SK1T - Variable speed drive - LEROY SOMER

Leroy Somer frequency inverter SK1T – DIGIDRIVE SK

The reference frequency inverter SK1T is part of the DIGIDRIVE SK series from Leroy Somer. Designed to supply and control three-phase asynchronous motors, this model meets speed variation needs on production lines, process equipment and industrial utilities. The SK1T operates on three-phase 380-480 V supply and delivers a rated power of 0.37 kW with a nominal output current of 1.3 A and an input current of 1.7 A. Its sensorless flux vector control provides effective torque and speed regulation without sensors, limiting inrush current and promoting energy savings. The unit includes electronic protection functions, a keypad with display for quick adjustment of essential parameters and a compact design that eases panel integration. This combination makes it a reliable solution for maintenance teams seeking to secure service continuity while controlling operating costs.

Technical specifications

• Manufacturer reference : SK1T
• Range : DIGIDRIVE SK
• Manufacturer : Leroy Somer
• Type : AC variable speed drive for three-phase asynchronous motor
• Supply voltage : three-phase 380-480 V
• Rated power : 0.37 kW (approx. 0.5 HP)
• Input current : 1.7 A
• Nominal output current : 1.3 A
• Output voltage : variable three-phase, limited by supply voltage
• Control mode : Sensorless flux vector control
• Built-in protections : overload, overcurrent, overvoltage, undervoltage

Overview of the DIGIDRIVE SK range

The DIGIDRIVE SK series comprises compact frequency drives dedicated to common industrial applications. Designed for easy commissioning, the range features streamlined parameterisation via local keypad and display, fast panel integration and compatibility with different supply topologies within the product family. Depending on the model, available supplies cover single-phase 200-240 V inputs as well as three-phase 200-240 V and 380-480 V inputs, allowing standardisation across a multi-power fleet.

• Sensorless vector control : torque and speed regulation without sensors, suitable for induction motors over a wide speed range.
• Compact and versatile architecture : easy cabinet mounting, integrated basic functions, scalability within the range according to application requirements.

The SK1T model follows this standardisation approach, addressing the 0.37 kW needs on three-phase 380-480 V networks. Thanks to its sensorless vector control, it maintains stable dynamics at low speed, useful for conveyors, pump drives and fans where setpoint accuracy and energy control are priorities.

Industrial applications

This frequency inverter integrates into environments where service continuity and cycle repeatability are essential. Its ability to limit inrush current, stabilise torque and precisely adapt motor speed meets the requirements of site utilities as well as production machines. Energy savings are significant on affinity-law loads, while reducing mechanical stress at start-up decreases wear on components.

• Centrifugal pumps : flow and pressure regulation, reduction of water hammer with appropriate acceleration and deceleration ramps.
• Ventilation and air handling : fine adjustment of fan speed to optimise airflow and reduce consumption.
• Conveyors : control of linear speed, simple section-to-section synchronisation, soft start to preserve mechanisms.
• Assembly and packaging machines : cadence adjustment, speed stability during loading phases.
• Light material handling : roller drives, lifts and small mechanisms requiring reliable, repeatable variation.

Integration and communication

Integration of the SK1T is simplified by a keypad with display allowing clear local configuration of basic functions. Maintenance teams can adjust ramps, speed setpoints and protection thresholds directly on site. The electronic protections against overload, overcurrent, overvoltage and undervoltage contribute to installation and motor safety. Wiring topology remains standard for an AC frequency drive and fits seamlessly into existing cabinets.

Control and supervision can be carried out via the usual control I/Os and, depending on the range configuration, by optional bus modules suited to programmable logic controller and numerical control architectures. In many scenarios, local regulation by speed setpoint and start/stop signals is sufficient to achieve stable process control, while adding communication cards, when required on other DIGIDRIVE SK references, enables coherent integration into the overall system, without resorting to a servo-drive when the demanded dynamics remain moderate.

Availability and warranty

The Leroy Somer SK1T frequency inverter is offered by Standard Exchange Industry as remanufactured supply, exchange or repair. Each unit is bench-tested before shipment. A warranty applies according to the selected service. Shipping is provided within 24 to 72 hours to over 120 countries. Our technical team supports you to confirm compatibility with your three-phase asynchronous motor, define essential parameters and secure recommissioning. This approach reduces downtime, optimises energy consumption on pumps, fans and conveyors, and extends the service life of your drive fleet in line with your maintenance standards.