Description

ALSTOM EP3‑E‑4‑A EPIC‑III Distributed Controller Module

Technical Specifications

• Part Number: EP3‑E‑4‑A
• Brand: ALSTOM (GE Power legacy EPIC‑III platform)
• Warranty: One Year
• Type: Rack‑mount real‑time process controller for power‑plant auxiliary & ESP electrostatic precipitator control systems
• Power Supply: 85‑264 VAC universal mains input 50/60 Hz; max power consumption 12 W
• Processor: 32‑bit industrial real‑time microprocessor; onboard flash & RAM for control logic firmware
• Communication Interfaces:
  • RS‑485 serial port (Modbus‑RTU) for field‑device connection
  • Ethernet port for host SCADA / DCS supervisory network
  • Internal backplane bus for EPIC‑III I/O expansion racks
• Local I/O: Configurable onboard discrete / analog I/O terminals via screw‑terminal blocks
• Diagnostics: Front‑panel multi‑status LED indicators; internal watchdog; fault‑event logging; self‑diagnostic test function
• Operating Temperature: ‑10 °C ~ +60 °C cabinet‑mount; storage ‑20 °C ~ +70 °C
• Humidity: 5‑95 % RH non‑condensing
• Protection Class: IP20; for indoor cabinet‑only installation
• Mounting: Standard 19‑inch rack slot / DIN‑rail compatible metal housing
• Dimensions / Weight: 240 mm × 180 mm × 120 mm; approx 1.45 kg

Product Overview

The EP3‑E‑4‑A is Alstom EPIC‑III series distributed real‑time controller, widely deployed for electrostatic precipitator (ESP) transformer‑rectifier control and power‑plant auxiliary process loops. It executes local closed‑loop control logic, spark‑detection algorithms and power‑regulation for ESP high‑voltage TR sets. It collects field sensor signals, drives discrete outputs, and exchanges real‑time process data with upper‑level SCADA or DCS over Ethernet and Modbus‑RTU serial links. Comprehensive self‑diagnostic functions simplify on‑site troubleshooting in coal‑fired power‑plant heavy‑dust cabinet environments.

This controller addresses power‑plant auxiliary‑control challenges: dedicated ESP precipitator control capability, multi‑protocol communication for legacy plant‑system integration, drop‑in spare‑part compatibility for existing EPIC‑III retrofit‑maintenance projects. Power‑plant automation engineers, site‑maintenance technicians and retrofit integrators benefit most. Typical applications: coal‑fired power‑plant ESP electrostatic precipitator control, boiler auxiliary‑system interlock loops, flue‑gas‑treatment process control cabinets.

Key Application Notes

‑Rack‑mount controller; cannot operate standalone. Requires EPIC‑III I/O racks, engineering software for firmware download and parameter configuration, and matching field‑sensors / actuators. ‑‑Not hot‑swap capable: main AC power must be fully disconnected before module replacement. ‑‑Original OEM production discontinued; only aftermarket surplus/refurbished spare‑parts available. ‑‑Conformal‑coated PCB variant exists for high‑humidity, high‑dust plant‑cabinet environments. ‑‑Suffix variant differences (EP3‑E‑4‑A / EP3‑E‑4‑EN): do not cross‑replace without full part‑number matching. ‑‑Origin: Europe; follow Alstom EPIC‑III hardware manual for grounding, EMC‑compliant wiring and commissioning procedures.