SK4401 - Variable speed drive - CONTROL TECHNIQUES

CONTROL TECHNIQUES SK4401 Frequency Drive – SK Series

The reference frequency drive SK4401 belongs to the SK series from CONTROL TECHNIQUES, a family of drives known for stable regulation, ease of commissioning and reliable integration into production lines. Intended for industrial B2B environments, this model meets the needs of maintenance departments and integrators seeking a fast replacement solution for controlling three-phase induction motors. It is suitable for conveying, pumping, ventilation, dosing, packaging and handling applications where speed and torque control are critical to process quality. Thanks to its modular architecture within the range, the SK4401 adapts to retrofit constraints, ensures compatibility with major automation interfaces, and facilitates return-to-service while minimising downtime. Exact specifications such as input voltage, rated power, control modes and communication options depend on the variant and must be confirmed via the nameplate and associated documentation.

Technical specifications

• Manufacturer reference : SK4401
• Range : SK series
• Manufacturer : CONTROL TECHNIQUES
• Type : Frequency drive for three-phase induction motors
• Supply voltage : depends on configuration, confirm on the nameplate
• Rated power : depends on the version, check the product label
• Output voltage : PWM, corresponding to input voltage and motor sizing
• Control mode : depends on version, V/Hz and/or open-loop vector control, to be confirmed
• Switching frequency : configurable depending on model and thermal conditions
• Ingress protection (IP) : depends on the chassis, check SK series documentation

Overview of the SK series

The SK series from CONTROL TECHNIQUES is deployed across many installations for speed regulation and energy management of motors. It stands out for a streamlined parameter interface, application-oriented function sets and compatibility with existing automation architectures. The modularity of the range allows I/O and communication to be adapted to field requirements while maintaining a consistent programming logic. For corrective maintenance or retrofit, this consistency eases migration from older drives to equivalent references in the series, limiting mechanical and electrical adjustments. The range documentation details available application profiles, control function blocks, and recommended installation practices for enclosures or cabinets. The SK4401 fits this continuity and meets availability, setpoint accuracy and thermal stability requirements, offering reproducible and traceable behaviour, a key point for workshops subject to documented quality standards.

• Speed control : fine adaptation to process setpoints, maintaining stability at low speed depending on configuration
• Protection functions : management of overcurrents, undervoltage and overheating, configurable within the series logic
• Operator interface : local keypad or software tool depending on options, for commissioning and diagnostics
• Automation compatibility : integration with programmable logic controllers and supervision via fieldbus options available on the SK series
• Facilitated maintenance : configurable parameters can be saved, standard exchange possible, traceability of interventions

Industrial applications

The SK4401 frequency drive covers a wide range of industrial applications. On conveying lines it provides precise speed control and soft starting of loads. In pumping and ventilation, it optimises the operating point to reduce energy consumption while limiting mechanical stress on hydraulic components. In packaging, it synchronises rollers and belts to ensure consistent packaging operations. For handling equipment it contributes to precise translation and lifting movements while respecting safety setpoints. It also integrates into processing and dosing processes where speed stability directly affects product quality. The interface with the programmable logic controller and, where applicable, the numerical control enables centralised setpoints and coherent station supervision.

Integration and communication

The SK4401 fits into automation architectures via the standard I/O of the SK series and, depending on installed options, via communication modules. Fieldbuses commonly associated with the series include, depending on variants, protocols such as Modbus RTU, CANopen, PROFIBUS-DP or DeviceNet. The goal is to ensure simple integration with PLCs and existing supervision systems. Commissioning is performed via local operator panel or dedicated software depending on configuration, with access to essential parameters for ramps, limits, protections and state management. The diagnostic logic enables faults and warnings to be reported to the supervision system for targeted maintenance intervention. Electrical parameters, notably input voltage and rated power, must be aligned with the nameplate, motor category and cooling conditions to ensure thermal compliance and long-term reliability. SK series installation best practices specify wiring, shielding, grounding and separation distances in cabinets.

Availability and warranty

The CONTROL TECHNIQUES SK4401 frequency drive is offered by Standard Exchange Industry as refurbished supply or exchange unit, bench-tested according to documented procedures. Shipping is provided within 24-72 hours to many countries to reduce equipment downtime. Repair and exchange services benefit from a warranty whose duration varies depending on the selected service. Our technical team can check the compatibility of the SK4401 with your motor, electrical environment and communication requirements based on your installation data and the nameplate. This approach aims to secure return-to-service, minimise incompatibility risks and maintain production continuity. For any request, please specify the application, motor power, supply voltage and the communication buses present to guide the appropriate configuration within the SK series.