High Power Modular Drives


Control Techniques has extended its range of high power modular drives. Both its Unidrive M and Powerdrive F300 variable speed drive ranges are now available in the larger frame size 11, providing a flexible method of building compact, reliable high-power solutions.

Paralleled together, Unidrive M can control asynchronous and permanent magnet motors in systems up to 2.8 MW (4,200 hp).

The new frame 11 is a 250 kW (400 hp) module that allows system builders to create high power solutions with the smallest number of components, keeping both footprint and costs to a minimum.

Unidrive M differentiates itself on performance with extremely fast current control algorithms and high switching frequencies. Active Front End (AFE) solutions deliver unparalleled torque precision and power quality.

The Unidrive M modules can be paralleled into a wide range of flexible solutions to solve all system needs including Active Front End and multi-pulse rectifier configurations. They can be controlled by Control Techniques’ Unidrive M600, M700, M701 and M702 controllers.



  • Minimize downtime for critical operations
    • Unidrive M high power modules have exceptional build quality based on over 40 years' of drive knowledge, expertise and development
    • Emerson Automation Centers are situated in all global regions to provide local design consultation and rapid specialist technical support


  • Reliability assured
    • Every Unidrive M power module has been thoroughly tested in environmental chambers that cycle a wide range of load and thermal conditions
    • PCBs have conformal coating to further increase resilience to harsh environmental conditions
    • Trip avoidance features take intelligent action instead of interrupting critical processes
    • Protection alarms safeguard the wider system
    • Intelligent variable speed fans ensure operating temperature stays within limits
    • Wide supply voltage tolerance keeps drive operation smooth in areas where supplies are variable

  • Create flexible systems easily
    • The modular approach to building high power systems provides machine builders with flexibility while keeping complexity low
    • Modules with integrated rectifiers and/or line chokes can be easily paralleled
    • Separate inverter and rectifier modules (D, RECT..A and RECT..T) can be paralleled into common DC bus and regenerative configurations

  • Flexible and easy system design
    • Unidrive M high power modules are designed to fit in standard 600 mm deep x 400 mm wide (23.6 x 15.7 in) cubicles
    • 6,12,18 and 24 pulse input and Active Front End configurations are easy to achieve
    • Integrated cooling fan power supply means no additional power supplies are required
    • Output current ratings have been increased to use fewer modules per system
    • A common control interface ensures a consistent programming method and feature set across the whole Unidrive M range


  • Make compact, easily maintainable systems
    • Overall system size and footprint is kept to a minimum
    • Manageable small and light modules are maintained and replaced rapidly and easily
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