SKC3400400 - Variable speed drive - CONTROL TECHNIQUES

Control Techniques frequency drive SKC3400400 - DIGIDRIVE SK 4 kW

The frequency drive SKC3400400 is part of the DIGIDRIVE SK series from Control Techniques (Leroy-Somer). Designed for reliable control of three-phase induction motors in industrial environments, it targets maintenance teams, system integrators and machine builders seeking precise speed control on a 380-480 V AC supply. Its rated power of 4 kW allows efficient operation for common conveyor, pumping and ventilation applications, while enabling easy integration into space-constrained panels. The compact format, built-in protections and straightforward configuration reduce downtime, improve production consistency and help optimise energy usage by fine adjustment of rotational speed. The DIGIDRIVE SK family is widely used for upgrades and replacements of existing drives, easing operational continuity during unplanned equipment failures or planned retrofit operations.

Technical specifications

• Manufacturer reference : SKC3400400
• Range : DIGIDRIVE SK
• Manufacturer : Control Techniques / Leroy-Somer
• Type : Compact AC variable frequency drive for three-phase induction motors
• Supply voltage : Three-phase 380-480 V AC, 50/60 Hz
• Maximum motor power : 4 kW, approx. 5.4 HP
• Rated input current : 11.9 A
• Rated output current : 9 A
• Output voltage : Three-phase modulated output for driving motors on a 400 V network
• Control mode : Variable frequency control with ramp settings, min and max speeds, motor protection functions
• Parameter interface : User-friendly interface, DIGIDRIVE SK commissioning documentation

Overview of the DIGIDRIVE SK range

The DIGIDRIVE SK series was developed for general-purpose drive applications, focusing on ease of implementation, stable regulation and mechanical compactness. Deployed across a wide range of industries, it provides a robust solution for controlling induction motors in continuous or cyclic processes. The design emphasises clear presentation of essential parameters, consistent protection functions and ease of replacement during corrective maintenance. The hardware and software architecture aim for long-term operation by reducing mechanical stress through controlled acceleration and deceleration profiles, and by allowing speed adjustment to match the actual need, a key factor for notable energy savings on pumps and fans. The range is known for compatibility with heterogeneous automation environments, whether control comes from a programmable controller, a numerical controller or a local operator panel.

• Versatile general-purpose use : reliable speed regulation of induction motors for conveyors, dosing, ventilation, pumping and machine auxiliary drives.
• Range extensions and options : depending on the reference, the DIGIDRIVE SK family accepts configuration and integration options to adapt the drive to the existing architecture.

The SKC3400400 model sits in the 4 kW bracket for 400 V networks, with an output current of 9 A. It includes ramp functions, speed limiting and protections against overcurrents and short circuits to safeguard the motor and installation. For variable-load applications, precise speed adjustment helps reduce losses and maintain stable process quality, while limiting mechanical wear through gradual starts and stops.

Industrial applications

Thanks to its compact design and electrical characteristics, the SKC3400400 integrates easily as a replacement drive on a 400 V three-phase motor or during a panel modernisation. It is well suited to production lines requiring stable, repeatable speed setpoints, whether defined locally or by the existing controller. Frequency regulation allows the drive to match the process demand, reduce mechanical noise and control energy consumption.

• Conveyors and continuous handling : speed regulation for uniform feed, synchronisation via PLC control signals.
• Pumps and ventilation : flow adjustment via speed to limit energy consumption and foaming in liquid processes.
• Packaging : driving rollers, feeding and discharge systems on packaging lines.
• General and auxiliary machines : mixers, light grinders, screw conveyors, workshop equipment with variable needs.
• Integration with NC and automation : control by programmable controller or numerical control to sequence speeds according to recipes.

Integration and communication

The SKC3400400 drive is easily controlled from an existing automation architecture. The DIGIDRIVE SK range supports local commands and standard control signals in industrial environments. Commissioning is carried out via the dedicated user interface, with access to key parameters such as acceleration/deceleration ramps, speed limits, protection thresholds and stop functions. Local diagnostics and clear status displays simplify troubleshooting and maintenance, reducing mean time to repair when servicing a line.

For advanced integrations, option modules are available within the range, to be selected according to the reference and communication requirements. This modular approach facilitates adapting the drive to the site architecture, whether communicating with a programmable controller, being supervised by SCADA or coordinated with other drives. The aim is to ensure functional compatibility without complicating implementation, while maintaining reproducible behaviour from setpoint to shaft speed.

Availability and warranty

The SKC3400400 DIGIDRIVE SK is offered by Standard Exchange Industry as refurbished or exchange units, and can be repaired depending on the condition of your equipment. Each unit is functionally tested and delivered with a warranty. SEI ships within 24 to 72 hours to many destinations to secure your restarts in case of failure. Our technicians assist you in confirming the electrical and mechanical compatibility of this reference with your motor and panel, and in selecting the appropriate options if integration with the automation system is required. This approach reduces the risk of selection errors, limits production downtime and protects the investment over the equipment's lifecycle.