WESDAC D20C

Description

1. Product Description

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

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

• 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.

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

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.