SKC3400220 - Variable speed drive - CONTROL TECHNIQUES

Control Techniques SKC3400220 variable frequency drive, DIGIDRIVE SK

The variable frequency drive SKC3400220 belongs to the DIGIDRIVE SK range from Control Techniques, designed for driving three-phase asynchronous motors in industrial environments. Sized for a 400 V three-phase supply and a motor power of 2.2 kW (approximately 3 HP), it meets needs for speed variation, controlled starts and energy optimisation on production lines. The integration of an DBR for braking resistor and a C3 EMC filter simplifies EMC compliance and enhances process stability. Control is based on a DSP and a PWM with adjustable carrier frequency, ensuring precise torque and speed regulation without unnecessary complexity. Designed to minimise downtime, this model is commissioned quickly via the local keypad and the manufacturer’s configuration tools. It is aimed at maintenance managers, automation engineers and integrators seeking a robust solution for conveyors, pumps and ventilation systems, with proven compatibility with standard asynchronous motors.

Technical specifications

• Manufacturer reference : SKC3400220
• Range : DIGIDRIVE SK
• Manufacturer : Control Techniques
• Type : AC variable speed drive for three-phase asynchronous motor
• Supply voltage : 400 V three-phase, 50/60 Hz
• Rated power : 2.2 kW, approximately 3 HP
• Control : Open-loop vector control
• Modulation : PWM with adjustable carrier frequency
• Braking : Integrated DBR for connection of a braking resistor
• EMC : Integrated C3 EMC filter for electromagnetic compatibility
• Motor output : Three-phase voltage derived from IGBT bridges, suited to 400 V motors
• Commissioning : Configuration via local keypad or Control Techniques tools
• Cooling : Automatic fan control depending on model configuration

Overview of the DIGIDRIVE SK range

The DIGIDRIVE SK series groups compact drives intended for common industrial applications involving asynchronous motors. Power electronics combined with a dedicated DSP provide stable control across a wide speed range, with consistent response to load variations. The adjustable PWM switching frequency allows tuning the trade-off between acoustic noise and switching losses, which eases integration in noise-sensitive workshops while controlling heating. The inclusion, depending on reference, of built-in elements such as DBR and EMC filter reduces the number of components to install in the cabinet, simplifying wiring and shortening commissioning time. The parameter ergonomics focus on quick field intervention, with direct access to essential motor parameters and acceleration ramps to secure restart after maintenance.

• References with integrated functions : Include C3 EMC filter and DBR to minimise additional hardware and speed up installation.
• General application references : Intended for standard environments, for conveying, pumping and ventilation, with a simplified parameter base.

The range philosophy is to offer a single platform capable of covering essential frequency conversion needs while remaining compatible with varied automation architectures. It positions itself as a sensible alternative to the servo drive when a three-phase induction motor is sufficient, and can coexist with a digital controller or a programmable logic controller using discrete I/O.

Industrial applications

This Control Techniques drive integrates into many industrial environments where reliability and continuity of service are priorities. Speed regulation and direction control allow fine process adjustment, while ramps limit inrush currents and mechanical stress. Energy savings are particularly noticeable on pumps and fans due to frequency adaptation to actual demand.

• Conveying and logistics : Control of belts, rollers and transfers, managing accelerations to reduce mechanical wear.
• Pumping and HVAC : Speed adjustment to maintain target flow or pressure, reducing energy consumption.
• Industrial ventilation : Adapting fan speed to demand, reducing noise and start/stop cycles.
• Assembly machines and small production lines : Simple and reliable speed variation for light machining or assembly stations.
• Food processing and packaging : Basic synchronization of drive sections with direction control and speed adjustment.

Integration and communication

The SKC3400220 integrates easily into existing automation architectures, whether centralized or distributed. The control terminal block supports common control and safety signals, and the local interface provides access to key parameters, including motor ID, minimum and maximum speeds, and acceleration/deceleration ramps. Depending on model configuration, optional modules can extend connectivity for integration on common industrial fieldbuses, enabling drive control and supervision from a PLC.

Commissioning is carried out via the built-in keypad or using configuration tools supplied by Control Techniques, with task-oriented navigation. This approach reduces setup time, simplifies troubleshooting and minimises configuration errors. Vector control, combined with adjustable PWM, ensures a stable response to load disturbances, resulting in maintained speed and improved process quality.

Availability and warranty

The Control Techniques SKC3400220 drive is available new or refurbished depending on availability, tested on a bench and verified under load. Standard Exchange Industry offers shipping within 24 to 72 hours to many countries, with a warranty of 6 to 24 months depending on the selected service. In case of a production stoppage, our technical team supports you to confirm application compatibility, set up essential parameters and identify possible alternatives within the same series. This approach aims to restore production within controlled timelines while ensuring traceability of interventions and reliability of the returned equipment.