Digitax HD

0.7 Nm – 51 Nm with 153 Nm peak
1.5 A – 16 A with 48 A peak
200 V | 400 V
0.25 kW – 7.5 kW

Minimum size, maximum performance

The Digitax HD servo drive series extends the Unidrive M range with maximum servo performance in a minimum size package. Optimized for high-dynamic applications, Digitax HD provides the flexibility of both standalone and modular configurations. The drive offers full servo control plus open loop permanent magnet motor and induction motor control across four functionality levels: EtherCATMCi machine controlEthernet and the flexible Base servo drive.

EtherCAT device for centralized motion control applications
Digitax HD M753 EtherCAT features an integrated 2-port EtherCAT switch for easy integration into centralized motion control applications.

EoE (Ethernet over EtherCAT) support allows pc-tool connection for commissioning and monitoring over the EtherCAT network. The new servo drive can operate with motion controllers, motion PLCs and Industrial PCs via built-in EtherCAT.


    Reduce cost with small servo drives

    Minimal footprint and exceptional power density make Digitax HD one of the smallest servo drives on the market today. This means that you can build the most compact cabinets possible.

    • Drive width of only 40mm
    • Reduce cabinet height with UltraFlow™ technology which dissipates heat directly outside of the cabinet
    • Install Digitax HD in a cabinet just 200mm deep


    Boost throughput with maximum motion control

    Optimized for high-dynamic applications and with high speed control loops, Digitax HD is one of the best performing servo drives on the market today. This means maximum throughput and product quality from your machines.

    • 300% peak current performance pulse-duty overload
    • Optimized control loops for high dynamic performance
    • Up to 16 kHz switching frequency

    Rapid installation and commissioning from standalone to a modular servo system

    Digitax HD servo series can be used standalone and is also fast and easy to set up as a modular system.

    • Single AC input, 24v and communication links, and common DC bus
    • DIN rail alignment, single cable technology and easy access pluggable connectors
    • Fast programming and commissioning PC tools

    Global reach, local support

    Highly experienced, locally based Application Engineers design and support drive technology to provide maximum value, wherever you are in the world. Are you ready to find out how the narrowest servo drive on the market will serve all your automation needs?


    Maximise performance
    • 300% peak current performance pulse-duty overload
    • Optimized control loops for high dynamic performance
      • 62.5 μs current loop
      • 250 μs position and speed loop
    • Up to 16 kHz switching frequency (default ratings specified at 8 kHz)
    • Supports a wide range of feedback technologies including Quadrature, SinCos (including absolute), SSI, BiSS, EnDat (up to 4 Mb with EnDat 2.2) and resolvers
    • Maximum performance package with high torque density, low inertia Unimotor hd servo motors
    • On-board Advanced Motion Controller for distributed 1.5 axis motion control
    • High speed network synchronisation of less than 1 μs jitter


    Minimum size
    • 40 mm drive width and option bracket adds 22 mm, providing a highly competitive maximum drive width of 62 mm
    • MCi210 Machine Control module for complete standalone capability, removing the need for an external controller
    • Reduce cabinet height by directly stacking rows of drives. Patented Ultraflow™ technology expels heat directly outside of the cabinet through the rear of the drive (drive heat dissipation can also be achieved via vents on the top of the drive, as standard).
    • Fits into cabinets just 200 mm deep
    Easy installation and setup
    • DIN rail alignment
    • Kits for easy multi-axis installation
    • Single motor cable and electronic motor name plate for fast set up
    • Seamless motor-drive pairing with Unimotor hd servo motors from Control Techniques
    • Easy access pluggable connectors
    • Rapid commissioning with the Unidrive M Connect PC tool and SD cards


    • Operate with any automation product via EtherCAT- Operate with motion controllers, motion PLCs and Industrial PCs via built-in EtherCAT- Dual 100Mbps EtherCAT interfaces for use with in line topologies- Non-cyclic data communication using the CoE mailbox
    • Flexibility for all applications achieved through full access to drive functions- CANopen over EtherCAT (CoE) including:
      • CIA-402 profile
      • Cyclic sync position mode
      • Interpolated position mode
      • Velocity mode
      • Profile torque mode
      • SDO access to all profile objects and drive parameters
    • An optional RS485 adaptor is available, providing a back-up pc tool connection in case of network failure


    Safety on-board
    • Reduced downtime with machine safety- Integrated dual safe torque off- Meets SIL3 (Safety Integrity Level 3) and PLe (Performance Level e)


    System Integration Modules – Feedback
    SI-Encoder Feedback System Integration Module


    Quadrature encoder input interface module.

    SI-Universal Encoder Feedback System Integration Modules

    SI-Universal Encoder

    Encoder input and output interface supporting Quadrature, SinCos, EnDat and SSI encoders.

    System Integration Modules – Communications
    Connects Unidrive, Commander, Digitax and the Pump Drive families to all POWERLINK networks. SI-POWERLINK serves applications ranging from simple open-loop systems through to those demanding precise motion control. The protocol is based upon standard Ethernet and provides a solution for real-time Industrial Ethernet to satisfy the requirements of industrial automation and process control.

    SI-Profibus Communication System Integration Modules


    SI-PROFIBUS interface module enables follower connectivity. It is possible to use multiple SI-PROFIBUS modules or a combination of SI-PROFIBUS and other option module types to add additional functionality such as extended I/O, gateway functionality or additional PLC features.

    SI-Devicenet Communications System Integration Module


    SI-DeviceNet enables follower connectivity. It is possible to use multiple SI-DeviceNet modules to provide additional functionality.

    SI-CANopen Communication System Integration Module


    Digitax HD’s SI-CANopen interface module supports various profiles, offering optimum flexibility.

    SI-Ethernet Communication System Integration Module


    SI-Ethernet can be used to provide high speed drive access, global connectivity and integration with IT network technologies. 

    SI-EtherCAT Communications System Integration Module


    SI-EtherCAT allows Digitax HD servo drive to connect and interface with EtherCAT networks.

    SI-Profinet Communications System Integration Module 


    SI-PROFINET allows Digitax HD to communicate and interface with PROFINET PLCs and networks.



    Interbus interface modules.

    System Integration Modules – Applications

    MCi210 System Integration Module with a dual port Ethernet


    Extended advanced machine control, provides MCi200 functionality with additional ports and simultaneous connectivity to 2 separate Ethernet networks.

    MCi200 system integration module


    Second processor, providing advanced customization using industry standard IEC61131-3 programming languages.

    SI-Apps Compact System Integration Modules

    SI-Apps Compact

    Compatible module allows legacy SyPTPro application programs to be re-complied for HD.

    System Integration Modules – Additional I/O

    SI-IO System Integration Module


    Extended I/O interface module to increase the number of I/O points on a drive. Provides additional: 4 x Digital I/O, 3 x Analog inputs (default)/Digital inputs, 1 x Analog output (default)/Digital input, 2 x Relays.


    KI Compact Display Option module for servo drive

    KI-Compact Display

    The display (fitted on M753 & M750, optional on M751) ensures access to drive diagnostics even in the absence of network connectivity. Includes 2 rotary switches for hardware setting of the node address for faster commissioning of the motion network.


    KI-Compact 485 Adaptor

    This allows the drive to communicate via RS485. This is commonly used for programming if the drive has no keypad.


    Remote Keypad RTC

    The keypad is remote mountable, allowing flexible mounting on the outside of a panel (meets IP54/NEMA 12). Three line plain text, multi-language LCD keypad for rapid set-up and helpful diagnostics. Battery operated real-time clock allows accurate time stamping of events, aiding diagnostics.

    Drive interface units – Communications
    control techniques usb cable

    CT USB Communications Cable

    The USB Communications cable allows the drive to connect to a PC for use with our PC tools*.

    digitax m75c capshare servo

    Digitax M75C CapShare

    Capacitor module (200 V and 400 V) with thermal protection to increase maximum energy storage capacity, and optimise energy efficient usage.


    For the complete list of accessories, please see the Digitax HD brochure.

    * Also requires KI-Compact-485 adaptor.


    Commissioning and monitoring software


    Connect – Commissioning tool
    Based on Control Techniques’ 25 years’ experience, Connect is our latest drive configuration tool for commissioning, optimizing and monitoring drive/system performance.

     Automation and motion programming software

    Machine-Control-Studio Machine Control Studio – Programming tool
    Control Techniques’ Machine Control Studio provides a flexible and intuitive environment for programming Digitax HD’s new automation and motion control features



    Click here to download Control Techniques Brochures


    Title Issue File
    Size Lang  
    CTNet User Guide 9 pdf 2.05 MB EN
    Digitax M750 Control User Guide 1 pdf 13 MB EN
    Digitax M751 Control User Guide 3 pdf 15 MB EN
    Digitax M753 Control User Guide 3 pdf 17 MB EN


    Title Issue File
    Size Lang  
    Digitax M75X Power Installation and Technical Guide 6 pdf 26 MB EN


    Title Issue File
    Size Lang  
    Digitax M75X Quick Start Guide 2 pdf 3.04 MB EN


    Title Issue File
    Size Lang  
    Migration Guide from SM-Interbus to SI-Interbus 1 pdf 331 KB EN
    SI-Applications Compact User Guide 1 pdf 1.52 MB EN
    SI-Applications Plus User Guide 3 pdf 2.28 MB EN
    SI-CANopen User Guide 2 pdf 3.88 MB EN
    SI-DeviceNet User Guide 3 pdf 1.61 MB EN
    SI-Encoder User Guide 2 pdf 937 KB EN
    SI-Ethercat User Guide 4 pdf 3.59 MB EN
    SI-Ethernet User Guide 4 pdf 3.00 MB EN
    SI-I/O User Guide 4 pdf 1.73 MB EN
    SI-INTERBUS User Guide 1 pdf 3.26 MB EN
    SI-POWERLINK User Guide 1 pdf 4.45 MB EN
    SI-PROFIBUS User Guide 4 pdf 2.65 MB EN
    SI-PROFINET V2 User Guide 2 pdf 1.83 MB EN
    SI-Safety User Guide 5 pdf 1.30 MB EN
    SI-Universal Encoder User Guide 3 pdf 1.61 MB EN


    Title Issue File
    Size Lang  
    Connect Drive Commissioning Software zip 215 MB EN
    CTScope V2.6.0 zip 29 MB EN
    Machine Control Studio PLC Programming V01.10.00 zip 1246 MB EN
    PLC Controlled Motion v1.5.0 zip 121 MB EN
    PowerTools Studio zip 66 MB EN
    SyPTPro Upgrade v02.08.02 zip 86 MB EN


    Title Issue File
    Size Lang  
    Digitax HD M751_M753 Size 01, 2D dxf 1 dxf 2.29 MB EN
    Digitax HD M751_M753 Size 02, 2D dxf 1 dxf 2.24 MB EN
    Digitax HD M751_M753 Size 03, 2D dxf 1 dxf 2.28 MB EN


    Title Issue File
    Size Lang  
    Digitax HD M75X, Size 01, 3D stp 1 zip 9 MB EN
    Digitax HD M75X, Size 02, 3D stp 1 zip 9 MB EN
    Digitax HD M75X, Size 03, 3D stp 1 zip 8 MB EN


    Title Issue File
    Size Lang  
    Digitax HD M75X Compact Braking Resistor Installation Sheet 2 pdf 1.09 MB EN
    Digitax HD M75X Series Capacitor Module IS 2 pdf 474 KB EN
    Digitax HD M75X SI-Option Mounting Kit Installation Sheet 2 pdf 2.58 MB EN


    Title Issue File
    Size Lang  
    Digitax HD M750 Parameter Reference Guide 01.19.00 zip 20 MB EN
    Digitax M751 Parameter Reference Guide 01.18.00 zip 8 MB EN
    Digitax M753 Parameter Reference Guide (EtherCat 01.03.05) 01.18.00 zip 8 MB EN


    Title Issue File
    Size Lang  
    ESI – EtherCAT – Digitax HD M753 zip 288 KB EN
    SI-EtherCAT V01.03.05.02 ESI Files V01.03.05 zip 39 KB EN


    Title Issue File
    Size Lang  
    EDS – EtherNet – Digitax HD M750 zip 40 KB EN
    ESI – EtherCAT – Digitax HD M753 zip 288 KB EN
    GSDML – ProfiNet – Digitax HD M750 zip 232 KB EN


    Title Issue File
    Size Lang  
    Dynamic Braking Resistor Data Sheet 1 pdf 333 KB EN


    Title Issue File
    Size Lang  
    Connect Drive Commissioning Software V02.11.03 V02.11.03 zip 115 MB EN
    Machine Control Studio PLC Programming V01.09.04 zip 1234 MB EN


    Title Issue File
    Size Lang  
    Control Techniques Sistema Library 2.08 zip 245 KB EN


    Title Issue File
    Size Lang  
    Declaration of Conformity under the Machinery Directive – SI-Safety 1 pdf 19 KB EN