SK3201 - Variable speed drive - CONTROL TECHNIQUES

CONTROL TECHNIQUES SK3201 Frequency Drive

The SK3201 frequency drive is part of CONTROL TECHNIQUES' AC drive range, designed for reliable control of asynchronous motors in industrial environments. Built for the everyday needs of maintenance teams, integrators and engineering departments, it supports speed variation, acceleration and deceleration ramps, and motor protection. Its architecture includes two microprocessors, one of which is a DSP responsible for PWM synthesis with an adjustable carrier frequency, ensuring precise dynamic response and stable control across a wide operating range. The SK3201 is suitable for cabinet or panel mounting, connects via dedicated terminals for power, motor and control circuits, and meets the requirements of many general-purpose applications such as conveyors, pumps and fans. This robust technical design aims to ensure service continuity, reproducible settings and reduced downtime during replacement or modernization of existing installations.

Technical specifications

• Manufacturer reference : SK3201
• Range : CONTROL TECHNIQUES industrial AC drives
• Manufacturer : CONTROL TECHNIQUES
• Type : Frequency drive for three-phase asynchronous motors
• Supply voltage : depends on the SK3201 variant; refer to the nameplate and manufacturer documentation
• Rated power : depends on chassis and version; check the markings on the installed product
• Rated output current : to be confirmed on the datasheet for the specific variant
• Output voltage : three-phase synthesized by PWM, with configurable output frequency
• Control mode : speed and torque regulation managed by DSP, configurable acceleration/deceleration ramps
• Switching frequency : adjustable via parameter, adapted to common acoustic and EMC constraints
• Control interfaces : digital and analog inputs, control terminals for local operation or PLC integration

Overview of the CONTROL TECHNIQUES range

CONTROL TECHNIQUES AC drives are widely deployed for plant upgrades and maintenance of industrial processes. The DSP-based design optimizes PWM synthesis and motor flux quality, delivering measured and repeatable dynamic behaviour. Standard features such as soft start, torque hold at low speed, energy optimisation and motor thermal protection meet the demands of continuous production lines. The configuration philosophy prioritises clarity and stability of settings, making commissioning straightforward after interventions. Compatibility with a wide range of three-phase asynchronous motors makes these drives a versatile solution for utilities and special machinery, without unnecessary over-specification.

• Compact drives for general service : conveyors, pumping, ventilation, auxiliary drives where reliable and efficient speed control is a priority
• Drives focused on process dynamics : applications requiring rapid and stable speed and torque changes, with precise setpoint tracking and controlled transient behaviour

The SK3201 positions itself as an AC drive for general applications where ease of integration, consistent behaviour and long-term stability of control parameters are key criteria.

Industrial applications

The SK3201 meets the needs of many industries where drive speed control affects process quality and energy consumption. The flexibility of parameterisation combined with DSP-controlled PWM provides stable speeds and controlled transitions while limiting mechanical stress. Typical use cases include the following.

• Conveyors and material handling lines : precise speed regulation, section synchronization, soft starts that limit mechanical shock
• Pumping and ventilation : flow adjustment via frequency variation, energy optimisation for quadratic loads
• Packaging : stable throughput, quick transitions between production and indexing speeds
• Continuous processes : mixers, extruders, feed systems where speed consistency impacts product quality
• Technical utilities : industrial HVAC, cooling towers, and auxiliary drives for utilities

Integration and communication

The SK3201 connects via terminals for power, motor and control circuits. Digital and analog inputs enable local control or PLC-based operation, with speed setpoints, Start/Stop commands and fault management via contacts. Depending on configuration, communication options may be available for integration into automation architectures. Commissioning is performed via the local interface or the manufacturer's parameterisation tool, importing essential process parameters such as ramps, protection thresholds and rotation direction.

For retrofit or standard exchange operations, following EMC best practices, careful grounding, motor cable shielding and verifying cabinet ventilation contribute to long-term reliability. Saving and restoring parameter sets facilitates reproducible behaviour. The SK3201 thus integrates easily into existing systems, including when used with upstream digital control, process sensors or PLC-driven sequences.

Availability and warranty

Standard Exchange Industry offers the SK3201 as refurbished supply or as a standard exchange, tested on a test bench, and also provides repair of your original drive when appropriate for your fleet. Shipping is ensured within 24 to 72 hours to over 120 countries to minimise equipment downtime. Services are covered by a warranty of 6 to 24 months depending on the chosen service. If you are unsure about suitability for your application, our technical team will assist you to validate the reference, qualify the usage profile and secure recommissioning. The SK3201 is a reliable frequency drive solution for asynchronous motors, with PWM synthesis driven by DSP and features suited to general applications to stabilise production and control energy consumption.