DS3800HAIC1C1B GE

Technical Specifications

• Product Type: High-Amplitude Isolated Current Output Board (Revision 1C1B)

• Part Number: DS3800HAIC1C1B

• Manufacturer: General Electric (GE)

• System Compatibility: GE Speedtronic Mark IV Turbine Control Systems (Rev. M and later)

• Output Channels: 4 independent isolated current outputs

• Output Type: 4-20mA or 0-20mA (jumper-selectable), loop-powered

• Drive Capability: Up to 100mA per channel (sourcing or sinking) – improved

• Loop Power: Internal 24Vdc isolated loop power per channel (galvanically isolated)

• Compliance Voltage: 28Vdc (allows driving loads up to 700Ω at 20mA) – improved

• Isolation Voltage: 2500Vrms reinforced isolation per channel (channel-to-channel and channel-to-logic)

• Resolution: 12-bit

• Accuracy: ±0.1% of full scale at 25°C; ±0.012% per °C drift – improved

• Protection: Over-current, short-circuit, and reverse-polarity protection per channel

• Diagnostics: Individual channel fault detection (open-loop, short-circuit, over-temperature, load impedance variation) with LED indication and backplane reporting

• Temperature Range: -40°C to +75°C (extended)

• Heat Dissipation: Active thermal management with integrated heatsink, temperature sensor, and variable-speed cooling fan control output

• MTBF: > 180,000 hours (MIL-HDBK-217F)

Key Features & Advantages

• Per-Channel Reinforced Isolation: The GE DS3800HAIC1C1B provides 2500Vrms isolation per channel, eliminating ground loops and protecting logic from field-side faults.

• Higher Drive Capability: Delivers up to 100mA per channel for driving multiple devices in parallel or long cable runs.

• Higher Compliance Voltage: 28V compliance drives loads up to 700Ω at 20mA.

• Enhanced Diagnostics: Individual channel fault detection (open-loop, short-circuit, over-temperature, load impedance variation) with LED and backplane reporting for predictive maintenance.

• Improved Accuracy: ±0.012% per °C drift ensures precision in fluctuating temperatures.

• Active Thermal Management: Integrated temperature sensor and variable-speed fan control output ensure sustained high-current operation without thermal derating.

• Extended Temperature Range: -40°C to +75°C suits harsh environments.

• Comprehensive Protection: Over-current, short-circuit, and reverse-polarity protection.

Typical Application Cases

• Explosive Atmospheres (Ex/ATEX): Provides galvanic isolation suitable for driving devices in hazardous areas with appropriate external barriers.

• Long-Distance Signal Transmission: Drives 4-20mA signals over distances up to 1400m with complete isolation.

• I/P (Current-to-Pressure) Converters: Drives I/P converters for pneumatic valve actuators with full isolation.

• Valve Positioners: Provides 4-20mA control signals for smart and analog positioners.

• Remote I/O Powering: Supplies isolated loop power and control signals to remote transmitters and actuators.

• Extreme Environment Installations: Extended temperature range suits offshore, arctic, or desert sites.

Competitive Comparison

The GE DS3800HAIC1C1B offers a balanced combination of high current, advanced diagnostics, active thermal management, and wide temperature tolerance, making it the preferred choice for demanding isolated current output applications.

Selection Guidelines & Precautions

1. Isolation Requirements: Provides 2500Vrms per channel. Ensure this meets your system’s safety requirements.

2. Loop Configuration: Verify sourcing or sinking mode. Set jumpers accordingly.

3. Load Resistance: Calculate total loop resistance. Drives up to 700Ω at 20mA. Exceeding this causes saturation.

4. Loop Power: Each channel has isolated loop power. Ensure field devices do not have their own power supply.

5. Cable Length: Supports cables up to 1400m. For longer runs, reduce load or use a repeater.

6. Active Thermal Management: Connect the variable-speed fan control output to a cabinet cooling fan (24Vdc, < 500mA) for active temperature regulation.

7. Diagnostic Reporting: Verify Mark IV firmware (Rev. M or later) supports backplane diagnostic reporting.

8. Load Impedance Monitoring: Familiarize yourself with fault codes for load impedance variation in the Mark IV diagnostic menu.

9. Short-Circuit Protection: Protected, but repeated shorting may affect reliability.

10. Commissioning: Use a precision current meter to verify each channel. Calibrate using onboard trimmers if necessary.

11. Wiring: Use shielded twisted-pair cables; ground shield at board end only. Do not connect shield to isolated output circuit.

12. ESD Handling: Use ESD-safe practices.

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

    • All 4 channels tested at 4mA and 20mA

    • Load regulation test (up to 700Ω)

    • Loop power verification (28V per channel)

    • Isolation test (2500Vrms per channel, channel-to-channel)

    • Diagnostic fault reporting validation (including load impedance monitoring)

    • Accuracy and drift test (±0.012%/°C)

    • Thermal management verification (variable-speed fan control)

    • Protection validation

14. Spare Strategy: Keep one spare GE DS3800HAIC1C1B on-site for critical isolated 4-20mA control applications. This revision is the preferred choice for demanding applications requiring diagnostics and active cooling. If you require higher current capability (>100mA) or the highest accuracy, consider the DS3800HAIA1E1D instead. Proactive replacement after 10 years of continuous operation is recommended.