2. Basic Information

• Model Number: 405A975G01

• Brand: Westinghouse / Emerson

• Type: DCS Power Supply Module (Backplane & System Power)

• Applicable Systems: Ovation™ DCS, legacy WDPF DCS

• Origin: United States

• Weight: Approx. 1.6 kg

• Form Factor: Standard Ovation/WDPF slide-in card

• Warranty: 12 months (new/refurbished)

• Certifications: Emerson factory tested, CE, EMC, IEC 61010 compliant

3. Key Functions

1. Backplane Power Distribution: Supplies stable DC power to all rack modules (controllers, I/O, communication cards).

2. Isolation & Regulation: Provides galvanic isolation and tight voltage regulation to protect sensitive DCS electronics from noise/spikes.

3. Redundancy Support: Works in 1+1 redundant configs with auto-failover for uninterrupted power.

4. Overload/Short-Circuit Protection: Built-in current limiting and shutdown to prevent module/backplane damage.

5. Health Monitoring: Onboard LEDs and fault logging for real-time status and troubleshooting.

6. Wide Input Compatibility: Accepts industrial AC/DC inputs for flexible cabinet integration.

4. Technical Specifications

4.1 Electrical

• Input Voltage: 85–264 VAC (47–63 Hz) / 120–370 VDC

• Output Voltage: 24 VDC (regulated, ±1%)

• Output Power: 150 W (continuous)

• Efficiency: ≥85% (full load)

• Isolation: 1500 VAC (input ↔ output)

• Protection: Overvoltage, overcurrent, short-circuit, overtemperature

4.2 Environmental

• Operating Temp: 0 °C to +55 °C

• Storage Temp: -25 °C to +70 °C

• Relative Humidity: 5%–95% (non-condensing)

• Vibration: IEC 60068-2-6 compliant (industrial grade)

4.3 Mechanical

• Dimensions: Standard Ovation/WDPF module size

• Mounting: Slide-in, front-locking latch

• Cooling: Forced air (internal fan)

• Coating: Conformal coated for dust/moisture resistance

5. Compatibility & Replacement

• Direct Replacements: 405A975G02 (updated firmware)

• Compatible With: All Ovation/WDPF racks; pairs with 405A973H01 (processor) and 405A924Gxx (communication) modules.

6. Applications

• Power Generation: Thermal, combined-cycle, nuclear plants (Ovation/WDPF)

• Petrochemical: Refineries, gas processing, chemical plants

• Heavy Industry: Pulp & paper, mining, cement, metallurgy

• Water Treatment: Large municipal/industrial water/wastewater facilities

7. LED Indicators

• AC IN (Green): On = AC input OK; Off = no input

• DC OUT (Green): On = 24 VDC output stable; Flashing = overload

• FAULT (Red): On = overtemperature/short circuit; Flashing = fan failure

• REDUND (Blue): On = redundant partner active

8. Installation & Safety

1. Power Off: Disconnect cabinet AC before insertion/removal.

2. ESD Protection: Use anti-static wristband/mat.

3. Insertion: Align with slot guides; push until latch clicks.

4. Wiring: Connect AC input per local codes; torque terminals to specs.

5. Grounding: Connect module ground to cabinet earth (<1 Ω).

6. Power-Up: Restore AC; verify LEDs; check output voltage via meter.

9. Maintenance & Troubleshooting

• Routine Checks: Inspect LEDs, fan airflow, and connections quarterly; clean fan filters semi-annually.

• Common Issues:

  • No DC OUT: Check AC input, fuse, and wiring.

  • FAULT Light On: Clear air vents; check for short circuits on backplane.

• Firmware: Update via Emerson tools; match redundant module firmware.

10. Ordering Information

• Part Number: 405A975G01

• Category: DCS Spare Parts → Ovation/WDPF → Power Supply Modules

• Availability: New original and tested refurbished units in stock

• Lead Time: 1–3 days (in stock); 2–4 weeks (special order)

• Order Note: Specify rack serial number and redundancy config for compatibility.