Product Core Brief
- Model: IEPAS02
- Brand: ABB
- Series: Bailey Infi 90 / Symphony Harmony
- Core Function: Converts 120/240 VAC into regulated +5, +15, -15, and +24 VDC rails for Infi 90/Harmony rack modules.
- Product Type: AC system power supply module
- Key Specs: 120/240 VAC input | +5/+15/-15/+24 VDC output | N+1 load-sharing redundancy
- Condition: New Original / New Surplus (subject to available stock)
Key Technical Specifications
| Parameter | Detail |
|---|---|
| Product Type | AC system power supply module |
| Compatible System | ABB Bailey Infi 90 / Symphony Harmony |
| Input Voltage | 120/240 VAC, 50/60 Hz |
| Output Rails | +5 VDC, +15 VDC, -15 VDC, +24 VDC |
| Redundancy | N+1 load sharing |
| Mounting | Module Mounting Unit (MMU) or Power Mounting Unit (PMU) |
| Status Indication | Front-panel LED (green = normal, red = fault) |
| Typical Inrush Current | 0.8 A RMS (peak factor ~3.0) |
| Protection | Overcurrent, overvoltage, short-circuit protection |
| Packaging | Anti-static, industrial shipping pack |
Product Introduction (No Fluff)
The ABB IEPAS02 is an AC system power supply module for Bailey Infi 90 and Symphony Harmony DCS racks. It accepts 120/240 VAC input and distributes regulated +5, +15, -15, and +24 VDC to controllers, I/O, and communication modules across the backplane.
Its N+1 redundancy architecture makes it a practical choice for legacy system maintenance. Multiple units share the load, so a single module failure does not collapse the rack. This unit also supersedes the earlier IEPAS01 and remains compatible in mixed configurations.
QA & Testing SOP (Dynamic & Transparent)
Every unit goes through a hands-on electrical verification before it leaves our bench.
- Incoming inspection: Verify model marking, housing condition, connector pins, and label consistency. Cross-check against OEM documentation.
- Anti-counterfeit check: Inspect PCB finish, label font, serial formatting, connector quality, and mounting hardware for non-OEM signs.
- Bench power-up: Apply rated 120/240 VAC on a controlled test supply. Confirm soft-start behavior, absence of abnormal noise, and stable LED indication.
- Output rail verification: Measure +5, +15, -15, and +24 VDC with a calibrated Fluke multimeter. Check regulation, ripple, and cross-load stability under each rail.
- Redundancy simulation: When test fixtures allow, validate load-sharing behavior with a second compatible unit or simulated parallel condition.
All units are packed in anti-static bags with edge protection. If a nameplate rating is unclear, we hold the unit and request confirmation rather than guessing.
Installation Pitfalls & Guide (Engineer to Engineer)
This is a rack power module, not a field device. Treat it like backbone infrastructure.
❗ Do not assume input voltage. Confirm the nameplate reads 120/240 VAC before energizing. Wrong input kills modules fast.
❗ Respect N+1 rules. Never pull the last active supply while the rack is live. Verify redundant units are carrying load first.
❗ Watch MMU slot limits. In a Module Mounting Unit, do not install more than two IEPAS02 modules per unit for thermal and power distribution reasons.
❗ ESD discipline is non-negotiable. Use a grounded wrist strap and anti-static bag. Pencil marks on DIP switches or connectors can cause intermittent faults.
Replacement steps
- Pre-install: Confirm model, input rating, output rails, and rack slot compatibility.
- Removal: Reduce load or confirm redundant units are active. Loosen mounting hardware and withdraw the module evenly.
- Install: Inspect backplane pins, seat the module fully, and secure mounting screws to spec.
- Power-on test: Measure each DC rail at the bus monitor test points, confirm LED status, and verify rack health before returning to full load.
Technical FAQ
Is the IEPAS02 still available?
Yes, we carry it as new surplus and OEM replacement stock. Availability changes by batch, so confirm current quantity before planning a shutdown.
Can I replace an IEPAS01 with an IEPAS02?
Yes. The IEPAS02 is the direct successor to the IEPAS01, and both can coexist in the same cabinet.
What is the warranty?
Typical surplus warranty runs 30–90 days, depending on stock condition. New original units may qualify for longer coverage. We state the exact term on the quote.
Does it support hot-swap?
Only when the rack is configured for N+1 redundancy and the remaining supplies can carry the full load. Never pull the last active supply without confirming rack status.
Can you test it before shipping?
Yes. We perform bench power-up, output rail checks, and visual authenticity inspection. If your site requires a test report, ask before ordering.
