What Happens When a Backplane Loses Its Power Source?
Every RX3i rack depends on one module to energize the backplane. When that module fails, the whole line stops. The GE IC694PWR321B answers that problem directly: a standard-capacity power supply built for PACSystems RX3i backplanes, delivering 5 V DC logic power from a wide-range AC or DC input.
Originally developed by GE Fanuc / GE Intelligent Platforms and now owned by Emerson, this module remains a practical, ready-to-ship spare for plants running RX3i control systems.
Technical Specifications
| Specification | Value |
|---|---|
| AC input range | 85-264 V AC (rated 120/240 V AC), 50/60 Hz |
| DC input range | 100-300 V DC (rated 125 V DC) |
| Input power | 90 VA max (AC), 50 W max (DC) |
| Output | 5 V DC backplane logic |
| Operating temperature | 0 to +60°C ambient |
| Storage temperature | -40 to +85°C |
| Relative humidity | 5 to 95% non-condensing |
| Protection rating | IP20 |
| Dimensions (H×W×D) | 145 × 34 × 140 mm |
What the Wide Input Range Means for Your Panel
The 85-264 V AC and 100-300 V DC input window lets one module serve 120 V AC, 240 V AC, and 125 V DC control power schemes. That flexibility simplifies spares planning across mixed-voltage sites. The 90 VA AC and 50 W DC input figures help you size upstream protection correctly.
Where This Module Fits
Oil and gas facilities, water treatment plants, and discrete manufacturing lines running PACSystems RX3i racks all rely on this supply. In a typical upgrade, a legacy rack gets a fresh power module instead of a full backplane replacement. That keeps the existing I/O, wiring, and program intact.
For remote pumping stations on DC control power, the 125 V DC rated input suits battery-backed systems where AC availability is uncertain.
Installation and Setup
- Confirm the rack is de-energized before insertion.
- Verify input voltage against the module’s AC or DC range.
- Seat the module firmly in its RX3i slot.
- Restore power and confirm the 5 V DC backplane logic rail.
Because the output current value is not published in the available data, confirm load budgeting with Oil AutoTech before commissioning.
Reliability and Maintenance
At 0 to +60°C ambient and 5 to 95% non-condensing humidity, the IC694PWR321B tolerates harsh plant environments. The IP20 rating means it belongs inside a clean enclosure. Inspect connections periodically, keep cabinet filters clean, and monitor for heat buildup around the module.
Compatibility and Integration
This module is designed for PACSystems RX3i backplanes. If your architecture uses fieldbus networks, wiring into such networks may require an external gateway or connection module. Confirm cables and gateways with the supplier before ordering.
Selection Checklist
Before buying, verify your rack series, input voltage scheme, and mounting space. The 145 × 34 × 140 mm footprint fits standard RX3i slots. Official Emerson production status is unverified; the module is currently available in aftermarket channels as of September 2026. Please verify current lifecycle status and availability with Oil AutoTech before ordering.
Contact Oil AutoTech today for pricing and availability.
