ABB 81EU01E-E Control System PSU | For Automation Applications

Description

Application Scenarios

Inside the main control cabinet of an automated packaging line, dozens of devices—from the central PLC processor and distributed I/O modules to photoelectric sensors and relay coils—require clean, stable 24V DC power to function. The ABB 81EU01E-E​ is mounted on the cabinet’s DIN rail, acting as the central nervous system’s “heart.” It takes the raw 120/230V AC mains power, filters out electrical noise from the plant floor, and delivers a steady, reliable 24V DC supply. For the system integrator, its compact, rail-mounted design simplifies layout and saves space. For the maintenance technician, the clear LED power indicator provides instant status, and its robust design means it can handle the inrush current from multiple solenoid valves activating simultaneously without dropping out. The 81EU01E-E​ provides the essential, worry-free power foundation upon which the entire automation system’s reliability is built.

Key Parameters

Technical Principles and Innovative Values

The ABB 81EU01E-E​ is engineered for robustness and simplicity, providing a dependable power conversion foundation in the electrically challenging industrial environment.

Innovation Point 1: Wide-Range Input with High Immunity for Global and Unstable Grids.​ The module is designed with a wide-range input voltage (e.g., 85-264V AC). This allows the same power supply to be deployed globally without modification and, more importantly, provides exceptional resilience against voltage sags, brownouts, and fluctuations common in industrial settings. It ensures that the control system remains operational during brief grid disturbances that would cause less robust power supplies to reset, preventing costly process upsets.

Innovation Point 2: Stable, Low-Ripple Output for Sensitive Electronics.​ Modern PLCs, communication modules, and analog sensors require exceptionally clean DC power. The 81EU01E-E​ utilizes quality filtering and regulation circuitry to provide a stable output with low ripple and noise. This minimizes the risk of electromagnetic interference (EMI) causing communication errors, data corruption, or erratic behavior in sensitive control electronics, which is a fundamental requirement for system stability.

Innovation Point 3: Robust Protections and Maintenance-Friendly Design.​ It incorporates comprehensive built-in protections. The overload and short-circuit protection is typically hiccup-mode, allowing the unit to automatically recover once the fault is cleared. The DIN-rail mounting and clear screw terminal block design make installation and wiring straightforward, saving panel build time. Its fanless design eliminates a common point of failure, ensuring silent operation and long-term reliability with minimal maintenance.

Application Cases and Industry Value

Case Study: Stabilizing a Sensitive Measurement System in a Food & Beverage Plant

A dairy plant automated its batching process using a new PLC and Coriolis mass flow meters. Intermittent measurement errors and sporadic PLC communication faults plagued the system. After extensive troubleshooting, the root cause was traced to a low-cost, generic 24V DC power supply. It was susceptible to plant voltage dips and introduced significant electrical noise onto the DC bus, affecting the sensitive meters and controller.

The plant engineer replaced it with an ABB 81EU01E-E​ power supply. The wide input range handled the plant’s voltage variations seamlessly. The clean, stable output eliminated the noise on the 24V DC line. Immediately, the measurement errors ceased, and communication became rock-solid. The production manager noted that the costly reprocessing batches due to batching inaccuracies stopped entirely. The reliability of the automation system was no longer a daily concern, directly linking the choice of a robust, industrial-grade power supply to improved product quality and operational uptime.

Related Product Combination Solutions

The 81EU01E-E​ is a key component in building a reliable control panel power distribution system:

Circuit Breaker or Fuse (e.g., ABB S200 series):​ A protective device sized for the 81EU01E-E’s input current must be installed upstream on the AC line for safety and overcurrent protection.

DC System Power Rail / Distribution Block:​ A terminal block or fused distribution block that takes the 24V DC output from the 81EU01E-E​ and distributes it via individual fuses to different cabinet loads (PLC, I/O, sensors).

Redundant Power Supply Module:​ For critical applications, a second 81EU01E-E​ (or similar) can be configured with a redundancy module to provide hot-standby power, ensuring zero interruption.

PLC & I/O System (e.g., ABB AC500. S500/S800 I/O):​ The primary loads powered by the 81EU01E-E. It provides the clean logic power required for their operation.

24V DC Relays and Solenoid Valves:​ The inductive loads that the power supply must be able to handle, including their inrush currents.

Surge Protection Device (SPD):​ Installed on the AC input side to protect the 81EU01E-E​ and downstream electronics from voltage spikes caused by lightning or switching transients.

Installation, Maintenance, and Full-Cycle Support

Installation is straightforward. After mounting on a DIN rail, the AC line (L, N, PE) is connected to the input terminals, and the DC output (+, -) is wired to the distribution system. Critical steps include ensuring correct wire sizing, proper grounding of the protective earth (PE) terminal, and installing the correct input fuse or circuit breaker as specified in the manual.

Maintenance is minimal due to the solid-state, fanless design. Primary tasks involve keeping the unit free of excessive dust and periodically checking that the LED indicator is on. In the event of a fault, the unit’s protections will typically shut down the output. Troubleshooting involves checking input voltage, output for short circuits, and ensuring the load does not exceed the rated current. We provide full support for the 81EU01E-E, from initial selection and sizing based on your load requirements to supplying guaranteed authentic units. Our team can assist with designing redundant power systems and ensuring compliance with your panel standards.

Build your control system on a foundation of reliable power. Contact us for the ABB 81EU01E-E power supply and our expert technical support.