SK4201 - Variable speed drive - CONTROL TECHNIQUES

CONTROL TECHNIQUES SK4201 variable speed drive, AC motor control

The SK4201 variable speed drive from CONTROL TECHNIQUES is aimed at maintenance teams, system integrators and engineering departments seeking a reliable solution for controlling induction motors in demanding production lines. This model can be integrated as a retrofit or as a replacement of an existing drive to quickly restore nominal throughput, optimise energy consumption and stabilise speed deviations related to load variations. Designed for the industrial control cabinet, it simplifies recommissioning of installations where operational continuity is critical. Its methodical parameter setup, compatibility with common automation architectures and compact footprint make it a relevant choice to secure your conveying, pumping or ventilation applications without changing the control engineering. The objective is operational and measurable: reproducible speed command, improved torque holding and increased asset availability.

Technical characteristics

• Manufacturer reference : SK4201
• Range : Industrial AC variable speed drives by Control Techniques
• Manufacturer : CONTROL TECHNIQUES
• Type : Compact drive for three-phase induction motors
• Supply voltage : to be confirmed according to the version of the reference, refer to the nameplate
• Rated power : depends on the installed SK4201 configuration, check the associated documentation
• Rated output current : value to be specified according to the exact product code
• Output voltage : variable depending on the configuration for driving the AC motor
• Control mode : AC speed control, V/Hz and advanced options possible depending on the configuration
• Ingress protection : intended for cabinet mounting, level to be confirmed per model

Overview of CONTROL TECHNIQUES AC drives offering

CONTROL TECHNIQUES develops frequency converters intended for precise control of induction motors in industrial environments. The offering covers general needs for speed variation, soft starting and energy optimisation, with particular focus on ease of commissioning, regulation stability and compatibility with existing automation architectures. The compact format of the units makes replacing an installed device easier, minimises mechanical and electrical adaptations, and reduces downtime during the intervention. Local interfaces are designed to guide the technician through critical steps, from motor identification to setting ramps and thermal protections. This product philosophy aims to ensure reproducible motor behaviour, a consistent response to load transients and a torque quality adapted to process requirements, while remaining aligned with workshop safety and maintenance constraints.

Industrial applications

The SK4201 frequency drive is suited to cross-industry applications where speed control is decisive for quality and throughput. Typical examples: assembly and sorting conveyors, workshop ventilation, process extractors and blowers, centrifugal pumps for utilities, mixers and dosing equipment in food processing, simple winder drives, light handling and auxiliary machine stations. In these contexts, using an AC drive allows fine tuning of the operating point, reduces mechanical shocks, limits consumption at partial load and extends the life of rotating components. Integration with a programmable logic controller is done via I/O and, depending on options, via industry-standard fieldbus.

Integration and communication

Integration of the SK4201 relies on standard control terminals for setpoint selection and management of start, stop and fault states. Depending on the version and available option cards, communication over a market fieldbus can be implemented to exchange setpoints and diagnostics with the PLC. This approach supports centralized supervision, alarm reporting and remote adjustment of key parameters. Commissioning follows a structured process, aligning drive parameters with the motor nameplate, then defining ramps, protection levels and alarm thresholds. This methodology reduces configuration risk and eases reproducibility from site to site. Best practices include documenting the chosen parameter set, validating electromagnetic compatibility in the cabinet and checking cooling for both drive and motor.

Operation, maintenance and operational benefits

In operation, fitting a variable speed drive to an induction motor delivers several tangible benefits. The ability to adjust the speed setpoint according to process demand reduces electrical consumption, especially on pumps and fans where affinity laws highlight significant partial-load gains. Smooth ramp regulation reduces mechanical stress, preserves couplings and limits vibration. Internal status monitoring helps early detection of anomalies, facilitating preventive actions. For maintenance, a like-for-like replacement of a referenced SK4201 secures compatibility and limits requalification of sequences. In planned migrations, the control architecture can be kept while standardising baseline parameters. The aim is to stabilise MTBF and shorten MTTR during interventions, with clear traceability of applied settings.

Availability and warranty

This CONTROL TECHNIQUES SK4201 frequency drive is offered by Standard Exchange Industry new, as an exchange unit or repaired, depending on the condition of your fleet and operational urgency. Each supplied unit is tested on a test bench. International logistics allow shipping within 24 to 72 hours to over 120 countries. Our services are covered by a warranty of 6 to 24 months depending on the selected service. Our technical team assists you to validate the exact reference, power rating, supply voltage and options required for your PLC architecture to ensure a reliable and durable recommissioning.