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GE WESDAC D20C Remote Terminal Unit Controller
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- Part Number: WESDAC D20C
- Brand: General Electric
- Type: Remote Terminal Unit Controller
- Dimensions: 4x18.5x12.7cm
- Country of Origin: USA
- Barcode: 8537101190
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Additional Specifications
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Product Description
The GE WESDAC D20C, also cataloged as the D20C Remote Terminal Unit Controller, operates as a dedicated hardware component for localized analog data acquisition and discrete control output execution within WESDAC industrial substation automation systems.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | D20C |
| Brand | GE (General Electric / Wescom) |
| Series | WESDAC / D20 Series |
| Origin | United States (US) |
| Weight | Standard WESDAC rack-slot allocation metrics |
| Dimensions | 19" x 5.25" x 2.5" (Standard rack-mount assembly) |
| Operating Temp | -20 to +60 deg C (-4 to +140 deg F) standard engineering envelope |
| Power Requirements | Typical: 20-60 VDC, 5 W / Full Load: 11 W with 24 VDC contact wetting |
| Processor Hardware | 8-bit Freescale 68HC11 Microprocessing Unit (MPU) |
| Clock Speed | 2 MHz MPU clock |
| On-Board Memory | 24 KB EPROM, 32 KB static RAM, 512 bytes EEPROM |
| Analog Inputs | 16 bipolar, differential inputs via plug-in daughter board |
| A/D Resolution | 14 bits plus sign |
| Conversion Rate | 275 ms for 16 inputs @ 60 Hz / 328 ms for 16 inputs @ 50 Hz |
| Control Outputs | 8 relays plus 2 Master Trip/Close relays (Configurable Form C loops) |
| Contact Ratings | 60 W max, 3 A max, 220 VDC max potential |
| Isolation Ratings | 1500 Vrms component isolation / 1000 VDC dielectric rating |
| Communication Ports | 2 dedicated D.20 Link ports, 1 RS-232 maintenance port (9600 baud) |
GE Industrial Control and Process Coordination
- 4-20 mA HART Loop Protocol and Signal Conversion: The plug-in daughter board utilizes a 14-bit plus sign analog-to-digital converter matrix to interface directly with differential field instruments. Operating with a temperature coefficient of +/- 10 ppm per deg C, it manages voltage loop conversions at +/- 0.05% accuracy and current loop arrays at +/- 0.1% accuracy, sustaining a dynamic range up to 125% of normalized full-scale inputs.
- Loop Integrity Tracking: The control output stage performs automated hardware validation sequences to secure the field relay matrix. The internal logic executes a coil status check every 500 microseconds across the active trip/close configurations, checking circuit continuity and preventing uncommanded switch operations before verifying programmable pulse timing variables (1 ms to 215 s boundaries).
Frequently Asked Questions
Q: What physical defense mechanism does the D20C implement to inhibit external control execution during local maintenance windows?
A: The module is equipped with a physical, front-panel local enable/disable toggle switch. Activating this manual hardware interlock opens a downstream break in the master relay driver circuit, instantly isolating the 8 internal control relays and the 2 Master Trip/Close coils from remote system execution commands without disrupting the 16 analog input acquisition loops.
Q: How does the module react to common-mode electrical surges running across the differential analog input wiring?
A: The input subsystem relies on an integrated galvanic isolation boundary rated up to 1500 Vrms component isolation and 1000 VDC dielectric resistance. This physical barrier stops high-voltage substation transients from breaching the internal 2 MHz Freescale microprocessor logic, grounding inductive spikes before they can corrupt the active RAM and EEPROM registers.
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