Foxboro FPS400-24 | Direct Replacement for I/A Series Racks

Description

Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.

3. Product Introduction

When a rack power supply drops out, every module downstream goes dark — and the process does not care that the CPU was fine. The Foxboro FPS400-24 is a rack-mounted power supply for I/A Series systems, delivering a regulated 24 VDC rail from facility AC. It seats in a designated backplane slot and feeds the modules that handle control and I/O. The practical edge is replacement speed: a bench-tested spare gets the rack back before the OEM lead time closes your maintenance window (—though your mileage may vary depending on rack revision and load).

FPS400-24

FPS400-24

FPS400-24

FPS400-24

FPS400-24

4. Key Technical Specifications

5. Field Application & Technical Pitfalls (The Engineer’s Guide)

Where this module is critical:

• I/A Series control racks running continuous process units where loss of the 24 VDC rail takes down every module in the backplane.
• Redundant power configurations where one supply carries the load and the second must share or pick up without a voltage dip.
• Legacy DCS installations kept alive because the process side still runs and a controls migration is a capital project, not a maintenance order.

Three pitfalls that bite during replacement:

• Input voltage selection and tap/jumper settings. Warning: a supply configured for the wrong input range can power up on the bench and fail in the cabinet — or worse, let the magic smoke out on first energize. Confirm the site voltage and the input configuration against the OEM drawing before you mount it.
• Output load sharing and redundant pairing. Warning: in a redundant pair, the replacement must match the partner’s output setting and load-sharing behavior. A mismatched pair can look healthy on the front panel while one supply carries the entire load — until it does not. Verify sharing after power-up, not just the OK LED.
• Residual charge, backplane seating, and ESD. Warning: the input filter capacitors can hold a charge after the disconnect opens. Wait, meter the terminals, then ground yourself before touching the backplane connector. Confirm the edge connector is fully seated before energizing; a partially seated supply can arc and fault the rack.

Lesson learned: A technician replaced a failed supply with a spare set for 240 V input. The cabinet fed 120 V. The unit powered up, ran for a few minutes, then dropped the rack. Root cause: nobody checked the input configuration against the site voltage. The supply was good; the setting was not. One unplanned outage later, the work order gained a voltage verification step.

6. Quality Control (QC) SOP & Transparency

1. Inbound Verification. Each supply is checked against the OEM packing list, label typography, serial number format, and date-code range. Input configuration and output rating are logged before the unit enters stock.
2. Live Rig Testing. The supply is mounted on a bench fixture with a resistive load bank and a variable AC source. We power on at the rated input, confirm the 24 VDC output, and run it under load for a burn-in period while logging voltage and ripple.
3. Parameter Testing. Output voltage regulation, ripple, input current draw, and insulation resistance are checked against the OEM datasheet where published. Undocumented values are flagged for buyer confirmation rather than guessed.
4. Final QA & Packaging. The supply ships in an anti-static bag with a QC-passed label, a test record showing the input configuration and output voltage we verified, and photos of the terminal layout when available.

7. Frequently Asked Questions (FAQ)

Can I hot-swap this supply in a live I/A Series rack? Do not assume so. Some racks support live removal for redundant supplies, but the OEM manual and your site procedure decide. If live removal is not explicitly permitted for that slot, remove rack power first.

How do I confirm it matches my rack? Send the rack model, input voltage, slot number, old supply label photo, and the load list. We cross-check the catalog number and test record before shipping. Exact fit still depends on the OEM support matrix for your rack revision.

What’s the warranty? 12 months from delivery for functional failure under normal operation. Fuses and other consumables carry a 90-day replacement guarantee.

How can I tell genuine OEM from refurbished? Genuine units carry the original Foxboro label with consistent typography and a traceable serial number. Refurbished units carry our QC tag in addition to the OEM label, and we disclose condition on the quote.

What is the actual load capacity? The catalog number points to a 400 W class unit, but the exact derating depends on ambient temperature and input voltage. Verify the load budget against the OEM datasheet before you size a replacement.

Will it work in a redundant pair? Only if the output setting and load-sharing configuration match the partner supply. Send us the partner’s label details and we will confirm what we can before shipment.

What do you need to quote the right replacement? Rack model, input voltage, slot number, old label photo, and the load list. That five-minute upload prevents most wrong-part returns.