Soft Starters - Digistart D2 & D3

Control Techniques Soft Starters - Digistart D2 & D3

Digistart is Control Techniques’ flexible soft starter range for motor control and protection in constant-speed applications.

The Digistart range combines advanced control features with simple installation and commissioning. Digistart is an integral part of our comprehensive product range designed to meet all your motor control needs.

Soft starters are a simple and economic method of controlling AC motors for fixed-speed applications. Traditional methods of starting motors such as across-the-line (ATL) or wye-delta, result in increased machine wear through rapid acceleration and very high peak currents.

Soft starters solve this problem by controlling the acceleration and deceleration phases of operation.


Digistart D2

The Complete, Compact Motor Start Solution


Digistart D3

The Intelligent Motor Start Solution

Digistart D2

5 hp - 150 hp
200 - 575 Volts

The smallest and easiest to use Digistart D2 series sets up with simple potentiometer adjustments. It has one of the smallest foot prints available and includes a built-in bypass contactor, which allows smaller, non-ventilated enclosures, making it ideal for MCC applications. 

Applications for digital soft starter Digistart D2

Digistart D2 is ideal for a wide range of applications, including:

  • Conveyors

  • Fans

  • Pumps (Centrifugal & Submersible)

Digistart D2- Compact Digital Soft Starter with Motor Protection

The Digistart D2 is among the most compact constant current/current ramp soft starters available. The built in bypass contactor eliminates heat dissipation and energy losses by bridging out the power devices once the motor is at full speed. This eradicates the need for external bypass contactors saving panel space, simplifying installation and allowing the use of non-ventilated enclosures.

Digistart D2 units can be mounted side-by-side and are DIN rail mountable up to 60 A. This is ideal where multiple soft starters are required such as in motor control centers.

Digistart D2


  • Motor Current Protection

  • Universal Input Voltage (200-575 VAC)

  • Compact Design, Smallest Footprint

  • Built-in Bypass Contactor

  • DIN Rail Mounting Up To 60 A

  • 2 Wire or 3 Wire Start Stop Control Circuit

  • Modbus, Profibus and DeviceNet Options

  • Remote Operator Option

  • Constant Current Start

  • Current Ramp Start

  • Equi-Vec™ Balanced Vector Control Technology



Digistart D2 options include remote keypad and communication modules:


 Digistart CS Keypad


Remote Keypad Kit (remote operator & Serial Interface Module)

Finger Guard  


Finger guard provide IP20/NEMA1 protection for larger models


  • Communications

    Drive interface units - Communications


    Modbus Interface Module


    Profibus Interface Module.


    DeviceNet Interface Module


    USB Interface Module.

    Drive interface units - Communications


    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

    Digistart D3

    5 hp – 2,000 hp

    200-440 | 380-690 Volts

    The Digistart D3 series utilizes the latest technology in soft starters, including new adaptive acceleration technology for the ultimate in control. The Digistart D3 is a complete motor starting and management system with an extensive range of features in a single user friendly package.Digistart D3 Soft Starter

    Never before has motor control been so simple for jobs of all sizes and needs, such as pumps, band saws, conveyors and more.

    Benefits of the Digital Soft Starter Digistart D3
    • Models from 23 A to 1600 A

    • 200-440 VAC and 380-690 VAC models

    • In-line Motor Connections

    • Control Voltage 110 V - 460 V

    • Adaptive Acceleration Control

    • Easy to install

    • User friendly controls

    • Complete feature set

    • Ultimate motor protection

    • “Power Through” emergency operation



    Advanced motor control

    Digistart D3 provides industry leading motor control, featuring constant current, current ramp and adaptive control start methods. Adaptive control is an innovative control method that not only controls motor current but also acceleration. It allows the user to select between early, constant or late acceleration/deceleration depending upon the application requirements. Adaptive control then monitors motor performance by analyzing each start and adjusting accordingly to maintain optimum control.

    Adaptive control can benefit many applications. A principle example is pumping where it can be used to eliminate water hammer by allowing the engineer to select the most appropriate deceleration profile for the system.

     Digistart Adaptive Acceleration

    Compact and flexible installation

    The compact Digistart D3 features an internal by-pass (on models up to 220 A), reducing space and costs through eliminating the need for external components. In addition, higher power units from 360 A allow the power connections to be configured on the top or bottom of the unit for both input and output, simplifying the cabling. Units can be mounted side-by-side to further reduce cabinet space.

    Easy configuration and monitoring

    The Digistart D3 keypad has Digistart IS Displaya multi-language graphical display, allowing you to easily set-up and monitor your soft starter. Start-up wizards guide the user through common application configurations and reduce commissioning time. The customizable display also provides real-time performance monitoring and time stamped event logs that can be used for maintenance and diagnostics, helping to improve plant availability.

    Fire mode

    Digistart D3 has an in-built fire mode. This is used in HVAC applications to help protect building occupants in the case of fire by pressurizing escape routes to maintain a smoke free environment. Activation of this feature disables the soft starter protection ensuring it continues to run for as long as possible.

    Power through operation

    Digistart D3’s power through operation ensures the soft starter will continue to operate using 2 phases if one of the power devices is damaged. This allows you to keep your plant running whilst a long term fix is found.

    Increased output

    The Digistart D3 allows the motor to be connected either in-line (three wire) or using an inside delta configuration (six wire). Inside delta configuration increases the power of the soft starter, meaning a smaller unit can be used. This is a compact, cost efficient solution when replacing wye/delta starters where existing wiring can be used.


    Digistart D3 options include remote keypad, communication modules.

    In addition an I/O card, RTD and Ground Fault card and Finger guards options are also available.


    D3-Keypad Mount: Remote Mounting kit for keypad

    Finger Guard

    D3-Finger Guard: Finger guard provide IP20/NEMA1 protection for larger models


    D3-I/O: adds 2 x digital inputs, 3 x relay outputs, 1 x analog input and 1 x analog output

    D3-RTD & GND fault: the RTD (resistive temperature device) and GND (ground fault protection) card provides additional 6 x PT100 RTD inputs and 1 x ground fault input.


    Digistart-Modbus: Modbus Interface module

    Digistart Profibus


    Profibus Interface Module.

    Digistart DeviceNet


    DeviceNet Interface Module.



    USB interface module.


    • Drive interface units - Communications


      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



      To enjoy the benefits Control Techniques' latest range of solutions, see the upgrade information below to find the appropriate current product. Upgrading provides longer term reliability and performance enhancements.

      The following table provides a summary of the recommended upgrade path:







      Digistart D3



      Digistart D2





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Microcon Technologies Inc.

1105 Crestlawn Drive, Unit # D8 & D9

Mississauga, Ontario L4W 1A7 Canada

Tel: (905) 602-4770

Fax: (905) 602-4779