SPW482 Yokogawa

SPW482 Yokogawa Power Board

Product  Description：

Yokogawa Power Boards are high-reliability power supply and distribution units engineered for mission-critical process automation systems, such as the CENTUM Distributed Control System (DCS) and ProSafe-RS Safety Instrumented Systems. These boards are responsible for converting incoming utility power into stable, filtered, and regulated DC voltages required by central processing units, I/O modules, and field sensors. Built to conform to rigorous industrial safety standards, they play a vital role in preventing system downtime in continuous process industries.

Product Parameters

The technical architecture of a Yokogawa Power Board is defined by its strict voltage regulation, isolation capabilities, and power density:

• Input Voltage Compatibility: Supports wide-range inputs including universal AC voltages from 100V to 240V AC at 50 or 60Hz, as well as industrial 24V DC or 110V DC sources.

• Output Voltage Precision: Delivers highly stable DC rails, typically 5V DC for internal logic circuits and 24V DC for external field device signaling, with line regulation maintained within a fraction of a percent.

• Holdup Time: Features advanced energy storage capability, providing a holdup time of 20 milliseconds or more during temporary AC power dips to prevent CPU resets.

• Isolation Resistance: Minimum of 100 Megohms at 500V DC between the primary power input, secondary outputs, and the chassis ground terminal.

• Dielectric Strength: Built to withstand transient surges, with a rated dielectric isolation voltage typically reaching 2kV AC or higher for one minute.

• Efficiency Rating: Utilizes high-efficiency switching topologies that achieve up to 88 percent efficiency, minimizing heat dissipation inside enclosed control cabinets.

Product Advantages

Yokogawa Power Boards are distinguished by their exceptional reliability and integration within safety-instrumented environments:

• True Redundant Operation: Supports parallel, diode-isolated redundancy configurations allowing two power boards to share the system load, ensuring that if one unit fails, the other assumes full load instantaneously without any voltage drop.

• Comprehensive Diagnostics: Equipped with hardware-level monitoring circuits that feed status data directly to the DCS system, allowing operators to monitor power health, output voltage levels, and fan status from the central control room.

• Advanced Fault Isolation: Features integrated overvoltage, overcurrent, and short-circuit protection with automatic recovery, ensuring that a fault on a single I/O module does not compromise the main backplane power.

• Extended Component Lifespan: Designed exclusively with industrial-grade, high-temperature electrolytic capacitors and heavy copper layers to achieve an operational lifecycle that aligns with the decade-long demands of heavy processing plants.

• Low Electromagnetic Emission: Incorporates robust onboard electromagnetic interference filters, ensuring compliance with strict global EMC standards and protecting sensitive analog measurement signals from high-frequency noise.

Product Applications

These power boards provide the essential energy foundation for large-scale automation architectures worldwide:

• Oil and Gas Refineries: Supplying uninterrupted power to the controllers regulating high-pressure distillation columns, custody transfer systems, and catalytic crackers.

• Chemical and Petrochemical Plants: Powering the safety systems and critical logic loops that manage hazardous exothermic reactions and emergency shutdown valves.

• Offshore Production Platforms: Operating reliably in harsh maritime environments to power subsea control systems and production manifolds.

• Thermal and Nuclear Power Generation: Driving the control racks responsible for boiler feed water regulation, turbine speed control, and reactor monitoring logic.

• Large-Scale Pharmaceutical Facilities: Ensuring clean, glitch-free power for automated batch processing systems where even a millisecond power loss could spoil an entire production run.

Important Precautions

To preserve the safety and longevity of the power board hardware, strict compliance with the following operational rules is required:

• Live Component Hazard: Even after the main power supply is disconnected, internal high-voltage capacitors can hold dangerous electrical charges. Always wait at least five minutes for the circuits to fully discharge before extracting or servicing the board.

• Grounding Connection: The board must be mounted on a properly grounded base unit chassis. Ensure that the protective earth wiring uses the correct gauge and maintains a low-impedance path to prevent noise accumulation.

• Airflow and Derating: Do not obstruct the ventilation paths around the power unit rack. When operating the board in ambient temperatures near its maximum rating, apply the appropriate load derating curves specified in the technical manual to prevent thermal shutdown.

• Balancing Redundant Loads: When installing redundant power boards, verify that the input line voltage and wire lengths are balanced so that the units share the operational load evenly, preventing premature aging of a single module.

• Clean Environment Maintenance: Conductive dust, chemical fumes, and moisture can cause tracking faults and electrical arcing across the high-voltage sections of the board. Ensure the control cabinet maintains its IP rating and environmental seals.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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JUSTWELL PTE. LTD

Our main products include DCS control system spare parts, PLC system spare parts, and robot system spare parts. Our advantageous brands include Allen Bradley, Bently Nevada, ABB, HIMA, Reliance, Bender, National Instruments, Emerson Ovation, Honeywell, Siemens, Allen Bradley, ICS Triplex, FOXBORO, Schneider, GE Fanuc, Motorola, HIMA, Prosoft, and other imported industrial components. Our main products serve a wide range of electronic, metallurgical, chemical, and power plants Industries such as steel mills, rubber, cement, machinery and equipment, and construction.