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ALSTOM EPSD-0603 DFI-150-0003
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ALSTOM EPSD-0603 DFI-150-0003

Product Name:​ ALSTOM EPSD-0603 DFI-150-0003 — Enhanced Protection & Trip (Voting) Module for Turbine Safety System
Product Brief:​ Part of Alstom’s EPSD (Enhanced Protection System Device) family — a dedicated hardware-based protection/trip module used in turbine overspeed, vibration, or process-limit voting logic. The DFI-150 designation typically refers to a Digital Fault Input or trip-conditioning interface board within the protection chain. Works in conjunction with EP3 / T3000 racks to implement 2oo3 or 1oo2 voting for turbine trips.
Category:
Description
Typical Specifications (EPSD family):
  • Function:​ Accepts digital/voted signals from speed modules, pressure switches, or vibration monitors; performs hard-wired or software-configured voting logic
  • Inputs:​ Dry contact or 24 VDC active inputs from field trip devices
  • Outputs:​ Forced-trip relay contacts (typically form-C), failsafe de-energized
  • Response Time:​ <50 ms typical for trip assertion
  • Power:​ 24 VDC or backplane-powered depending on rack version
  • Certification:​ Designed to meet IEC 61508/ API 670requirements for machinery protection
  • Temp Range:​ –20 to +65 °C
Application:​ Gas/steam turbine overspeed protection, bearing vibration high-high trip, emergency stop pushbutton voting, fire & gas interlock trip in power plants.
Notes:​ Exact DFI-150-0003 PCB layout is a proprietary Alstom spare part — replacement must match exact firmware/EPROM version of existing EPSD rack.
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