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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Foxboro (Invensys / Schneider Electric) |
| Model Number | P0926AH-B / P0926AH |
| Product Type | Industrial Power Module |
| System Compatibility | Foxboro I/A Series / Foxboro Evo DCS |
| Input Voltage | 85–264 VAC (nominal 220 VAC) |
| Switching Frequency | Up to 30 kHz |
| Protection Features | Over-voltage, over-current, short-circuit, thermal shutdown |
| Redundancy Support | Yes – dual-module load sharing |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | –40 °C to +85 °C |
| Mounting | Standard single-width FBM power module form factor |
| Approx. Weight | 0.091 kg (0.2 lbs) |
| Isolation | Galvanic isolation between AC input and DC outputs |
4. Product Introduction
The Foxboro P0926AH-B is an industrial power supply module for Foxboro I/A Series and Evo distributed control systems. It converts wide-range 85–264 VAC utility power into regulated DC for baseplate-mounted Fieldbus Modules (FBMs) and control processors using high-frequency switching technology.
This module is selected when a compact, efficient power source with built-in protection and redundant capability is required. It supports dual-module configurations for higher availability in process plants.
P0926AH-B
P0926AH-B
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No DC output / system modules dead | No AC input or internal failure | ✅ High | Measure 85–264 VAC at input terminals | Confirm upstream AC and fuses before replacing module |
| Output voltage low or unstable | Overload or failing unit | ✅ High | Measure DC output under load | Check total current draw; replace if voltage sags |
| Module runs hot / thermal trip | Poor ventilation or high ambient | ✅ Medium | Measure surface temperature | Improve airflow; confirm ambient stays within rating |
| Redundant pair both offline | Common AC feed problem | ❌ Low | Check AC supply to both modules | Fix AC source first |
| Intermittent power loss | Loose connectors or failing unit | ✅ High | Reseat module and monitor voltage | Replace if voltage drops under normal load |
| Status LEDs dark on power-up | No AC or blown internal protection | ✅ High | Verify AC presence and polarity | Replace module after confirming AC is correct |
If problems continue after verifying AC input and load current, send photos of the module labels and any diagnostic indicators to technical support.
6. Frequently Asked Questions (FAQ)
Q: Is P0926AH-B the same as P0926AH?
A: Yes. The -B suffix indicates a hardware revision. Both are treated as the same industrial power module for I/A Series systems.
Q: Can two of these modules be used for redundancy?
A: Yes. The design supports dual-module redundant power sharing on the backplane.
Q: What is the input voltage range?
A: 85–264 VAC. It accepts standard worldwide utility voltages without jumper changes in most cases.
Q: Does this power the entire I/A Series rack?
A: It supplies regulated DC to the FBM baseplates and associated processors on the backplane it is installed in. Multiple power modules may be required for larger systems.
Q: Why is new-surplus pricing lower than current list?
A: These units come from excess project inventory. They are unused original Foxboro product, tested, and carry a 1-year warranty. They are not refurbished.
Q: Any installation precautions?
A: Verify the AC feed matches the module rating. Ensure adequate ventilation. When replacing, confirm the total load current stays within the module’s capacity and leave a safety margin. Use proper ESD practices when handling.
