Bachmann NT255 Power Supply Module
Configured for high-efficiency system powering and voltage stabilization in Bachmann M1 Automation System architectures, the Bachmann NT255, also cataloged as the NT255 Power Supply Module, provides direct physical/electrical execution.
Suffix Breakdown & Model Matrix
| Part Number | Continuous Output Power | Peak Output Power | Operating Temperature Range | Environmental Protection |
|---|---|---|---|---|
| NT255 | 45 W | 55 W | -30 to +60 deg C | Standard Enclosure Protection |
| NT255 CC | 45 W | 55 W | -30 to +60 deg C | ColdClimate Conformal Coating |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | NT255 |
| Brand | Bachmann |
| Origin | Austria / EU |
| Weight | Standard Module Mass |
| Dimensions | M1 System Form Factor |
| Operating Temp | -30 to +60 deg C |
| Power Consumption | Max 68 W Input Power |
| Input Voltage Range | 18 to 34 VDC (Peak +40 V for <1 s/min) |
| Output Voltages / Currents | +5 VDC at 6 A (8 A peak), +15 VDC at 0.5 A, -15 VDC at 0.5 A |
| Continuous / Peak Output Power | 45 W / 55 W |
| Buffer Time (Power-Fail Bypass) | 18 ms (Power-fail signal triggered after 3 ms) |
| Starting Current Limit | Max 8 A after 5 ms |
| Protection Mechanisms | Electronic Reverse Polarity Protection, Internal 7 A SMD Fuse |
| Status Indicators | Status LEDs (Power, Error, Ready) |
| Galvanic Isolation | 500 V (Input/System), 100 V (Input/Ground) |
Backplane Bus Communication Velocity & Determinism
The Bachmann NT255 incorporates planar transformer architecture combined with coolPCB thermal management to supply stable logic rail power directly across the M1 backplane bus. When input voltage dips occur, the integrated power-fail monitoring circuit asserts an early warning signal to the system CPU within 3 ms, allowing the processor to safely preserve volatile data and complete critical backplane bus cycles before the full 18 ms buffer capacity expires. This rapid power-loss notification maintains determinism and firmware flash compatibility across backplane-connected modules during temporary supply disruptions.
Frequently Asked Questions
Q: How does the power-fail signal interact with the system controller during an input power drop?
A: The module continuously monitors input rail levels and generates an early power-fail warning signal to the CPU module precisely 3 ms after an undervoltage condition is detected, providing a predictable window for controlled shutdown routines prior to power bus collapse.
Q: Can the NT255 supply temporary current surges required by high-density system startup loads?
A: Yes, the unit delivers up to 55 W of peak output power and allows the +5 VDC rail to scale up to 8 A peak, absorbing brief inrush currents without tripping protection circuits.
Field Installation Guidelines
Ensure primary supply voltage is disconnected before mounting or removing the module from the M1 system backplane rack. Install the power supply vertically within the chassis enclosure to maximize vertical convection air movement across the coolPCB circuit structure. Route incoming primary supply wiring (18 to 34 VDC) using appropriate gauge wire, taking care to separate DC input lines from sensitive analog or high-frequency communication cables. Securely connect the primary earth terminal to the central cabinet grounding point to guarantee full 100 V input-to-ground isolation and optimum surge dissipation performance.
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