YOKOGAWA PW402

Description

Product Description

Product Parameters

• Brand/Model: YOKOGAWA PW402
• Core Power Parameters
  • Input Voltage: 100-240V AC (50/60Hz) or 110-300V DC (dual redundant input per unit)
  • Output Voltage: 24V DC (regulated), ±0.3V accuracy (enhanced precision vs. PW401)
  • Output Current: 20A total (2×10A hot-swappable units with load sharing)
  • Efficiency: ≥92% (at full load), ≥88% at 25% load
  • Ripple & Noise: ≤30mV p-p (24V output, ultra-low for sensitive electronics)
• Protection & Safety Parameters
  • Overvoltage Protection: 27V DC (automatic shutdown with manual reset for critical faults)
  • Overcurrent Protection: 11A per unit (constant current limiting + short-circuit protection)
  • Surge Protection: IEC 61000-4-5 (±4kV surge immunity, double that of PW401)
  • Isolation: Input-output isolation (4kV AC), output-output isolation (1kV AC)
• Environmental & Physical Parameters
  • Operating Temperature: -20°C ~ +70°C (extended range vs. PW401)
  • Storage Temperature: -40°C ~ +85°C
  • Vibration Resistance: 10g (10-2000Hz, IEC 60068-2-6 standard)
  • Power Consumption: ≤3W (no-load per unit)
  • Protection Grade: IP20 (cabinet installation)
  • Installation Method: DIN 35mm rail mounting or Yokogawa standard rack installation
  • Dimensions: 170mm × 120mm × 100mm (2-unit redundant configuration)

Advantages & Features

1. Dual Hot-Swappable Units with Load Sharing: YOKOGAWA PW402 deploys two independent 10A power units that share the system load equally. Either unit can be hot-swapped for maintenance without interrupting power to connected devices, eliminating downtime and enhancing system availability.
2. Enhanced Precision & Low Noise: With ±0.3V output accuracy and ≤30mV p-p ripple/noise, YOKOGAWA PW402 provides ultra-stable power to sensitive DCS/SIS components (e.g., high-precision I/O modules, controllers), ensuring reliable signal processing and measurement accuracy.
3. Advanced Diagnostics & Predictive Maintenance: YOKOGAWA PW402 monitors key parameters (output voltage/current, temperature, fan status) in real time, sending alerts for potential faults (e.g., deteriorating capacitors, fan failure) via the CENTUM VP system. This predictive capability reduces unplanned downtime by up to 50%.
4. Extended Environmental Tolerance: Operating in -20°C to +70°C and withstanding 10g vibration, YOKOGAWA PW402 performs reliably in extreme industrial environments, including cold offshore platforms, hot chemical plant control rooms, and high-vibration pump stations.

Application Fields & Cases

1. LNG Plant SIS Power Supply: A major LNG terminal deployed YOKOGAWA PW402 to power its ProSafe-RS SIS controllers and emergency shutdown modules. The dual hot-swappable units allowed maintenance of one power unit during peak production, while the extended temperature range (-20°C) ensured operation in the terminal’s cold coastal environment.
2. Chemical Plant Continuous Process DCS: A petrochemical plant integrated YOKOGAWA PW402 into its CENTUM VP DCS for a continuous polymerization process. The module’s low ripple/noise stabilized power to high-precision flow meters and pressure transmitters, reducing measurement errors by 30% and improving product consistency.
3. Offshore Oil Platform Control System: An offshore oil platform used YOKOGAWA PW402 to supply power to its DCS and fire/gas detection systems. The 4kV surge protection withstood lightning-induced voltage spikes, while load sharing ensured uninterrupted power during a partial grid failure, preventing a platform-wide shutdown.

Competitor Comparison

Selection Suggestions & Precautions

1. Selection Suggestions: YOKOGAWA PW402 is the top choice for Yokogawa CENTUM VP/ProSafe-RS users requiring 20A redundant power with load sharing, enhanced precision, or operation in extreme environments (e.g., offshore platforms, cold storage facilities). For lower current needs (10A), Yokogawa PW401-10 remains a cost-effective option. Non-Yokogawa system users may opt for Siemens SITOP PSU8600 for broader compatibility.
2. Precautions:
   • Connect each power unit to independent input sources (e.g., main grid + UPS) to maximize redundancy and avoid common-mode failures.
   • Ensure adequate ventilation around the module (minimum 5cm clearance) to maintain performance at high temperatures and prevent overheating.
   • Use only Yokogawa-certified cables and connectors to maintain isolation and surge protection integrity.
   • Regularly review diagnostic data (recommended monthly) to identify early signs of component degradation and schedule proactive maintenance.

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