The present invention relates to automation, in particular to devices for monitoring and control of process parameters, and can be used as a positioner for actuators with position sensors, automatic control systems of technological processes, and also as a controller in control systems with a small time lag.

A device for monitoring and control of process parameters [1], comprising a three-position relay output indicators for the upper and lower limits of tolerance, the sensor setting, unit setting, the first and second Adjuster dead-band three-position relay, analog switch, two LEDs, the driver signals, rectifier, amplifier, logic and actuator. The disadvantage of this device [1] are its complexity, low accuracy and speed,

It is known device [2], containing three-position relay output indicators for the upper and lower limits of tolerance, the sensor parameter Adjuster setpoint, the first and second Adjuster dead-band three-position relay, analog switch, two driver signals, the first and second amplifiers, logic circuit and the actuator. The disadvantage of the us the device [2] is its difficulty, low accuracy and speed.

The closest in technical essence and the achieved effect is the prototype of the proposed device is the device [1].

The task of the invention is to improve the accuracy and speed of positioning of the actuator and simplified device for positioning.

1 shows a block diagram of a device that implements the proposed method of positioning the actuator, figure 2 is an example implementation of a three-position relay, figure 3 is a graphical depiction illustrating the method of positioning the actuator.

On the Figures shown:

1 - unit Setpoint,

2 - unit permanent part of the dead zone - the Zone T,

3 - sensor Option - P,

4 - three-position relay

5 - unit variable part of the dead zone Zone P,

6 is a logical element ILI,

7 - power supply

8 - reversing contactor [3],

9 - actuator

10, 11 Comparators,

12-21 resistors,

U22 - coordinate analog voltage,

t23 - time coordinate,

P signal Parameter

U - Setpoint,

The T-26 is a permanent part of the dead zone,the

The T-27 - the variable part of the dead zone.

The essence of the proposed method is positionierung actuator is what deadband three-position relay is divided into variable and constant parts. This experimentally determine the amount of change of the parameter for the acceleration of the actuator Area R, which is set as the variable portion of the dead zone position relay and during braking actuator Area T, which is established as a permanent dead zone trichlorsilane relay. The variable part of the dead zone has two values - 0 or R depending on the signal received at the input unit of the variable zone. To install the actuator to a predetermined position on the inputs of the three-position relay connect the signals of the Parameter Setting, the signals of constant and variable parts of the dead zone, and outputs the More and Less connected to the same inputs of the reversing contactor [3], and the position of the actuator set by the unit signal Setpoint by changing an amount exceeding the amount of signal modules of constant and variable parts of the dead zone, and the signal of the variable part of the dead zone is reduced to zero, while achieving the difference signal Parameter and the Setpoint is equal to or less modulo a constant part of the dead zone thermostat is on the relay, the variable portion of the zone acousticelectric to increase the signal magnitude Area R.

The acceleration of the actuator is considered from the point of activation of the actuator reaches its rated speed, and the deceleration time from the moment of switching off the actuator to its full stop.

A device that implements the proposed method of positioning the actuator, the novelty of which consists in that the device entered the unit variable dead-band three-position relay logical element ILI and new relationships between its elements, providing automatic shutdown of the variable part of the dead zone in excess of the difference between the Setpoint and Parameter values of the sums of models of fixed and variable parts of the zone acoustically and increase a variable dead zone on the magnitude of the signal Area P if the difference between Setpoint and Parameter equal to or less module a permanent part of the dead zone.

A device that implements the proposed method works as follows. When the value of the signals P->Area T+Area R, the output is Less than three-position relay 4 there is high potential that connects through a reversing contactor 8 power supply 7 to the actuator is 9, that being associated with the sensor Option 3 reduces the value of the signal P and the signal at the output of logic element 6 changes from high potential to low and the output signal of unit 5 Area R becomes zero. When the Setting conditions are P=I+T, the outputs of the Smaller becomes low and the power supply 7 is turned off reversing contactor 8 of the actuator 9, but the Parameter continues to decrease under the action of the connection of the actuator with the sensor Parameter 3 value Sonat and stopping the actuator signal Parameter becomes equal to the Setpoint, and the output of logic element ILI NOT simultaneously with deactivation of the actuator there is high potential that is supplied to the input unit 5, and its output signal Area R, which increases the dead zone position relay on this value as for positive and negative mismatches between the parameter and the Setpoint.

For negative mismatches between the signal Parameter and the set point, i.e. when the condition of the U-P>Area T+Area R signal, the Area R specified by the output signal of the logic circuit 6, is reduced to zero and the More there is high potential that connects the power source 7 through aversives contactor 8 to the actuator 9, and signal parameter increases until, until you run condition U-P=T, at which the high potential output More three-position relay goes to the low level signal and the actuator 9 via the reversing contactor 8 is disconnected from the source 7, but the signal P Parameter continues to increase on the value of T and is equal to the Setpoint, the output of the logic circuit 6 receives the high potential to the input of the power supply unit 5 and the value of the dead zone of the three-position relay is increased by the magnitude of the signal Area P at the output of the generator 5 connected to the respective elements of the three-position relay.

Three-position relay figure 2 contains the Comparators 10 and 11, summing, inverting and noninverting inputs are connected to summing resistors 12-21. The first contacts of the resistors 12 and 19 are connected to a common potential three-position relay and the second contact - to reinvestiruet inputs of the Comparators 10 and 11, respectively, the first contacts of the resistors 13 and 17 are combined and connected to the signal generator Setpoint, and the latter have their contacts connected respectively to the not inverting input of the comparator 10 and the inverting input of the comparator 11, the resistors 14 and 18 of the consolidated first inputs connected to the signal Parameter and the second input data is t to the inverting input of comparator 10 and not inverting input of the comparator 11, respectively, resistors 15 and 16 of the consolidated first inputs connected to the signal Zone T and second input resistors 15 and 16 connected to the inverting inputs of the Comparators 10 and 11, respectively, and further introduced into the unit resistors 20 and 21 of the consolidated first inputs connected to the signal Area R and the second their outputs connected to the inverting inputs of the Comparators 10 and 11, respectively, similarly summing resistors 15 and 16.

Three-position relay figure 2 provides a comparison signal Parameter and the Setpoint and the width of the dead zone is set by the signals of the sensors Zone T and Zone R and is equal to the sum of these signals for positive and negative signals of the error Parameter and the Setpoint and provides the following functions:

- Formation of a logical high signal on output is Smaller under the condition P>+T+Area R.

- Formation of a logical low level signal at the output is Less, provided P<Y+T+Area R.

- Formation of a logical high signal at the output is Greater, provided The>P+Area of the P+Area So

- Formation of a logical low level signal at the output is Greater, provided The<P+Area of the P+Area So

Figure 3 shows the change in the position of the actuator, uniquely corresponding to the signal change Parameter 24, when the signal change Mouth is key 25, to which hardware method in three-position relay tied signals knobs the T-26 and Area P 27.

Thus, the proposed method of positioning the actuator and device for its implementation provide the most accurate positioning of the actuator corresponding to the Setpoint, the maximum speed positioning and obvious simplification of the device compared to the prototype. The proposed device is new, useful, industrially applicable and meets the criteria of the invention.

Literature.

1. RF patent 1742789, G 05 B 23/02, BI No. 23, 23.06.92.

2. RF patent 20286541, G 05 B 23/02, BI No. 4, 09.02.95.

3. Information materials of the company Danfoss, Reversing contactor, type RCI.

The method of positioning the actuator through a three-position relay with dead zone, the inputs connected to the target setpoint, the sensor parameter, target dead-band, and outputs “More” and “Less” to the same control inputs of the reversing contactor to the input of which is connected to the power source and to the output of the actuator, namely, that experimentally determine the change in the value of the signal parameter for the acceleration and deceleration of the actuator, the deadband is repositioning relays are divided into variable and constant parts, which set as the change in the value of the signal parameter, respectively, for the acceleration and deceleration of the actuator, and a positioning actuator carried out by changing the setpoint to the desired value while reducing the variable part of the dead zone to zero, and when the difference signal parameter and setpoint module value of the constant part of the dead zone, the actuator off and simultaneously increase the deadband on the value of its variable part.