Control Techniques

Variable speed drives, AC drives, DC drives & repairs

As an official Integration Partner for Control Techniques drives, Northern Industrial has a large inventory of current and obsolete CT drives in stock. So whether you are looking for a expansion module for a Unidrive Classic, advice on replacing a Digitax drive or require an urgent repair to a Commander CD, we can help.


About Control Techniques

Northern Industrial has always had a close relationship with Control Techniques and in 2012 was named the first official integration partner in the UK. We are therefore able to offer expert technical support for the entire Control Techniques range of inverters, DC drives and servo drives.

Originally founded in 1973 under the name of KTK, the company initially specialised in DC Drives. We’ve actually got a few of these drives in stock. In 1985, KTK became Control Techniques and soon moved into AC Drive technology. 10 years later Control Techniques launched the Unidrive classic which was one of the first general purpose inverters. The drives were so popular that we still get asked for them today. It was during this period that Control Techniques was purchased by Emerson, a large multinational from the United States. The company now operate 45 drive centres around the world and has an impressive portfolio of HVAC drives, DC drives, inverters and servo drives.

Current products

  • Unidrive M200

    Unidrive M200

    The Unidrive M200 is from Control Techniques latest family of AC drives, the Unidrive M. Designed as the direct replacement for the popular Commander SK range, the M200 is suitable for numerous applications including fans, pumps, conveyors and mixers.

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  • Unidrive M700

    Unidrive M700

    Also part of the Unidrive M family is the Unidrive M700 which provides class-leading motor control for induction, permanent magnet and servo applications. The high performance motor control and increased flexibility satisfy the requirements of machine builders and high specification industrial applications.

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  • Mentor MP

    Mentor MP

    Select the Mentor MP for a flexible DC drive available in two or four quadrant operation. Like the Unidrive SP the drive has integrated PLC functionality and you can select a range of options thanks to the three available option module slots. Looking to upgrade your Mentor II? Mentor MP is the direct replacement.

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  • Digitax ST

    Digitax ST

    Digitax ST servo drives provide a complete solution for all your servo requirements. This Control Techniques drive series comes in several models and is optimised for pulse duty servo applications that require high peak torque, ease of use, flexible integration features and dynamic response.

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  • Maestro


    When first released the Maestro range of DC brushed servo drives were manufactured to the latest surface mount specifications ensuring quality, reliability and above all a cost-effective solution to low power DC servo applications. The Maestro series comes in three sizes - Mini, Midi and Maxi.

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Legacy products

  • Commander SK

    Commander SK

    Control Techniques Commander SK is the perfect AC inverter drive for simple applications up to 7.5kW. The SK offers great value for money and is extremely easy to set up thanks to the preloaded parameters. Built in keypad and filter means you are ready to go as soon as the drive is delivered.

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  • Unidrive SP

    Unidrive SP

    The Unidrive SP is an ideal AC drive for complex applications. This inverter is available from 0.37kW to 132kW and is easy to set up, has onboard PLC capabilities and can be configured to a wide range of applications with the expandable options and communication protocols.

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  • Digitax DBE

    Digitax DBE Servo drives

    The Digitax is now an obsolete servo drive manufactured by Control Techniques. They originally came in eight different models that covered a power range of 1.4kW to 22kW making them suitable for a range of applications. We can provide you with reconditioned Digitax servo drives, repairs and upgrades.

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  • Mentor II

    Mentor II

    Mentor II is a microprocessor based digital DC drive that comes in a power range of 5.5kW to 750kW. These 3 phase DC motor speed controllers come in both regenerative and non-regenerative models and have extensive fieldbus communication capabilities.

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  • Unidrive Classic

    Unidrive Classic

    The Unidrive Classic is now obsolete but you can continue to find support here. The popular Unidrive could be set up for a range of applications in minutes thanks to the preloaded parameters and operated in five different modes including both open and closed loop.

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  • Lynx

    Lynx DC drives

    The Control Techniques Lynx is a series of DC drive manufactured by Control Techniques. As an official Control Techniques distributor, Northern Industrial can continue to support users of the Lynx series even after the OEM as well a helping you to upgrade.

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  • Dinverter


    Although now obsolete, we can offer you the specialist support you need for your Dinverter variable speed drives at an extremely competitive price, therefore reducing the usual worries that occur when running an obsolete part.

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  • Commander CD

    Commander CD

    The Commander CD range of inverters was manufactured by Control Techniques from 1986 to 1993. Although now obsolete, many companies still run the Commander CD series in their plants which is why we offer specialist repairs, upgrade advice and a large stock of new and refurbished drives available for purchase.

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  • Commander SE

    Commander SE

    Commander SE AC inverter drives are simple to use and easy to install. Its first 10 parameters meet the needs of nearly 80% of drive applications. This inverter drive has now been superseded by the Commander SK and now the Unidrive M but fear not, you can still get the best support for the SE from Northern Industrial.

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  • MaxAx


    With Northern Industrial you can enjoy the support of an official Control Techniques distributor for your MaxAx 100, MaxAx 200 and MaxAx 300 servo drives, all at an outstanding price. Our huge stock means, you never need worry about sourcing spares or repairs for your obsolete Control Techniques MaxAx drives again.

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Control Techniques

Control Techniques Repairs

Northern Industrial has been a distributor for Control Techniques for over 10 years. During this time our electronics engineers have become well versed in the repair and refurbishment of Control Techniques AC Drives, Servo Drives & DC Drives. We have test facilities for all types of Control Techniques drives and stock the largest selection of Control Techniques internal printed circuit boards, replacement cases and connectors. Worried about losing your parameters or need onsite support? We will always aim to backup your parameters before repairing your faulty drive and have a team of engineers who can come to site to commission or decommission your faulty drive.


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