Product Core Brief

• Model: FPN1903A
• Brand: Motorola Computer Group (Artesyn / Emerson Embedded)
• Series: FPN Series Single-Slot VME Chassis Regulated Power Supply family
• Core Function: Convert mains AC input to regulated DC rails for VME backplane, supplying stable +5V, ±12V power to all installed SBC and I/O boards
• Product Type: Single-height 6U VME Eurocard plug-in power supply module
• Key Specs: +5V 30A main output | ±12V auxiliary rails | 85–264V universal AC input | OVP, OCP, thermal shutdown protection
• Note: OEM production fully discontinued; only fully tested refurbished inventory available. Compatible with legacy 68K and mid-tier PowerPC VME rack systems.

Key Technical Specifications

• AC Input Range: 85 VAC to 264 VAC universal single-phase, auto-ranging, 47–63 Hz line frequency
• Main DC Output: +5 VDC, continuous rated 30 A, total 150 W nominal power
• Auxiliary DC Outputs: +12 VDC 4 A, -12 VDC 2 A, combined 72 W auxiliary capacity
• Total Continuous Rated Power: 222 W under nominal cabinet airflow
• Regulation Tolerance: ±1% line regulation, ±2% load regulation across 20–100% rated current
• Ripple & Noise: <120 mV peak-to-peak on +5V rail under full load
• Protection Circuits: Overvoltage protection (OVP), overcurrent protection (OCP), short-circuit auto-recovery, over-temperature thermal shutdown
• Cooling: Integrated low-speed axial cooling fan mounted to module front panel
• Mechanical Form Factor: Single-slot 6U VME Eurocard, standard dual ejector latches, power routing through P1 backplane connector
• Operating Ambient Temp: 0°C to +50°C continuous operation with unobstructed chassis airflow; derate 10% above 45°C
• Compliance Standards: CE, UL, SEMI S2 certified for semiconductor manufacturing control rack infrastructure

Product Introduction

This plug-in VME power module delivers all required backplane DC rails for mixed legacy 68K and MVME5100 auxiliary controller racks found on older Lam 200mm etch hardware. It eliminates external bulk power brick wiring inside cramped control cabinets.Integrated multi-stage protection circuits shut down output power instantly during backplane short events to avoid permanent damage to costly SBC and analog mezzanine hardware. Fixed fan airflow maintains stable output regulation under 24/7 continuous fab runtime loads.

QA & Testing SOP (Transparency Building)

1. Incoming Inspection: Serial number cross-reference against OEM power component databases; visual scan for bulging electrolytic capacitors, cracked fan blades, or charred P1 connector pins. All internal fuse ratings logged pre-test.
2. Live Bench Testing: Install module to empty VME backplane; electronic load bank draws full rated +5V 30A current for continuous 24-hour burn-in. Fluke 115 monitors rail voltage ripple and fan speed stability.
3. Electrical Testing: Verify OVP/OCP/thermal shutdown trigger thresholds match OEM factory specs; measure isolation resistance >10MΩ between AC input and DC output circuits.
4. Firmware & Config Backup: No onboard user-configurable firmware; document measured rail output tolerances and fan runtime hours to encrypted test archive.
5. Final QC & Packaging: Replace degraded electrolytic capacitors and worn fan assemblies during refurbishment; clean all edge connectors with anti-tarnish solvent, wrap unit in anti-static foam, affix QC tag with full load voltage ripple metrics before sealed ESD bag packaging.

Installation Pitfalls & Guide (Engineer to Engineer)

❗ Overloading Risk: Total rack DC load must stay below 90% of the module’s 222W rating. Adding a dual PMC MVME5500 SBC plus two analog mezzanines pushes load past safe limits, triggering thermal shutdown during recipe startup. Calculate total rail draw before installation.❗ Fan Blockage Hazard: Cabinet cable bundles blocking front-panel fan intake create rapid internal temperature rise. Restrict wiring from covering module ventilation slots to avoid unplanned power cutouts mid-process.❗ P1 Backplane Pin Burn Risk: Uneven ejector latch seating creates high-resistance contact points on high-current +5V pins. Heat buildup melts connector plastic under full 30A load. Photograph fully seated alignment of the original unit pre-removal.❗ Mismatched Parallel PSU Limitation: This model lacks active current sharing logic. Do not stack multiple units in parallel to boost total power capacity; unbalanced load distribution causes premature capacitor failure.❗ Catastrophic ESD Damage Risk: Internal PWM switching control ICs are sensitive to static discharge; ESD wrist strap and grounded mat mandatory before handling exposed circuit boards or backplane contacts.4-Step Replacement Guide:

1. Pre-install: Execute full rack lockout-tagout, disconnect facility AC mains power to the chassis, export all chamber calibration parameters via tool HMI.
2. Removal: Release dual ejector latches evenly, slide module straight out of the VME slot; inspect P1 backplane pins for discoloration or burn marks before setting aside.
3. Install: Align replacement module parallel to the rack backplane, seat evenly until both latches fully lock, route cabinet wiring clear of the front cooling fan.
4. Power-on Test: Restore facility AC power, measure idle rail voltages, apply full electronic load for 30 minutes, confirm no thermal shutdown events and ripple values stay within OEM tolerance windows.

FAQ (Frequently Asked Questions)

Q: Can this power unit supply a full TCP9400 main rack loaded with MVME5500 master SBC and multiple VIOP I/O boards?A: No. A fully populated TCP9400 main rack draws sustained power above 250W, exceeding the module’s 222W continuous rating. This unit is only rated for smaller auxiliary racks with low-count 68K or MVME5100 secondary controllers.Q: Does this power module support hot-swapping while the chassis remains connected to facility AC power?A: The P1 high-current power connector has no staged hot-swap pin sequencing. Live extraction creates arc flash damage to backplane pins and triggers uncontrolled DC voltage spikes that erase controller NVRAM calibration data. Full AC mains lockout is required before removal.Q: What warranty coverage applies to refurbished stock?A: Refurbished units carry a 4-month limited functional warranty covering fan failure and output rail short events. Coverage excludes gradual capacitor capacity degradation over extended runtime; all aging capacitors are replaced during refurbishment to extend usable service life. No factory-new OEM stock remains available.Q: Will swapping this power supply erase chamber recipes and sensor calibration offsets stored on connected SBCs?A: All calibration data resides on each controller’s battery-backed NVRAM/SRAM, independent of rack power. A full AC power cycle during swap will not erase stored parameters as long as SBC onboard backup batteries hold nominal voltage.Q: Can this hardware operate with 200V industrial facility mains power without external transformers?A: The unit uses universal auto-ranging AC input, supporting 85–264VAC without manual tap adjustment. It operates stably on 200V, 208V, 220V, and 240V fab power distribution circuits.Q: What expected service window applies to refurbished units in a 24/7 high-volume fab environment?A: Target replacement window sits at 31,000 operating hours. Electrolytic capacitors lose capacitance under continuous cabinet heat, raising output ripple and triggering intermittent OCP faults that abort wafer processing batches.Q: Can multiple analog DAQ PMC mezzanines run off a single without load derating?A: Two low-channel analog mezzanines operate safely under nominal load. Three or more high-density DAQ modules push combined +5V draw past 27A, requiring a 10% power derate and shorter scheduled maintenance intervals to avoid thermal shutdown.