SKU: PW301 S4

Yokogawa PW301 S4 Power Supply Module

The Yokogawa PW301-S4 is a high-capacity 100-120V AC power supply module designed for CENTUM series DCS. It delivers stable 24V DC and 5.1V DC logic power with a 20ms holdup time and supports 1:1 redundancy for mission-critical industrial process control.

Operational Overview and Power Integrity

The Yokogawa PW301-S4 functions as the primary energy backbone for CENTUM CS 3000 and CENTUM VP Field Control Stations (FCS). This high-capacity module actively regulates incoming 100–120 V AC line voltage, transforming it into the stabilized 5.1 V DC and 24 V DC outputs required for logic processing and field signaling. Because industrial power grids often experience fluctuations, the unit incorporates a 20 ms holdup capability. This critical delay ensures that the system maintains continuous operation during transient voltage dips, thereby preventing costly process interruptions and data loss.

Built-in Protection and Environmental Durability

Yokogawa engineers the PW301-S4 to withstand the rigorous conditions of heavy industrial processing. The module utilizes an advanced fanless heat dissipation design, which effectively eliminates the mechanical vulnerabilities associated with cooling fans. To protect sensitive downstream CPUs and I/O cards, the unit features integrated overvoltage and overcurrent protection circuits. Furthermore, the “S4” style code signifies a revision optimized for enhanced component longevity, allowing the module to perform reliably in ambient temperatures reaching 60°C within high-density control cabinets.

Redundancy and Maintenance Features

To maximize plant uptime, the PW301-S4 supports a 1:1 dual-redundant configuration within the power supply nest. In this setup, two modules actively balance the load during normal operation; however, if one unit encounters a fault, the secondary module immediately assumes the full power load without any disturbance to the control logic. Technicians benefit from front-access status LEDs that provide instantaneous diagnostics of the “Power OK” condition. Additionally, the module’s design facilitates hot-swapping, which allows maintenance personnel to replace a faulty unit while the process remains live.