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The PW404 S1 is a plug-in modular power supply unit designed for the CENTUM CS 3000 and CENTUM VP distributed control systems (DCS). It converts standard input power into stable, regulated DC voltages required to safely operate downstream control system modules.
Grid Isolation: Effectively isolates surges, spike voltages, and electromagnetic interference
Seamless Redundancy: Ultra-fast current sharing and power switching ensure zero interruption during single-point failures
Industrial-Grade Components: Built with high-temperature resistant, long-life aluminum electrolytic capacitors
The exterior interface features dedicated status indicator lights that display operational readiness and output conditions, allowing immediate verification of the unit's active state. For configurations requiring continuous operations, the module supports parallel deployment with a secondary unit, allowing the total electrical load to balance across both hardware paths. If one unit is removed or experiences a fault, the connected hardware maintains its electrical supply through the remaining live path without operational drops. Internally, the hardware composition utilizes specialized aluminum electrolytic capacitors that sustain physical and operational integrity over extended service periods in standard control room environments.
Additionally, the electrical assembly features built-in protection pathways that automatically clamp excess voltage and restrict current flow when downstream loads experience short circuits. The rear connector pins establish direct ground paths upon insertion into the rack, mitigating static accumulation and maintaining voltage reference baselines across the entire chassis. This grounding configuration, combined with thick internal trace paths, manages thermal dispersion through natural convection without the use of mechanical cooling fans.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Yokogawa PW404 S1 Power Supply Module Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in t330101-00-16-10-01-05n.
Oil & Gas Extraction
Provides power to sensors and Remote Terminal Units (RTUs) in Wellhead Control Panels (WHCP) and Emergency Shutdown (ESD) valves on offshore drilling platforms to ensure safety monitoring at extraction sites.
Petrochemical & Refining
Supplies power to DCS I/O modules and field temperature/pressure transmitters in hydrocracking and crude distillation units to achieve precise control over high-risk chemical processes.
Thermal & Nuclear Power Generation
Acts as the input power source for DCS cabinets in boiler control systems, turbine control systems (DEH), and data acquisition systems to ensure continuous power output.
Iron, Steel & Metallurgy Industry
Provides stable 24V DC power to automation control cabinets, displacement sensors, and solenoid valve driver boards in blast furnace ironmaking, converter steelmaking, and hot rolling lines.
Hydropower & Dam Monitoring
Supplies power to the governor and excitation systems of hydro-generator units, as well as data acquisition modules for dam structural safety monitoring (such as displacement and leakage sensors).
Pulp & Paper Industry
Provides redundant power to field control stations and I/O modules in continuous paper-making, bleaching, and paper thickness/moisture control (QCS) on large paper machine lines.
Ensure the input voltage remains within the specified range and maintain strict grounding to prevent electromagnetic interference. Never overload the module, and regularly inspect output voltage stability and cooling fan status to prevent overheating and degradation. During redundant hot-swapping, ensure the locking mechanism is securely engaged to avoid system power failure or arcing damage caused by poor contact.
Alternative Names
Alternative Names
PW404 S1PW4O4 S1PW404 SIPW4O4 SI
Technical notes
Technical notes
The Yokogawa PW404 S1 is a rack-mounted power supply module for CENTUM DCS systems, converting external inputs into regulated DC power. This Style 1 module incorporates complete electrical protection, supports online hot-swapping in dual-redundant configurations, and ensures uninterrupted system power for continuous industries like petrochemicals and power generation.
The PW404 S1 is a standard system power supply module (Style 1 hardware revision) developed by Yokogawa for its CENTUM CS 3000 and CENTUM VP Distributed Control Systems (DCS).
What is the core function of the PW404 S1 module in a system?
It is responsible for conditioning and converting the externally supplied main AC or DC input power into stable, regulated low-voltage DC power to directly energize the racked CPU modules, control units, and internal system backplanes.
How do technicians properly install the PW404 S1 within a control enclosure?
The module features a slide-in physical structure. Align it with the designated power supply slot on the baseplate, push it firmly backward into position, and secure the top and bottom mounting screws.
What input voltage configurations does the PW404 S1 support?
This depends on the specific suffix codes. The series typically supports standard 100-120 Vac or 220-240 Vac AC inputs, or 24 Vdc DC inputs for specific variants.
How do we configure the PW404 S1 for a redundant power supply setup?
Insert two PW404 S1 modules of identical specifications into the two adjacent power slots on the same baseplate. The backplane's built-in diode-oring circuit automatically enables power paralleling and load balancing.
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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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