Product Core Brief

• Model: PW482-50
• Brand: YOKOGAWA
• Series: CENTUM CS3000 / ProSafe-RS
• Core Function: Converts high-voltage AC input into stable DC power for DCS and SIS system components.
• Product Type: AC/DC Power Supply Module
• Key Specs: 220-240 VAC Input | -20°C to 70°C | Standard Type
• Condition: New Surplus / Original

Product Introduction

YOKOGAWA PW482-50 is a high-reliability AC input power supply module for industrial automation systems. This YWA unit provides clean, regulated DC power to field control stations, I/O modules, and safety instrumented systems.

Engineered for extreme environments, the YWA operates reliably from -20°C up to 70°C. It features strong anti-interference capabilities and supports redundant configurations to guarantee continuous power delivery in critical process applications.

Key Technical Specifications

Quality Control Process

Power supplies are the foundation of any DCS, so we test them aggressively. Every YWA goes through a full load-bank test to verify it can sustain maximum output current without voltage droop. We measure output ripple voltage with an oscilloscope to ensure it stays within tight tolerances—excessive ripple kills downstream logic cards. Input voltage is swept across the full 220-240VAC range to confirm stable regulation at line extremes. Thermal performance is validated during a 4-hour burn-in at elevated ambient temperature. Units failing any parameter are scrapped immediately.

Replacement Pitfall Guide

❗ Verify Input Voltage: The PW482-50 is a 220-240VAC module. Do not confuse it with the PW481 series (100-120VAC). Applying 240VAC to a PW481-rated card will destroy it instantly. Always check the front-panel label and the system power distribution diagram.

❗ Redundant Pair Matching: When replacing one module in a redundant pair, the new YWA must match the existing unit’s hardware revision and suffix codes. Mismatched power supplies can cause current sharing imbalances and premature failure of both units.

❗ Temperature Derating: This module is rated to 70°C, but output capacity derates at high temperatures. Verify your cabinet cooling maintains ambient below 50°C for full-load operation. Overheating is the number one cause of premature power supply failure in the field.

❗ Grounding and Bonding: High anti-interference performance depends on proper chassis grounding. Verify the module is securely seated in the rack and that the rack ground strap is intact. Floating grounds invite EMI that causes random I/O faults and communication errors.

Keep these in mind and you’ll cut 90% of rework time.

Compatibility Matrix & Benchmarks

• Output Ripple: < 50mV p-p (full load)
• Redundancy Switchover: < 1ms (bumpless, no process disruption)

Need help verifying your redundant power configuration or checking the cabinet cooling requirements for this module? I can walk you through the pre-installation checklist.