A relay timer is an electromechanical or electronic device that is used to control the timing of an event. It opens or closes contacts after a pre-determined amount of time has elapsed, thereby providing a timed control function.
Relay timers are used in a variety of applications, including industrial control circuits, security systems, burglar alarms and automated lighting control systems.
There are two main types of relay timers: electromechanical and electronic. Electromechanical relay timers use a mechanical timer mechanism to control the timing of the event. Electronic relay timers use an electronic timer circuit to control the timing of the event.
Electromechanical relay timers are less expensive than electronic relay timers, but they are also less accurate. Electronic relay timers are more accurate than electromechanical relay timers, but they are also more expensive.
Relay timers are an important part of many electrical and electronic systems. They are used to control the timing of a variety of events, and they can be used in a variety of applications.
Control of three phase induction motor using relay timer can be done in the following steps:
Connect the relay timer to the motor. The relay timer will have three terminals: power, input, and output. The power terminal is connected to the power supply. The input terminal is connected to the motor start button. The output terminal is connected to the motor contactor.
Set the relay timer for the desired time period. The relay timer will have a knob or dial that can be used to set the time period. The time period can be set in seconds, minutes, or hours.
Press the motor start button. The relay timer will start counting down. When the time period expires, the relay timer will close the contactor, which will start the motor.
Press the motor stop button. The relay timer will open the contactor, which will stop the motor.
Here are some additional tips for controlling three phase induction motor using relay timer:
Make sure that the relay timer is rated for the voltage and current of the motor.
Make sure that the relay timer is in good working condition.
Be careful not to touch the live wires.
If you are not comfortable working with electricity, hire a qualified electrician to install the relay timer for you.
Here are some of the advantages of using a relay timer to control a three phase induction motor:
The relay timer can be used to start and stop the motor automatically.
The relay timer can be used to control the motor speed.
The relay timer can be used to protect the motor from overload.
Here are some of the disadvantages of using a relay timer to control a three phase induction motor:
