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WESDAC D20C
WESDAC D20C
WESDAC D20C

GE WESDAC D20C

  1. Modular Design:
    • The detachable Western D20C termination board simplifies field wiring, while the WESDAC D20C handles signal processing and communication.
    • Optional analog daughter boards allow customization for specific applications (e.g., temperature monitoring or valve control).
  2. Reliability:
    • Built-in surge protection (MOVs) and noise filters reduce unplanned outages by up to 35% in high-interference environments.
    • Industrial-grade components (e.g., red-coated diodes) ensure stability in extreme temperatures and vibrations.
  3. Flexible Configuration:
    • Jumper switches and DIP switches enable custom signal mapping and address assignment.
    • Supports dual D.20 Link ports for daisy-chaining multiple modules or redundant system setups.
  4. Efficient Processing:
    • 8-bit Freescale 68HC11 MPU with 2 MHz clock speed ensures real-time control with minimal latency.
    • 32 KB SRAM and 24 KB EPROM provide ample memory for complex logic and data storage.
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Part number: WESDAC D20 C
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Description

1. Product Description

The D20C consists of two detachable components: the Western D20Ctermination board for field wiring and the WESDAC D20C module for signal processing and communication with the D20 processor. It supports up to 16 digital inputs (12–130 VDC), 8 relay outputs (3 A max), and optional analog channels (16 analog inputs or 8 analog inputs/outputs). Key features include surge protection, noise filtering, and dual D.20 Link ports for high-speed data exchange. The module’s 8-bit Freescale 68HC11 MPU (2 MHz clock speed) ensures real-time control with minimal latency, while 24 KB EPROM and 32 KB SRAM provide ample memory for complex logic.

2. Product Parameters

Parameter Specification
Function Analog/digital I/O processing for industrial control
Compatibility GE D20/D200 substation control systems
Digital I/O 16 inputs (12–130 VDC), 8 relay outputs (3 A max)
Analog I/O (Optional) 16 bipolar inputs (±35 VDC, 14-bit resolution) or 8 inputs/outputs (0–20 mA, 12-bit)
Communication RS-232 (9600 baud) for maintenance, D.20 Link for system integration
Power Requirements 20–60 VDC, 5 W typical / 11 W full load
Dimensions 19″ x 5.25″ x 2.5″ (assembly)
Operating Temperature -40°C to +70°C
Redundancy Supports dual-channel configuration (TMR-ready)
WESDAC D20C

WESDAC D20C

3. Advantages and Features

  1. Modular Design:
    • The detachable Western D20C termination board simplifies field wiring, while the WESDAC D20C handles signal processing and communication.
    • Optional analog daughter boards allow customization for specific applications (e.g., temperature monitoring or valve control).
  2. Reliability:
    • Built-in surge protection (MOVs) and noise filters reduce unplanned outages by up to 35% in high-interference environments.
    • Industrial-grade components (e.g., red-coated diodes) ensure stability in extreme temperatures and vibrations.
  3. Flexible Configuration:
    • Jumper switches and DIP switches enable custom signal mapping and address assignment.
    • Supports dual D.20 Link ports for daisy-chaining multiple modules or redundant system setups.
  4. Efficient Processing:
    • 8-bit Freescale 68HC11 MPU with 2 MHz clock speed ensures real-time control with minimal latency.
    • 32 KB SRAM and 24 KB EPROM provide ample memory for complex logic and data storage.

4. Application Areas and Use Cases

Industries:
  • Power Generation: Substation automation, turbine control, and grid monitoring.
  • Oil & Gas: Pipeline SCADA systems, compressor stations, and refinery processes.
  • Manufacturing: Motor control centers, conveyor systems, and quality assurance.
Use Case:
A 300 MW gas-fired power plant in the Middle East uses the D20C to interface 16 temperature sensors and 8 valve actuators with the D20 control system. The module’s surge protection reduced downtime by 35% over five years, while its modular design simplified expansion during plant upgrades.

5. Competitive Comparison

Feature D20C Alternative Solutions
Analog Precision 14-bit resolution (analog inputs) 12-bit typical
Redundancy Built-in dual-channel support Requires external modules
Signal Conditioning Integrated surge protection Optional add-ons
Legacy Compatibility Direct replacement for D20/D200 systems Requires adapters
Cost Efficiency Refurbished units available at 40% cost New units only
WESDAC D20C

WESDAC D20C

6. Selection Recommendations

  1. System Compatibility:
    • Verify integration with D20/D200 processors (e.g., D20M++, D20ME) and power supply modules (DS200PWR01AAA).
    • Avoid mixing revisions (e.g., Rev A vs. Rev D) due to potential backward incompatibility.
  2. Environment:
    • For offshore or high-vibration settings, pair with GE’s IP66-rated enclosures and shock mounts.
    • Ensure proper grounding to prevent ESD damage.
  3. Maintenance Strategy:
    • Source refurbished units from certified suppliers with 1–3 year warranties.
    • Schedule annual inspections of connectors and solder joints.
  4. Future-Proofing:
    • Consider migrating to GE’s Mark VIe or PACSystems RX3i for advanced features (e.g., Ethernet/IP, IoT integration).

7. Precautions and Best Practices

  1. Installation:
    • Use anti-static wrist straps during handling and secure the module in a grounded chassis with 10 cm clearance for airflow.
    • Follow GE’s wiring guidelines to avoid short circuits.
  2. Configuration:
    • Use GE’s D20 Config Pro software for signal mapping and diagnostics.
    • Validate D.20 Link termination resistors (120 Ω) to prevent signal reflections.
  3. Troubleshooting:
    • Check LED indicators: Green = normal operation; Amber = signal fault.
    • Replace failed components (e.g., MOVs, relays) with GE-certified parts.

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