Description
Product Introduction
The Westermo PS-02 is a heavy-duty, DIN-rail mounted power supply unit specifically engineered to power harsh-environment networking equipment, serial modems, and line drivers (such as Westermo RV-01 and RV-01A series). Built to withstand high electromagnetic interference (EMI) and extreme cabinet temperatures, the PS-02 converts incoming AC mains power into a tightly regulated 12V DC output rail.
What differentiates the PS-02 from standard commercial power bricks is its robust internal galvanic isolation and heavy-duty surge suppression. Commercial power supplies tend to fail under high-voltage switching transients common in substation or heavy-factory electrical cabinets. The PS-02 ensures steady voltage delivery to critical communications hardware, preventing ground loops, packet loss, and serial link drops.
Key Technical Specifications
| Parameter | Value / Specification |
| Part Number | PS-02 (Art. No: 3120-1001 / 3120-1910) |
| Input Voltage Range | 100 – 240 VAC (50/60 Hz) |
| Nominal Output Voltage | 12 V DC (\pm 3\%) |
| Rated Output Current | 3.0 A Max |
| Isolation Rating | Galvanic isolation between primary AC input and secondary DC output |
| Mounting Configuration | 35mm Standard DIN-Rail Mounting |
| Housing Construction | High-impact, flame-retardant industrial enclosure (IP20/IP40) |
| Operating Temperature | -20°C to +60°C |
| Protection Features | Short-circuit protection, overvoltage cutoff, input surge suppression |
PS-02
PS-02
Application Scenarios & The “Trench” Experience
Picture this: It’s 2:00 AM, and an offshore platform or trackside signaling system drops its fiber-optic serial link. The network switch and media converters are unpowered, taking down telemetry to the main SCADA system. You trace the failure to a cheap commercial 12V power supply that overheated inside an unventilated control panel. Swapping in a hardened, industrial-grade Westermo PS-02 unit restores stable 12V power instantly, withstanding ambient panel temperatures up to 60°C without thermal degradation.
- Railway & Trackside Infrastructure: – Serial Modems & Fiber Converters – Delivers ripple-free power to trackside signaling modems subject to high vibration and EMI spikes.
- Wastewater & Municipal Utilities: – Remote Telemetry Units (RTUs) – Powers long-haul telemetry converters inside outdoor enclosures subject to temperature fluctuations.
- Power Substation Automation: – Substation Network Interfacing – Provides high galvanic isolation to prevent ground loop noise from propagating across communication lines.
Transparency SOP: Quality Assurance & Testing
We don’t just ship boxes; we test them on actual Westermo networking load rigs. Every PS-02 power supply module passes a strict 5-step testing protocol:
- Inbound Visual & Mechanical Inspection: Checking terminal block integrity, housing clips, DIN-rail mounting springs, and checking for signs of historical thermal distress.
- AC Line Power-On & Cold Start: Energizing the primary side at full line input voltage (115VAC and 230VAC) to check soft-start inrush current behavior.
- Full-Load Burn-In Test: Applying a 3A resistive load to the 12VDC output rail for two hours while monitoring voltage stability and ripple using an oscilloscope.
- Short-Circuit & Over-Current Foldback: Intentionally shorting the DC output terminals to confirm automatic current-limiting foldback and rapid recovery upon short removal.
- Anti-Static (ESD) Packaging: Sealed in protective anti-static bags with custom foam padding to prevent mechanical damage during transit.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
- ⚠️ Do Not Exceed Thermal Thresholds without De-rating: While the PS-02 is rated for harsh conditions, mounting it directly adjacent to high-heat components (like motor drives or braking resistors) without a 10mm air gap on the DIN rail will shorten the lifespan of its electrolytic smoothing capacitors. Always leave vertical ventilation space above and below the unit.
- ❗ Verify Wire Gauge and Terminal Torque: Loose screw terminal connections on the AC input side cause high-resistance heating points that burn out module connector blocks. Torque all screw terminals to manufacturer specs during maintenance checks.
- ⚠️ Check Output Voltage Before Connecting Sensitive Modems: If you are installing a refurbished or surplus unit that has been in storage, power it up under zero load first and verify 12.0V DC output on a multimeter. A drifting output voltage indicates internal feedback circuit degradation.
Frequently Asked Questions (FAQ)
Q: Can the Westermo PS-02 be used to power third-party 12V DC industrial gear?
A: Yes. Although designed primarily for Westermo serial-to-fiber converters and modems (like the RV-01 series), the PS-02 outputs a standard 12V DC rail and can power any 12V DC industrial device within its amperage rating.
Q: Is the PS-02 hot-swappable on the DIN rail?
A: You can unclip the physical housing from the rail while powered, but you should never connect or disconnect the primary AC terminal wiring live. Always de-energize the incoming AC line circuit breaker before servicing wiring.
Q: What causes the output LED on the PS-02 to turn off or flicker?
A: An unlit or flickering DC status LED indicates an active short circuit on the 12V output line, an over-temperature thermal shutdown, or an internal primary-side fuse failure caused by an AC line surge.
Q: Why choose surplus Westermo PS-02 units over modern commercial power supplies?
A: Modern commercial power bricks lack the specific EMC ratings, isolation voltage, and thermal tolerances required by legacy Westermo network hardware. Installing a genuine, factory-tested PS-02 guarantees exact physical footprint, electrical compatibility, and long-term network uptime.
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