GE IC694PWR321B 30W Power Module for PACSystems RX3i Expansion Racks

The GE IC694PWR321B is a dedicated expansion power supply module engineered for the GE Fanuc (now Emerson) PACSystems RX3i control platform. Unlike the main power supply that resides in the CPU rack, the GE IC694PWR321B serves a specific and often misunderstood role: it provides regulated backplane power exclusively to IC694 serial expansion racks, enabling the RX3i system to extend its I/O capacity beyond the physical limits of the primary chassis. This module converts a nominal input of 120/240 VAC or 125 VDC into the multiple low-voltage rails required by expansion rack modules, ensuring that logic circuitry, relay outputs, and field devices receive clean, isolated power.

As the Series B revision of the IC694PWR321 family, the GE IC694PWR321B represents the current mainstream production variant, incorporating refinements over the earlier A revision while maintaining full functional compatibility for field replacements. The module delivers a total output power of 30 watts distributed across three distinct output channels: a 5 VDC logic rail, a relay 24 VDC output, and an isolated 24 VDC output. This triple-output architecture allows a single GE IC694PWR321B to simultaneously support backplane communication, relay-type output modules, and 24 VDC field devices connected to input modules—eliminating the need for supplementary external power supplies in many expansion configurations.

It is critical for system integrators and maintenance personnel to recognize that the GE IC694PWR321B is not interchangeable with main rack power supplies such as the IC695 series. The module installs exclusively in the leftmost power slot of an IC694 serial expansion base and does not support hot-swap or load-sharing redundancy. Understanding these boundaries is essential for correct specification and reliable operation of RX3i expansion architectures.

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	GE IC694PWR321B
Manufacturer	GE Fanuc (Emerson)
Product Type	Expansion Rack Power Supply Module
Series / Platform	PACSystems RX3i
Nominal Input Voltage	120/240 VAC or 125 VDC
AC Input Range	85–264 VAC, 47–63 Hz
DC Input Range	100–300 VDC
Total Output Power	30 W maximum (combined)
+5 VDC Output	5.0–5.2 VDC, 15 W max, 3.5 A current limit
Relay +24 VDC Output	24–28 VDC, 15 W max
Isolated +24 VDC Output	21.5–28 VDC, 20 W max, 0.8 A max
Input Isolation	1500 VAC, 1 minute
Ride-Through Time	≥20 ms at full load
Operating Temperature	0°C to 60°C
Mounting Position	Leftmost power slot, IC694 expansion base

Main Features and Advantages

Purpose-Built for RX3i Expansion Architecture

The GE IC694PWR321B exists because RX3i systems require independent power regulation for each expansion rack. When a control system outgrows its primary chassis, serial expansion bases extend I/O capacity without adding CPUs or duplicating controller hardware. Each expansion base, however, needs its own local power source to drive the backplane and installed modules. The GE IC694PWR321B fills this role precisely, converting cabinet power into the regulated rails that expansion modules expect. This architecture keeps power distribution modular and manageable, allowing technicians to service or upgrade individual expansion racks without disrupting the main controller.

Triple-Output Design Eliminates Auxiliary Supplies

A single GE IC694PWR321B provides three distinct output channels: 5 VDC for backplane logic, 24 VDC relay power for output module circuitry, and an isolated 24 VDC supply for field devices wired to input modules. This consolidation means that a typical expansion rack containing mixed discrete and analog I/O can operate from one power module without requiring separate DIN-rail supplies for relay or sensor power. The isolated 24 VDC output is particularly valuable because it maintains electrical separation between the backplane and field wiring, reducing noise coupling and protecting sensitive logic circuits from ground faults or transients originating in the field.

Robust Input Range and Ride-Through

The GE IC694PWR321B accepts an exceptionally wide input range—85 to 264 VAC or 100 to 300 VDC—making it suitable for deployment across global power standards without jumper changes or external transformers. Equally important is its 20-millisecond minimum ride-through capability at full load. During brief mains interruptions or voltage sags, the module maintains output regulation long enough for the control system to ride through disturbances that would otherwise cause module resets or communication losses. In continuous-process industries where even momentary disruptions trigger costly restart sequences, this ride-through performance contributes directly to operational stability.