ESMD251X2SFA Lenze SMD-Series 0.25 kW Compact AC Drive

Product Overview

The ESMD251X2SFA (ESMD251X2SFA) is an ultra-compact, high-efficiency AC frequency inverter from the Lenze SMD-series, specifically engineered for basic automation tasks that demand reliability and ease of use. Delivering a rated power of 0.25 kW and a current capacity of 1.6 A, this drive is a standard solution for small-scale B2B applications such as pharmaceutical dosing pumps, packaging conveyors, and laboratory agitators. The ESMD251X2SFA is highly versatile, supporting both 1-phase and 3-phase 230 V input configurations, allowing it to adapt to diverse facility power grids without hardware changes. Although the SMD series reached its phase-out milestone in 2017, this German-manufactured drive remains a preferred choice for maintenance professionals and system integrators who prioritize a "parameter-light" setup and a robust IP20-rated chassis for consistent performance in space-constrained control cabinets.

Technical Configuration

The ESMD251X2SFA architecture is built for simplicity and rapid deployment, featuring a streamlined hardware interface that eliminates the complexity of high-end motion controllers. It provides a standard 3-phase 230 V output with an adjustable frequency range optimized for standard asynchronous motors. The unit is housed in a compact 12.00 x 14.00 x 6.00 cm frame, making it one of the most space-efficient 0.25 kW drives in its class. Internal protection logic includes integrated current limiting, overvoltage monitoring, and short-circuit protection to ensure the safety of both the inverter and the connected motor. Its design focuses on essential I/O requirements, providing digital inputs for start/stop and direction control, along with an analog input for speed setpoints, making it an ideal "drop-in" component for legacy system upgrades.

Technical Specifications

Technical FAQs

What makes the ESMD251X2SFA "1-3 Phase" compatible?

This model is designed with a flexible input bridge. It can be powered by a standard single-phase 230 V residential/commercial line or a three-phase 230 V industrial line. This flexibility is ideal for OEMs building machines for global markets with varying power standards.

Does the SMD series require complex software for commissioning?

No. One of the primary advantages of the ESMD251X2SFA is its simplicity. Most basic applications can be configured directly through the integrated front-facing buttons and LED display, though specialized EPM chips can be used for rapid parameter duplication across multiple units.

Can I use this drive for high-torque startup applications?

The SMD series is optimized for V/f (Voltage/Frequency) control, which is excellent for pumps, fans, and simple conveyors. For applications requiring extremely high torque at near-zero speeds, a vector-controlled drive like the 8200 Vector or 9300 series may be required.

Engineering & Installation Guide

For the ESMD251X2SFA, vertical mounting is required to allow for natural convection cooling; given its compact size, ensure at least 50 mm of free space above and below the unit. To ensure electromagnetic compatibility (EMC), use shielded motor cables and ground the shield at the cabinet backplane using a conductive clamp. If the unit is used in a single-phase 230 V configuration, ensure the input fuse is sized to handle the higher input current compared to 3-phase operation. During setup, utilize the "EPM" (Electronic Programmable Module) if you have multiple drives to configure; this plug-in chip allows you to save the parameter set from one ESMD251X2SFA and "flash" it to others in seconds, significantly reducing commissioning time for production lines.