Programmable two-channel cyclic time relay. UT24 Microprocessor time relay, two-channel

REV-201 and REV-201M

Electronic two-channel time relays with turn-on delay REV-201 and REV-201M are designed for switching AC and DC electrical networks with an adjustable time delay.

Electronic two-channel time relay with turn-on delay REV-201

REV-201 Designed for switching electrical circuits of alternating current 220 V/50 Hz and direct current 24-100 V with an adjustable time delay from 0 to 220 sec. The relay is two-channel. Each channel is an independent time relay. The time delay of each channel begins to count from the moment power is applied to the channel.

Relay REV-201 allows for two operating modes:

1. Independent operation of channels. Each channel is supplied with independent power at different times. The time delay is counted from the moment power is supplied to each channel (two relay mode);

2. Parallel operation of channels. Each channel is supplied with the same power simultaneously. The timing on both channels starts simultaneously. The response time corresponds to the delays set using adjustments for each channel (one relay mode with two different delays).

The range of time delay adjustments can be changed at the request of the customer. It is also possible to switch the relay into periodic on-off mode with user-adjustable on-off cycles. Parameters are specified additionally by customers.

CHARACTERISTICS OF OUTPUT CONTACTS OF TIME RELAY REV-201

TECHNICAL CHARACTERISTICS OF TIME RELAY REV-201

The range of time delay adjustments can be changed at the request of the customer. It is also possible to switch the relay into periodic on-off mode with user-adjustable on-off cycles. The parameters are specified additionally by the customer.

DISTINCTIVE FEATURES OF TIME RELAY REV-201

1. Availability of two independent channels.
2. Digital voltage signal processing.
3. Galvanically isolated relay power supply circuit with output circuits.
4. High accuracy of response time retention.
5. No dependence of the accuracy and quality of the relay on temperature, humidity and other environmental parameters.
6. Light indication of the start of the delay countdown (power supply) and relay operation.
7. Relay performance is maintained over a wide range of supply voltage changes.
8. No separate auxiliary power supply is required for the relay.
9. There is virtually no dependence on changes in network frequency.
10. Quite a large current switched by the output contacts.
11. Easy to set the response delay.
12. Possibility of changing the range of adjustable temporary settings at the request of the customer.
13. Two groups of output contacts, one for each channel, each having a break contact and a make contact.
14. Low power consumption under load.
15. Significant switching resource under load.
16. Mounting on a standard DIN rail.
17. Small size and light weight of the product.

WARRANTY

The manufacturer guarantees trouble-free operation TIME RELAY REV-201 within one year after the date of sale, provided:
-correct connection;
- integrity of the manufacturer’s quality control seal;
- integrity of the case, absence of signs of opening, cracks, chips, etc.

DOWNLOAD: Passport for time relay REV-201

Electronic multifunctional two-channel time relay REV-201M

Relay REV-201M designed for switching electrical circuits of alternating current 220V 50 Hz and direct current 24-100 V with an adjustable time delay from 0 to 36000 s.

Relay REV-201M contains two channels. Each channel can operate according to four operating algorithms specified by the user:

- relay with switching delay;
- impulse relay;
-periodic (cyclic) relay;
-control relay

(The REV-201M relay can be used as a pre-start alarm relay for equipment subject to the “Unified Safety Rules...” of Gosgortekhnadzor, regarding the safe operation of technical devices, including for mining and processing plants (mining and processing plants).

Mode 1. Independent operation of channels. Each channel is supplied with independent power at different times. The time delay is counted from the moment power is supplied to each channel (two relay mode);

Mode 2. Parallel operation of channels. Each channel is supplied with the same power simultaneously. The timing on both channels starts simultaneously. The response time corresponds to the delays set using adjustments for each channel (one relay mode with two outputs and different delay times).

SPECIFICATIONS REV-201M

Electronic two-channel time relay REV-201 (GOK)

The electronic two-channel time relay is one of the modifications of the standard REV-201.

This relay modification is intended for the system pre-alarm technological equipment of mining and processing plants (mining and processing plants).

The relay is two-channel: after power is applied, it provides different operating logic for the two output channels. The operating algorithm is “start - pause - start”.

Relay REV-201, REV-201M replace time relay type VL (Ukrainian production)

You can buy relays REV-201 and REV-201M from SAVEL LLC:

I present to your attention a cyclic two-channel time relay. The device is designed for cyclic (infinite) counting of two independent time delays (work and pause). The device is based on a microcontroller, channels are switched by triacs, mains power, transformerless. The device provides counting of two independent time delays from 1 to 999 seconds, or from 1 to 999 minutes, depending on the microcontroller firmware version.

This device is amateurish and cannot in any way replace industrial analogues that have greater functionality, reliability and safety. The only advantage of this device is its low cost. The relay is assembled practically on its own, does not contain scarce parts, is easy to configure, and is quite universal in use. Can be used in ventilation, heating and lighting systems for small critical objects, and in any other cases requiring cyclic timing of time delays. The idea is not original; an industrial multifunctional relay was taken as a basis and converted to the required functionality.

If it is necessary to use such a relay in serious projects, I recommend taking certified industrial samples. In any case, the end user is responsible for use and possible damages.

At the same time, the relays I made showed themselves to be quite efficient and reliable.

Scheme and description of the design.

Attention! Risk of electric shock! The device is made according to a transformerless circuit with a quenching capacitor! All conductors are galvanically connected to the network!

For greater safety, if necessary, you can power the device from any power supply with a voltage of 5 volts and a current of at least 150 mA.

In my version, access to the board is denied to an unqualified user, which is why transformerless power supply was chosen.

The quenching capacitor limits the current, which is rectified by the diodes, then the zener diode VD4 limits the voltage at 5.1 volts. Electrolytic capacitors smooth out rectified voltage ripples, while ceramic capacitors filter high-frequency interference. The relay is based on an Attiny 24 microcontroller; through a 74ns595 shift register and transistors Q3, Q4, Q5, information is displayed on a seven-segment three-digit indicator. Triacs T1, T2 are controlled through transistors Q1, Q2. The device is configured using two tact buttons S2, S3. LED D3 counts second pulses.

Details

The device does not contain critical or scarce parts, but there are some nuances associated with the use of a quenching capacitor. The main requirement for parts in the high-voltage part of the device is the ability to withstand voltage surges occurring in the network. Therefore, the quenching capacitor C3 must have a voltage of at least 400 volts, and preferably 630 volts. The same applies to RC capacitors of chains C11 and C12. Resistors of RC circuits of triacs are at least one-watt, it is advisable to use ceramic ones. The resistor limiting the current and serving as a fuse is R19, its value can be from 10 to 47 ohms. It must also be ceramic, with a power of 1 watt or more. Depending on the load and the type of triac used, it may be necessary to install radiators. The printed circuit board is designed so that the triacs are on the edge and can easily be screwed to the radiators. The triacs are controlled in the third quadrant (negative voltage). It will not be possible to use domestic triacs Ku208, Ts122 Ts132 and the like, they are not controlled in this way.

Zener diode 5.1 volt, I used BZX85C5V1, any similar one with a power of 1W or more will do. Electrolytes for voltages of 25 volts and higher.

Buttons S2, S3 are regular tact buttons; to prevent accidental touching of adjacent parts when pressing the button, it is advisable to use buttons with a high pusher.

The disadvantages of circuits with a quenching capacitor, in addition to the danger of electric shock, include a small current output. Therefore, you have to limit consumption or install a larger capacitor. The greatest current in the device is consumed by the seven-segment indicator and triacs. Therefore, it is advisable to use triacs with a small control current, otherwise under-opening is possible. The VT139-600 shown in the diagram just satisfy this condition; there were no problems with them. It is also advisable to use transistors with high gain. In my version, these are KT3107 and KT3102, they work in key mode and are completely replaceable with similar ones. The current through the seven-segment indicator is limited by resistors with a nominal value of 470 ohms, the brightness of the glow is quite sufficient for indoor use.

The microcontroller is used in a planar package; it can be replaced with a PDIP that is more convenient to install, but you will have to re-install the board for another case. The pin assignments for the PDIP and SOIC packages are the same. Register 74NS595 is replaced by functional analogues from other companies. Red LED, common cathode, fully marked E30361-I-O-O-W, widely distributed and available. It may be under a different label, keeping the numbers 3610 in it; a link to its datasheet is attached at the end of the article.

Management and work

There are two options for firmware of the microcontroller, for second and minute counts. Archived files tiny24_soic_min.hex And tiny24_soic_sek.hex respectively.

When turned on, the specified time delay values ​​are read from the non-volatile memory of the microcontroller, triac T1 opens, and time counting begins. After the specified shutter speed, T1 closes, T2 opens and the countdown of the second shutter speed begins. Then the process is repeated cyclically. When turned off, the work will start from the beginning, the state at the time of shutdown is not remembered. Depending on the application, you may not need to install single channel parts and use the relay in single channel mode, for example to control a single pump or fan.

The default shutter speeds are 10 and 15 minutes or seconds. In operation, the indicator displays the time until the end of the on state, in the form of a countdown. A short press on the S2 button in operating mode resets the current reading and switches channels, this is convenient to use to force the desired channel to turn on and check the connected equipment.

To enter the setup mode, you need to long press the S3 button. The device will enter setup mode. In this mode, you can cyclically change the value of units, tens, and hundreds of a given time delay. The place of familiarity that is active for change is indicated by a decimal point. By pressing the S2 button, we increment the value from 0 to 9, in a circle, using the S3 button, we switch the active values ​​of the time delay settings.

The algorithm is as follows: pressing S3 - units of exposure 1, pressing S3 - tens of exposure 1, pressing S3 - hundreds of exposure 1, pressing S3 - units of exposure 2, pressing S3 - tens of exposure 2, pressing S3 - hundreds of exposure 2, pressing S3 - adjusting the timer, pressing S3 – exits to operating mode and writes values ​​to memory.

If you do not scroll all the values ​​to the end, no recording will occur and after 5 seconds the device will return to operating mode without saving the changed settings.

The last press of S3 will display the value of the microcontroller clock frequency adjustment register, OSCCAL if desired, it can be changed by pressing S2 - the values ​​​​will change upward by one, in the range from 60 to 160, in a circle. You can control the frequency of the system timer using the HL1 LED, the frequency of its flashes and pauses is 1 second, that is, a meander with a period of 2 seconds. I don’t see much point in adjusting, since this frequency will float, depending on the temperature and supply voltage. But for perfectionists, adjustments are provided. You need to understand that the longer the time delay, the greater the error, and you should not expect ultra-precision from the device; for this you need other relays, with a real-time clock.

If desired, you can record excerpts at the programming stage; to do this, you need to enter the following decimal values ​​by address into the EEPROM.

Printed circuit board

The circuit and printed circuit board were developed in the program; the attached file contains a project file.

All parts are installed on the board for ease of installation and elimination of unnecessary wires. The case was not developed; the dimensions of the board are 80x80mm and are made to fit a standard junction box of 85x85x35 mm. The box is installed in a convenient location, the device is configured, and no further access to the device is required. If necessary, you can remove the indicator and buttons on the cable. It is advisable to cover the board with insulating varnish. The device is connected either through a terminal block, which is convenient, or by soldering the conductors into the board, which is more reliable.

The microcontroller is programmed already sealed into the board. For this purpose, the board has holes for pins for connecting the programmer. The simplest and most accessible programmer was used" five wires", under the control of the no less popular program " ".

The fuses for this program are shown in the picture below.

Fuse turned on - fuse without a tick!

Only the fuses responsible for the power control mode and watchdog timer change; it is very advisable to switch them, because otherwise the MK may freeze.

The attached file contains a diagram and a printed circuit board in the form of image files of several formats, a DipTrace project, and two firmware files for a second or minute countdown.

Sources of information and literature.

1. datasheet for the indicator - http://jumperone.com/doc/datasheets/E30361.pdf

2. prototype -http://kazus.ru/forums/showthread.php?t=14061

4. A.V. Evstifeev. "AVR microcontrollers of the Tiny and Mega families by ATMEL"

List of radioelements

ARIES UT24 is designed for automatic control of actuators in various technological equipment using an arbitrary sequence of pulses.

Allows you to organize the start and stop of equipment, control up to 30 different time processes.

Programmable two-channel timer UT24 ARIES is produced in 4 types of enclosures: wall-mounted and panel-mounted Shch1 Shch2 Din-rack.

Basic functions of a time relay

• Programming using buttons on the front panel of the device;
• Protection of parameters from unauthorized access;
• Connect three external devices to start, stop, temporarily block or reset the timer program;
• Six timer restart modes;
• Two programs of a finite or infinite number of cycles of 1...30 steps (each step specifies the on/off switching of the actuator);
• Indication of time, number of cycles or number of steps remaining until the end of the program;
• Two independent timers for the formation of two independent programs for controlling actuators;
• Saving the current values ​​of program parameters when the power is turned off.

Functional diagram of the UT 24 device

External input signals of time relay OWEN UT 24

Programmable timer ARIES UT24 has 3 inputs for connecting external device control signals. The following can be connected to the inputs:

• elements or devices that have a “dry” contact (buttons, switches, reed switches, relays, etc.);
• active sensors having an n-p-n-type transistor with an open collector output at the output; to power the sensors, the supply voltage +24…30 V is supplied to the device terminal block;
• other types of sensors with a high-level output voltage not exceeding +30 V, and a low-level voltage not exceeding 0.8 V. The input current at a low-level voltage at the device input of 0 V does not exceed 15 mA.

Time relay input selector OWEN UT 24

The input selector determines the assignment of the inputs in relation to the timers.

Timer control signals ARIES UT24

Each timer has 4 control signals: “Start”, “Stop”, “Block” and “Reset”.

The “Start” pulse starts the execution of the program from the beginning or from where it stopped.

Pulse duration is not less than 0.1 ms.

The active "Stop" level stops the ARIES timer. The program execution is resumed from the stopping point when the “Start” signal is received and in the absence of an active “Stop” level.

The active level “Blocking” stops the execution of the program for the duration of its presence. After removing it, the program resumes work from where it stopped.

The Reset pulse stops the program and returns it to the beginning.

Operation of UT24 ARIES timers. Formation of a program for the microprocessor relay UT 24

The UT24 ARIES time relay includes two independent timers, for each of which the user can set his own pulse generation program.

The program is a sequence of pulses (cycles) repeated a specified number of times. The number of cycles is determined by the user. You can set either a limited number of repetitions from 1 to 9999 or an infinite number.

A cycle consists of a set of steps, for each of which a pulse duration and a pause duration are specified. A cycle can contain from 1 to 30 steps.

Job ARIES timer programs illustrated in the diagram.

Output devices

Time relay ARIES UT24 has two identical output devices (OU) for controlling actuators. The control signals of the control unit are galvanically isolated from the device circuit.

Output devices can be:

• e/m relay;
• optotransistor switches;
• optosimistors.

The signal from the output of the 2nd timer is duplicated by a transistor optocoupler with an open collector.

The type of output device is selected by the user when ordering.

Power control of the timer UT 24 ARIES

The device provides supply voltage control, thanks to which, in the event of its “emergency” loss or “failure” below 160 V, the current values ​​of the parameters of the program being executed are recorded in the non-volatile memory of the device.

After the normal supply voltage level is restored, the device turns on and the stored values ​​are retrieved from memory.

This function can be omitted, which is specified in the init parameter.

Technical characteristics of the two-channel relay UT24

Programmable relay connection diagrams

Designations when ordering ARIES UT24