Description

🏭 Real-World Application Scenario

At a combined-cycle power plant in Texas, a single-point power failure once caused a full trip of the HRSG (Heat Recovery Steam Generator) due to loss of 24VDC to relay logic. To eliminate this risk, engineers retrofitted the control panel with dual Woodward 9907-1200 power supplies in redundant configuration. During a subsequent utility disturbance, one PSU failed due to a capacitor degradation—but the second unit instantly assumed 100% load without voltage sag. Operators received a “PSU Fault” alarm via the HMI and replaced the faulty unit during routine maintenance. Zero process interruption was achieved, and the plant now meets ISO 55000 asset reliability standards.

💡 Technical Innovations & Value

Innovation 1: Integrated ORing diodes eliminate the need for external redundancy modules, reducing cost, space, and failure points.

Innovation 2: Dual AC/DC input capability allows deployment in both standard grid-powered panels and battery-backed DC systems (common in substations).

Innovation 3: Fanless design ensures silent, maintenance-free operation in environments where dust, moisture, or explosive gases prohibit moving parts.

Innovation 4: Tight output regulation (<2% ripple) protects sensitive Woodward I/O modules (e.g., 9905-1616 DO cards) from noise-induced faults.

🌐 Typical Applications

Gas & Steam Turbine Control (MicroNet Plus, SLC)

Generator Synchronization & Protection (EasyGen 3000/3500)

Marine Propulsion Systems (diesel-electric drives)

Oil & Gas Compression Stations

Hydroelectric Power Plants

Industrial Backup Power (UPS interface)

🔗 Related Products & System Integration

Woodward 9907-1201: Higher-current variant (15 A / 360 W)

Woodward 9905-1616: 16-channel digital output module (powered by 9907-1200)

Woodward 9905-1608: 8-channel analog input module

Woodward EGCP-3: Engine-generator control panel (uses 9907 series PSUs)

Woodward SLC: Simple Logic Controller – often paired with redundant 9907-1200

ABB AC 800M / Siemens S7: Can coexist in hybrid plants using Woodward PSUs for local I/O

🔧 Installation & Maintenance

Installation: Mount on DIN rail, connect AC/DC input, link outputs in parallel for redundancy

Wiring: Use 10–14 AWG for 10 A output; torque terminals to spec (typically 0.6 Nm)

Diagnostics: Monitor “DC OK” LED; consider adding external voltmeter for preventive checks

Maintenance: No scheduled service; inspect annually for dust buildup (in non-hazardous areas)

⚠️ Warning: Do not mix 9907-1200 with non-ORing power supplies in redundant setups—this can cause reverse current flow and damage.

✅ Quality & Support

We supply 100% new, factory-original Woodward 9907-1200 power supplies with:

Full manufacturer warranty (typically 2 years)

Traceable serial numbers and compliance certificates

Pre-shipment testing (output stability, redundancy switchover, thermal performance)

Global shipping with protective packaging

📞 Need help designing a redundant power architecture for your Woodward system?

Contact us for engineering support, compatibility verification, or bulk pricing on 9907-1200 and related control components. Ensure your turbine, generator, or propulsion system never loses power again.