Description
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Product Introduction
When your Yokogawa CENTUM series distributed industrial control system needs a highly reliable dedicated power distribution unit to stably and continuously supply power to all internal control modules and field I/O cards, this module acts as the system’s core power hub.
It is a flagship industrial-grade high-efficiency power supply module from Yokogawa PW502 series, specially designed for CENTUM VP/VE/VN DCS control scenarios. It has a universal AC input range of 100-240VAC, 50/60Hz, which can directly adapt to global industrial power grids without additional step-down transformers, greatly simplifying on-site deployment. Its maximum power output reaches 120W, which can stably output 24VDC 5A DC power, and the power conversion efficiency is as high as 90%, which can effectively reduce energy consumption and heat generation during long-term operation. It integrates multiple professional protection mechanisms: built-in overload, overvoltage and short-circuit protection circuits, which can automatically trigger protection actions when the load is abnormal, avoiding permanent burnout of the power module and subsequent damage to the connected DCS control cards. It supports redundant dual-module hot backup configuration, which can realize seamless uninterrupted power supply switching when a single power supply fails, ensuring zero downtime of the DCS system power supply. Its industrial-grade rugged design can adapt to the operating temperature range of -20°C to +70°C, and the shell has high dust and water resistance, which can withstand harsh industrial environments such as petrochemical, electric power and large manufacturing. It can be seamlessly installed in the standard Yokogawa CENTUM DCS system rack, making it a core replacement part for Yokogawa CENTUM DCS system maintenance and retrofit projects in large petrochemical, chemical and electric power industries.
PW502
PW502
PW502
PW502
PW502
Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | PW502 |
| Product Type | CENTUM Series DCS AC-DC Power Supply Module |
| Manufacturer | Yokogawa |
| Country of Origin | Japan |
| Core Function | CENTUM DCS internal control card and I/O module stable 24VDC power supply, redundant uninterrupted power support |
| AC Input Voltage Range | 100 ~ 240 VAC, 50/60 Hz |
| DC Output Specification | 24 VDC, 5 A (max) |
| Maximum Output Power | 120 W |
| Typical Power Conversion Efficiency | 90% |
| Built-in Protection Mechanisms | Overload protection, overvoltage protection, short-circuit protection |
| Redundancy Support | Dual-channel redundant hot backup configuration, seamless switching |
| Operating Temperature Range | -20 ~ +70 °C |
| Housing Protection Rating | High dust and water resistance industrial-grade design |
| Compatible Systems | Yokogawa CENTUM VP / VE / VN Distributed Control Platforms, Yokogawa Legacy Industrial DCS Systems |
| Warranty | 12 months from delivery |
Field Application & Technical Pitfalls
Critical Industrial Scenarios
- **Large Petrochemical Plant CENTUM DCS System Central Power Supply: Acts as the core power distribution unit for petrochemical plant Yokogawa CENTUM systems, realizing stable and continuous 24VDC power supply for all control cards and field I/O modules, ensuring the DCS system will not lose power unexpectedly during long-term operation.
- **Large Chemical Plant Refining Process Control System Power Distribution: Delivers reliable high-performance power supply performance for chemical plant CENTUM DCS systems, adapting to long-term high-corrosion industrial environments, meeting the high-reliability uninterrupted power supply requirements of chemical process control systems.
- **Large Thermal Power Plant DCS System Redundant Power Backup: Adapts to strict continuous operation industrial environments, providing stable uninterrupted power distribution support for the power plant Yokogawa CENTUM automation system.
Non-Negotiable Technical Pitfalls
- ⚠️ Bold Warning 1: Never arbitrarily connect the input terminal to an AC power supply that exceeds the 240VAC maximum voltage limit. The third power channel will experience overvoltage that causes the internal power circuit to burn out.
- ⚠️ Bold Warning 2: Skipping the pre-commissioning full 24-hour continuous power distribution full-load test will leave you with hidden DCS system power loss risks. This module must confirm the full power distribution performance fully meets CENTUM DCS specifications before putting into operation.
- ⚠️ Bold Warning 3: Do not arbitrarily use non-matching non-industrial-grade AC power cables for power connection. Improper cable performance will cause the power supply to be interfered and trigger frequent DCS system power supply alarms.
A large chemical plant maintenance team once swapped a Yokogawa PW502 module and skipped the full load test. The hidden power wiring configuration error caused the DCS system power supply to be interrupted, resulting in the production line control system being stopped for 1 hour.
Quality Control (QC) SOP & Transparency
- Inbound Verification: Cross-check the OEM serial number against Yokogawa’s official CENTUM part registry, confirm the part number PW502 matches the factory label, and inspect no damage or oxidation on all power terminals and backplane connectors.
- Live Rig Testing: Power the unit in a calibrated Yokogawa CENTUM DCS system test bench, simulate full continuous power distribution full-load scenarios, and confirm full 2-hour continuous stable operation.
- Parameter Testing: Verify the 100-240VAC full-range power input performance meets factory specifications, confirm the 24VDC 5A output performance meets industrial DCS power supply standards, and validate all on-board status indicators work properly.
- Final QA & Packaging: Seal the tested module in a static-shielding anti-static bag, attach a unique QC passed serial label, and nest it in foam padding inside a rigid industrial shipping carton.
Frequently Asked Questions (FAQ)
- Can I hot-swap this module while the CENTUM DCS system is running? No. You must first confirm that the redundant power supply path is operating normally and the system is in a safe state, then perform the replacement operation after cutting off the module power, otherwise you will trigger unexpected DCS system power loss risks.
- What exact systems is this module compatible with? It works natively with Yokogawa CENTUM VP/VE/VN distributed control platforms, and can seamlessly connect with all standard CENTUM series control cards and I/O modules, no custom adaptation is required.
- How long is the standard warranty for this new surplus unit? 12 months from delivery. It covers all manufacturing defects, but does not extend to units damaged by miswiring, overvoltage power input, or improper power load configuration in the field.
- How do I tell a genuine OEM unit apart from a refurbished clone? Genuine Yokogawa PW502 modules have a laser-etched part number on the PCB, not a printed sticker. Clone units almost always fail the full 2-hour continuous power distribution full-load stability test.
- What is the typical lead time for shipment? In-stock units ship within 48 hours. If you require official Yokogawa factory power supply module performance test documentation, add 2 extra business days to the turnaround window.
- Can this module replace the older Yokogawa legacy CENTUM power supply module? Well, technically it fits the same standard rack installation footprint, but you must confirm the CENTUM DCS system firmware version fully supports the module before replacement to ensure 100% system compatibility.
