Question

what are the two basic types of control circuits

Answer 1

Please i am requesting you not to forget to upvote,Thank you.

Answer:

The Two Basic Types of Control circuits are:

1)Two-wire control circuits

2)Three-wire control circuits.

1)Two-wire control circuits

• A two-wire control circuit is a simple switch that build or break the connection to a motor.
• Two-wire control cir­cuits are operated by manual control devices such as the open starter, manual push-button starter.
• This type of control circuit provides overload protection for the motor connected to it and provides under-voltage or no-voltage release.
• If the motor is stopped by a power interruption, the two-wire control device will not open. Since the control device does not open, the motor will restart when power is restored to the system.
• Two-wire control circuits are used in appli­cations where self restarting characteristic is desirable. Since two-wire control does permit automatic restarting of equipment,

2)Three-wire control circuits.

• Three-wire control circuits are generally op­erated by momentary contact pilot devices. The simplest example of a three-wire control circuit is probably the start-stop, push-button.
• A set of auxiliary contacts controlled by M coil is connected parallel to the start button. These contacts are generally referred to as maintaining, sealing, or holding contacts. The job of this contact is to hold the coil in the circuit after the start button has been used to energize the relay.
• Three-wire control is used to a much greater extent than two-wire control because of its flexi­ bility. Pilot devices such as push buttons can be located at remote locations such as control panels.