SU1499325A1 - Method and apparatus for shaping commands for revolutions drelay - Google Patents

Abstract

The invention relates to the field of energy and is intended to set the mode of operation of the power unit in the process of changing the frequency of its rotation and protection against abnormal modes. The purpose of the invention is to increase reliability and enhance functionality. The method of forming relay commands includes converting the shaft rotational speed to a sequence of signal pulses proportional to it in frequency, summing these pulses in the pulse counter, comparing the current value of the result of the summation with the set rotational speed, forming the beginning of the inhibit pulse in duration, simultaneously stopping for the duration impulse impulse is the summation of the signal impulses and memorize the result of the summation achieved by the moment of the of the inhibit impulse, memorize it, and then stop comparing the correspondence of the current value of the result of the summation to the setpoint value of the rotational frequency, completing the formation of the impulse by duration, and the fact that the inhibit impulse is memorized is the beginning of the process of developing relay commands, then the summation of the signal pulses continues measuring cycle, and the results of memorization are periodically canceled, as is the result of summation. 2 sec. and 1 z.p. f-ly, 2 ill.

Description

l, diodes 13, relay power supply source 14, relay command disable unit 15, output buses 16, connected to other contacts of each relay 10 (other contacts of relay 10 are not shown in the diagram),

The device operates as follows

,

A rotational frequency converter converts the frequency of rotation of shaft 1 into a sequence of pulses whose frequency is proportional to the frequency of rotation of the shaft I. These pulses are fed to the counting input of the counter 5 signal pulses. With an increase in the angular velocity of rotation of the shaft G to its set value, the corresponding bit outputs of counter 5 establish logic level 1 levels, as a result of which the output of that element 8, whose inputs are connected to this bit code, sets a signal with logic level 1, which through the element OR 9 will go to the V-input of counter 5, as a result of which the latter will remain set to the removal of this signal, as well as to the input of its relay 12o. After forming and memorizing the command signal, as a result ate which contacts 11 are closed, the output from the OR element 9 the blocking signal is removed and the device again goes into operating mode.

The device can also be implemented on elements in the inverse basis, as illustrated by the example of a variant of the installation channel (Fig. 2). In this circuit, the element 8 also provides for the inversion of the output signal, which increases its load capacity and allows the control winding of the relay 10 directly connected to the output of this element, which shunts the device, thus increasing the circuit of the device. The use of a triggered polarized relay as a relay prevents the generation of spurious commands in the event of a power failure, and the presence of a punctured bore protective diode 13, which the disconnection command relay 15 is connected to, expands the functionality of the device.

Consider the operation of the device on the example of the option of performing the setting channel (),

When the angular rate of rotation of the energy unit reaches a setting value, all inputs of the corresponding element AND 8 are set to logical 1, whereby the output of this element will be a logical signal O, which will cause current to flow through the control winding of relay 10 and simultaneously is a pulse, prohibiting the operation of the counter on the V-input, to the bit outputs of which. The inputs of this element are connected; Since the active signal of the AND 8 element is the logic level O, then the AND element, the number of inputs of which are not less than the number of setting channels, can be used as the element OR 9 playing the role of the logical adder of active signals three are shown), the logic level O at the output of the element And 8 will be due to blocking by this level, the counter 5 is held until the relay 10 is activated, and its contacts 11 are closed, after which the current flow through the control winding of this relay stops,it increases the cost efficiency of the power supply, and the inhibit signal is removed from the element ID 9 and the device switches to the rotation frequency control mode of the unit, when it decreases to the value corresponding to the disconnection of the relay command, current will be supplied from the block 15 to the breakdown winding of the relay 10, which sets the initial state, and the installation channel will switch to the control mode when the angular velocity of rotation is reached. meanings

Claims (1)

Invention Formula 1 o A method of generating the rpm relay commands, including converting the shaft rotational speed into a sequence of signal pulses proportional to it in frequency, summing these pulses in a given period of the measuring cycle, comparing the current value of the result of the summation with the set value of the rotation frequency, developing the relay command and 514 its memorization, periodic annihilation of the results of the summation in a given period of time of the measuring cycle is also distinguished by the fact that, in order to increase reliability, after the value of the result of summing the signal impulses corresponding to the set rotational frequency is reached, the prohibition impulse is formed over the duration, at the same time, the summation of the signal pulses is stopped for the duration of the duration of the inhibit impulse and the summation of the resultant signal when the inhibit impulse is generated, it is remembered, after which the matching process is terminated, the actual value of the result of the summation to the set value of the frequency of the crash, completing the impulse formation by duration, and the fact that the inhibit impulse is memorized is the beginning of the development of the relay command, then the summation specified time period of the measuring cycle, and the results of memorization periodically cancel g 3 6 2 o A device for implementing a method of generating a revolution relay command, comprising a pulse frequency converter connected to a counting input of a counting signal pulses, the outputs of which are; through a decoder consisting of separate AND elements, connected to the windings. corresponding relays, and a timer, the output of which is connected to the output terminal of the counter of signal pulses, characterized in that the outputs of the individual AND elements of the decoder are connected via OR element to the V input of the counter signal pulses17 each of the individual elements of the AND of the descrambler has an additional input, which through a normally open contact group of its relay is connected to a source of logical I Zo The device according to P2, which is designed so that, in order to expand its functionality, each relay is polarized with a trigger characteristic and a relay command disconnecting unit is connected to the perforator winding of each relay five.