Unidrive M400 AC Drives
Unidrive M400
General Purpose AC Drive
0.25 - 132 kW (0.33 - 200 hp) 
100 V | 200 V | 400 V | 575 V | 690 V
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  • Specifications
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Optimised throughput and energy efficiency in industrial applications

Unidrive M400 is exceptional at combining the ease of use of our general purpose range with the capabilities of our high performance Unidrive M Series.

Add in an impressive I/O count, dual Safe Torque Off (STO) and integrated PLC, all of which contribute to making the M400 an extremely capable drive.  

*Obsessives included

The all-rounder drive of choice for OEMs 

  Minimise downtime and system set-up
The Unidrive M400 is designed with special attention to robustness and reliability. The multi-language, 3 line display, together with the intuitive navigation buttons aid set up and fast diagnostics.
  Improve throughput with advanced open-loop motor control algorithms
The Rotor Flux Control (RFC-A) mode gives maximum stability and control over induction motors at all powers.
  Reduce system costs by directly integrating with your applications
The M400 incorporates an onboard PLC which can execute Machine Control Studio (IEC61131-3) programs for logic control, sequencing, speed following and digital lock - removing the need for additional PLCs.
An optional System Integrator module can be fitted to the drive for additional I/O or fieldbus communications.
  Conform to safety standards by direct safety system integration
Unidrive M400 drives have integrated dual Safe Torque Off (STO) inputs, certified to SIL3 / PLe, providing an elegant and reliable safety solution. 



Minimize downtime and system set-up time with advanced keypad options

  • Informative, multi-language, 3 line display aids set up and provides diagnostic information
  • 4 navigation buttons facilitate intuitive navigation and programming
  • Keypad options available:
    • CI-Keypad - Drive mounted LCD keypad
    • Remote IP66 keypad - rapid panel mount (1 x 32mm Ø hole)
    • No Keypad - Control/programming performed by PC or fieldbus

Reduced system costs by directly integrating with applications

  • M400 incorporates an onboard PLC which can execute Machine Control Studio (IEC61131-3) programs for logic and sequencing with real-time tasks - removing the need for additional PLCs
  • Fit an SI module to add a fieldbus communications option or additional I/O

Improve throughput with advanced open loop motor control algorithms

  • Rotor Flux Control (RFC-A) gives maximum stability and control of induction motors at all powers
  • 180% motor overload suitable for heavy industrial machinery applications
  • Precise frequency following is possible from an encoder or frequency/direction inputs


Conform to safety standards, maximize uptime and reduce costs by integrating directly with safety systems

  • M400 has integrated dual STO inputs for SIL3 / PLe conformity, eliminating the need for external safety components



  Connect - intuitive commissioning software
Connect is our latest drive configuration tool for commissioning, optimising and monitoring drive/system performance.
machine-control-studio-icon  Machine Control Studio - programming tool
Control Techniques' Machine Control Studio provides a flexible and intuitive environment for programming new automation and motion control features.

Key data

  • Heavy Duty rating: 0.25 - 110 kW (0.33 - 150 hp)
  • Supply phases:
  • Size 1 to 4: 110 V drives – 1 phase, 230 and 400 V drives - 1 or 3 phase
  • Size 5 upwards: 3 phase


Standard features


  • Onboard PLC


  • Encoder input – Speed follower

Machine safety:

  • 2 x Safe Torque Off terminals
  • SIL3/PLe compliant


  • No keypad as standard

Option slots:

  • 1 (Size 2 and above)

Parameter cloning via:

  • PC tools
  • SD card with AI Smart Adapter


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)











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. 
*Additional fixings required to maximize security



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


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)


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


Operator Interface (HMI)
The MCh040 & MCh070 panels and MChMobile Software have been designed for the easy development of HMI applications including factory and building automation.

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
PROFIBUS interface module
DeviceNet interface module
CANopen interface module.

External Ethernet module that supports EtherNet/IP and Modbus TCP/IP
EtherCAT interface module

PROFINET RT 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 Analogue inputs (default)/Digital inputs, 1 x Analogue output (default)/Digital input, 2 x Relays

Optional accessories

AI-Backup-Adaptor AI-Back-up Adaptor
Port adaptor for SD card parameter cloning, and an input for 24 V back-up.             
AI-Smart-Adaptor AI-Smart Adaptor
Has a built-in memory for parameter cloning and an input for 24 V back-up.             
AI-485-Adaptor 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
AI-485-Adaptor AI-485 24 V 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).            
CT USB Comms Cable
The USB Comms cable allows the drive to connect to a PC for use with Unidrive M's PC tools*


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