2.1 General

• Part Number: 405A720H03

• Manufacturer: Westinghouse / Emerson

• Product Type: Industrial Power Supply Module

• Compatible Systems: WDPF DCS, Ovation DCS

• Revision: H03 (latest field revision)

• Status: Obsolete (EOL)；available as NOS (New Old Stock) or refurbished

• Warranty: 12 months (refurbished)；24 months (NOS)

2.2 Electrical

• Input Voltage: 100–240 VAC (±10%), 50/60 Hz (auto‑ranging)

• Input Power: 300 VA max

• Output Voltage: +5 VDC, ±12 VDC (Multibus standard)

• Output Current:

  • +5 VDC: 20 A (100 W)

  • +12 VDC: 5 A (60 W)

  • −12 VDC: 2 A (24 W)

• Regulation: ±0.5% (full load)

• Ripple & Noise: < 50 mV p‑p

• Protection: Overvoltage (OVP), overcurrent (OCP), short‑circuit (SCP), overtemperature (OTP)

2.3 Physical

• Dimensions (W×H×D): 305 mm × 203 mm × 25 mm (12.0 in × 8.0 in × 1.0 in) – standard 6U DCS module

• Weight: ≈ 1.2 kg (2.6 lb)

• Mounting: 12‑slot Multibus chassis (405A675G / 405A685G series)

• Connectors: Multibus edge connector (backplane), AC input terminal block

• Coating: Conformal coated (dust, moisture, corrosion resistance)

2.4 Environmental

• Operating Temperature: 0 °C to +55 °C (32 °F to 131 °F)Westinghouse

• Storage Temperature: −40 °C to +85 °C (−40 °F to 185 °F)

• Relative Humidity: 5% to 95% (non‑condensing)Westinghouse

• Shock/Vibration: IEC 60068‑2‑6 compliant (industrial grade)

• MTBF: > 100,000 hours (25 °C, full load)

3. Main Features

1. Wide‑Range AC Input

   • Auto‑ranging 100–240 VAC eliminates need for voltage selection switches; global compatibility.

2. High Efficiency & Low Heat

   • Active power factor correction (PFC) reduces energy consumption; efficiency > 85% at full load.

3. Hot‑Swap & Redundancy Ready

   • Supports online replacement in redundant Ovation/WDPF chassis; no system shutdown required.

4. Comprehensive Protection

   • OVP/OCP/SCP/OTP safeguards against electrical faults; automatic shutdown with fault logging.

5. LED Diagnostic Indicators

   • Front‑panel LEDs for power, output, and fault status; rapid troubleshooting.

6. Robust Industrial Design

   • Conformal coating, vibration resistance, and extended temperature range for 24/7 operation.

4. Applications

• Power Generation: Thermal, nuclear, combined‑cycle plants (WDPF/Ovation DCS).

• Process Industries: Petrochemical, pulp & paper, cement, water treatment, pharmaceutical.

• DCS Migration & Maintenance: Replaces aging power supplies in legacy Multibus chassis; extends system lifespan.

• Industrial Control Rooms: Powers PLCs, operator workstations, and remote I/O panels.

5. Comparison with 405A720H01/H02

6. Installation Instructions

6.1 Pre‑Installation Safety

• ESD Protection: Use an ESD wristband when handling; avoid static‑sensitive areas.

• Power Off: Shut down the chassis; disconnect AC input; wait 5 minutes for capacitors to discharge.

• Inspection: Check for bent pins, burnt components, or damaged connectors.

6.2 Installation Steps

1. Locate Slot: Select an available 6U Multibus slot in the 405A675G/685G chassis.

2. Insert Module: Align with chassis guides; insert firmly until fully seated.

3. Secure Module: Tighten front‑panel screw for grounding and stability.

4. Connect AC Input: Wire 100–240 VAC to the terminal block (L/N/PE).

5. Power On: Reconnect AC; verify LEDs: PWR (Green) ON, OUT (Yellow) ON.

6. Verify Output: Measure +5 VDC (±0.5%) and ±12 VDC at backplane connectors.

7. LED Indicators

8. Maintenance & Troubleshooting

8.1 Preventive Maintenance (Quarterly)

• Visual Inspection: Check connectors for dirt/corrosion; verify wiring tightness.

• Cleaning: Use dry, low‑pressure air (≤ 2 bar) to clean vents and components.

• Load Test: Verify output voltages under full load; compare to specs.

8.2 Troubleshooting

• PWR LED OFF: Check AC input, fuse, and terminal block wiring.

• OUT LED OFF: Check for short circuits in I/O modules; verify backplane voltage.

• FLT LED ON:

  1. Disconnect all loads; power on to test if fault persists.

  2. If fault clears, reconnect loads one by one to isolate faulty module.

  3. If fault remains, replace 405A720H03.

• Blinking FLT LED: Ensure chassis fans are operational; clear blocked vents.

9. Storage & Handling

• Packaging: Store in original anti‑static bag; keep in cool, dry area.

• Temperature: −40 °C to +85 °C; avoid direct sunlight and heat sources.

• Handling: Hold by edges only; avoid touching components or connectors.

10. Disclaimer