. Ground shield at the GE DS3800DVIA end only to prevent ground loops.

5. Over-Voltage Protection: While the GE DS3800DVIA withstands ±30V, prolonged over-voltage may degrade accuracy. Verify wiring before power-up.

6. Commissioning: Use a precision voltage source to verify each channel’s reading. Adjust calibration if necessary (using onboard trimmers if available).

7. ESD Handling: Use ESD-safe practices; contains sensitive analog front-end components.

8. Sourcing: Obsolete. Request functional test report including:

   • All 16 channels tested for accuracy (±0.1%)

   • Range selection verification (±10V, 0-10V, 0-5V)

   • Filter functionality test

   • Over-voltage protection validation

   • Isolation test

9. Spare Strategy: Keep one spare GE DS3800DVIA on-site. For critical measurements (e.g., overspeed, bearing temperature), consider redundant analog inputs using two boards.

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