SK3402 - Variable speed drive - CONTROL TECHNIQUES

Control Techniques SK3402 Frequency Drive - Commander SK

The drive model SK3402 is part of the Commander SK series from Control Techniques. This range is designed for precise control of three-phase induction motors in industrial environments where uptime and ease of deployment are priorities. The SK3402 addresses speed variation and torque control needs for motors around 18.5 kW, with a compact architecture optimised for cabinet integration. It is a practical solution for modernising production lines or replacing older variable frequency drives, thanks to a direct configuration interface and a commissioning approach focused on productivity. For maintenance teams and system integrators, it delivers a balanced compromise between control performance, reduced footprint and total cost of ownership, while integrating easily into an automation architecture driven by a programmable logic controller or numerical control.

Technical specifications

• Manufacturer part number : SK3402
• Range : Commander SK
• Manufacturer : Control Techniques
• Type : AC variable frequency drive for three-phase induction motors
• Supply voltage : typically 380-480 V AC, 3 phases, 50/60 Hz
• Recommended motor power : around 18.5 kW, i.e. ≈ 25 HP
• Output voltage : variable three-phase up to input voltage depending on operating point
• Control mode : V/f scalar and open-loop vector control depending on configuration
• Acceptable mains frequency : typically 48 to 65 Hz on the supply side
• Form factor : compact design suitable for cabinet mounting
• Commissioning : simple interface for quick configuration and start-up

Overview of the Commander SK range

The Commander SK series was developed to provide reliable speed and torque control for induction motors, with a reduced footprint and an accessible configuration logic. It targets general applications where a robust and cost-effective variable frequency drive is sufficient, without advanced servo-positioning features. In operation, this range favours straightforward integration with existing equipment and predictable maintenance, key factors for plant availability and cost control.

• General-purpose, versatile approach : the Commander SK philosophy covers common uses from conveying to ventilation, with essential parameters easily accessible and control dynamics suited to standard load profiles.
• Integration-oriented design : compact cabinet footprint, clear terminal layout, progressive start logic and compatibility with common analog and logic controls used in automation.

The SK3402 follows this principle of controlled simplicity. It meets the needs for replacing older AC drives and facilitates phased upgrades of workshops without altering the existing automation architecture. Compared with a servo drive, it targets process kinematics where maintaining speed and robustness during continuous operation are the priorities.

Industrial applications

The SK3402 covers applications where precise speed regulation, torque control and controlled acceleration/deceleration ramps contribute to process reliability and reduce mechanical stress.

• Continuous conveying and handling : drives for conveyor lines, accumulation, distribution and sorting, with fine adjustment of belt speed.
• Industrial pumping : adapting the operating point, soft starting to limit water hammer and contributing to energy efficiency through frequency variation.
• Ventilation and air handling : fan speed adjustment to maintain target flows and pressures, reducing noise and consumption at partial load.
• Machine tools and light processes : auxiliary drives, table feed, coolant pumps where speed consistency is a priority.
• Food industry and packaging : dosing, bagging, labelling lines, speed calibration synchronised with the PLC.

Integration and communication

The SK3402 drive integrates into systems controlled by programmable logic controllers and numerical control via standard logic and analog signals. Depending on the fitted equipment, communication and extension modules can be used to align the topology with the existing architecture. This modular approach allows adapting the level of interfacing to process complexity while retaining the core speed variation functionality. The control strategy in V/f or open-loop vector is selected according to load and torque stability requirements.

Commissioning relies on a clear local interface, with essential parameters accessible to define ramps, frequency range and operating limits. Maintenance tasks are simplified, enabling field teams to quickly diagnose drive statuses and make necessary adjustments during product changes, speed variations or planned shutdowns. When more advanced control is required, integration with the automation system centralises command and supervision in the line HMI.

Availability and warranty

Standard Exchange Industry offers the Control Techniques SK3402 as refurbished units or exchange service, tested on a test bench according to internal qualification procedures. Delivery is provided within short lead times, typically 24 to 72 hours depending on destination and stock. Repair services are also available to minimise equipment downtime and secure production continuity. Each unit supplied undergoes a functional check before shipment and benefits from a contractual warranty. In the event of a line stoppage, our technical team assists you to confirm compatibility with your three-phase induction motor, specify the 380-480 V supply range and validate suitability for a motor around 18.5 kW, i.e. approximately 25 HP. This expertise helps you quickly identify the right solution, whether for a VFD upgrade, emergency replacement or reintegration into an existing PLC-controlled architecture. For any assistance with selection, reference equivalence or parameter optimisation, our B2B support remains available to ensure a reliable restart.