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Bachmann NT255 Power Supply Module

1. Product Overview

2. Core Specifications

3. Key Functions

3.1 Wide-Range Input & Stable Output

• Dual-Input Compatibility: Supports both AC (85–264V) and DC (120–370V) input, making it suitable for diverse industrial power grids—from unstable factory AC supplies to DC-powered rail systems. This flexibility eliminates the need for separate power supplies for different deployment scenarios.
• High-Precision Regulation: Delivers 24V DC with ±1% accuracy and ≤50mVpp ripple/noise, ensuring clean power for sensitive M1 components (e.g., the ME203/N processor module or PTAI216 temperature input module). Stable voltage prevents data corruption in I/O signals or communication errors in network modules.

3.2 Robust Protection Mechanisms

• Multi-Layer Fault Defense:
  • Overload/Short-Circuit Protection: Limits current during overloads or short circuits (e.g., a damaged I/O module causing a short) to prevent damage to the power supply or M1 components, with auto-recovery once the fault is resolved.
  • Overvoltage Protection: Latches shutdown if output voltage exceeds 28–32V DC (e.g., due to a failed regulator), protecting downstream modules from voltage spikes that could fry electronics.
  • Over-Temperature Protection: Shuts down temporarily if the module overheats (e.g., in a poorly ventilated cabinet), resuming operation once cooled to prevent thermal damage.

3.3 M1 System Optimization

• Rack-Integrated Design: The 35mm-wide form factor fits seamlessly into the M1 rack, sharing the same DIN rail mounting as other M1 modules. It powers the entire rack via the M1 backplane, eliminating the need for external wiring to individual modules—simplifying installation and reducing cable clutter.
• Peak Current Support: 12A peak current (for 10s) accommodates high-startup loads from M1 modules (e.g., when multiple I/O modules power on simultaneously), preventing voltage dips that could cause module initialization failures.

3.4 Industrial-Grade Durability

• Wide Temperature & Vibration Tolerance: Operates reliably at -25°C ~ +70°C and withstands 2g vibration—suitable for harsh environments like unheated factory floors, outdoor rail cabinets, or process plants with mechanical vibration.
• EMC Immunity: Complies with IEC 61000-6-2 industrial EMC standards, resisting interference from nearby motors, inverters, or high-voltage cables. This ensures stable power output even in electrically noisy environments.

4. Typical Applications

• Factory Automation M1 Racks: Powers an M1 system with 8–10 modules (e.g., ME203/N processor, DIO248 I/O, CS200/N CANopen) in an automotive assembly line—wide AC input handles factory power fluctuations, and overload protection safeguards against shorted I/O modules.
• Rail Auxiliary Control: Supplies power to an M1-based HVAC/lighting control system in a rail vehicle—DC input compatibility (120–370V DC) matches rail vehicle power systems, and EN 50155 compliance ensures durability in rail environments.
• Process Monitoring Systems: Powers an M1 rack with PTAI216 temperature modules and RS204 communication modules in a chemical plant—stable 24V DC output ensures accurate temperature readings, and over-temperature protection handles heat from nearby process equipment.
• Remote Sensor Nodes: Powers a compact M1 system (1 CPU + 2 I/O modules) in a remote water treatment pump station—wide input range accommodates unstable grid power, and auto-recovery protection minimizes downtime from temporary faults.

5. Usage Notes

1. Input Wiring Guidelines:
   • For AC input: Use 1.5mm² copper wires (rated for 85–264V AC) and connect to a dedicated circuit breaker (10A recommended) to prevent overcurrent in the input line.
   • For DC input: Ensure polarity is correct (positive to "+DC IN", negative to "-DC IN")—reverse polarity will trigger overvoltage protection and latch the module into shutdown (requires power cycling to reset).
   • Use shielded input cables in high-EMI environments (e.g., near welding equipment) and ground the shield at the input source end to reduce interference.
2. Load Management:
   • Calculate total load current before installation: Ensure the sum of M1 module currents does not exceed 10A (continuous) or 12A (peak). For example, 5 modules drawing 2A each (total 10A) are safe, but 6 modules drawing 2A each (total 12A) require a second NT255 or a higher-rated power supply.
   • Avoid daisy-chaining external loads (e.g., sensors, actuators) to the NT255—use dedicated auxiliary power supplies for external devices to prevent overloading the M1 backplane.
3. Installation & Ventilation:
   • Mount the NT255 in the M1 rack with ≥20mm clearance above and below to ensure airflow—overheating is common in tightly packed cabinets, especially at high ambient temperatures (+60°C~+70°C).
   • For rail or outdoor applications, use an IP54+ enclosure to protect the module from dust and moisture (IP20 only protects against finger contact, not environmental debris).
4. Troubleshooting:
   • If the module fails to output power: Check if the overvoltage protection is latched (power cycle the input to reset). If the issue persists, verify input voltage (must be within 85–264V AC/120–370V DC) and test for short circuits in the M1 backplane (disconnect modules one by one to isolate the fault).
   • If output voltage is unstable: Check for loose input connections or excessive load current (use a multimeter to measure load current). High ripple/noise may indicate a faulty capacitor—replace the module if ripple exceeds 50mVpp.
5. Maintenance:
   • Perform quarterly visual inspections: Check for loose wires, terminal corrosion, or signs of overheating (discolored plastic). Clean the module’s vents with compressed air (low pressure, <2 bar) to remove dust buildup, which can block airflow and cause overheating.
   • Replace the module every 5–7 years (or as per Bachmann’s recommended service life) to avoid unexpected failures—capacitors and other components degrade over time, reducing output stability and protection effectiveness

The structure and details of the product：

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