Product Overview

The PW402 is a high-reliability power supply module designed for Yokogawa CENTUM Field Control Stations (FCS). It converts AC mains power into regulated DC voltages required by the internal bus and I/O modules. Available in multiple configurations, including the PW402-S2 variant, this module is engineered for heavy-duty industrial operation.

With high-current output, precise regulation, and robust electrical protection, the PW402 ensures continuous and stable operation even during significant electrical transients, making it a critical component for large-scale process automation.

Technical Specifications

Application & Integration

• Redundant Power Nests: Two modules can operate in parallel; if one fails, the second maintains continuous power

• System Protection: Integrated over-current and over-voltage protection safeguards CPUs and I/O modules

• Field Excitation: Provides 24 V DC loop power for 4–20 mA transmitters and actuators

• Industrial Integration: Compatible with CENTUM CS 3000 and older CENTUM VP architectures

FAQ

What is the difference between PW402 and PW402-S2?
The standard PW402 is a multi-voltage high-capacity module (+12V / +24V), whereas the PW402-S2 is optimized for 24 V DC applications with updated internal circuitry (Style S2) for improved efficiency and reduced heat generation.

Does this module require a cooling fan?
Yes. The PW402’s high power density and continuous-duty design require built-in forced-air cooling to maintain safe operating temperatures.