Technical Specifications

Main Features and Advantages

Railway-grade environmental hardening as default. The DCA2000A​ is built to EN 50155 (electronic equipment on rail vehicles) and IEC 61373 (vibration/shock) — not industrial-grade (IEC 60721-3-3), railway-grade. That means the PCB is conformal-coated (polyurethane, typically 50 µm), the connectors are vibration-lock (often Harting Han or TE heavy-duty, keyed), the power input has reverse-polarity and surge protection (110 V DC battery can see load-dump spikes from compressor start, the DCA2000A‘s internal DC/DC absorbs it), and the operating envelope covers –25°C (Northern Sweden DMU in January) to +70°C (electrical cabinet behind the driver’s desk in Athens metro in July). For a depot engineer, this means the 3EST13-151​ doesn’t fail because the train sat overnight at –18°C — it fails (rarely) because of connector oxidation after 12 winters of road salt aerosol.Native MVB integration without gateway. The DCA2000A​ speaks MVB slave natively (IEC 61375-3-3), which is the standard vehicle bus on BT’s MITRAC/ORION fleets. The module auto-enumerates on the MVB segment (typically one I/O rack = one MVB slave node, 8–16 modules sharing the node address), and the VCU sees each analog channel as a 2-byte process-data word in the MVB telegram — no OPC wrapper, no Profibus gateway, no “why is my AI not in the VCU tag list” mystery. The DCA2000A‘s channel-to-MVB mapping is done in the vehicle’s TMS engineering tool (Bombardier’s “MITRAC Engineering” or “ORION Configurator”) — each DCA2000A channel gets a signal name (e.g., “Bogie1_BearingA_Temp”, “BC_Pressure_Front”), a range (4–20 mA = 0–150°C or 0–10 bar), and alarm limits (Alert / Danger) that the VCU’s application logic consumes. If you swap a DCA2000A​ for another DCA2000A​ (same 3EST13-151), the MVB node ID is on the rack backplane or set by DIP — the VCU re-enumerates on next power-up and the signal names map back correctly provided the channel wiring is identical (which it is in a like-for-like swap).Mixed-range per channel, 4–20 + 0–10 on same module. The DCA2000A​ typically allows mixing on the same 8/16-ch module: channel 1 = 4–20 mA (brake pressure, 0–10 bar), channel 2 = 0–10 V (HVAC supply temp, 0–50°C mapped), channel 3 = 4–20 mA (bearing temp, Pt100→4–20, 0–150°C), channel 4 = 4–20 mA (fuel level, 0–100%). The range per channel is software-configured in the TMS tool (gain/bias loaded to the DCA2000A’s EEPROM during vehicle commissioning) — no jumper, no DIP, no resistor change. For a DMU with 6 AI loops (brake, pantograph, 2× bearing, fuel, compressor-discharge) + 2 spares, one DCA2000A​ (8-ch) covers it, and the 0–10 V HVAC temp can share the same module with the 4–20 mA pressure loops. This density matters on a car-body where the electrical cabinet is ~600 mm wide and houses VCU + TCU + I/O rack + battery charger + circuit breakers — every DIN-profile millimetre counts.Sensor-break and range diagnostics. Each channel on the DCA2000A​ monitors loop continuity (4–20 mA) or under/over-range (0–10 V). A broken Pt100→transmitter loop (vibration at the bogie bearing pedestal loosens the terminal) reads <3.6 mA (or whatever the BT underrange threshold is, typically 3.6 mA = “sensor break” flag) — the DCA2000A​ flags the channel “Fault” on MVB, the VCU’s application logic escalates to “Bearing Temp Unavailable — reduce max speed to 80 km/h” (typical BT DMU/EMU fault-tree), and the driver sees a yellow “Limited Performance” on the cab HMI instead of a red “Stop Immediately.” This graceful degradation is why railway I/O spends the extra € vs. industrial — the train is moving passengers, not widgets.

Application Field

The 3EST13-151 (DCA2000A)​ deploys wherever BT-built rolling stock needs analog monitoring on a per-car basis. A Toronto Rocket (BT-built, 6-car married-pairs, TTC subway) has an electrical cabinet per car-body (3 cabinets per 6-car train, one per married-pair + one middle). Each cabinet houses a BT I/O rack with one DCA2000A​ (8-ch): channels 1–4 = bogie-bearing temp (2 bogies × 2 bearings, 4 AI, Pt100→4–20), channel 5 = brake-cylinder pressure (front bogie, 4–20 mA from the Knorr-Bremse transducer), channel 6 = pantograph pressure (EMU portion of the fleet, 4–20), channels 7–8 = spare / HVAC supply temp. The MVB ties all three cabinets into the train’s MITRAC VCU (one VCU per 3-car set, redundancy: 2× VCU per 6-car). During a winter storm, if bearing A on bogie 2 spikes to 112°C (normal 65–80°C), the DCA2000A​ reports 19.2 mA (112°C mapped: 4 mA=0°C, 20 mA=150°C → 19.2 = 112.5°C), the VCU’s bearing-temp logic trips “Bearing Alert” → speed limit 50 km/h, driver HMI yellow, depot gets a “Bearing A2 Hot” event on the TMS remote-monitoring (if the fleet has GSM/GPRS telemetry). The maintenance team pulls the car at the next terminal, swaps the DCA2000A​ only if the fault is “channel A2 reads 3.2 mA” (sensor break, could be transmitter or wiring) — they’ll megger the Pt100 first, but the DCA2000A​ channel fault bit tells them which bearing to look at without crawling under all 4 bogies.On a UK Regional DMU (Bombardier Talent 2, 3-car, diesel-electric), the DCA2000A​ in the motor-car cabinet lands: compressor-discharge pressure (4–20), fuel-level (0–10 V from sender), coolant temp (4–20 from the engine ECU’s analog out), exhaust-temp-bank-A (4–20), bogie-bearing (4× 4–20). The VCU (MITRAC) uses compressor-discharge + fuel-level for the driver’s HMI “Compressor Load %” and “Fuel Remaining km”, and uses bearing + coolant + exhaust for the “Engine Derating” logic (coolant >95°C → reduce engine RPM 5%, exhaust >650°C → reduce fuel-rack). The DCA2000A​ here is saloon-mounted (cabinet behind driver’s desk, –10°C to +55°C), so vibration is IEC 61373 Cat 1 Class B (saloon), not bogie. Depot spares: 2× 3EST13-151​ per 6-DMU fleet (one per depot store, one float between 3 depots) is typical.On a Montréal AZUR metro (BT-built, 9-car, rubber-tired, fully automated / driverless), the DCA2000A​ is in each car’s underframe cabinet (bogie environment, –25°C to +70°C, IEC 61373 Cat 1 Class A bogie-rated) — harsher than saloon. The road-salt aerosol from the tunnel ventilation (cars pass each other at 45 s headway, piston-effect pushes platform salt-air into the underframe cabinets) accelerates connector oxidation on the DCA2000A‘s Harting Han header. STM (Société de transport de Montréal) depot practice: every C2 overhaul (every 3 years), unplug the DCA2000A rack’s Harting headers, DeoxIT, re-plug, torque. If a DCA2000A​ channel drifts >1°C equivalent (bearing temp) between quarterly cal-checks (STM does a portable 4–20 source into the field terminal, compares VCU HMI reading), they swap the module. Tested-surplus 3EST13-151​ units are the usual source since BT→Alstom transition — new lead from Alstom on 3EST13-151 can be 12+ weeks, and a 9-car AZUR out of service for a DCA swap waiting on a courier is ~CAD 80k/day lost capacity.Retrofit / life-extension: BT fleets commissioned 2006–2014 are now hitting 12–18 years. The DCA2000A​ is solid-state with no wear, but the A/D hybrid and the MVB PHY chip can age — sporadic “MVB Slave Com Loss” on one I/O rack every few weeks, clears on re-power, comes back 3 weeks later — classic failing DCA2000A PHY. Depot proactively swaps all DCA modules in a 6-car set during a C3 overhaul (5-year) — 6 × DCA2000A​ + 6 × DCA2000 DI + 6 × DCA2000 DO per train. Because 3EST13-151 is BT-coded, Alstom still supports it but some depots prefer “tested-pull from decommissioned unit + verified” as a cheaper path than new-from-Alstom.