- Cyclic
- Intermediate
- Electromagnetic
- Pneumatic
- Motor
- With hour or anchor mechanism
- Electronic
Cyclic
Circuit-type devices generate output signals after the set time interval. Originally it was a mechanical product that interacts with contacts through a programmable mechanical drum. With the advent of microprocessors, it became possible to create units with a huge range of parameters. This type is widely used in automation systems to turn on and off all kinds of mechanisms.
Example of .The daily household timer controls the illumination of the aquarium, terrarium, greenhouse, feeders, waterers. Most often, time relays are used to control street lighting in a private area.
In systems, a smart house, the timer plays the main role of providing comfort. At a given time, turns on and off the heating, light, can output a reminder of the event. Boil water in the kettle in the morning, turn on the laundry and so on. Timer service is carried out in medicine, science, robotics and other branches of human life.
Intermediate
Intermediate time relays are installed in mechanisms that need a signal delay at a specific time. They in turn are divided into subtypes:
- electromagnetic;
- pneumatic;
- motor;
- with hour or anchor mechanism;
- electronic.
Consider the device and purpose of each species.
Electromagnetic
Used in DC circuits, where a short-circuited turn is added to the coil of the device and a delay in releasing contacts or closing occurs due to the residual field. Limits of regulation up to 5 seconds.
Most often such time relays are used in control circuits of acceleration and braking of the drive.
Pneumatic
This type is equipped with a special pneumatic dampener or diaphragm, the adjustment is made by changing the size of the air hole. After the signal arrives, the anchor pulls the piston, but it can not do this instantly while the air is in the damper. The adjustable opening defines the response time. Adjustment is possible up to 60 seconds.
Pneumatic time relays are often used to automatically control equipment, for example, with a metal cutting machine. In addition, pneumatic relays have found their application in drive control circuits for step control, acceleration and braking.
Motor
The heart of the device is a synchronous motor, running from a variable network of 50 Hz. A complex mechanical device with the ability to set the delay from a few seconds to tens of hours.
Time motor relays, in fact, as well as anchor ones, can be used in protection circuits of overhead lines for re-activation.
With hour or anchor mechanism
Powered by a sprung spring. Electromagnet winds the spring, the device starts working( the principle of a clockwork toy) and closes the contacts. The range of the relay is 0.1-20 sec.
We have already told a little bit about what they are needed for.
Electronic
Extensive family of analog and digital electronic devices using physical processes in electronic circuits, charge or discharge of a capacitor, counting of a certain number of pulses.
With the help of an electronic type relay, you can save a lot at home, for example, take light in the corridor, storage room or porch. By pressing the button we turn on the light. After a certain time, he turns off, this period should be enough to search for an item in the corridor, pantry or getting into the apartment. Light without need is not lit, forgetfulness left switched on.
It is easy to see what kind of time relay and what principle of operation each type of performance has, you can on the video below:
That's all I wanted to tell you about the features of using different types of time relays. Now you know what kinds of timers are and how they work.
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