Yokogawa PW401‑S4 Power Supply Module – Product Description

Overview

The Yokogawa PW401‑S4 is a compact, rack-mounted power supply module designed for CENTUM VP DCS and ProSafe‑RS SIS systems. It provides stable, regulated DC power to Field Control Stations (FCS), CPUs, and I/O modules. Moreover, its robust design ensures continuous operation in mission-critical industrial environments. Therefore, it is ideal for oil & gas, petrochemical, power generation, and water treatment plants requiring reliable, uninterrupted power.

Technical Specifications

Electrical

• Input Voltage: 100–240 V AC, 50/60 Hz (universal)

• Output Voltage: 5 V DC regulated supply (typical for Yokogawa backplane)

• Output Current Capacity: Up to 20 A continuous

• Output Power: 100 W class

• Ripple & Noise: < 50 mV peak-to-peak

• Efficiency: 85% typical

• Protection Features: Overcurrent, short-circuit, overvoltage

• Redundancy: Supports dual-redundant operation for fault-tolerant systems

Mechanical

• Dimensions (W × H × D): 280 × 100 × 280 mm

• Weight: 3.26 kg

• Mounting: Rack-mounted in FCS or I/O cabinet backplane

• Cooling: Natural convection 

• Protection: IP20

Performance & Diagnostics

• Reliability: Continuous 24/7 operation in harsh industrial environments

• Hot-Swap Capability: Can be replaced without shutting down the system

• Diagnostics: LED indicators for input/output status and fault conditions

Environmental & Compliance

• Operating Temperature: 0 °C to +55 °C

• Storage Temperature: −20 °C to +70 °C

• Relative Humidity: 5–95% non-condensing

• Certifications: CE, UL, CSA (depending on configuration)

• Origin: Manufactured in Japan

FAQ

Q1: What is the input voltage range for PW401‑S4?
It supports a universal AC input voltage of 100–240 V at 50/60 Hz.

Q2: Can this module operate redundantly?
Yes, it supports dual-redundant operation for fault-tolerant systems.

Q3: What protection features does PW401‑S4 include?
It includes overcurrent, short-circuit, and overvoltage protection.

Q4: Is hot-swap replacement possible?
Yes, the module can be replaced without shutting down the system.

Q5: Which systems is PW401‑S4 compatible with?
It integrates seamlessly with Yokogawa CENTUM VP DCS and ProSafe‑RS SIS systems.