Product Overview

The Yokogawa PW481 serves as the high-capacity energy core for CENTUM VP and CS 3000 Distributed Control Systems (DCS). This rack-mountable module converts wide-range AC input into precision-regulated 24V DC power, sustaining system processors, I/O nodes, and communication units. We provide this module as 100% Brand New and Original, ensuring your control infrastructure operates with the stability required for mission-critical automation in the oil, gas, and power sectors.

Technical Specifications

Engineering Advantages

• High-Density 240W Capacity: The PW481 delivers a robust 240W output, providing ample power for fully-loaded DCS racks. This high capacity allows engineers to support extensive I/O module configurations without requiring additional power injection points.

• Elimination of Mechanical Wear: By utilizing a fanless, natural convection cooling design, the PW481 removes the most frequent failure point in industrial power supplies—the cooling fan. This prevents the intake of corrosive dust and significantly increases the module’s Mean Time Between Failures (MTBF).

• Active-Active Redundancy: The module supports dual redundant configurations. If one unit fails, the secondary module instantly assumes the full electrical load. This seamless failover prevents catastrophic system resets and maintains process continuity in 24/7 manufacturing environments.

• Universal Grid Compatibility: The internal circuitry accepts a wide input range of 100–240 V AC. This flexibility allows global standardization, enabling the same PW481 model to function across different regional power grids without the need for external transformers.

• Advanced Fault Isolation: Integrated protection circuits safeguard the sensitive CPU backplane. During an over-voltage or short-circuit event, the module isolates the fault, ensuring that electrical anomalies do not propagate to the system's logic processors or I/O cards.

FAQs

• Can I use the PW481 to replace an older PW401 or PW482?

  The PW481 is specific to the CENTUM VP and CS 3000 rack architecture. While it shares the 24V DC output profile with other models, always verify the backplane connector and rack model compatibility. It is not interchangeable with 24V DC input modules like the PW484.

• Does the PW481 support hot-swapping during a live process?

  Yes, provided you have installed the module in a redundant rack configuration. You can replace a faulty PW481 without powering down the station, significantly reducing Mean Time to Repair (MTTR).

• What mounting precautions should I follow?

  Maintain the specified clearance around the rack to allow natural convection cooling. Ensure the control cabinet provides proper grounding and ventilation to prevent heat build-up, which can degrade the lifespan of the electrolytic capacitors.

• Why is "Brand New" condition critical for power modules?

  Power supplies contain capacitors that age over time. Used or "New Old Stock" units may have dried capacitors that fail under high thermal loads. A 100% Brand New PW481 guarantees a full service life and the peak efficiency required for modern DCS stability.