Yokogawa PW484-50 S1 is a rack-mounted DC input power supply module designed for Yokogawa CENTUM VP DCS control system. It belongs to the PW484 series power unit, accepting external 24 VDC input and converting to multiple regulated internal bus voltages to power Field Control Units (FCU), FIO node units and ESB optical repeater units.This model is widely adopted in projects equipped with DC UPS or battery power distribution. It supports single or dual redundant power configuration to improve system continuous operation reliability, serving as core power infrastructure for petrochemical, power, oil & gas and other continuous process industries.
Yokogawa PW484-50 S1 is a 24 VDC input rack power supply module for CENTUM VP DCS. It supplies stable multi-channel DC power to FCU controllers and FIO node units via backplane bus.
The module supports single or dual redundant configuration, equipped with complete protection circuits and front diagnostic LED indicators. It is the preferred power unit for control rooms with DC UPS power distribution. Widely used in chemical, power and oil & gas factories for DCS rack maintenance and equipment retrofit.
Full part number verification is required before ordering; AC input PW481/PW482 cannot substitute PW484 series. Complete power-on test and redundant switching verification after replacement.
Core Hardware & Functional Characteristics
- Full part number: PW484-50 S1
- Input specification: 24 V DC (±10%), maximum input current 5.5 A, rated power 120 W
- Suffix explanation:
- PW484 = 24 VDC input power supply series
- -50 = standard basic type, non-explosion-proof version
- S1 = style code S1 hardware revision
- Output: Multi-channel stabilized DC power supplied via rack backplane
- Supports dual redundant hot backup installation; two identical modules can be configured to avoid single point power failure
- Front panel LED indicators: Power OK, Fault, Alarm for fast on-site diagnosis
- Built-in overvoltage, overcurrent, short-circuit protection to protect downstream controllers and I/O modules
- Standard plug-in rack structure, compatible with AFV30D, A2FV70D FCU, ANB10D/ANB11D FIO node baseplates
- Conformal coated PCB optional; industrial switching power design with high efficiency and low heat generation
- Recommended service life: 8 years under normal ambient temperature
- CE certified, meets industrial EMC requirements for control room environments
- Operating temperature: 0 ℃ ~ +50 ℃ (standard version)
Typical Application Scenarios
PW484-50 S1 is used for power supply of Yokogawa CENTUM VP DCS racks:
- Refinery, petrochemical plant process control stations
- Thermal power plant auxiliary control and boiler DCS systems
- Oil & gas production plant, offshore platform control systems
- Water treatment, pulp & paper continuous production automation
- System expansion and spare replacement for existing CENTUM VP FCU / FIO racks
- Sites adopting 24VDC UPS centralized power supply scheme
Sourcing & Commissioning Guidelines
- Confirm full part number PW484-50 S1 before purchase. Do not mix up with PW481(100-120VAC), PW482(220-240VAC) and PW484-51(G3 wide temperature variant). Different models cannot be interchanged.
- Use ESD anti-static measures when handling the module to prevent circuit damage.
- For redundant configuration, install two same-version power modules to ensure automatic switching function.
- Check input 24 VDC voltage range and wiring polarity before power-on.
- After installation, verify power LED status; simulate power failure to test redundant switchover performance.
- Schedule periodic inspection and capacitor replacement in accordance with 8-year service life recommendation.
Common Field Faults
- Power module fault alarm: aging internal electrolytic capacitor, input voltage out of tolerance
- Intermittent rack restart: loose backplane contact or unstable 24VDC input
- No output after power on: internal fuse blown caused by backplane short circuit
- Overheating alarm: cabinet ventilation insufficient or long-term overload operation
- Redundant switchover failure: inconsistent hardware revision of two power modules
Product: Yokogawa PW484-50 S1 Power Supply Module
- Rack plug-in power supply for Yokogawa CENTUM VP distributed control system
- Model: PW484-50 S1, 24 VDC input (±10%), rated power 120 W
- Provides regulated internal bus power for FCU controllers and FIO node racks
- Supports single or dual redundant power architecture to enhance system availability
- Built-in overvoltage, overcurrent and short-circuit protection functions
- Front LED indicators for power status and hardware fault diagnosis
- Compatible with AFV30D, A2FV70D, ANB10D, ANB11D baseplates
- Recommended service life: 8 years under normal operating conditions
- Widely deployed in petrochemical, power, oil & gas and water treatment automation
- Used for new DCS rack construction and legacy CENTUM VP maintenance spare replacement
- Strict full part number matching required; AC input PW481/PW482 are non-interchangeable
- Input voltage check and redundant switchover test essential after installation
