YOKOGAWA PW481-50
YOKOGAWA PW481-50
YOKOGAWA PW481-50
YOKOGAWA PW481-50
YOKOGAWA PW481-50

Yokogawa PW481-50 Power Supply Module for CENTUM VP & ProSafe-RS – Technical Specifications

  • Model: PW481-50
  • Alt. P/N: PW481-50 S2 (style variant)
  • Product Series: CENTUM VP / ProSafe-RS Safety Control Station (SCS)
  • Hardware Type: AC Input Power Supply Module
  • Key Feature: 100-120 VAC input with internal DC conversion, supports dual-redundant configuration, temperature option (-20°C to +70°C)
  • Primary Field Use: Provides stable DC power to Yokogawa CENTUM VP Node Units, FCUs (Field Control Units), FIO Node Units, and Optical ESB Bus Repeater Units
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Description

Hard-Numbers: Technical Specifications

  • Input Voltage Range: 100-120 VAC ±10%, 50/60 Hz ±3 Hz
  • Output Voltages: Not specified as generic PSU (provides DC rails internally to host unit via backplane)
  • Power Consumption: 200 VA maximum
  • Operating Temperature Range: -20°C to +60°C (standard), up to +70°C (suffix -50 option)
  • Storage Temperature Range: -40°C to +85°C
  • Weight: Approximately 1.0 kg
  • Dimensions: Compact module footprint (approx. 35mm x 125mm x 85mm)
  • Protection Class: IP20 (for control cabinet installation)
  • Mounting Type: Rack mount in dedicated slots (P1-P2) of FCU, FIO Node Unit, or Optical ESB Bus Repeater Unit
  • Redundancy Support: Dual-redundant configuration (2 identical PW481-50 modules required)
  • Explosion Protection Options: Standard type (-5 no explosion protection), Explosion-proof type (-E available)
    YOKOGAWA PW481-50

    YOKOGAWA PW481-50

The Real-World Problem It Solves

Your CENTUM VP Node Unit experiences random reboots during high EMI events because the power module lacks input filtering, or the entire node goes offline when a single supply module fails and you lack redundant backup. The PW481-50 eliminates these issues by providing a dedicated, filtered AC-to-DC conversion stage with built-in protection, and when configured in dual-redundant mode, automatic failover ensures continuous node operation without process interruption.
Where you’ll typically find it:
  • CENTUM VP Field Control Units (FCU) requiring 100-120 VAC mains
  • FIO Node Units (ANB10D/S, ANB11D/S series)
  • Optical ESB Bus Repeater Units (ANT10U)
  • ProSafe-RS Safety Control Stations (SCS) with 100-120 VAC input configuration
You get a compact, hot-swappable module designed exclusively for Yokogawa DCS cabinets—providing stable power distribution to all cards within the unit while supporting full redundancy for zero-downtime maintenance.

Hardware Architecture & Under-the-Hood Logic

The PW481-50 is not a generic 24V power supply—it is a dedicated AC input power module designed to mount in specific Yokogawa DCS units. It converts 100-120 VAC mains to regulated DC rails (typically 5V for logic and 24V for I/O) that are distributed internally via the unit backplane. The module includes EMI filtering, surge protection, and overcurrent/overvoltage protection circuits. It communicates fault status to the host processor via the backplane.
  1. AC input (100-120VAC) passes through EMI filtering and input fuse protection
  2. Switching converter generates multiple regulated DC rails (typically 5V and 24V) for internal distribution
  3. Output stages provide power to all modules in the host unit via backplane
  4. Protection circuits monitor input voltage, output current, and temperature
  5. Fault detection circuitry reports status to host processor for alarms and redundancy switchover

Field Service Pitfalls: What Rookies Get Wrong

Mixing Suffix Codes in Redundant PairsInstalling one PW481-50 (100-120V) alongside a PW482-50 (220-240V) in a dual-redundant configuration creates a dangerous mismatch—one module will see overvoltage and fail immediately. Redundant modules must have identical model codes.
  • Field Rule: Verify both modules have the same model code (PW481-50) before installing redundant pairs—mixing input voltage ranges destroys hardware.
Improper Slot InstallationThe PW481-50 must be installed in slots P1-P2 of the host unit. Installing it in I/O slots or attempting to use it as a generic power supply will not work—the connector is exclusive to power slots.
  • Quick Fix: Refer to the unit installation guide—power modules only install in designated P1/P2 slots.
Ignoring G3 Corrosion EnvironmentsIn harsh G3 environments (ANSI/ISA S71.04), the internal electrolytic capacitors and connectors degrade faster than in standard environments. Continuing to operate beyond 8-year replacement cycles increases failure risk.
  • Field Rule: In G3 environments, adhere to the 8-year recommended replacement cycle for PW481 modules—check the installation limitations table in the manual for your specific environment class.
    YOKOGAWA PW481-50

    YOKOGAWA PW481-50

Commercial Availability & Pricing Note

Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.

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