YOKOGAWA SPW481-53

YOKOGAWA SPW481-53

Product Overview
The Yokogawa SPW481-53 is a power supply module designed for Yokogawa industrial control and safety systems. The SPW481 family serves as a 100-120 V AC input power module, and the -53 suffix indicates a version with G3 conformal coating and an extended temperature range suitable for harsher industrial environments. It is commonly used in ProSafe-RS safety systems and CENTUM series distributed control systems to provide stable internal power to racks, controllers, communication modules and I/O modules.

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Description

YOKOGAWA SPW481-53

Technical Specifications

  • Brand: Yokogawa
  • Model: SPW481-53
  • Product type: AC input power supply module
  • Input voltage: 100-120 V AC
  • Suffix -5: Standard type without explosion-proof protection
  • Suffix -E: Standard type with explosion-proof protection
  • Suffix 3: ISA standard G3 conformal coating and extended temperature range, typically -20 °C to 70 °C
  • Optional /ERFI: Enhanced RFI immunity
  • Application system: ProSafe-RS safety system and CENTUM series control systems
  • Mounting: Rack or backplane-mounted in Yokogawa control stations
  • Certifications: Subject to product revision; commonly compliant with IEC 61508-related safety system requirements when used in ProSafe-RS configurations

Functional Features

  • Provides regulated DC power to control system modules.
  • Accepts 100-120 V AC input for industrial plant power systems.
  • Supports redundant power configurations in safety and DCS racks.
  • Designed for continuous operation in process and safety applications.
  • G3 conformal coating improves resistance to humidity, dust and corrosive atmospheres.
  • Extended temperature rating supports installation in non-air-conditioned industrial cabinets.
  • Compatible with Yokogawa ProSafe-RS and CENTUM system architectures.
  • Supports system diagnostics and status monitoring through the host rack.

Application Scenarios

  • Oil and gas process control systems.
  • Chemical and petrochemical plant safety systems.
  • Power generation control and protection.
  • ProSafe-RS independent safety instrumented systems.
  • CENTUM VP and CENTUM CS 3000 control stations.
  • Pipeline and terminal automation.
  • Water and wastewater treatment control.
  • Retrofit and maintenance of existing Yokogawa installations.

Performance Parameters

  • 100-120 V AC input power conversion.
  • G3 conformal coating for improved environmental protection.
  • Extended temperature operation down to -20 °C and up to 70 °C for the -53 variant.
  • Designed for integration into safety-rated and process control racks.
  • Supports redundant power supply arrangements.
  • Exact output voltage, output current, power rating, efficiency, hold-up time, inrush current, MTBF and detailed environmental limits must be confirmed from the official Yokogawa SPW481/SPW481-53 datasheet and nameplate.

Material Composition

  • Industrial printed circuit board.
  • AC-DC power conversion circuitry.
  • Transformers, capacitors and filtering components.
  • Overvoltage and overcurrent protection circuits.
  • Conformal coating for environmental protection.
  • Metal or reinforced polymer housing.
  • Backplane power connectors.
  • Status LEDs and identification labels.

Structural Features

  • Compact rack-mount module form factor.
  • Front or rear access depending on system configuration.
  • Backplane interface for power distribution to rack modules.
  • Status indicators for power and fault conditions.
  • Clear model and revision identification.
  • Designed for insertion into Yokogawa control station racks.
  • Robust construction for industrial control room and field cabinet use.

Working Principle
The SPW481-53 receives 100-120 V AC power from the plant supply and converts it into regulated DC voltages required by the control system rack. The converted power is distributed through the backplane to processors, communication modules, I/O modules and other installed cards. Internal protection circuits monitor voltage, current and temperature conditions. In redundant configurations, a second power module can share or back up the load so that a single power failure does not interrupt system operation.

Installation Requirements

  • Install only in a compatible Yokogawa control station or rack.
  • Verify that the AC input voltage matches the 100-120 V AC rating.
  • Power down the rack before inserting or removing the module.
  • Ensure proper grounding of the control cabinet and AC supply.
  • Maintain adequate ventilation around the power module.
  • Confirm that the -53 environmental rating matches the installation site.
  • Use approved Yokogawa racks, backplanes and accessories.
  • Follow plant electrical safety procedures during installation.

Precautions for Use

  • Do not exceed the rated input voltage or environmental limits.
  • Do not mix incompatible power module revisions in the same rack.
  • Verify redundancy settings before relying on a single module.
  • Keep the module clean and free from conductive contamination.
  • Replace failed modules with the correct Yokogawa part number.
  • Record serial numbers and configuration data during maintenance.
  • Avoid installation in areas with excessive vibration or moisture beyond the rated range.
  • Refer to the official Yokogawa SPW481 and ProSafe-RS documentation for exact wiring, configuration and troubleshooting procedures.

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