Description
The Yokogawa PW301 is a modular power supply unit designed for legacy Yokogawa Centum XL and early CS 3000 distributed control system (DCS) architectures. It converts alternating current mains input into regulated direct current voltage rails to power system backplanes, controller CPUs, and associated input/output interface cards.
Procurement and Availability
- Condition: Refurbished / Tested Working or New Surplus (verify current stock)
- Standard Lead Time: 1 to 2 weeks
- Warranty: 12-month standard replacement warranty
- Pricing: Indicative market pricing applies; contact engineering sales for a firm quote.
Technical Specifications
| Parameter | Value |
| Manufacturer | Yokogawa |
| Model Number | PW301 |
| System Series | Centum XL / CS 3000 DCS |
| Module Type | AC/DC Power Supply Unit |
| Input Voltage Range | 100 to 200 VAC (50/60 Hz) |
| Input Current | 6.0 A max |
| Output Rails | +5.1V DC (Primary/Secondary), +12V DC (model-dependent styles) |
| Style Variant | Typically Style S4 (verify existing rack revision) |
| Operating Temperature | 0 to +50 °C (standard industrial environment) |
| Mounting Type | DCS Rack Backplane Slot |
Engineering Integration Notes
When maintaining aging Centum infrastructure, verify the specific hardware style suffix (such as Style S4) before swapping a failed PW301 module. Earlier style variants may feature different internal pinouts or backplane current limits that prevent direct interchangeability without rack modifications.
Ensure input line voltage matches the 100 to 200 VAC specification; applying incorrect line voltages to legacy supplies results in immediate primary fuse failure or component damage. Monitor the module’s front-panel status indicators during commissioning to confirm that all DC voltage rails maintain stability under full system load.
Frequently Asked Questions
Q: Is the Yokogawa PW301 interchangeable with the PW401 or PW701?
A: No. Different model numbers correspond to distinct input voltage ratings, power capacities, and backplane pin configurations. Verify your exact rack part number before replacement.
Q: Does this unit support hot-swapping in a live DCS rack?
A: While physical extraction is possible in certain redundant configurations, standard plant safety procedures dictate de-energizing the rack power feed before inserting or removing legacy power modules to prevent arcing and backplane surge stress.
Q: What is the typical lifespan expectancy for deployed units?
A: These legacy power supplies rely on electrolytic capacitors subject to thermal aging. Units operating continuously for over 15 years should have their ripple voltage tested under load prior to critical process runs.
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