Key Specifications

• Model: 405A685G61

• 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): approx. 483 × 133 × 280 mm

• Weight: approx. 4.5 kg

• Status: Obsolete (EOL)；available as NOS or refurbished

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

Main Features

• 12‑slot high‑density design – flexible system configuration for up to 12 modules.

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

• Integrated 115 VAC power – powers backplane and modules, reduces external wiring.

• Rugged industrial construction – heavy‑duty metal chassis with card guides and EMI shielding.

• Hot‑swap capable – modules can be inserted/removed online (system‑dependent).

• Full legacy compatibility – works with WDPF/Ovation hardware for 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

• 405A685G61: 12‑slot MultiBus chassis (115 VAC, current model variant)

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

• 405A675G33/G61/G62/G63/G64: 12‑slot MultiBus chassis (older revisions)

Installation (Manual Excerpt)

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

2. Connect 115 VAC power to the chassis inlet.

3. Insert modules into slots 1–12; ensure full seating and locking.

4. Verify module LEDs: green = power OK.

Maintenance

• Quarterly Inspection: Check backplane connectors for dirt/corrosion; verify module seating and fastener 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)

• Green (Power): ON = normal power.

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

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