Description
1. Unboxing & Physical Snapshot
- Model & Brand: Yokogawa Electric Corporation, PS-502-01 (Power Supply Module)
- Physical Dimensions: Approximately 15.0 cm x 12.0 cm x 10.0 cm
- Estimated Shipping Weight: 0.9 kg (Boxed with custom high-density foam inserts; Net module weight: 0.7 kg)
- What’s in the Box: Yokogawa power conversion module, heavy-duty plug-in terminal blocks, front-panel status LED indicators, and factory inspection certificate (rack mounting chassis sold separately).
2. Product Introduction
Process control loops require dependable power distribution architectures to ensure uninterrupted plant operation across severe industrial environments. The PS-502-01 module installs directly into dedicated Yokogawa control nests, functioning as a primary power conversion node that steps down and stabilizes field inputs into clean operational voltages.
Unstable bus power frequently introduces data corruption or unexpected system trips in legacy distributed control networks. Automation engineers rely on this specific power supply layout to isolate high-energy distribution lines from sensitive processor logic planes, ensuring deterministic performance under heavy electrical loads.
3. Core Technical Specifications
| Parameter | Value |
| Module Type | Regulated DC-DC / AC-DC Power Supply Module |
| Input Voltage | 24V DC Field Supply (Nominal) |
| Output Rating | 24V DC / 20A Regulated Logic/Field Bus Power |
| Power Consumption | Dependent on load demand (~55W max operational draw) |
| Heat Dissipation | ~187.6 BTU/hr |
| Isolation Rating | 1500V AC primary-to-secondary galvanic isolation |
| Diagnostic Features | Front-panel DC-OK and Overload LED indicators |
| Chassis Compatibility | Yokogawa CENTUM / ProSafe rack mounting assemblies |
4. Global Compliance & Industry Certifications
Auditors inspecting safety-instrumented systems and control cabinets demand complete documentation regarding electrical construction and insulation coordination.
- Expected Compliance Standards: CE Mark, UL/cUL Listed (Industrial Control Equipment), and relevant hazardous location directives (such as ATEX/IECEx Class I Div 2 where applicable).
- Safety Significance: The UL and CE framework ensures that internal transformer isolation barriers prevent primary line faults from propagating into low-voltage internal logic circuits, mitigating shock and fire hazards inside crowded marshaling panels.
- Verify specific lot certifications with Yokogawa Electric or your authorized regional distributor prior to system commissioning.
5. Long-Term Storage & Asset Preservation Guide
Power supply modules sitting idle on stockroom shelves face cumulative degradation risks, particularly regarding internal electrolytic capacitors and semiconductor junctions.
Keep the module inside its original multi-layer anti-static (ESD) and moisture-barrier packaging to protect the exposed circuit traces from atmospheric sulfur and humidity. Maintain warehouse environment parameters below 60% relative humidity to prevent oxidation on the plug-in blade connectors. If the module sits unpowered on a shelf for longer than two years, a controlled voltage-reforming procedure on the internal electrolytic capacitors is strongly recommended before inserting the unit into a live rack.
6. Physical Installation Prerequisites
Thermal management inside dense control enclosures dictates the lifespan of internal switching components. Leave at least 50mm of unobstructed vertical clearance above and below the power module rack to allow proper natural convection airflow across the heatsink fins. Ensure the module is pushed completely home into the backplane connector and lock the mechanical retaining levers securely to maintain low-impedance grounding paths.
7. Buyer’s FAQ
- What is the appropriate Harmonized System (HS) tariff code for international shipping of this power supply?
- Industrial power supplies and voltage converters generally fall under HS Code 8504.40 (Static converters). Confirm precise classification bindings with your local customs broker.
- Does this power module require any pre-installation programming or configuration?
- No, the PS-502-01 is a hardware-configured power conversion module and does not store software configuration images or user programs.
- What are the logistics considerations regarding the Country of Origin (COO)?
- Manufacturing origins for this legacy platform typically trace back to Japan or authorized regional assembly facilities; check the exterior shipping box label for precise traceability data.
- What packaging protocols are mandatory for secure freight transit?
- Ship the module using double-walled corrugated cartons with thick anti-static foam padding to isolate internal magnetic cores and components from severe shock and drop events.
Yokogawa NFPW444 – I/O Module for Yokogawa CENTUM VP Control Systems YOKOGAWA CP471-00 – CENTUM VP Processor Module Yokogawa CP451-51 – Field Control Unit (FCU) Processor Module
- Ship the module using double-walled corrugated cartons with thick anti-static foam padding to isolate internal magnetic cores and components from severe shock and drop events.




