Technical Parameters Basic Information Brand: Alstom Converteam Model: EPIC-III Type: Traction drive master digital controller Matching platform: Alstom metro light rail traction converter rack Installation: Standard 3U slide-in pluggable rack module Power Supply Rated input voltage: DC 24V vehicle control power Operating range: 18 VDC ~ 30 VDC Max power consumption: 18 W Built-in protection: Reverse polarity protection, TVS surge suppression, hardware overcurrent fuse Control & Processing Performance Main processor: High-speed floating-point DSP Closed-loop torque control cycle: ≤100μs Program storage: 2MB non-volatile flash memory Fault storage: 1000+ timestamped fault records + waveform snapshot Algorithm: Induction motor vector control, regenerative braking logic, inrush current suppression Signal Interfaces Analog sampling: Multi-channel DC-link voltage, phase current, motor temperature 4–20mA sensor input Encoder interfaces: Dual incremental encoder channels for motor speed & rotor position feedback Isolated DI: 16-way DC24V contact feedback for contactor, brake, door interlock Fast DO: 8-way isolated transistor outputs for IGBT trigger boards Communication: Internal rack proprietary backplane bus + vehicle CAN bus Mechanical Specifications Overall size: H130 mm × W100 mm × D220 mm PCB protection: Full acrylic conformal coating against damp, dust and corrosion Front panel: LED indicators for power, run, communication, hardware fault Fastening: Front lock buckle for anti-loosening under vehicle vibration Railway Environmental Standards Operating temperature: -25 ℃ ~ +70 ℃ Storage temperature: -40 ℃ ~ +85 ℃ Relative humidity: 5%–95% non-condensing Vibration test: IEC 61373 rolling stock standard Shock resistance: 15g half-sine wave impact EMC standard: EN 50121-3-2 railway vehicle electromagnetic compatibility Fire safety: EN 45545-2 HL2 low-smoke flame retardant