Product Overview

The 100% Brand New GE IC694PWR321B provides regulated DC power to the PACSystems RX3i Universal Backplane. It converts a wide range of AC or DC input voltages into stable 5 VDC logic power and 24 VDC relay/isolated power for the CPU and I/O modules. This module typically occupies the leftmost slot of an RX3i expansion or remote rack, ensuring distributed power integrity across large automation systems without requiring external power conditioning.

Technical Specifications

•  

  Part Number: IC694PWR321B

   

•  

  Platform: GE PACSystems RX3i / Series 90-30 (Universal Backplane)

   

•  

  Input Voltage Range: 85 to 264 VAC (47-63 Hz) or 100 to 300 VDC

   

•  

  Total Output Power: 30 Watts Maximum

   

•  

  Output Rails:

   

•  

  +5 VDC Logic (Up to 3.0 A / 15 W)

   

•  

  +24 VDC Relay (Shared 30 W budget)

   

•  

  +24 VDC Isolated (Shared 30 W budget)

   

•  

  Hold-Up Time: 20 milliseconds minimum (at nominal line voltage)

   

•  

  Isolation: 1500 VAC (Input to Backplane/Output)

   

•  

  Protection: Electronic over-current shutdown, Short-circuit protection, Internal Input Fuse (2A)

   

•  

  Indicators: PWR (Power Present), OK (Output Healthy), RUN (System Run)

   

•  

  Operating Temp: 0°C to 60°C (32°F to 140°F)

   

•  

  Dimensions: 250 x 175 x 60 mm (approx.)

   

•  

  Weight: 1.2 kg 

   

Engineering Advantages

•  

  Global Input Compatibility: The module accepts any standard industrial voltage from 85–264 VAC or 100–300 VDC. Engineers deploy the same 100% Brand New spare part in facilities worldwide without worrying about regional power grid variations (120V/208V/240V AC or 125V/250V DC battery banks).

   

•  

  Noise Isolation for Sensitive Electronics: The supply provides three isolated output channels. The 5 VDC rail powers sensitive CPU logic, while the separate 24 VDC isolated rail drives field devices (like sensors or solenoids). This prevents electrical noise and ground loops from field wiring from disrupting the processor's operation.

   

•  

  Fault Tolerant Operation: The 20 ms hold-up time keeps the rack powered during brief input power interruptions or contactor bounce. This prevents the CPU from dropping out and triggering a full system restart during minor utility fluctuations, maintaining process continuity.

   

•  

  Simplified Load Management: The 30 Watt total power budget forces designers to calculate I/O loading accurately. The front panel LEDs (PWR, OK, RUN) instantly show if the rack approaches overload or experiences a short circuit, allowing maintenance staff to isolate faulty I/O cards quickly without multimeters.

   

FAQs

•  

  Where must I install the IC694PWR321B in the rack?

  You must install the module in the leftmost slot (Slot 1) of the RX3i Universal Backplane (e.g., IC694CHS392, IC694CHS398). It physically keys into the backplane power bus to distribute energy to the right-side slots. Installation in any other slot will not power the rack.

   

•  

  Can this power supply run a main CPU rack?

  Yes. While often used as an expansion/remote rack supply, the IC694PWR321B fully supports main racks containing a CPU. However, for high-density main racks with maximum I/O loading, engineers often specify the IC694PWR322 (higher wattage) or IC694PWR331 (redundant) to ensure adequate margin.

   

•  

  Does the "B" suffix change the electrical specifications?

  The "-B" suffix generally indicates a later manufacturing revision or specific firmware/hardware updates compared to the base IC694PWR321. Electrically and mechanically, it functions as a direct replacement. The 100% Brand New IC694PWR321B drops into existing systems configured for the standard version without software changes.

   

•  

  What does the "OK" LED being off indicate?

  If the "PWR" LED is on (input power good) but the "OK" LED is off, the module has detected an overload, short circuit, or over-temperature condition and shut down the outputs to protect itself. You should power down the rack, check I/O module insertion, and verify field wiring on the 24V isolated circuit before restarting.