PW481-50 | Yokogawa CENTUM DCS | AC Power Supply Module

Product Description

The PW481-50 (PW481-50) is a high-performance AC power supply unit engineered for Yokogawa’s Distributed Control Systems (DCS). This module serves as a direct, upgraded replacement for the legacy PW481-10, offering enhanced electrical stability and improved thermal efficiency for Field Control Units (FCU). It is designed to convert wide-range AC utility power into the stabilized DC voltages necessary to drive the system backplane, processor cards, and I/O interface modules.

Designed for high-availability industrial environments, the PW481-50 (PW481-50) features a robust internal filtration system that shields sensitive control logic from line noise and voltage transients. Its heavy-duty chassis is optimized for the physical rigors of control cabinet mounting, ensuring consistent power delivery in 24/7 process industries such as petrochemical refining and power generation.

Technical Specifications

• Brand: Yokogawa Electric Corporation

• Model Designation: PW481-50

• Legacy Compatibility: Direct replacement for PW481-10

• Input Voltage: Auto-ranging 100-120 VAC / 220-240 VAC

• Frequency Range: 50/60 Hz

• Output Voltage Rails: Regulated +12 VDC and +24 VDC (System dependent)

• Physical Footprint: 11 cm (W) x 28 cm (D) x 26 cm (H)

• Net Weight: 3.6 kg

• Cooling Method: Natural convection / Internal heat dissipation design

• Mounting: Dedicated PSU slot within Yokogawa Field Control Units

System Integration & Upgrade Path

The PW481-50 (PW481-50) is the preferred choice for facilities undergoing system lifecycle management. By replacing aging PW481-10 units with the PW481-50 (PW481-50), engineers can improve the overall MTBF (Mean Time Between Failures) of their control racks. The module is fully compatible with existing rack backplanes, requiring no additional wiring modifications for most standard CENTUM configurations.

FAQ

Can the PW481-50 be used in a redundant power configuration?

Yes, the PW481-50 (PW481-50) is designed for use in dual-redundant setups. In a standard Yokogawa FCU, two modules work in parallel to share the load; if one fails, the remaining unit immediately assumes the full load without interrupting the process control intelligence.

What are the primary differences between the PW481-50 and the older PW481-10?

While the form factor remains identical for compatibility, the PW481-50 (PW481-50) utilizes modernized internal components that offer better resistance to heat and improved power factor correction, making it a more reliable and energy-efficient solution for modern DCS cabinets.