Product Overview

The Yokogawa PW481-50 is a high-reliability power supply module engineered specifically for use within Field Control Units (FCUs), such as the AFV30S and AFV30D models. This module serves as the primary energy source for the controller backplane, providing regulated DC power to critical components including CPU processor modules (CP451, CP461, or CP471) and ESB Bus Coupler modules.

Designed to meet the rigorous demands of continuous process industries, the PW481-50 is frequently deployed in dual-redundant configurations. In this setup, two modules operate in parallel to share the load; should one unit encounter a fault, the surviving module instantaneously assumes the full power load without any interruption to the process logic or field communication. This "no-break" power architecture is essential for preventing unscheduled shutdowns in high-stakes environments like petrochemical refineries and power generation facilities.

Technical Specifications

• Manufacturer: Yokogawa

• Model Number: PW481-50

• Module Type: Power Supply Module

• Input Voltage: 100-120 V AC (Rating) / 85-132 V AC (Permissible)

• Input Frequency: 50/60 Hz ± 3 Hz

• Output Capacity: 5V DC and 24V DC for internal bus and I/O logic

• Maximum Power Consumption: 320 VA

• Redundancy Support: Compatible with duplexed (dual-redundant) configurations

• Heat Dissipation: Approx. 50 W

• Operating Temperature: 0°C to +50°C

• Weight: 2.05 kg

• Dimensions: 37.0 x 30.0 x 10.7 cm

• Origin: Japan

Key Technical Characteristics

• Fault-Tolerant Redundancy: Natively supports high-availability clusters where two modules work in tandem. The integrated load-balancing circuitry ensures smooth power delivery and facilitates millisecond-level failover.

• Hot-Swappable Maintenance: In a redundant system, a faulty PW481-50 can be replaced while the system is live ("hot-swapping"). This allows for hardware repair without disrupting the Field Control Station’s active operation.

• Intelligent Self-Diagnostics: Features internal monitoring for output voltage stability, overcurrent conditions, and thermal limits. Status indicators on the front panel provide immediate visual confirmation of module health.

• High Load Support: Capable of powering a fully populated FCU, including the processor pair and up to six specialized I/O modules, maintaining voltage regulation even under peak load transitions.

• Enhanced Electromagnetic Compatibility: Built to industrial EMC standards to ensure stable performance in the presence of high electrical noise, common in environments with heavy motor loads or high-frequency switching.

• Robust Connection Design: Utilizes high-integrity terminal connections designed to resist loosening caused by industrial vibration, ensuring long-term operational continuity.