Technical Parameters Basic Information Brand: ALSTOM Part Number: 55999-943-01 Form Factor: Standard 3U slide-in rack pluggable module Matching System: EP3-E-4-EN / EPIC-III traction CPU, analog sampling boards, IGBT gate drive PCBs, rack auxiliary power supply Application: European urban metro, light rail traction converter vehicle communication, safety logic signal processing Control Power Supply Rated working voltage: DC 24V vehicle control power Operating range: 18 VDC ~ 30 VDC Max power consumption: 8.7 W Protection: Reverse polarity diode, TVS surge filter, input overcurrent fuse Opto-Isolated Digital IO Channels Digital Inputs (DC24V) Pantograph status feedback, high voltage earthing switch, cabinet safety door interlock, emergency stop chain, cooling fan running signal, inverter ready feedback Digital Outputs (DC24V Relay Drive) Traction enable output, electric braking activation, system general fault alarm, cooling fan control, high voltage permission contact drive All IO with built-in EMI filter to suppress transient interference from vehicle power grid Dual Independent Communication Interfaces Internal rack proprietary backplane bus Exchange real-time traction data: torque command, DC-link voltage, module temperature, fault codes with main traction CPU Isolated external TCMS train bus Upload operating status, historical fault records to vehicle diagnostic unit; receive whole-vehicle traction/brake, speed limit, fault reset commands from TCMS master Mechanical Specifications Overall dimension: H130 mm × W98 mm × D220 mm PCB protection: Full acrylic conformal coating, anti-moisture, anti-corrosion, anti-dust, anti-mold Front panel LED indicators: Power OK, Rack Bus Active, TCMS Bus Link, System Fault Alarm Fastening: Anti-loose lock buckle, stable contact under long-term vehicle vibration Railway Environmental & EU EN Compliance Operating temperature: -25 ℃ ~ +70 ℃ Storage & transport temperature: -40 ℃ ~ +85 ℃ Relative humidity: 5% ~ 95% non-condensing Vibration standard: IEC 61373 railway rolling stock Shock resistance: 12g half-sine wave impact test EMC standard: EN 50121-3-2 railway vehicle electromagnetic compatibility Fire safety grade: EN 45545-2 HL2 low smoke, low toxicity flame retardant