A time relay is necessary to control the power circuits of the electric motor and provide protection against short circuits. The device allows you to precisely adjust the response time of the devices in accordance with the needs of production.
On the basis of special microcircuits, you can make a time relay yourself. Such devices are applicable in everyday life to adjust the operating time of the washing machine or when debugging the period of heating the food in the microwave.
With the help of a timer, programming is included to turn on or off automation, lighting, and the work of machines is also controlled. The electronic device includes a voltage stabilizer, a time setting generator, a control apparatus, an input signal amplifier, and a relay element. There are several types of device data.
Modern production sells devices with electromagnetic deceleration. This type is used when working on direct current, it holds the response time in the range from 0.07 to 0.11 sec. If the device is designed to turn off the device, then the time can be set within 0.5 - 1.4 seconds.
Relays with pneumatic retardation are performed with an air damper and cataract. This device is able to provide a time delay in the range from 0.4 - 180 seconds. In this case, the accuracy of operation will be no more than 10% of the indicated setpoint.
Even a mechanical time switch is programmable. Therefore, the operation of any type of device depends on how the technician debugs the response mechanism. Anchor types of devices operate on the basis of the action of the spring, the position of which is debugged depending on the setting. After counting the set time, the device changes the position of the contacts. Using the anchor relay, you can change the response value in the range from 0.1 to 20 seconds. Moreover, the accuracy of the device is approximately the same as that of a relay with pneumatic deceleration (equal to 10% of the setting).
In modern production, motor timers are used. They include a gearbox, an alternating current motor, an electromagnet and copper contacts. If a signal exceeding the setpoint is received at the input of the device, then the electromagnet couples the gearbox to the motor and the contacts transfer. If a fixed value disappears at the input of the time relay, then the electromagnet returns to its original position and disengages the gearbox and motor. The time of the motor performance device can be adjusted from 10 seconds to 3 hours.
Electronic time relays operate on the principle of an active-capacitive circuit, while being quite reliable and accurate. This is the best solution to the problem!
All time relays are used for endurance during the implementation of complex protection at substations and domestic switchgears. With the help of such devices, false triggering of automation and its signaling is eliminated. Thus, high clarity is achieved in the operation of the equipment.
Today, factories use microprocessor devices with a time delay. Each unit of such a device is responsible for a separate production line, while in the complex of the unit not only relays are implemented, but also ordinary contactors and switches. This approach allows us to simplify the circuit and make it more maintainable.