GE 8910-PS-DC
GE 8910-PS-DC
GE 8910-PS-DC
GE 8910-PS-DC

GE 8910-PS-DC | Power Supply Module for RX3i Series – Field Service Notes

  • Model: 8910-PS-DC
  • Alt. P/N: IC8910PSDC
  • Product Series: PACSystems RX3i
  • Hardware Type: Power Supply Module
  • Key Feature: Dual output (5VDC @ 30A, 24VDC @ 20A) with active PFC and redundant capability
  • Primary Field Use: Provides clean, regulated power to the entire RX3i rack and powers 24VDC field devices directly from the backplane.
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Part number: GE 8910-PS-DC
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Description

Hard-Numbers: Technical Specifications

  • Input Voltage Range: 85-264VAC (47-63Hz) or 125-300VDC
  • Output 1 (Backplane): 5VDC @ 30A maximum
  • Output 2 (Field Power): 24VDC @ 20A maximum (480W total output)
  • Efficiency: 85-90% typical at full load
  • Power Factor Correction: Active PFC >0.95 @ full load
  • Hold-up Time: 20ms minimum at full load (critical for brownout survival)
  • Isolation Rating: 1500Vrms input-to-output, 500Vrms output-to-backplane
  • Operating Temperature: 0°C to +60°C (derated above 50°C)
  • Operating Temperature: -40°C to +70°C (storage)
  • Protections: Overvoltage, overcurrent, short-circuit, overtemperature
  • LED Indicators: PWR (AC/DC OK), 5V OK, 24V OK, FAULT
  • Mounting: Single-slot RX3i rack mount with forced-air cooling requirement
  • Derating: Output current must be derated by 2% per °C above 40°C ambient
    GE 8910-PS-DC

    GE 8910-PS-DC

The Real-World Problem It Solves

This module eliminates the nightmare of managing multiple external power supplies for your PLC and field devices by delivering both 5VDC logic power and 24VDC field power from a single rack-mounted unit. Its hold-up capability keeps your control system alive through momentary power dips and voltage sags that would otherwise crash your process.
Where you’ll typically find it:
  • Main control cabinets powering the entire PLC rack plus local valve islands and sensor blocks
  • Distributed I/O panels where 24VDC field device power needs to be sourced from the PLC cabinet
  • Redundant power schemes where two PS modules run in parallel for mission-critical uptime requirements
Bottom line: It’s your single-point power solution that keeps the logic running and the field devices energized without external power bricks cluttering your cabinet.

Hardware Architecture & Under-the-Hood Logic

This power supply module occupies a single slot on the RX3i backplane and connects to the AC/DC mains through a terminal block on the front face. It generates two isolated DC outputs: 5VDC for backplane logic and 24VDC for field devices, using independent switching regulators with shared input rectification and PFC circuitry.
Power flow breakdown:
  1. Input mains passes through EMI filtering and active PFC circuitry, creating a stabilized ~380VDC bus
  2. High-frequency switching converter (PWM at 100-200kHz) steps down to intermediate voltages
  3. Independent regulation stages produce isolated 5VDC and 24VDC outputs with separate feedback loops
  4. Output monitoring circuitry continuously checks voltage, current, and temperature
  5. Fault detection logic triggers protective shutdown (crowbar or foldback) on out-of-spec conditions
  6. Status LED drivers illuminate based on monitoring circuit outputs—PWR (input OK), 5V OK, 24V OK, FAULT (protection triggered)
  7. Backplane power distribution feeds 5VDC to all modules; 24VDC is available through the backplane connector or front terminal block
    GE 8910-PS-DC

    GE 8910-PS-DC

Field Service Pitfalls: What Rookies Get Wrong

Ignoring the derating curve in hot cabinetsNew engineers assume the 20A rating applies regardless of ambient temperature. When the cabinet hits 55°C, that 20A rating drops to roughly 16A. Push it beyond that and the module goes into thermal shutdown in the middle of production.
  • Field Rule: Always calculate the worst-case load, then apply the temperature derating from the datasheet. If your cabinet runs hot, oversize the supply by 20-30%.
Running at 90%+ load continuouslyRunning this PS at 18-20A continuously kills capacitors faster than you can say “unscheduled downtime.” The MTBF curve tanks when you’re living in the top 10% of the rating.
  • Field Rule: Design for 70-75% max continuous load. If you need 15A, install a 20A supply and leave headroom. You’ll replace it half as often.
Wiring parallel supplies without proper load sharingSome techs think they can just wire two 8910s in parallel to get 40A. Without active current sharing or diode OR-ing, one supply will hog 95% of the load while the other does nothing—until the first one burns up and the second gets slammed with 40A instantly.
  • Field Rule: Use GE’s official redundant power kit with diode isolation and current-sharing control. Never parallel these supplies with a cheap jumper wire.
Neglecting the hold-up time requirementIf your downstream machinery has high inertia (big motors, heavy conveyors), power loss takes longer than 20ms to clear. The PS drops out before your process completes its controlled shutdown sequence.
  • Field Rule: Calculate your required shutdown time and add external bulk capacitance if needed. Don’t rely on the 20ms internal hold-up for anything beyond basic logic preservation.
Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.

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