SK7T - Variable speed drive - LEROY SOMER

Leroy-Somer frequency inverter SK7T - DIGIDRIVE SK

The frequency inverter SK7T is part of the DIGIDRIVE SK series from Leroy-Somer. Designed to control three-phase asynchronous motors in industrial environments, it meets speed and torque regulation needs with sensorless vector control and a V/Hz control law. This architecture targets process stability, energy efficiency and reduced mechanical stress during start-ups and setpoint changes. The DIGIDRIVE SK-7-T is aimed at maintenance teams, integrators and engineering departments seeking a reliable drive that is easy to configure and compatible with a wide range of applications such as pumps, fans, conveyors or process machines. Its positioning within the range allows it to equip medium to high power installations while maintaining quick commissioning and integrated safety features to protect the motor and installation.

Technical specifications

• Manufacturer reference : SK7T
• Range : DIGIDRIVE SK
• Manufacturer : Leroy-Somer
• Type : AC variable speed drive for three-phase asynchronous motor
• Supply voltage : three-phase AC, 50/60 Hz, depending on model and configuration of the series
• Rated power : range up to 132 kW depending on references; exact values for the SK-7-T frame to be confirmed in the manufacturer documentation
• Output voltage : three-phase, adjusted by PWM according to the setpoint and configuration
• Control mode : V/Hz law and sensorless flux vector control, precise regulation of speed and torque
• Switching frequency : adjustable according to application parameters and acoustic constraints, within the limits defined by the series
• Built-in protections : monitoring of overload, overheating, voltage faults and motor-side short-circuit, in accordance with Leroy-Somer documentation
• Control interfaces : local keypad and display, I/O terminal block for PLC control, fieldbus communication options depending on configuration

Overview of the DIGIDRIVE SK range

The DIGIDRIVE SK series groups frequency inverters intended for general industrial and process applications. The range philosophy is to provide stable, energy-efficient regulation, with accessible configuration while retaining the key functions expected by operators and maintenance teams. Commissioning is carried out via guided menus and can be assisted by associated configuration software, which simplifies adaptation to different machines and load profiles. Compatibility with local controls, a programmable logic controller or numerical control allows integration into new or existing control architectures.

• V/Hz mode : voltage/frequency ratio control for standard loads, suitable for pumping and ventilation applications with adapted control laws
• Sensorless vector control : refined speed and torque regulation without encoder feedback, useful for conveyors, feeders and process operations sensitive to variations

The SK7T model follows this range logic and is generally deployed on medium to high power installations within DIGIDRIVE SK. It is suited to energy optimisation needs, reduction of mechanical jolts and continuity of service, with dedicated diagnostics via status and alarm codes that facilitate on-site support.

Industrial applications

This DIGIDRIVE SK frequency inverter integrates into a wide range of industrial environments where control of speed and torque conditions process quality and production availability.

• Pumps and hydraulic circuits : flow adaptation, reduction of water hammer and energy savings through variable load operation
• Ventilation and HVAC : fan speed control for air flow and extraction regulation
• Conveying and material handling : drive control for belts, rollers and sorters with soft starts and smooth speed changes
• Process machinery : speed regulation on assembly lines, packaging, food processing and textile machines
• Integration on CNC and automated equipment : interface with PLC or numerical control for coordinated control

Integration and communication

The SK7T offers local control via keypad and display, an I/O terminal block for standard electrical commands and the option to add communication modules for fieldbus networks depending on the chosen configuration. This flexibility allows connection to existing automation systems while preserving rapid commissioning. Essential parameters, such as acceleration and deceleration ramps or current limits, are adjusted intuitively to match the drive to the actual load.

The DIGIDRIVE SK series includes protections aimed at operational continuity and equipment safety, notably overload detection, thermal monitoring and voltage fault detection. Diagnostic functions assist rapid incident analysis to reduce downtime. Use together with a PLC simplifies supervision, logging of states and integration into the control system. For advanced needs, the configuration software associated with the range facilitates backup and duplication of parameters between machines.

Availability and warranty

The frequency inverter Leroy-Somer SK7T is offered by Standard Exchange Industry as new supply, exchange or repair. Each unit supplied is bench-tested and benefits from a warranty whose duration varies according to the selected service. Shipping is provided within 24 to 72 hours to over 120 countries to meet production line downtime constraints. In the pre-sales phase, our technical teams verify functional and mechanical compatibility with your installation and can assist you in identifying the parameters required for a safe and controlled return to service. For any questions regarding the exact nominal values for the SK-7-T frame, input and output voltage, current, power in kW and HP, please refer to the DIGIDRIVE SK series manufacturer documentation or contact our technical support.