Where used and why microprocessor relays?
What we have known microprocessor-based relays Relays come in different type, relay to control any process and electrical events. Relay analyzers of the presence of phases in the supply chain. Time relay with possibility to perform tied to time intervals. As relays of temperature, pressure etc. of the Relay at this time is not just a piece of wire and coil with contacts, it is a real microprocessor. The use of different types of relays are justified in practice. Earlier possible that you could solve using mechanical principles, now everything has become smaller and the same tasks laid on electronics.
in order to understand the problem, let us compare a couple of devices. If you go out so that devices with better mechanics will cope with its responsibilities, then why not visit them in this case But actually everything is very specific, and in each case, you need to question the use of relay types to be taken judiciously after reviewing all third-party factors. The relay essentially, it is a conditional change-over contact. Contact can be mechanically implemented (contactor, relay lamellae), and can be implemented using (thyristor, triac, transistor logic).
let us Start the search for differences.
Can I analog devices programming Yes you can, but everything happens in a narrow range as a rule that is laid at the production level. What is the circuit switching without third-party equipment are difficult to gather. The accuracy of the parameters is low and the resolution settings high. Moreover, the analog device does not track usually more than two or even one parameter, and if there is some sort of program, then it is implemented at the very simplest level. An example of a programmable relay with the drum and with reference to the number of rotations of the drum. This device was used in the 70s when he collected the plants of Germany washing machine. In domestic systems, too, have counterparts, there is a time relay RVO-P2-U-08, which stands at the bakeries for a long time and adjust the baking time in the aisles from 0.1 seconds to 99 hours. In any case, the discreteness high. If we put the interval in the day, the process that will be monitored will have to change every hour. Basically this relay is used for switching on and switching off the heating in the furnace. Analog relay all the plants are equipped with to this day, only those who are adopting new technologies and are willing to invest a lot of money, those are different, the most perfect equipment. Analog relays are different - photoelectric, thermal relays, time relays, voltage, etc.
the Difference of microprocessor relays is based on the principles of application of microprocessors. There is a small chip that has a memory which stores an instruction to work and the output device, and input. In fact, even if in the chain will not be long voltage, the program processor of the relay will not go astray, because everything is based on non-volatile memory. Non-volatile memory is the flash drive. If no reference voltage, then this is a big plus for stability in systems automation. I like microprocessor relays manufacturer Schneider electric, but recently began to pay much and Russian developments. For example NPTS "Action-Health produces a wide range of this type relays. One of the widely used relay this relay time RV-01-02, it is already integrated Atmel microcontroller type. The controller Atmega 8A-AU consists of a single chip integrated processor, a timer and a flash memory, and all tied to the device input and output. The flash drive is only 8Kb, but for storing program listing this is enough. A programmer can write a fairly wide range of programs to perform this controller, all that will be flooded as the firmware in the device, will remain in there until the next rewrite. The power-on reset does not reset the firmware.
All that is in memory is an array of commands that is entered by the programmer and special firmware that works with this array according to a specific algorithm. From what firmware and what are its features, is judged on the device as a whole. In some devices the programmer need or mechanically using a set of input buttons to enter something. Time relay RV-01-02 is able to perform in different sequences to 80 different time intervals in the operating cycle. You can specify the number of cycles from 1 to 99 or to put the implementation in a circle, everything will work until the supply voltage is, how it disappears, and everything stops. The discreteness of such relays on the whole interval from 1 sec to 99 hours is not more than 1 second. You can create a program and the temperature with pastries on the hour every half hour, or as otherwise, everything is programmed in accordance with the manufacturing cycle. This relay can not only tie on the stove, but pumping equipment is linked with the pressure valve. In any case, the pump will pump, but when the pressure reaches the limit, it will stand. The intervals of its inclusion are programmed in the relay.
Anyone who is interested in this unique relay RV-01-02, I think we should talk about its functionality. In the passport there is little you are reading, there is only a description of each button in each item in the special menu and nothing more. The essence is that the device does not control the time, he only tied to time and on his scale at a certain stage that enables or disables. The program can be started only at certain times or under certain conditions. When the cycle runs, the program proceeds to the start position and waits for a new impetus to perform. Recently this relay put on one bakery with reference to the valves supplying steam to the oven, where bread fits. Very smartly works, to train it staff was just. Binding was carried out to temperature and humidity. If the temperature reaches a maximum, it is reset steam, if humidity drops, the valve is opened. Simple and tasteful works like a normal PID controller.
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