YOKOGAWA PW482-50 Power Supply Module: Specs, Compatibility & Availability

Technical Dossier

Product Details And Specifications

YOKOGAWA PW482 Series: Comprehensive Module Range and Technical Overview

The YOKOGAWA PW482 series power supply modules are core infrastructure components within the CENTUM CS 3000 and CENTUM VP Distributed Control Systems (DCS) — platforms that hold dominant installed-base positions across global heavy industries including petrochemical complexes, LNG terminals, nuclear power facilities, crude oil refineries, and pulp & paper mills. The PW482-50 specifically provides regulated DC power to field control station (FCS) bus backplanes, ensuring uninterrupted process control under continuous 24/7 industrial operating conditions. These modules are engineered to IEC and JIS industrial standards and are designed for redundant power configurations to eliminate single points of failure in safety-critical environments.

The Evolution of PW482 Architecture

The PW482 power supply lineage traces its origins to the CENTUM CS (Classic Series) platform introduced in the mid-1990s, which established YOKOGAWA's modular DCS backplane architecture. The CS 3000 generation (released circa 1998) standardized the 48V DC bus topology used across field control stations, with the PW482 family serving as the primary AC-to-DC conversion layer. With the transition to CENTUM VP (Versatile Platform, introduced 2008), YOKOGAWA maintained backward hardware compatibility for PW482-series modules, allowing existing CS 3000 installations to migrate to VP software environments without full hardware replacement — a critical design decision that extended the operational lifespan of these modules well into the 2020s.

As CENTUM CS 3000 entered its end-of-active-support phase (YOKOGAWA announced extended lifecycle support through 2029 for select components), the PW482-50 and its variants transitioned from standard catalog items to managed lifecycle parts. Procurement now relies on certified secondary-market suppliers and authorized repair channels. Redundant power supply configurations using dual PW482 modules remain the standard recommendation for any FCS node operating in a safety-instrumented environment.

PW482 Full Catalog & Functionalities (SKU List)

The following SKUs represent the verified PW482 series and associated CENTUM CS 3000 / VP power infrastructure modules. Each entry reflects a distinct hardware variant with specific voltage, wattage, or form-factor differentiation:

PW482-50: 100–240V AC input, 48V DC output power supply module for FCS backplane; standard single-slot form factor.
PW482-51: Redundant-rated variant of PW482-50; supports hot-swap parallel operation for N+1 redundancy configurations.
PW481-10: 24V DC output power supply; used in field terminal bus (FTB) and remote I/O node applications.
PW481-11: Redundant-pair version of PW481-10; dual-module hot-standby for remote I/O power rails.
PW484-10: High-capacity 48V DC supply for expanded FCS nodes with elevated I/O module counts.
PW484-11: Redundant variant of PW484-10; used in large-scale FCS configurations exceeding 32 I/O slots.
PW701-10: 24V DC DIN-rail power supply for CENTUM VP remote I/O panels and marshalling cabinets.
PW701-11: Redundant-rated DIN-rail supply; paired with PW701-10 in critical remote node installations.
PW402-50: Legacy 48V DC supply from CENTUM CS (pre-CS 3000) architecture; functionally equivalent predecessor to PW482-50.
PW402-51: Redundant variant of PW402-50; found in older CS installations still under extended maintenance contracts.
CP345-10: Field Control Station CPU module; primary processor for CENTUM CS 3000 FCS nodes, dependent on PW482 power rail.
CP451-10: CENTUM VP FCS CPU module; compatible with PW482-series power supply infrastructure.
EB401-10: FCS expansion bus coupler; connects additional I/O nest units to the main FCS backplane powered by PW482.
EB501-10: Enhanced bus coupler for CENTUM VP; supports extended I/O nest configurations with PW482-51 redundant power.
NB10D-10: Node bus interface module; bridges FCS backplane to field network segments, powered from PW482 48V rail.
ALR111-S00: Alarm management module for CENTUM VP; installed in FCS nest, draws power from PW482 supply bus.
AAI141-S00: Analog input module (4–20mA, 16-channel); standard I/O module operating on PW482-powered FCS backplane.
ADV151-P00: Digital input module (32-channel, 24V DC); co-resident with PW482 in standard FCS nest configurations.

Sourcing Hard-to-Find & Obsolete PW482 Parts

DriveKNMS maintains a dedicated inventory program for YOKOGAWA CENTUM CS 3000 and CENTUM VP lifecycle components, with particular focus on power supply modules that are no longer available through standard YOKOGAWA distribution channels. The PW482-50 and its redundant variant PW482-51 are among the most frequently requested obsolete parts from refineries and chemical plants operating legacy CS 3000 FCS nodes on extended maintenance contracts.

Our sourcing process for PW482-series modules includes: verification of original YOKOGAWA part numbers against hardware revision markings, cross-referencing with CENTUM CS 3000 system configuration databases, and confirmation of compatibility with the target FCS node's backplane revision. We maintain stock of both new-old-stock (NOS) units and professionally refurbished modules, with full traceability documentation available upon request. Lead times for PW482-50 are typically 3–10 business days depending on current inventory status.

Quality Control for the PW482 Range

Power supply modules in the PW482 series present specific test requirements due to their role as the primary energy source for the FCS backplane bus. DriveKNMS applies the following verification procedures to all PW482-series units prior to shipment:

DC Output Voltage Calibration: Output measured under rated load conditions; tolerance verified to ±1% of nominal 48V DC specification.
Ripple & Noise Analysis: High-frequency ripple measured with oscilloscope; must remain below YOKOGAWA-specified threshold to prevent false triggers on sensitive analog I/O modules.
Inrush Current Test: Cold-start inrush current profiled to confirm compatibility with upstream AC circuit breaker ratings.
Thermal Stress Cycling: Units subjected to accelerated thermal cycling (0°C to 55°C) to identify latent capacitor or MOSFET degradation common in aged power supply modules.
Backplane Bus Load Test: Module tested under simulated FCS backplane load using calibrated resistive load bank equivalent to a fully populated 16-slot I/O nest.
Redundancy Switchover Verification: For PW482-51 units, automatic switchover timing is measured and confirmed within YOKOGAWA-specified parameters (<20ms transfer time).
Visual & PCB Inspection: Full inspection for electrolytic capacitor bulging, PCB trace corrosion, and connector pin integrity — failure modes specific to modules recovered from high-humidity or coastal industrial environments.