This application note describes basic installation and operation of manual motor starters with a push-in terminal type contactor. It describes the different ratings, ratings of different types of motors and the way of operation. It also describes the different types of faults and the way of dealing with them. It gives basic information on the use and the basic parts of manual motor starters.
The following topics are dealt with in this application note:
What is a manual starter
Manual motor starters vs. protection circuit breakers
Rotation of the motor
Wear (long term)
Different types of motors
MPCBs work on the same principle as motor starters and are used in the same applications. They can be connected directly to the mains or fed with an inverter. They can also be utilized by the motor-electrical control (MEC) of variable-frequency drives (VFDs) and variable-speed drives (VSDs). The electrical connections to the three-phase mains are controlled by a switch-on relay and an overload relay is installed to provide additional capacity. On the other side of the motor winding, a surge arrester is usually provided. The mains connection is normally a screw or Push-in Spring terminal and the ground connection is made with a clamp terminal.
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