Product Description
GE WESDAC D20A‑D‑L‑U‑U‑S‑U‑7‑U is a distributed analog input I/O module for WESDAC D20 RTU system. It works in pair with WESTERM D20A termination base. Up to 32 differential analog input channels are configurable for voltage or current signals. On‑board surge suppression and over‑voltage protection are provided for field inputs. It communicates to D20 main processor via D.20 Link bus, performs analog‑to‑digital conversion and transmits acquired field data to host CPU. Conformal coated hardware is designed for high‑noise substation environments. It is critical spare I/O component for D20 remote terminal units. OEM manufacturing has been ended; only used / refurbished spares available on marketNordwel El….
Technical Specification
| Item | Specification |
|---|---|
| Full Model | D20A‑D‑L‑U‑U‑S‑U‑7‑U (WESDAC D20A) |
| Module Type | Distributed Analog Input I/O Module |
| Matching Base | WESTERM D20A field termination module |
| Analog Input Channels | Max.32 differential channels, software‑configurable voltage/current |
| Voltage Input Ranges | ±1V / ±2.5V / ±5V / ±10V |
| Current Input Ranges | ±1mA ~ ±20mA (shunt sampling) |
| Resolution | 14‑bit plus sign bit |
| Accuracy | Voltage ±0.05%FS; Current ±0.1%FS |
| Communication | D.20 Link DB9 daisy‑chain bus; WESMAINT RS232 maintenance port |
| Dielectric Isolation | 1500 Vrms |
| Over‑voltage Rating | 35VDC continuous, 200Vpp transient |
| Power Supply | Powered over D.20 Link bus, typical 7W |
| Operating Temperature | -20℃ ~ +60℃ |
| Protection | Conformal coating, built‑in surge withstand for field inputs |
| Mounting | Rack‑mounted, assembled together with WESTERM termination base |
| Product Status | OEM End‑of‑Manufacturing; spare‑parts only |
Application
- Substation RTU Tele‑metry: Expand analog measuring points for D20 Remote Terminal Units; acquire transmitter signals and send tele‑metry data to SCADA host.
- Power Plant & Substation Monitoring: Collect process analog signals for power generation and distribution stations for transformer & bus‑bar condition monitoring.
- Oil & Gas SCADA: Acquire pressure & temperature transmitter signals for pipelines and compressor stations with D20 RTU for remote supervisory control.
- Industrial Process Monitoring: Distributed I/O signal acquisition for heavy‑industry sites under severe electromagnetic interference.
- Maintenance & Spare Replacement: Replace defective I/O modules on existing D20 RTU installations to keep legacy substation systems continuously operational.
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