Yokogawa PW481-50 S2

¥999.00

Yokogawa PW481-50 S2 is a high-capacity, redundant power supply module engineered for Yokogawa CENTUM VP DCS and ProSafe-RS SIS, delivering reliable 24V DC power to large-scale control systems and safety loops in critical industrial environments. As an upgraded variant of the PW481 series, Yokogawa PW481-50 S2 offers enhanced power density, efficiency, and diagnostic capabilities, making it a cornerstone for oil refineries, LNG plants, power generation facilities, and chemical manufacturing sites. In a petrochemical complex’s central control room, Yokogawa PW481-50 S2 powers redundant CENTUM VP controller racks to ensure uninterrupted process monitoring; in a nuclear power plant’s auxiliary systems, Yokogawa PW481-50 S2 supplies stable power to ProSafe-RS safety modules; in an LNG liquefaction plant, Yokogawa PW481-50 S2 supports high-density I/O racks for cryogenic process control. Additionally, Yokogawa PW481-50 S2 features hot-swappable redundancy and advanced fault detection, minimizing downtime and simplifying maintenance for 24/7 operations

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Description

1. Product Overview

Yokogawa PW481-50 S2 is a high-capacity, redundant power supply module engineered for Yokogawa CENTUM VP DCS and ProSafe-RS SIS, delivering reliable 24V DC power to large-scale control systems and safety loops in critical industrial environments. As an upgraded variant of the PW481 series, Yokogawa PW481-50 S2 offers enhanced power density, efficiency, and diagnostic capabilities, making it a cornerstone for oil refineries, LNG plants, power generation facilities, and chemical manufacturing sites. In a petrochemical complex’s central control room, Yokogawa PW481-50 S2 powers redundant CENTUM VP controller racks to ensure uninterrupted process monitoring; in a nuclear power plant’s auxiliary systems, Yokogawa PW481-50 S2 supplies stable power to ProSafe-RS safety modules; in an LNG liquefaction plant, Yokogawa PW481-50 S2 supports high-density I/O racks for cryogenic process control. Additionally, Yokogawa PW481-50 S2 features hot-swappable redundancy and advanced fault detection, minimizing downtime and simplifying maintenance for 24/7 operations.

2. Product Parameters

2.1 Core Power Specifications

  • Input Voltage: 100-240V AC (50/60Hz, universal input) or 120-370V DC (dual input support)
  • Output Voltage: 24V DC (adjustable ±1%), dual redundant output channels
  • Output Current: 20A per channel (40A total for 1+1 redundant configuration), 25A peak per channel (10s)
  • Efficiency: ≥94% (at full load), industry-leading for high-capacity DCS power supplies
  • Ripple & Noise: ≤20mV p-p (24V output), ensuring ultra-clean power for sensitive control electronics

2.2 Electrical & Protection Features

  • Redundancy: 1+1 hot standby with automatic switchover (<3ms transition time)
  • Protection Mechanisms: Overvoltage protection (27.6V DC max), overcurrent protection (24A min per channel), overheating protection (110°C shutdown), short-circuit protection (current-limiting, auto-recovery)
  • Isolation Rating: 4000V AC input-to-output, 2000V AC output-to-output, 500V AC output-to-ground
  • Power Factor Correction (PFC): Active PFC (≥0.98 at full load), compliant with EN61000-3-2 Class A
  • Diagnostic Signals: Digital status outputs (power OK, fault, redundancy status), LED indicators (per-channel power, fault, redundancy)

2.3 Environmental & Mechanical Parameters

  • Operating Temperature: -10°C to +60°C (derating 2% per °C above 55°C)
  • Storage Temperature: -25°C to +70°C
  • Relative Humidity: 5% to 95% (non-condensing), IP20 protection
  • Vibration Resistance: 5-2000Hz, 2g (IEC 60068-2-6, X/Y/Z axes)
  • Shock Resistance: 20g (11ms half-sine wave, IEC 60068-2-27)
  • Mounting: Yokogawa CENTUM VP/ProSafe-RS rack-mounted (6U height), hot-swappable plug-in module
  • Dimensions: 483mm (W) × 265mm (H) × 300mm (D), compatible with standard 19-inch control racks

2.4 Certifications & Compatibility

  • Safety Certifications: SIL 2 (IEC 61508), TÜV Rheinland, ATEX Zone 2 (Ex nA IIC T4)
  • Industry Certifications: CE, UL/cUL Class 1 Div 2, FCC Class A, RoHS, REACH
  • Compatibility: Yokogawa CENTUM VP CP401/CP402 controllers, ProSafe-RS SIS modules, Yokogawa high-density I/O racks (AAI841, ADV841)
  • MTBF: ≥600,000 hours (per Telcordia SR-332 standards)

3. Advantages & Features

  1. High-Capacity Redundancy: With 20A per channel and 1+1 hot standby, Yokogawa PW481-50 S2 powers large-scale DCS/SIS systems (up to 40A total load) with zero single points of failure, critical for facilities where power interruptions risk catastrophic process disruptions.
  2. Ultra-High Efficiency: At ≥94% efficiency, Yokogawa PW481-50 S2 reduces energy consumption and heat generation, lowering operational costs and extending the lifespan of adjacent rack components by minimizing thermal stress.
  3. Advanced Diagnostics & Monitoring: Digital status outputs and per-channel LED indicators provide real-time visibility into power supply health, while redundancy status alerts enable proactive maintenance before faults impact operations.
  4. Hot-Swappable Design: Yokogawa PW481-50 S2 supports hot-swapping in live systems, allowing module replacement without shutting down the DCS/SIS—essential for continuous production environments like refineries and LNG plants.
  5. Global Compatibility & Hazardous Area Compliance: Universal AC/DC input and ATEX Zone 2 certification make Yokogawa PW481-50 S2 suitable for deployment in global industrial sites, including hazardous locations where flammable atmospheres are present.

4. Application Fields & Cases

4.1 Application Fields

  • Oil & Gas: Refinery central control systems, LNG liquefaction plant SIS, offshore platform main DCS racks
  • Petrochemical: Ethylene plant process control systems, chemical reactor safety loops, large-scale storage terminal monitoring
  • Power Generation: Fossil fuel power plant boiler/turbine control systems, nuclear auxiliary safety systems, wind farm central SCADA
  • Chemical: Bulk pharmaceutical production control systems, hazardous material processing SIS, polymer plant DCS

4.2 Typical Cases

  1. Refinery Central Control System: A major European oil refinery deployed Yokogawa PW481-50 S2 to power its CENTUM VP central control system, supporting 35A of I/O and controller load across redundant channels. During a primary channel failure, the module’s <3ms switchover to standby ensured no disruption to refinery operations, avoiding an estimated $2M in potential downtime costs.
  2. LNG Liquefaction Plant SIS: An Australian LNG plant integrated Yokogawa PW481-50 S2 into its ProSafe-RS emergency shutdown system, powering high-density I/O racks monitoring cryogenic process temperatures and pressures. The module’s ATEX Zone 2 certification and low ripple noise (<20mV p-p) ensured reliable operation in hazardous, temperature-sensitive environments.
  3. Fossil Fuel Power Plant DCS: A U.S. coal-fired power plant used Yokogawa PW481-50 S2 to supply redundant power to its boiler and turbine control systems. The module’s 94% efficiency reduced annual energy costs by $15,000 compared to legacy power supplies, while overheating protection prevented a potential rack fire during a cooling system failure.

5. Competitive Comparison

Parameter Yokogawa PW481-50 S2 Competitor A (High-Capacity PSU) Competitor B (Non-Redundant PSU)
Output Capacity 20A/channel (40A total) 15A/channel (30A total) 40A (single channel)
Redundancy Switchover <3ms <10ms None
Efficiency ≥94% ≥88% ≥85%
SIL Certification SIL 2 SIL 1 None
Hot-Swappable Yes No No
MTBF ≥600,000 hours ≥400,000 hours ≥300,000 hours

6. Selection Suggestions & Precautions

6.1 Selection Suggestions

  1. System Scale & Redundancy: Choose Yokogawa PW481-50 S2 for large-scale DCS/SIS systems (≥20A load) requiring 1+1 redundancy (e.g., refineries, LNG plants); smaller PW401-S2 modules suit low-capacity applications, while non-redundant supplies are only for non-critical systems.
  2. Efficiency & Cost Goals: Opt for Yokogawa PW481-50 S2 to minimize energy costs and heat generation in high-capacity racks; legacy high-capacity supplies may be cheaper upfront but incur higher long-term operational costs.
  3. Hazardous Area Needs: Select Yokogawa PW481-50 S2 for ATEX Zone 2 hazardous locations; non-certified supplies are restricted to safe-area installations.

6.2 Precautions

  1. Installation Guidelines:
    • Install Yokogawa PW481-50 S2 in Yokogawa CENTUM VP/ProSafe-RS racks only; ensure minimum 15cm clearance for ventilation and use forced cooling fans in high-temperature environments.
    • Wire input power with 16AWG or larger cables (for AC input) and comply with local electrical codes for hazardous area wiring (e.g., explosion-proof conduit for Zone 2).
  2. Configuration Notes:
    • Configure redundancy mode via Yokogawa’s Centum VP Engineer Station software to enable automatic switchover and diagnostic signal mapping to the plant’s SCADA system.
    • Set overvoltage/overcurrent thresholds to match connected load requirements (e.g., 26V DC OVP for 24V ProSafe-RS modules).
  3. Troubleshooting:
    • For redundancy alarms: Check standby channel status (LED indicators) and verify input power to both channels; replace the faulty channel if switchover fails.
    • For output ripple issues: Inspect output wiring for loose connections or EMI interference (reposition cables away from VFDs) and verify load compatibility.
    • Hot-swapping: Follow Yokogawa procedures (deactivate the channel via software) to avoid voltage spikes during module replacement.
  4. Maintenance:
    • Perform quarterly checks of input/output terminals for corrosion and torque; clean contacts with approved cleaner if needed.
    • Test redundancy switchover functionality every 6 months using Yokogawa’s diagnostic tools to ensure <3ms transition time.
    • Stock spare Yokogawa PW481-50 S2 modules for critical high-capacity systems to minimize downtime in case of failure.

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