Double Motor Control with Selector Switch Connection
Hey, today we are going to make a connection of double motor control with a Selector switch. Using this circuit, you can control(turn on or turn off) two electrical motors by just rotating the knob of the Selector switch. This circuit is mainly designed with a DOL starter, but you can make it with the star delta starter too. Here, you can control only one motor at a time. When one motor is running another motor will remain off condition. This type of arrangement is mainly used for water pump control in industries. When one motor needs to be kept as a spare to operate at the time of the breakdown of the other motor, this double motor arrangement is installed.
Double Motor Control with Selector Connection Diagram and Wiring
First of all. let's take a look at the connection diagram of double motor control with a Selector switch. Then we will discuss the components used in this circuit and the working principle.
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Now, let's go to know about the components used in this circuit.
Contactor
A contactor is an electrical device used to control the flow of electrical power in a circuit. When an electrical current is applied to the coil, it creates a magnetic field that pulls a movable armature towards it. When the armature is pulled towards the coil, the contacts close, allowing the electrical current to flow from the power source to the motor. This energizes the motor connected to the contactor and the motor will start running. Conversely, when the current to the coil is interrupted, the magnetic field collapses, and the armature returns to its original position, opening the contacts and interrupting the current flow to the motor, and the motor will stop running. Here you can see two contactors are used both are the three-pole 440V contactor having four numbers auxiliary contacts.
Thermal Overload Relay
A thermal overload relay is a protective device used in electrical systems to prevent overheating of motors. It works by monitoring the current flowing through the circuit and detecting excessive current levels that could indicate an overload condition. Here, two thermal overload relays are used for this circuit both are the three-phase 440V relay having one NC and one NO contact.
Selector Switch
Here a single-pole three-position Selector switch is used in this circuit. This selective has three terminals '1', 'A1', and 'A2'. '1' is the common terminal. 'A1' and 'A2' are for output 1 and output 2.
Connection Procedure
If you see the connection diagram carefully, you can understand the whole connection diagram easily. All connections are shown properly in the above diagram. Just remember that the input phase terminal is to be connected to the '1' terminal of the selective switch. Then take an output from the 'A1' terminal and connect to the coil of the first contactor through the NC contacts of the overload relay as shown in the above figure. And take an output from the 'A2' terminal and connect to the coil of the second contactor through the NC contacts of the overload relay as shown in the above figure.
Working Principle
When the knob of the Selector switch is in the 'OFF' position both of the motors will be in the off condition. When you rotate the knob from the 'off' position to the '1' position then the coil of the first contactor will be energized and motor 1 will be turned on, and another motor (motor 2) will be in the off condition. When you rotate the knob to the '2' position then the coil of the second contactor will be energized, and motor 2 will be turned on, and another motor(motor 1) will be in the off condition.
Applications
This type of setup such as the Double motor control with a selector switch is commonly used in Water supply systems, irrigation systems, or industrial pump setups that may require the use of multiple pumps. A selector switch can be used to activate different pumps based on demand or operational requirements.
This type of arrangement is also used in industrial machinery where different motors need to be controlled based on specific tasks or operating modes. For example, in a manufacturing assembly line, the selector switch can be used to control motors for different stages of the production process.
They are also used in automotive applications such as in vehicles with adjustable seating or mirrors, a selector switch can be used to control the motors responsible for adjusting these features.
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Double Motor Control with Selector Switch Connection
Reviewed by Author
on
January 31, 2021
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Reviewed by Author
on
January 31, 2021
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