Description
Product Core Brief
- Model: 5A26304G02
- Brand: Westinghouse / Emerson Ovation heritage
- Core Function: Converts incoming AC to multiple stable DC rails that feed I/O boards inside an Ovation style rack
- Product Type: Cabinet power supply board, plug in card format
- Key Specs: Card plug in structure fitting standard Ovation chassis, multi stage filtering, overvoltage, undervoltage, overcurrent and short circuit hardware protection, status LEDs, power on self test
- Condition: New Surplus / Pulled Used, nameplate photo required
Product Introduction
Westinghouse 5A26304G02 is most often listed as an Ovation cabinet power supply board that handles AC to DC conversion and feeds several DC rails to the I/O boards in the rack, with filtering to reduce grid harmonic effects and built in protection against overvoltage, undervoltage, overcurrent and short circuits.
Not every seller agrees. Some stock pages call it a generic PLC input output module, and others just dump it into a long Westinghouse Ovation, WDPF and WEStation spare list with no description at all. That mismatch is the main buying risk. Confirm the nameplate and your cabinet drawing before you energize anything.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 5A26304G02 |
| Brand Grouping | Westinghouse, Emerson Ovation heritage |
| Product Class | Cabinet power supply board per supplier descriptions |
| Mounting | Plug in card for standard Ovation style chassis |
| Output | Multiple isolated DC rails for rack I/O boards |
| Protection | Overvoltage, undervoltage, overcurrent, short circuit |
| Diagnostics | Status LEDs and power on self test |
| Coating | Conformal coating claimed for humidity and dust |
| Common Failure Signs | Dead rack, random module resets, unstable rail under load, no LED, burnt smell, fan noise nearby |
| Conflicting Reseller Claims | PLC module, input output module, generic DCS card |
| Verification Method | Nameplate photo, cabinet power drawing, rail voltage, terminal layout, chassis compatibility |
| Support Path | Original Ovation or WDPF documentation, not reseller copy |
No confirmed factory datasheet is publicly available for this number alone, so treat every catalog claim as a lead until you match it to your own drawings.
Quality Control Process
Power boards get loaded and measured, not just plugged in.
- Nameplate and revision match. Confirm the full suffix and that the board really is a supply, not an I/O or interface card.
- No-load rail check with a Fluke multimeter. Verify every output rail before connecting any valuable card.
- Load bank test at 60 to 80 percent rated output. Hold for at least 30 minutes and watch for drift, shutdown or regulator heat spike.
- Ripple measurement with an oscilloscope. High ripple on the DC rail mimics bad I/O and shortens optocoupler life.
- Visual inspection for bulged electrolytics and cold solder. Age related capacitor failure is the usual cause of a supply that works cold then drops warm.
- Insulation and ground check with a Megger on the AC side before putting it into a live cabinet.
- ESD bag with desiccant. Pulled boards often sit in humid warehouses for years, and dry pack failure causes silent damage.
I once chased random I/O faults across two racks. One aging supply was dropping 3V every time large fans started. Replacing it ended the hunt.
Replacement Pitfall Guide
❗ Buying it as a PLC or I/O module. Several listings describe it as an automation input output or PLC module with no spec and placeholder pricing, which does not match the power supply description found elsewhere. Ask for a nameplate photo first.
❗ Assuming same family means direct swap. Rail count, current per rail, connector key and bracket height can differ between revisions. A board that seats may still starve the rack.
❗ Undersizing the substitute. A generic 24V supply can idle fine then shut down when solenoids, fans and relay banks pull together. Total every load, then add headroom.
❗ Ignoring ripple and grounding. A noisy rail creates phantom I/O faults and comms errors. Keep a single ground point in the cabinet and do not create loops between chassis and field shields, which matches standard Ovation shielding practice of grounding at the DCS side with the field floating.
❗ Skipping cooling and dust control. Packed dust insulates regulators and pushes board temperature up fast. Clean the chassis, confirm fans spin, then retest under load.
Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
| Original Model | Replacement / Successor Model | Compatibility Level | Migration Notes |
|---|---|---|---|
| 5A26304G02 | Refurbished same part | Needs Verification | Confirm nameplate, rail voltages, load test and capacitor condition |
| 5A26304G02 | Other Ovation rack power board revision | Needs Verification | Check rail current, connector key, bracket and cooling |
| 5A26304G02 | Westinghouse power distribution assembly such as 4D33710G01 | Not Compatible | Enclosed power distribution assembly for 115VAC, different role and mounting |
| 5A26304G02 | Generic DIN rail 24VDC supply | Needs Adaptation | Requires headroom check, ripple review, rewiring and separate fusing |
| 5A26304G02 | Dual redundant supply with diode ORing | Needs Adaptation | Improves availability, adds heat and needs branch fusing design |
| 5A26304G02 | Ovation upgrade with current generation rack power | Needs Adaptation | Full re-engineering, rewiring, FAT and operator training |
Benchmark references
- Acceptance criterion: rails stay within about 5 percent of rated value from no load to full load with no shutdown during a 30 minute burn-in.
- Stability target: ripple under roughly 100mV peak to peak at rated load, and no brownout while all cabinet loads switch at once.
