SK1,5T - Variable speed drive - LEROY SOMER

Leroy Somer SK1,5T VFD - DIGIDRIVE SK

The SK1,5T frequency converter belongs to the DIGIDRIVE SK family from manufacturer Leroy Somer. Designed to drive three-phase asynchronous motors with a rated power of 0.75 kW (approximately 1 HP), it meets speed variation and torque control needs across a wide range of industrial applications. Its sensorless flux vector control topology allows precise low-speed response while optimising energy consumption. Thanks to its compact format, integrated protection functions and programmable acceleration and deceleration ramps, the DIGIDRIVE SK eases panel integration and reduces downtime during replacement or retrofit operations. The SK1,5T is aimed at maintenance teams, integrators and automation engineers seeking a reliable, quick-to-configure solution compatible with control architectures driven by a programmable logic controller or numerical control.

Technical specifications

• Manufacturer reference : SK1,5T (associated code SKB3400075)
• Range : DIGIDRIVE SK
• Manufacturer : Leroy Somer
• Type : AC frequency converter for three-phase asynchronous motor
• Supply voltage : 380 to 480 V AC three-phase
• Rated motor power : 0.75 kW, approximately 1 HP
• Rated input current : 3.1 A
• Rated output current : 2.1 A
• Control mode : Sensorless flux vector control
• Built-in functions : Configurable acceleration and deceleration ramps, overload, overcurrent and overvoltage protections, energy optimisation

Overview of the DIGIDRIVE SK range

The DIGIDRIVE SK series groups compact AC variable frequency drives designed for common industrial drive needs. Their architecture focuses on ease of commissioning, functional robustness and consistency of key motor control parameters. The goal is to provide a reliable solution for speed variation, soft starting and torque adjustment on new or existing production machines, with a reduced cabinet footprint and straightforward parameterisation.

• Speed variation and energy efficiency : Fine adjustment of motor speed to limit excess consumption and improve overall installation efficiency, particularly on variable torque loads.
• Vector control : Stable torque regulation at low speed without a speed sensor, useful when process quality requires constant speeds despite load fluctuations.

The SK1,5T model targets 0.75 kW drives in general applications where precision, repeatability and speed stability are priorities. It offers a relevant balance between fine tuning, ease of installation and controlled operating costs. In modernization or replacement contexts, its footprint and parameter-based approach facilitate return to service with minimal mechanical and electrical adaptations.

Industrial applications

This Leroy Somer frequency converter integrates into a wide variety of environments. Its vector control, configurable ramps and integrated protection devices support continuous operation in production areas subject to frequent starts, load variations or controlled cycle requirements.

• Conveyors and light handling : Precise speed adjustment to synchronise feed and limit mechanical jolts.
• Water and industrial fluid pumping : Control adapted to variable-torque load profiles, reduction of hydraulic transients thanks to ramps.
• Ventilation and air handling : Flow adjustment according to process needs, contributing to energy efficiency.
• Packaging and wrapping machines : Control of linear speeds and cycle times on infeed heads and drive rollers.
• Food processing and light mixers : Speed stabilization for recipe consistency and production quality.
• Textile and light processing : Maintain torque at low speed for operations sensitive to slippage.

Integration and communication

The DIGIDRIVE SK is designed for direct installation in control cabinets. Configuration is performed via the keypad or using configuration tools depending on available options. This approach enables methodical commissioning, with quick identification of fundamental motor parameters and acceleration ramps adapted to the process. The standard I/O schemes of the range allow local or remote control of the drive. Integration with a programmable logic controller is achieved according to the existing automation architecture, and the drive also fits into cells under numerical control when a stable speed variation is required for auxiliary axes. When applications require broader data exchange, communication modules are available within the family to support chosen industrial topologies, without presuming a specific protocol. Note that this model targets asynchronous motor control and is not a substitute for a servo drive dedicated to synchronous servomotors.

In daily operation, maintenance teams value clear status and fault readouts, the presence of internal protections and the consistency of parameter sets. The aim is to reduce mean time to repair and to return the machine to production quickly after intervention. In operation, speed stability and low-speed torque retention contribute to process repeatability and product quality.

Availability and warranty

The Leroy Somer SK1,5T frequency converter is offered as a refurbished unit or as an exchange unit depending on availability, tested on bench and supplied with warranty. Standard Exchange Industry ships within 24 to 72 hours to over 120 countries, and assists technical teams in identifying the exact reference and equivalence conditions during replacement. In case of a line stoppage, our support analyses the application, checks electrical compatibility, confirms the targeted power of 0.75 kW and validates key parameter points, notably the 380 to 480 V AC supply, the sensorless vector control and the protections to enable. This procedure aims to secure return to service and to make the installation reliable over time, without imposing costly control modifications on the site PLC.