Thyrirstor AC Motor Soft Starters 1,2 And 3 Phase

Product Details:

Features:

• Suitable for 3 phase AC Induction motor up to 205KW (275HP)
• Semikron make SCR modules (SKKT series)
• Reduces starting current
• Motor connection for both 3 wire close delta (In line)
• and 6 wire open delta (in-side line)
• User settable jump start and soft start / ramp time
• Accepts start and stop command from external potential free contact
• Over load trip facility and built in motor protection
• Contactor bypass output and Fault output
• Easy to install and maintain

Model Wise Description:



Description:
A motor soft starter is a device used with AC electrical motors to temporarily reduce the load and torque in the power train and electric current surge of the motor during start-up. This reduces the mechanical stress on the motor and shaft, as well as the electrodynamic stresses on the attached power cables and electrical distribution network, extending the lifespan of the system.

To gradually accelerate the speed of AC 3 phase induction motor it is required to feed increasing voltage to the motor and such behavior is only possible by connecting SCRs in series with the motor.   The SCRs are controlled by MSST-15 firing card to generate the firing pulses giving the effect of soft start. Libratherm offers ready to use motor soft starter MSS-XX for 3 phase induction motor. User has access to set the starting voltage to create the torque and to set the soft start time. For over load trip, the feedback it taken from internal CT to monitor the load current and to generate the trip contact in case of over load condition. Once the motor achieves full RPM, it is not required to pass the current through the SCRs and hence these SCRs can be bypassed using external bypass contactor.

Additional Information:

• Item Code: MSS-106