Motor Control Centres

Starting Modes 

There are many motor operation set-ups that require different powering and control circuits to achieve correct functionality.
The most common include:

1. Direct on Line (DOL) with Local, Remote or automatic Start/ Stop with field devices like float switches Start/ Stop with Float Switch Control
   
   
2. Reversing Direct on Line (DOL) starters
   
   
3. Star – Delta starters: A star delta starter is the most commonly used method for the starting of a 3 phase induction motor. In star delta starting an induction motor is connected through a star connection throughout the starting period. Then once the motor reaches the required speed, the motor is connected through a delta connection.
   
   A star delta starter is a type of reduced voltage starter. We use it to reduce the starting current of the motor without using any external device or apparatus. This is a big advantage of a star delta starter, as it typically has around 1/3 of the inrush current compared to a DOL starter.
   
   
4. Electronic Soft Starters: An Electronic soft starter is a device used with AC electrical motors to temporarily reduce the load and torque in the powertrain 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.
   
   
5. Variable Speed Drives: A variable-frequency drive (VFD) is a type of motor drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency, to control voltage or current variation
   
   VFDs are used in applications ranging from small appliances to large compressors. More than 40% of the world’s electrical energy is consumed by electric motor driven systems.
   
   Over the last four decades, power electronics technology has reduced VFD cost and size and has improved performance through advances in semiconductor switching devices, drive topologies, simulation and control techniques, and control hardware and software.