Yokogawa PW401-S2 Power Supply Module

Description

The Yokogawa PW401-S2 is an Input Power Supply Module designed for Yokogawa’s legacy and transition-phase Distributed Control Systems, primarily the CENTUM CS and CENTUM CS 3000 series. It is a 200–240 V AC module utilized to power Remote I/O (RIO) units and local node units. 

Specifications

• Model Number: PW401-S2
• Input Voltage: 200 to 240 V AC nominal.
• Frequency: 50/60 Hz.
• Input Voltage Range: 170 to 264 V AC.
• Compatibility: Used in RIO nodes and cabinet assemblies for AFV and ANB series hardware.
• Mounting: Occupies dedicated power supply slots on the left side of the rack.
• Output Power: Provides regulated DC power to the backplane for CPU and I/O module operation.
• Shipping Weight: Approximately 2.1 kg.

Features

• Redundancy Support: Specifically engineered for high-availability systems. Two PW401-S2 modules can be installed in a single rack to operate in a 1:1 redundant configuration, sharing the load and ensuring zero downtime if one unit fails.
• Galvanic Isolation: Provides a high degree of electrical isolation between the high-voltage plant mains and the low-voltage digital components on the system backplane.
• Status Indicators: Includes clear LED indicators (typically "POWER" and "FAULT") on the front faceplate for rapid visual diagnostics.
• Internal Protection: Equipped with over-current and over-voltage protection circuits to prevent damage to expensive I/O and processor modules during electrical faults.
  
• Heat Dissipation: Designed for natural convection cooling within standard industrial cabinets, maintaining stable output even in high-density rack configurations.