Key Specifications

• Model: 405A675G61

• Manufacturer: Westinghouse / Emerson

• Compatible Systems: WDPF, Ovation DCS

• Type: 12‑slot MultiBus chassis (backplane assembly)

• Slot Count: 12 module positions

• Backplane: MultiBus parallel bus, high‑speed inter‑module communication

• Input Power: 115 VAC (integrated power supply)

• Mounting: Standard 19” industrial rack

• Dimensions (W×H×D): ~483 × 133 × 280 mm

• Weight: ~4.5 kg

• Status: Obsolete (EOL)；available as new old stock (NOS) or refurbished

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

Main Features

• 12‑slot high‑density design: Accommodates up to 12 DCS modules for flexible system configuration.

• MultiBus backplane: Ensures reliable, high‑speed data exchange between controllers and I/O modules.

• Integrated AC power: 115 VAC input powers the backplane and installed modules, reducing external wiring.

• Rugged industrial construction: Heavy‑duty metal chassis with card guides and EMI shielding for harsh environments.

• Hot‑swap capable: Modules can be inserted/removed online (system‑dependent) without shutdown.

• Full compatibility: Works with legacy WDPF and Ovation DCS hardware for easy maintenance and migration.

Applications

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

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

• DCS Maintenance & Spares: Replacement chassis for existing WDPF/Ovation DCS installations.

Related Models

• 405A675G21: 4‑slot power supply chassis (24 VDC, 10 A).

• 405A675G33: 12‑slot MultiBus chassis (similar to 405A675G61, different revision).

• 405A672H01: DIN‑rail mounted 24 VDC power supply.

Installation & Maintenance (Excerpt from Manual)

Installation

1. Mount the chassis to a standard 19” rack using 4 screws (front panel).

2. Connect 115 VAC power to the chassis inlet.

3. Insert modules into slots 1–12, ensuring proper seating and locking.

4. Verify all module LEDs illuminate as expected (green = power OK).

Maintenance

• Quarterly Inspection: Check backplane connectors for dirt/corrosion; verify module seating and screw tightness.

• Cleaning: Use dry, low‑pressure compressed air to blow dust from slots and connectors.

• Safety: Disconnect AC power before servicing; wait 5 minutes for capacitors to discharge.

LED Indicators (on Modules, not Chassis)

• Green (Power): On = module powered normally.

• Red (Fault): On = backplane/module fault (overvoltage, overcurrent, communication error).

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