The time relay is necessary for controlling the powermotor circuits and protection against short circuits. The device allows you to accurately adjust the response time of devices in accordance with the needs of production.
On the basis of special microcircuits it is possible to executetime relay with their own hands. Such devices are applicable in everyday life for adjusting the operating time of the washing machine or for debugging the heating period of food in the microwave oven.
With the help of a time relayprogramming the activation or deactivation of automation, lighting, as well as the operation of machines. The electronic device includes a voltage regulator, a time set generator, a control device, an input signal amplifier, a relay element. There are several types of these devices.
Modern production of instruments withelectromagnetic deceleration. This type is used when operating on DC, delays the response time in the range from 0.07 to 0.11 seconds. If the device is designed to turn off the device, the time can be set within 0.5 - 1.4 seconds.
Even a mechanical time relay is programmable.Therefore, the operation of any kind of device depends on how the technician debugs the triggering mechanism. Anchor types of devices function on the basis of the action of a spring, the position of which is adjusted depending on the set point. After reading the set time, the device changes the position of the contacts. With the help of an anchor relay it is possible to change the pickup value in the range from 0.1 to 20 seconds. The accuracy of the device is approximately the same as for a relay with pneumatic deceleration (equal to 10% of the set point).
In modern production, motortime relay. They include a reducer, an alternating current motor, an electromagnet and copper contacts. If the input of the device receives a signal exceeding the setpoint, the electromagnet couples the gearbox with the motor and the contacts are reset. If a fixed value disappears at the input of the time relay, the electromagnet returns to its original position and disengages the gear and motor. The time of the motor performance meter can be adjusted from 10 seconds to 3 hours.
Electronic time relays operate on the principle of active-capacitive circuit, while they are quite reliable and accurate. This is the best solution!
All time relays are used for holdingimplementation of complex protection in substations and households. With the help of such devices, a false alarm of the automation and its signaling is excluded. Thus, high clarity in the operation of the equipment is achieved.
Today in factories and factoriesmicroprocessor devices with time delay. Each unit of this device is responsible for a separate production line, while not only the relay, but also conventional contactors and switches are implemented in the complex of the unit. This approach allows you to simplify the scheme and make it more repairable.
