General Information

• Brand: Westinghouse (Emerson Electric)
• Model: 1C31227G01
• Product Type: 24V DC Isolated Power Supply Module (for Ovation DCS I/O systems)
• System Compatibility: Exclusively compatible with Emerson Ovation DCS (supports Ovation 3.x to 6.x software versions) and Ovation I/O modules (e.g., 1C31132G01, 1C31194G03, 1C31224G01).
• Core Function: Converts AC input power to regulated 24V DC output, with electrical isolation between input and output. Supplies power to I/O modules’ signal circuits and field sensors/actuators, preventing ground loops and noise interference.

Technical Specifications

1. Electrical Performance

• Input Voltage:
  • AC input: 100–240 V AC (50/60 Hz, universal input range) – compatible with global power grids.
  • DC input (optional): 120–370 V DC (for DC-powered industrial environments, e.g., offshore platforms).
• Output Voltage: Regulated 24 V DC ±2% (no-load to full-load), with ripple voltage <50 mV (peak-to-peak) – ensures stable power for sensitive I/O circuits.
• Output Current:
  • Continuous output: 5 A (max) – sufficient to power up to 8 Ovation I/O modules (typical 0.5–1 A per module).
  • Surge current: 10 A (peak, 100 ms) – handles temporary current spikes from field device startup.
• Isolation:
  • Input-to-output isolation: 2.5 kVrms (per IEC 61010-1) – protects DCS components from input-side voltage surges.
  • Output-to-chassis isolation: 1 kVrms – prevents ground loops between field devices and DCS.
• Efficiency: ≥85% (at full load, 230 V AC input) – reduces power loss and heat generation.

2. Protection Features

• Overcurrent Protection: Self-resetting current limit (6 A ±10%) – shuts down output temporarily if current exceeds safe levels, then auto-recovers after fault clearance.
• Overvoltage Protection: Clamps output voltage at ≤28 V DC – prevents damage to I/O modules from voltage spikes.
• Short-Circuit Protection: Latching short-circuit shutdown – deactivates output if output terminals are shorted; requires manual reset (via front-panel switch) to restore power.
• Over-temperature Protection: Thermal shutdown at 85°C (185°F) – protects internal components from overheating (e.g., in high-temperature cabinets).
• Input Surge Protection: 2 kV (line-to-line) surge suppression – withstands transient voltage from power grid fluctuations.

3. Physical & Environmental Specifications

• Dimensions: 152.4 mm (W) × 101.6 mm (H) × 38.1 mm (D) [6.0” × 4.0” × 1.5”] – fits Ovation DCS 1U rack spaces.
• Mounting: 19-inch rack-mounted (supports standard Ovation control cabinets); no additional brackets required.
• Operating Temperature: -10°C to 60°C (14°F to 140°F) (ambient, non-condensing) – suitable for most industrial indoor environments.
• Storage Temperature: -40°C to 85°C (-40°F to 185°F) – no special storage conditions for spare units.
• Humidity: 5%–95% RH (non-condensing) – resistant to moisture in chemical or wastewater facilities.
• Vibration Resistance: 5 g (10–500 Hz) per IEC 60068-2-6 (sinusoidal); 10 g (100–2000 Hz) per IEC 60068-2-27 (random) – withstands machinery vibration.
• Protection Class: IP20 (front panel) – designed for enclosed cabinets (prevents dust ingress; not waterproof).

4. Safety & Compliance

• Certifications:
  • CE (EN 61326-1 for EMC, EN 60950-1 for safety) – no interference with DCS components, meets European safety standards.
  • UL 508 (industrial control equipment) – compliant for North American industrial use.
  • CSA C22.2 No. 14 (Canadian safety standard) – meets Canadian electrical codes.
• EMC Emissions: Complies with EN 55011 Class A – suitable for industrial environments (not for residential areas).

Key Features

1. Universal Input: 100–240 V AC (50/60 Hz) input works with global power supplies, eliminating the need for region-specific variants and simplifying inventory.
2. High Isolation: 2.5 kVrms input-output isolation prevents ground loops and noise transfer between the power grid and DCS I/O circuits – critical for accurate analog signal measurement.
3. Reliable Protection: Comprehensive overcurrent, overvoltage, short-circuit, and over-temperature protection safeguards both the power supply and connected I/O modules, reducing downtime from electrical faults.
4. Easy Monitoring:

• Front-panel LEDs: Green (power on), Red (fault) – provides clear visual status (e.g., red LED indicates short-circuit or over-temperature).
• Manual reset switch: For restoring power after latching faults (e.g., short-circuit) – no need to power cycle the entire DCS rack.

5. DCS Integration: Communicates with the Ovation controller via backplane – sends fault status (e.g., overcurrent) to the DCS for remote monitoring and alarm logging.
6. Redundancy Support: Can be configured in 1+1 redundant pairs (two modules powering the same I/O rack) – auto-switchover if one module fails, ensuring uninterrupted power for critical systems.

Applications

• Power Generation: Powers Ovation I/O modules monitoring turbine sensors, boiler pressure transmitters, and generator controls – stable power ensures accurate data for load balancing.
• Chemical & Petrochemical: Supplies power to I/O modules connected to reactor temperature sensors, valve actuators, and emergency shutdown (ESD) devices – isolation prevents noise from affecting safety-critical signals.
• Water & Wastewater: Powers field sensors (flow meters, level transmitters) and I/O modules in treatment plants – withstands humid environments and power grid fluctuations.
• Manufacturing: Provides power to I/O modules controlling robotic arms, conveyor systems, and quality inspection sensors – reliable protection prevents downtime from electrical faults.

Documentation & Support

• Technical Manual: Emerson Ovation 1C31227G01 Isolated Power Supply Installation Guide (Document No. 1C31227G01-01) – available via Emerson’s official support portal, including wiring diagrams and redundancy setup instructions.
• Compatibility List: Refer to Emerson’s Ovation Power Supply & I/O Module Compatibility Matrix (Document No. 8900-0015) to confirm pairing with specific I/O modules.
• Spare Parts: No user-serviceable components; spare units are recommended for critical systems (part number: 1C31227G01).

Ordering Information

• Base Model: 1C31227G01 (24V DC, 5A, universal AC input, standard version).
• Optional Accessories:
  • Redundancy kit (1C31227G01-RK): Includes redundant power distribution board and cabling for 1+1 redundancy.
  • Rack mounting ears (1C31227G01-MT): For non-Ovation standard racks (if needed).
• Lead Time: Typically 2–4 weeks for standard orders; 1 week for emergency spares (via Emerson’s authorized Ovation DCS distributors).