A new soft starter range has been launched by Control Techniques. The range comprises two product families, the ultra compact Digistart CS for induction motors up to 110kW, and the Digistart IS for induction motors up to 800kW.
The Digistart CS version is amongst the most compact soft starters on the market. It is easy to use, configured in seconds using simple rotary switches, yet provides comprehensive motor protection, so that no external devices are required. It features a built-in bypass contactor that eliminates the need for external bypass contactors and reduces heat dissipation and energy losses by bridging out the power devices once the motor is at full speed. This feature saves panel space and often allows the use of non-ventilated enclosures.
The intelligent Digistart IS version provides industry-leading motor control; with several start methods available including constant current, current ramp and new, advanced “adaptive control”. The latter provides an unprecedented level of control over acceleration/deceleration by enabling the user to select the ideal start/stop profile for the application. Adaptive control then monitors the motor performance by analysing each start/stop and adjusting accordingly to maintain optimum control. One application where this is a significant benefit is in pumping where it can be used to eliminate annoying and damaging water hammer effects.
The Digistart IS features a multi-language user interface with in-built start-up wizards for ease of commissioning, real-time performance monitoring and informative event logs. All parameters are viewed in real engineering units and can be displayed numerically or graphically. The user interface is IP65 rated and can be mounted remotely, for example on the cabinet door. Models up to 110kW (220A) feature an internal bypass contactor.
Both Digistart CS and Digistart IS support optional network communications with Profibus, DeviceNet and Modbus RTU protocols.