ABB Y129740-002 24VDC Power Supply – Compatible with System 800xA, Advant OCS & AC 800M Racks

Description

Application Scenarios

At a European steel mill modernizing its rolling mill drive control system, engineers installed multiple ABB Y129740-002 power supplies to feed S800 I/O racks managing analog setpoints to high-power inverters. During a grid voltage sag caused by an arc furnace startup, the plant’s main 480 V system dipped to 85% nominal for 300 ms. Thanks to the Y129740-002’s wide input range (85–264 V AC) and hold-up time design, the 24 V output remained stable—preventing a catastrophic shutdown of the mill. Simultaneously, its dry contact alarm relay triggered a warning in System 800xA, allowing operators to log the event without process interruption. This resilience prevented an estimated €180.000 in lost production and reinforced the Y129740-002 as a cornerstone of reliable automation infrastructure.

Parameter

Technical Principles and Innovative Values

Innovation Point 1: True Universal Input with High Immunity

The Y129740-002 operates seamlessly on global mains voltages—from 100 V in Japan to 240 V in Europe—without manual switches. Its switch-mode design includes active power factor correction (PFC) and meets IEC 61000-4-4/5 immunity levels for industrial sites.

Innovation Point 2: Built-In Diagnostic Relay for System Awareness

Unlike generic PSUs, the Y129740-002 provides a potential-free alarm contact that integrates directly into PLC or DCS logic—enabling automatic alerts for low-voltage conditions, fanless thermal faults, or output failure.

Innovation Point 3: Designed for Redundancy & Hot-Swap

When used in pairs with diode decoupling modules (e.g., ABB Y129741-001), the Y129740-002 supports N+1 redundant power architectures, allowing maintenance or replacement without powering down critical I/O racks.

Innovation Point 4: Long-Term Reliability Through Derating

ABB designs the Y129740-002 with conservative component derating and high-quality electrolytic capacitors rated for >100.000 hours MTBF—ensuring decades of service in continuous-operation plants.

Application Cases and Industry Value

Hydroelectric Power Plant (Canada):

Used to power REF615 relays and S800 I/O in remote generator control panels, the Y129740-002’s wide temperature tolerance (-25°C winter start-ups) and surge immunity ensured zero power-related outages over 5 years.

Pharmaceutical Facility (Switzerland):

In a GMP-compliant cleanroom, the fanless, low-EMI design of the Y129740-002 prevented particulate generation and interference with sensitive analytical instruments—critical for FDA audit compliance.

Mining Conveyor System (Chile):

Installed in dust-filled control cabins at 3.000m altitude, the convection-cooled Y129740-002 maintained stable output where fan-cooled competitors failed due to clogging—reducing unplanned downtime by 35%.

Related Product Combination Solutions

ABB Y129741-001: Diode redundancy module for N+1 power supply configurations.

ABB TK811 / TK821: S800 I/O baseplates powered by Y129740-002.

ABB AC 800M PM864A: Controller requiring stable 24 V for CPU and communication modules.

ABB TB801 Terminal Block: For secure field wiring of power distribution from Y129740-002.

ABB System 800xA: Monitors PSU alarm contacts via digital input modules for centralized diagnostics.

ABB DSAO120 / DSAI120 / KSD211B: I/O modules commonly powered by this PSU in real-world deployments.

ABB NSD600: Network diagnostics tool that can correlate power events with I/O anomalies.

Installation, Maintenance, and Full-Cycle Support

Installation is straightforward: mount on standard 35 mm DIN rail, connect AC input and 24 V DC output using appropriate gauge wire (min. 1.5 mm² recommended), and wire the alarm contact to a digital input in your control system. Ensure adequate ventilation (≥20 mm clearance on sides) for convection cooling.

Maintenance is minimal—no fans to clean or filters to replace. Periodically verify output voltage and inspect terminals for corrosion. The alarm relay provides early warning of degradation, enabling predictive replacement before failure.

We supply every Y129740-002 as brand-new, factory-sealed, with full traceability and test reports. Units are pre-tested for output stability, ripple (<100 mVpp), and protection functionality. All come with a 36-month warranty and are backed by our team of ex-ABB power systems engineers who provide guidance on redundancy design, heat load calculations, and integration with legacy cabinets.

With inventory hubs in Europe, North America, and Asia, we guarantee rapid global delivery—even for emergency spares during plant turnarounds.

Contact us for a customized power solution—whether you’re commissioning a new AC 800M system, retrofitting an old Advant panel, or hardening your automation infrastructure against grid instability, the ABB Y129740-002 delivers silent, dependable power where it matters most.