Product Overview

The Yokogawa PW301 S4 is a high-reliability power supply module specifically engineered for the CENTUM series Distributed Control Systems (DCS). This module functions as a primary power source for system racks, converting standard AC input into stabilized DC voltage required for the operation of CPU modules, I/O units, and backplane communication.

Designed for mission-critical industrial environments, the PW301 S4 ensures high availability through a robust electrical architecture. It is built to maintain steady output even under fluctuating input conditions, providing the necessary isolation and surge protection to safeguard sensitive logic circuitry. The S4 designation indicates a specific revision level tailored for enhanced durability and long-term service life in process control applications.

Technical Performance Characteristics

• Input Voltage Range: 100 to 120 V AC (Frequency: 50/60 Hz)

• Output Voltage: 5.1 V DC (Logic Power) and 24 V DC (Field/Device Power)

• Current Rating: Supports up to 15 A on the 5.1 V logic circuit

• Total Power Capacity: Approximately 142 W (Configuration dependent)

• Holdup Time: 20 ms (Maintains output stability during momentary voltage drops)

• Protection Circuitry: Built-in overcurrent and overvoltage safeguards

• Cooling: Natural convection or fan-assisted depending on chassis installation

Physical and Environmental Specifications

• Module Weight: 2.05 kg (Net weight)

• Shipping Dimensions: 37 x 30 x 10.7 cm

• Operating Temperature: 0 to 60 °C (32 to 140 °F)

• Storage Temperature: -40 to 85 °C

• Relative Humidity: 5% to 95% (non-condensing)

• Manufacturing Origin: Japan

• Mounting Compatibility: Standard Yokogawa DCS Power Supply Slot

Operational Reliability and Maintenance

As a core component of the power distribution layer, the PW301 S4 is optimized for continuous 24/7 operation. Its high-efficiency design minimizes heat dissipation, which extends the lifespan of adjacent modules within the I/O rack. The module is intended for use as both a primary unit in new installations and a high-performance replacement for aging PW301 series units.

The integrated monitoring capabilities allow the system to detect power health status, ensuring that any deviations in voltage are reported to the control system for proactive maintenance. Its rugged construction is resistant to the vibrations and thermal stresses commonly found in energy management and heavy process manufacturing facilities.