SK0.5M - Variable speed drive - LEROY SOMER

Leroy Somer DIGIDRIVE SK0.5M frequency converter, 0.25 kW 230 V

The SK0.5M frequency converter belongs to the DIGIDRIVE SK series from Leroy Somer, designed for precise control of three-phase induction motors in industrial environments. With a 230 V single-phase input and a 230 V three-phase output, it efficiently supplies a 0.25 kW motor (approximately 0.33 ch) while providing stable speed variation. This reference meets the needs of maintenance teams, integrators and machine builders seeking a compact, reliable and quick-to-deploy solution for controlling conveyors, pumps, fans and small machines. Control can be configured in V/f or sensorless vector mode to optimise low-speed torque, acceleration dynamics and speed holding under load. Built-in protections, local keypad interface and I/O for control simplify integration into an automation architecture driven by a programmable logic controller or numerical control.

Technical specifications

• Manufacturer reference : SK0.5M (commercial code frequently associated: SKA1200025)
• Range : DIGIDRIVE SK
• Manufacturer : Leroy Somer
• Type : Compact AC variable speed drive for induction motors
• Supply voltage : 1 x 230 V AC, 50/60 Hz
• Rated motor power : 0.25 kW (0.33 ch)
• Output voltage : 3 x 230 V AC, variable frequency
• Control mode : V/f or sensorless vector depending on configuration
• Inputs and outputs : Logical and analogue I/O for start, stop and speed setpoint
• Operator interface : Integrated keypad with display for local configuration and monitoring
• Built-in protections : Motor overload, overvoltage, undervoltage and drive safety protections
• Mounting : Compact enclosure for wall or cabinet installation

Overview of the DIGIDRIVE SK range

The DIGIDRIVE SK series groups compact frequency drives intended for driving induction motors in general industrial applications. The design prioritises ease of commissioning, reliability in production environments and stable regulation across a wide speed range. Sensorless vector control separates the magnetising current from the active current, improving torque response during transients and stabilising speed when load varies. The range architecture provides hardwired I/O for direct control from a programmable logic controller, a local keypad for adjusting essential parameters and protection functions to safeguard the motor and drive against common electrical faults.

• V/f control : simple and robust setup, suitable for quadratic and linear loads, with quick configuration for standard applications.
• Sensorless vector : improved low-speed torque, enhanced dynamics during acceleration ramps and better speed accuracy.

The SK0.5M positions itself as a 0.25 kW solution for low-power equipment where operational continuity and energy control are required. It is suitable for retrofitting existing installations as well as new projects where cabinet space is limited and commissioning must remain fast and repeatable.

Industrial applications

This frequency drive integrates into many B2B environments where speed control increases productivity, reduces mechanical shock at start-up and enables measurable energy optimisation. Typical sectors include manufacturing, food processing, logistics and technical facilities.

• Conveying and light handling : belt speed adjustment, soft starting, simple section synchronisation.
• Centrifugal pumps : flow regulation, reduction of water hammer, energy-efficient operation.
• Ventilation and air treatment : variable extraction or supply flow to match process needs.
• Small industrial machines : drives for rollers, mixers, auxiliary drives for assembly lines.
• Plant modernisation : replacement of old starters or obsolete 230 V drives with a compact format.

Integration and communication

Integration of the SK0.5M is simplified by its logical and analogue I/O enabling hardwired control from a programmable logic controller or a local control station. The integrated keypad provides direct access to key parameters, the frequency setpoint and drive status. Depending on the range configuration, communication options may be available to exchange data within an automation architecture. Commissioning is carried out via the operator panel and, according to the range practices, can be supported by the manufacturer's software tools to speed up initialisation, parameter set backups and diagnostics. In operation, the drive contributes to process stability under numerical control by offering repeatable speed regulation with no significant drift across the specified range for this power.

The choice between V/f and sensorless vector control allows the drive response to be adapted to process requirements while avoiding the complexity of a servo drive when it is not necessary. This operational flexibility supports quick integration into new or existing architectures, with reduced wiring and intrinsic protection features that limit unplanned downtime.

Availability and warranty

The Leroy Somer DIGIDRIVE SK0.5M is offered as supply, standard exchange or repair by Standard Exchange Industry. Each unit supplied undergoes functional bench testing before shipment. Shipping is ensured within 24 to 72 hours to over 120 countries. Depending on the chosen service, a 6 to 24 month warranty applies. In case of a line stoppage or uncertainty about compatibility, our technicians assist you to validate the reference, confirm power and voltage suitability with your 230 V three-phase motor and specify the recommended control mode. To ensure operational continuity, we can also study equivalents from the DIGIDRIVE SK series when lead time or obsolescence is an issue, while respecting the Variable speed drives category.