GE DS3800HDDL1A1A

Technical Specifications

• Product Type: High-Density Digital Logic Board (Revision 1A1A)

• Part Number: DS3800HDDL1A1A

• Manufacturer: General Electric (GE)

• System Compatibility: GE Speedtronic Mark IV Turbine Control Systems

• Logic Inputs: 32 digital inputs

• Logic Outputs: 32 digital outputs

• Input Type: 24Vdc, 48Vdc, or 125Vdc (jumper-selectable)

• Output Type: Sourcing or sinking (jumper-selectable per channel)

• Output Current: Up to 500mA per channel

• Logic Capacity: Programmable logic array (custom GE design)

• Scan Time: < 5ms for full logic scan

• Protection: Over-current, short-circuit, and over-temperature protection

• Isolation: 1500Vrms opto-isolation (field-to-logic and logic-to-field)

• Temperature Range: 0°C to +60°C

• MTBF: > 150,000 hours (MIL-HDBK-217F)

Key Features & Advantages

• High Logic Density: The GE DS3800HDDL1A1A integrates 32 inputs and 32 outputs on a single board, providing extensive local logic capability.

• Dedicated Logic Processing: Offloads interlock and sequencing logic from the main Mark IV processor.

• Flexible I/O Configuration: Jumper-selectable input voltages and output configurations.

• Fast Scan Time: < 5ms for rapid logic response.

• Proven Reliability: Initial revision with long field track record.

• Diagnostic LEDs: Front-panel LEDs indicate input, output, and fault status.

Typical Application Cases

• Interlock Logic: Implements safety interlocks for valves, pumps, and other turbine auxiliaries.

• Startup Sequencing: Manages startup sequences for turbine auxiliaries and support systems.

• Alarm Processing: Processes alarm conditions and drives annunciator panels.

• Local Control: Provides local control logic for auxiliary systems.

Competitive Comparison

The GE DS3800HDDL1A1A is functionally identical to the base DS3800HDDL and remains the only Mark IV board combining high-density I/O with local logic processing.

Selection Guidelines & Precautions

1. Logic Programming: The GE DS3800HDDL1A1A requires factory or site programming. Ensure programming matches your application requirements.

2. Input Voltage Selection: Configure input voltage (24V, 48V, or 125V) to match field device outputs.

3. Output Configuration: Configure sourcing or sinking per channel to match field device wiring.

4. Current Verification: Ensure each output channel’s load does not exceed 500mA.

5. Scan Time: Ensure < 5ms scan time meets your response time requirements.

6. Wiring: Use appropriate gauge wiring for current loads.

7. ESD Handling: Use ESD-safe practices.

8. Sourcing: Obsolete. Request functional test report including all 32 inputs and 32 outputs tested, plus logic functionality verification.

9. Spare Strategy: Keep one spare GE DS3800HDDL1A1A on-site for critical logic applications. Ensure the spare is pre-programmed with your site’s logic before installation. If higher isolation or extended temperature range is required, consider later revisions.