Electrical Equipment: Motor Controllers and Operation

Explain the purpose of a motor controller. Describe the features of a typical AC motor controller contactor. Describe how a motor controller can protect a motor. Using an electrical diagram identify the parts of a typical AC motor controller and describe the function of each part. State the purpose of overload devices. Explain the difference between thermal and magnetic overload devices. Identify the parts of typical overload devices and describe their operation. List typical steps for starting up a motor. Describe normal operating checks associated with motor operation. List typical steps for shutting down a motor.