PXA45-1015 ABB Bailey

Product Dimensions：

The PXA45-1015 belongs to the SD Series of power supplies within the ABB portfolio. It acts as a primary power conversion stage, transforming high-voltage AC input into a stabilized $24 \text{ VDC}$ output. A defining feature of this model is its support for Redundancy, allowing two or more units to be connected in parallel through an external diode redundancy module or integrated logic. This ensures that if one power supply fails, the control system continues to operate without interruption. The unit is housed in a rugged, industrial-grade metallic casing designed for DIN rail mounting inside specialized power cabinets.

Product Parameters

• Input Voltage Range: Supports universal AC input, typically ranging from $90 \text{ VAC}$ to $264 \text{ VAC}$, $47-63 \text{ Hz}$.

• Output Voltage: Factory set to $24 \text{ VDC}$, usually adjustable within a small range (e.g., $23-28 \text{ VDC}$) to compensate for voltage drops over long cable runs.

• Rated Output Current: $15 \text{ A}$ (as indicated by the "15" in the part number suffix).

• Efficiency: High-efficiency design, typically exceeding $90\%$, which minimizes internal heat generation.

• Isolation: Provides a high level of galvanic isolation between input and output, often rated at $3 \text{ kVAC}$ or higher.

• Mounting: Standard $35 \text{ mm}$ DIN rail mounting or specialized chassis mounting depending on the cabinet configuration.

• Cooling: Convection cooled; does not require internal fans, which increases the Mean Time Between Failures (MTBF).

• Status Signals: Includes "DC OK" dry contact relay outputs for remote monitoring of the power supply health.

Product Advantages

A major advantage of the PXA45-1015 is its Industrial Hardening. Unlike commercial-grade power supplies, it is built to withstand electrical surges, high ambient temperatures, and vibrations common in heavy industries. The High Reliability of the unit is evidenced by its exceptionally long service life, often exceeding 15 years in continuous operation. Furthermore, the unit features Excellent Load Regulation, ensuring that even when a large number of I/O modules switch simultaneously, the $24 \text{ VDC}$ bus remains stable and free of noise. Its Compact Footprint allows for high-density installation in power distribution panels where space is at a premium.

Important Considerations and Precautions

When installing the PXA45-1015, the most critical precaution is ensuring Proper Ventilation. Although the unit is convection-cooled, it must be mounted with sufficient vertical clearance (typically at least $50 \text{ mm}$) to allow rising heat to escape; failure to do so can lead to thermal derating. Wiring Integrity is also vital; use properly sized conductors for the $15 \text{ A}$ output to avoid excessive heat at the terminal blocks.

Users must ensure that the AC Input Protection (fusing or circuit breakers) is sized according to the unit’s inrush current specifications to prevent nuisance tripping during power-up. Finally, if using the unit in a Redundant Configuration, it is essential to use the correct ABB redundancy modules to ensure load sharing is balanced correctly between the multiple PXA45 units.

Product Applications

The ABB PXA45-1015 is a staple in large-scale infrastructure and energy projects.

• Power Plants: Providing the main system power for turbine control systems and boiler protection logic in coal, gas, and nuclear facilities.

• Oil and Gas Refineries: Powering safety instrumented systems (SIS) and distributed control systems (DCS) in hazardous areas.

• Water and Wastewater: Ensuring continuous operation of PLC racks and communication gateways in treatment facilities.

• Chemical Processing: Powering field instruments and valve positioners that require a highly stable and noise-free $24 \text{ VDC}$ source.

• Pulp and Paper: Supporting the high-density I/O requirements of paper machine control systems.

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