XP Power DNR240PS24-I DIN Rail Power Supply – DNR Series

XP Power DNR240PS24-I: 240W Fanless DIN Rail PSU for Industrial Control Architectures

The DNR240PS24-I is a 240W, 24VDC DIN rail-mount power supply from XP Power’s DNR Series, engineered for continuous-duty operation in industrial control panels, machine automation enclosures, and process instrumentation marshalling cabinets. Its two-stage conversion topology — active PFC front-end followed by an isolated LLC resonant DC-DC stage — delivers a stable, low-ripple 24VDC bus capable of sustaining 10A continuously across an ambient range of −25°C to +70°C without forced-air cooling. For system integrators and OEM panel builders operating under IEC/EN 61010 and UL 508 compliance requirements, the DNR240PS24-I consolidates power quality, protection depth, and thermal management into a 75mm-wide DIN rail footprint.

The unit accepts universal AC input from 85VAC to 264VAC at 47–63Hz, eliminating tap-switching requirements across 110V and 230V grid standards. Active power factor correction holds PF above 0.95 at full load, reducing reactive current demand on facility distribution and simplifying upstream UPS and circuit breaker sizing. Output voltage is field-adjustable from 22VDC to 28VDC via front-panel trimmer, allowing compensation for cable voltage drop in distributed load topologies without external regulation stages.

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Technical Parameters

Hardware Logical Analysis

The DNR240PS24-I implements a two-stage power conversion architecture. The first stage is an active PFC boost converter that rectifies the wide-range AC input and regulates an intermediate ~400VDC bus. This stage maintains input current sinusoidal and in-phase with the supply voltage, achieving PF >0.95 and THD <10% — parameters that matter in multi-PSU panel installations where harmonic loading on shared neutral conductors is a compliance concern under IEC 61000-3-2.

The second stage is an isolated LLC series-resonant DC-DC converter operating at a fixed switching frequency near the resonant tank’s natural frequency. LLC topology achieves zero-voltage switching (ZVS) on the primary MOSFETs and zero-current switching (ZCS) on the secondary rectifiers across the full load range, which directly accounts for the ≥91% efficiency figure and the elimination of forced-air cooling. Heat dissipation is managed through the aluminum housing and PCB copper pours, with thermal derating beginning at 50°C ambient — a linear reduction from 100% load at 50°C to approximately 60% at 70°C.

EMC performance is addressed at the hardware level through a multi-stage input filter (common-mode choke, X-capacitors, Y-capacitors) that attenuates conducted emissions to meet EN 55032 Class B limits. The 3,000VAC input-to-output isolation barrier, implemented via a high-frequency transformer with reinforced insulation, satisfies the creepage and clearance requirements of IEC 62368-1 and UL 60950-1 for industrial environments. Output supervisory logic monitors the 24VDC rail in real time; OVP trips at approximately 28.8VDC, OCP engages at 110–130% of rated current with hiccup-mode restart, and OTP uses an NTC thermistor embedded in the hotspot zone to trigger shutdown before junction temperatures reach critical thresholds.

The parallel-capable output architecture allows two DNR240PS24-I units to share load current when connected through XP Power’s DCR-series redundancy module. The redundancy module provides diode-OR isolation between the two PSU outputs, preventing a failed unit from back-feeding the healthy unit’s output rail — a critical requirement in 1+1 redundant power architectures for safety-instrumented systems.

System Integration Benefits

• Deterministic 24VDC Bus Stability: Output regulation is held within ±1% from no-load to full load, ensuring that PLC analog input modules (e.g., 4–20mA signal conditioning circuits) receive a reference-quality supply rail with no load-transient-induced offset errors.
• Fanless Architecture Eliminates Scheduled Maintenance: No fan bearings, no filter media, no periodic replacement intervals. Mean time between maintenance events is governed by electrolytic capacitor life — rated >500,000 hours MTBF at 25°C — rather than mechanical wear components.
• Universal Input Simplifies Global Panel Standardization: A single DNR240PS24-I BOM line covers 100–120VAC North American grids, 200–240VAC European and Asian grids, and 110VDC battery-backed distribution systems, reducing panel variant proliferation for OEM builders.
• Active PFC Reduces Upstream Infrastructure Cost: PF >0.95 at full load means the apparent power drawn from the supply circuit is within 5% of real power consumed. For a 10-PSU panel, this can reduce the required circuit breaker ampacity by 15–20% compared to non-PFC designs.
• Adjustable Output Compensates Cable Voltage Drop: In distributed I/O architectures where 24VDC field devices are located 50–100m from the panel, the 22–28VDC trim range allows the panel engineer to pre-compensate for resistive drop without adding external DC-DC converters.
• Comprehensive Protection Prevents Cascade Failures: OVP, OCP, OTP, and short-circuit protection with auto-recovery isolate fault conditions at the PSU level, preventing a single load fault from propagating to adjacent 24VDC consumers on the same bus segment.
• 1+1 Redundancy Support Enables High-Availability Architectures: Parallel operation with XP Power DCR redundancy modules allows SIL 2 and SIL 3 power supply architectures per IEC 61511, meeting the availability requirements of safety-instrumented systems in process industries.
• Compact 75mm Width Maximizes DIN Rail Density: In a standard 600mm-wide enclosure with 400mm of usable DIN rail, five DNR240PS24-I units can be mounted side-by-side, delivering 1,200W of 24VDC capacity — sufficient for a fully populated 16-slot S7-300 rack with I/O modules and field device loads.
• IP20 Enclosure Rating Suits Standard Control Panel Environments: Compliant with IEC 60529 IP20, the unit is rated for installation inside sealed or ventilated control enclosures where direct contact with liquids or particulates is prevented by the enclosure itself.

Quality Assurance & Global Logistics

Every DNR240PS24-I unit supplied by siemensplc.com is sourced from verified XP Power distribution channels and arrives in original XP Power factory packaging with the manufacturer’s datasheet, CE declaration of conformity, and UL listing documentation. Batch traceability is maintained through XP Power’s serial number and date code system, allowing full genealogy tracking from factory production lot to end-customer installation.

Pre-shipment inspection at our Xiamen, China facility includes output voltage verification under no-load and full-load conditions, protection function trip-point confirmation (OVP, OCP), and visual inspection of terminal blocks, housing integrity, and label legibility. Units that do not meet specification are quarantined and returned to the supply chain — no exceptions.

Logistics from Xiamen are executed via DHL Express, FedEx International Priority, and UPS Worldwide Express, with typical transit times of 3–5 business days to Europe, 4–6 business days to North America, and 2–4 business days to Southeast Asia. Export documentation — commercial invoice, packing list, and HS code declaration (HS 8504.40) — is prepared to customs standards for smooth clearance in EU, US, and ASEAN markets. All shipments are insured against transit damage. A 12-month warranty from siemensplc.com covers defects in materials and workmanship, with advance replacement available for qualified accounts.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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