Unidrive M400 AC Drives

Fast setup and diagnosis with real-text display, integrated PLC and safety inputs

Unidrive M400

Quick setup and diagnostics with real text display, onboard PLC and safety inputs

0.33 hp – 200 hp (0.25 kW – 132 kW) Normal Duty
0.33 hp – 150 hp (0.25 kW – 110 kW) Heavy Duty

115 V | 208 - 240 V | 380 - 480 V | 575 V | 690 VAC Drive Unidrive M400

Control Techniques’ Unidrive M400 variable frequency AC drive (VFD) minimizes downtime with an optional plain-text, multi-language backlit LCD keypad enabling rapid setup and clear diagnostic help.

The integrated PLC can execute a substantial range of sequencing and logic programs. Unidrive M400 has an impressive onboard I/O count, dual Safe Torque Off (STO) inputs, and can accommodate a single SI option module for additional flexibility.

The SI module has options for industry standard fieldbus, Ethernet, and expanded I/O. Additionally, an AI option slot is available for parameter cloning, 24V backup, and Modbus RTU communication options. A CI-485-ADAPTOR is also available to provide additional Modbus RTU communications in place of the optional keypad.

  • Features
    Minimize downtime and system setup time with advanced keypad options
    • Informative, multi-language, 3 line display aids setup and provides diagnostic information
    • 4 navigation buttons facilitate intuitive navigation and programming
    • Keypad options available: No keypad as standard
      • CI-Keypad-LCD: Drive mounted LCD plain-text keypad
      • Remote-Keypad: IP66 (NEMA 4) rapid panel mount (1 x 32 mm dia hole)
      • Remote-Keypad-RTC: IP54 (NEMA 12) panel mounted, LCD plain-text with Real-Time Clock for timestamping diagnostic information
      • No keypad (standard): Control/programming performed by PC or communications

    Enhance up-time and system flexibility
    • Flexible system integration and remote diagnostics through optional industrial Ethernet and fieldbus communications
    • Flexible I/O that is expandable with SI-I/O option module
    • Unidrive M400 incorporates an onboard PLC which can execute Machine Control Studio programs for logic and sequencing with real-time tasks - removing the need for additional PLC's

    Complete IEC 61131-3 programming environment
    • Structured text (ST), function block (FBD), sequential function chart (SFC), ladder diagram (LD), instruction list (IL), and continuous function chart (CFC)

    Improve throughput with advanced open-loop motor control algorithms
    • Rotor Flux Control (RFC-A) provides exceptional induction motor control and high stability for demanding applications
    • S-ramp accel / decel profiling provides smooth speed transitions to minimize “jerk”
    • 180% motor overload suitable for heavy industrial machinery applications
    • Precise frequency following is possible form an encoder or frequency/direction inputs

    Conform to safety standards, maximize uptime and reduce costs by integrating directly with safety systems
    • Unidrive M400 has integrated dual STO inputs for SIL3 / PLe conformity, eliminating the need for external safety components

  • Specifications
    Key data

    Heavy Duty ratings:

    • 115 V: 0.33 hp to 1.5 hp (0.25 kw – 1.1 kW)
    • 230 V: 0.33 hp to 75 hp (0.25 kW – 55 kW)
    • 460 V: 0.5 hp to 150 hp (0.37 kW – 110 kW)
    • 575 V: 2.0 hp to 125 hp (1.5 kW – 90 kW)
    • 690 V: 20 hp to 150 hp (15 kW – 110 kW)

    Normal Duty ratings:

    • 115 V: 0.33 hp to 1.5 hp (0.25 kw – 1.1 kW)
    • 230 V: 0.33 hp to 100 hp (0.25 kW – 75 kW)
    • 460 V: 0.5 hp to 200 hp (0.37 kW – 132 kW)
    • 575 V: 2.0 hp to 150 hp (1.5 kW – 110 kW)
    • 690 V: 20 hp to 175 hp (15 kW – 132 kW)

    Supply phases:

    • Frame size 1 to 2: 115 V - 1Ø | 230 V - 1Ø or 3Ø
    • Frame size 3 to 4: 230 V - 1Ø or 3Ø | 460 V - 3Ø
    • Frame size 5 to 6: 230 V - 3Ø | 460 V - 3Ø | 575 V - 3Ø
    • Frame size 7 and up: 230 V - 3Ø | 460 V - 3Ø | 575 V - 3Ø | 690 V 3Ø

    Control connections: 4x Analog I/O, 7x Digital I/O, 2x STO, 1x Relay

    Feedback: AB encoder input, speed follower

    Intelligence: Onboard PLC

    Drive rating: IP21 / UL open class, UL type 1 with conduit box kit

    Machine Safety: Dual Safe Torque Off input terminals

    Keypad: No keypad as standard

    • CI-Keypad: Drive mounted plain-text, multi-language, LCD keypad
    • Remote-Keypad: Remote mountable, plain-text, multi-language LCD keypad allows flexible mounting outside of a panel and meets IP66 (NEMA 4).
    • Remote-Keypad-RTC: The keypad is remote mountable, enabling 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

    System Integration options slots: 1, frame size 2 and up

    Parameter cloning: PC Tools, SD card with AI-Backup-Adaptor or AI-Smart-Adaptor



    100 V (100 V - 120 V ± 10%)

    200 V (200 V - 240 V ± 10%)

    400 V (380 V - 480 V ± 10%)

    575 V (500 V - 575 V ± 10%)

    690 V (500 V - 690 V ± 10%)



    Open-loop vector or V/Hz induction motor control

    Open-loop Rotor Flux Control for induction motors (RFC-A)

    Open-loop permanent magnet motor control (RFC-S)


    Closed-loop Rotor Flux Control for induction motors (RFC-A)


    Closed-loop permanent magnet motor control (RFC-S)


    Active Front End (AFE) power quality convertor



    Approval & Listings


    USA and Canada (cUL Listed). UL File number: E171230


    European Union
    All applicable directives and regulations: LVD, EMD, RoHS, REACH, Energy Related Products


    United Kingdom

    All applicable regulations


    Australia and New Zealand

    Responsible Supplier Registration No. E6934


    Russian Customs Union

    All models


    TÜV Rheinland Type Examination Certificates:
    01/205/5383.04/20 (Unidrive-M400 frame sizes 1 – 4)
    01/205/5387.03/20 (Unidrive-M400 frame sizes 5 – 10)
    The safety function "Safe Torque Off" can be used in applications up to Cat 4. PL e according to EN ISO 13849-1, SIL 3 according to EN 61800-5-2/ EN 62061/ IEC 61508, and in lift applications according to EN 81-1 and EN81-2.

    Functional Safety for Elevators

    TÜV Nord certificate:

    44 799 17002402 Frequency converters with Safe Torque Off function for lift drives.


    Quality system: ISO 9001 (Certificate Nos. FM 739405)

    Environmental management system: ISO 14001 (Certificate No. EMS 739789)

    Occupational health and safety: ISO 45001 (Certificate No. 5430)

    China RoHS

    Chinese Order No. 32, 2016; Administrative Measures for the Restriction of Hazardous Substances in Electrical and Electronic Equipment (China RoHS 2),

    EPA TSCA regulations

    U.S. Environmental Protection Agency (“EPA”) recently promulgated regulations under the Toxic Substances Control Act (“TSCA”)

    IHM, Basel convention,

    MEPC 68/21 / Add.1, Annex 17, Resolution MEPC.269(68) 2015 Guidelines for the development of the inventory of hazardous materials.

    Responsible Minerals Initiative (RMI)

    CMRT compliance


    Weights & Dimensions



    WEIGHT kg(lb)






    160 x 75 x 130

    DIN rail mounting:
    137 x 75 x 130

    6.3 x 3.0 x 5.1

    DIN rail mounting:
    5.4 x 3.0 x 5.1

    0.75 1.65


    205 x 75 x 150

    DIN rail mounting:
    180 x 75 x 150

    8.1 x 3.0 x 5.9

    DIN rail mounting:
    7.1 x 3.0 x 5.9
    1.0 2.2


    226 x 90 x 160 8.9 x 3.5 x 6.3 1.5 3.3


    277 x 115 x 175 10.9 x 4.5 x 6.9 3.13 6.9


    391 x 143 x 192

    15.4 x 5.6 x 7.6




    391 x 210 x 221 15.4 x 8.3 x 8.7 14 30.9


    557 x 270 x 280 21.9 x 10.6 x 11.0 28 61.7


    803 x 310 x 290 31.6 x 12.2 x 11.4 52 114.6


    1108 x 310 x 290 43.6 x 12.2 x 11.4 66.5 146.6
    9E 1069 x 310 x 288 42.1 x 12.2 x 11.3 46 101.4

    All dimensions include mounting brackets except for the DIN rail alternative for frames 1 and 2.

  • Options
    CI-Keypad LCD

    Three line plain text, multi-language LCD keypad for rapid setup and helpful diagnostics maximizes machine up-time.

    Control Techniques Remote Keypad
    Remote Keypad

    All the features of the CI-Keypad LCD, but remote mountable. This allows flexible mounting on the outside of a panel and meets IP66 (NEMA 4); requires RS485 connection

    AC Drives Option Remote Keypad
    Remote keypad-RTC

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

    System Integration Modules - Communications
    SI-Profibus Communication System Integration Modules

    PROFIBUS interface module

    SI-Devicenet Communications System Integration Module

    DeviceNet interface module

    SI-CANopen Communication System Integration Module

    CANopen interface module supporting various profiles, including several drive profiles.

    SI-Ethernet Communication System Integration Module

    Ethernet module that supports EtherNet/IP and Modbus TCP/IP

    SI-Profinet Communications System Integration Module

    PROFINET RT interface module

    SI-EtherCAT Communications System Integration Module

    EtherCAT interface module



    Interbus interface modules.

    System Integration Modules - Additional I/O

    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 Digital input, 2 x Relays

    Drive interface units - Backup
    AI-Backup Adaptor

    Port adaptor for SD card parameter cloning, and an input for 24 V backup

    AI-Smart Adaptor

    Built-in memory for parameter cloning and 24 V backup

    Drive interface units - Communications
    AI-485-24V Adaptor

    Adaptor that allows the drive to communicate via RS485 using Modbus RTU can be used to connect remote keypad. This version of the adaptor includes a +24 V (100 mA)/+24 V user  back-up supply (up to 600 mA)

    AI-485 Adaptor

    Adaptor that allows the drive to communicate via RS485 using Modbus RTU can be used to connect remote keypad.


    CI-485 Adaptor

    Adaptor that allows the drive to communicate via RS485

    Control Techniques USB Cable
    CT USB Comms Cable

    The USB Comms cable allows the drive to connect to a PC for use with Unidrive M's PC tools via RS485*

    Operator Interfaces and HMI

    The powerful CTVue HMI (Human Machine Interface) line and integrated drivers for Control Techniques drives make it easy to integrate HMI with CT drives

    *Requires a drive RS485 port
  • Software
    Commissioning and monitoring software

     Control Techniques Unidrive M Connect Software

    Connect - Commissioning tool

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

    Learn More

    Automation and motion programming software

    Control Techniques Machine Control Studio Software

    Machine Control Studio - Programming Tool

    Control Techniques Machine Control Studio provides a flexible and intuitive environment for programming Unidrive M’s new automation and motion control features

    Learn More

    HMI software
    Control Techniques HMI Software
    CTVue HMI Software

    Control Techniques CTVue human interface software tool enables the operator to easily configure drive-related control variables.

    Learn More



  • Downloads
    Did you find what you wanted? If not submit a support request using our technical support ticketing system.

This website uses cookies to ensure you get the best experience on our website. Learn More