Technical Specifications

• Model: 405A497H01

• Manufacturer: Emerson (Westinghouse)

• System Compatibility: Ovation™ DCS, WDPF DCS

• Function: Isolated DC/DC power supply (auxiliary)

• Input Voltage: 85–264 VAC (universal), 50/60 Hz; 120–370 VDC

• Output Voltage: 24 VDC ±1% (adjustable 22–26 VDC)

• Output Current: 6 A continuous, 8 A peak

• Power Rating: 144 W

• Efficiency: ≥ 90% (full load, 230 VAC input)

• Isolation: 2,500 VAC input-to-output

• Protection: Overvoltage, overcurrent, short-circuit, overtemperature, surge/EMI filtering

• Operating Temperature: 0 °C to +60 °C

• Storage Temperature: −40 °C to +85 °C

• Relative Humidity: 5%–95%, non-condensing

• Installation: Standard 35 mm DIN rail mount

• Dimensions: ~120 × 85 × 50 mm

• Weight: ~1.2 kg

• Certifications: CE, UL, RoHS compliant

• Key Features: Hot-swappable, redundant parallel operation, compact design, enhanced diagnostics

Application Fields

• Power Generation: Ovation/WDPF DCS auxiliary power, remote I/O node supply, redundant power for power plant control rooms.

• Process Industries: Petrochemical, pulp & paper, cement — 24 VDC distribution for field sensors, actuators, and remote I/O modules.

• Water Treatment: SCADA system auxiliary power, sensor/valve supply, redundant power for wastewater treatment plants.

• Critical Infrastructure: Industrial environments requiring compact, high-reliability isolated 24 VDC auxiliary power.

Installation & Wiring

1. Pre-Installation: Disconnect all AC/DC power; ensure DIN rail is properly grounded.

2. Mounting: Snap module onto a standard 35 mm DIN rail and lock in place.

3. AC Input: Connect 85–264 VAC to L/N/PE terminals; use 16–18 AWG wire.

4. DC Output: Connect 24 VDC to +24V/COM terminals; observe polarity.

5. Redundancy: For parallel redundancy, connect +24V terminals together and COM terminals together; enable current sharing.

6. Grounding: Connect chassis ground to system earth for ESD/EMI protection.

Operation & Diagnostics

• PWR (Green): Output voltage normal.

• AC OK (Green): AC input present and within range.

• FAULT (Red): Overvoltage, overcurrent, short circuit, or overtemperature.

• Monitoring: Output voltage/current can be monitored via Ovation workstation tools or local test points.

Maintenance & Safety

• Maintenance: Inspect connections and terminals periodically; keep ventilation slots clear.

• Safety: Disconnect all power before servicing; allow 5 minutes for capacitors to discharge.

• Operating Limits: Do not exceed rated input/output voltage/current; keep within temperature/humidity ranges.

Product Status

• Current Status: Active production; new original and refurbished spares available.

• Compatibility: Fully interoperable with all Ovation/WDPF DCS releases; compact alternative to 405A431G series.