Product Description

The PW481 S2 is a high-reliability AC power conversion module designed for Yokogawa CENTUM VP and CS 3000 control systems. It converts 100–120 V AC mains power into regulated DC power to drive both internal processor logic and external field instrumentation.

As an S2 style revision, the PW481 offers enhanced electrical stability, making it the preferred choice for North American and Japanese industrial grids where 100–120 V AC is standard.

Technical Specifications

• Model / Style: PW481 (PW481 S2)

• Input Voltage Range: 100–120 V AC (±10%)

• Frequency Requirement: 50/60 Hz

• Power Rating: 200–230 VA

• Output Distribution:

  • System Logic Power: 5.1 V DC

  • Transmitter / Transducer Power: 24 V DC

• Redundancy Support: Compatible with dual-redundant power configurations

• Connection Type: M4 screw terminal blocks for secure, high-vibration-resistant wiring

• Environmental Rating: Cabinet-mounted industrial environments

• Cooling: Natural convection airflow

Operational Role and Reliability

• Serves as the critical energy regulator for Field Control Units (FCU)

• Isolates sensitive DCS electronics from raw mains power and filters EMI to protect signal integrity from meters and transducers

• Dual-redundant operation: Two modules share the load; if the primary fails or input is lost, the secondary takes over the full 200 VA load instantly, preventing process interruptions

Technical FAQ

Q: Can the PW481 S2 be replaced while the system is running?
A: Yes. In a redundant setup, the PW481 S2 is hot-swappable, with the redundant module maintaining the system load during replacement.

Q: What is the difference between the PW481 and the PW482?
A: The PW481 is designed for 100–120 V AC systems, while the PW482 is for 220–240 V AC. They are not interchangeable regarding input voltage.