SU1273886A1 - Device for checking control system of electric drive - Google Patents

Abstract

The invention relates to automatic control and monitoring systems and can be used in technological objects. The purpose of the invention is to increase the number of monitored units of the electric drive control system by obtaining additional diagnostic data using the inputted electrical circuits, as well as by creating a cut-off circuit for the supply voltage of the electric drive control system that was disconnected. The device is equipped with means of indicating the totality of possible faults with S and each fault separately. 2 Il. (L

Description

N3

WITH

00 00 05 The invention relates to automatic control and monitoring systems and can be used in process automation facilities. The purpose of the invention is to increase the number of controlled units of the electric drive control system. The essence of the invention is that, with the help of electric circuits, additional diagnostic data is obtained and a power supply circuit is disconnected from the drive unit of the control system. Fig. 1 shows a block diagram of the device, Fig. 2 is a diagram. The device contains a block 1 setting the control signal, the first 2 and second 3 keys, amplifier 4, frequency dividers 5 -54, the first proportional differentiating elements, the first demodulator) 7, AND element, PI-NE 8, delay element 9, assignment unit 10 for supply voltage jblock 11pacrush and indication unit 12 Node setting unit 10 for supplying voltage B1; ling: summation unit 13, block 14 1): integrated 1 , shaper 15 PULSES; the second proporidonal differentiating element 16, the second 17 and third 18 demodulators and the element And 19 ,. The control consists of the regulator 20 of the speed of the regulator 21 of the current, the sensor 22 of the current and the sensor 23 of the sprout, each of which is made in the form of a fire amplifier j including the adder 24-27 ,,; the integrator 28313 pulse former and. demodulating filter 36-39, as well as from the executive engine 40, the device operates as follows. Frequency divider 5, element 6, and demodulator 7 are used to detect the fault of the control system malfunction. The operation of all channel channels is similar. A daltier of frequency 5 forms a Tj-ma signal with a meander with zero value and a period of 2Td (Fig, 26). Element 6 having a transfer function of the form W (p) Tp / (Tp 1) is the separation the input circuit of the demodulator 7 at a constant current. Parameters of element 5 are selected so as to transmit the variable component of the output signal y (t) of the frequency divider 5 (Fig. 2 &) almost without distortion (Fig.). In the demodulator 7, the output VgCt pulses of element 6 are rectified (Fig. 2a) and, if necessary, are additionally filtered (Fig. 2, dashed line), for example, using a first-order passive aperiodic KS filter. Thus, a signal 1 is generated, indicating the operability of the corresponding controller of the electric drive. If signal 1 is present at the output of the demodulators, the output signal of elements 8 and 9 is zero. Blocks 13, 14 and 15 together form a self-oscillating system. At a zero signal level at the output of block 9, the output voltage y (t) of the driver 15 (Fig. 2) is a signal of the square wave type with an average zero value. Element 16 performs functions similar to the functions of elements 6 (-b4. With the help of demodulators 17 and 18, a constant voltage of negative and positive signs is formed, which serves to power the actuator controls. If there is an element 17 at the output and a signal 1 In the code of element 18 of output 10 is equal to 1., the voltage of node 10 is equal. In this case, the inputs of element 8 contain signals 1 and the output voltage of elements 8 and 9 is zero, the key 3 is in its initial closed state, and the input body 4 is connected to the output of the control system frequency divider 5 in the static state, for example + A (Fig. 2 &). Element 64 prevents the passage of a constant signal to the input of demodulator 7, therefore at time t, the voltage on the output of elements 64 reaches level O (Fig g), and the output member 8 of the signal is 1 (fig.2k), key 2 enters the off state by disabling the input of amplifier 4 the output from the electric control system inoperable.

With a delay T, a signal 1 is formed at the output of element 9 (Fig. 2g). The amplitude 1 is chosen so that it exceeds the allowable input signal of the cascade of blocks 13, 14 and 15. When this condition is fulfilled, the self-oscillation mode (fig.2g) disrupts the element 16 goes into a static state, and the voltage at the output of the element 16 and demodulators 17 and 18 are reduced to zero. This leads to the formation at the output of the element 19 of the signal O, due to which the command to switch the key 2 to the open state is duplicated. In addition, when self-oscillations break down, the supply voltage of the electric drive controllers decreases to zero, which ensures a zero level of voltage at their output. This increases the reliability of the device as a whole when a fault occurs in it.

Similarly, the device works when any other elements are inoperable.

The troubleshooting process in the control system is as follows.

When the output current controller is disconnected from the amplifier 4, the indicators of the unit 12 are switched to the operating state. To locate the fault location, key 3 is manually transferred to the open state. At the same time, the cascade of blocks 13, 1Д and 15 re-enters the self-oscillation mode, thereby forming the power supply voltage of the control system chips. By illuminating the indicator of a faulty path, an inoperable functional unit is detected, which is replaced by a healthy one. Thus, the maintainability of the electric drive is increased and the mode of searching for its malfunction according to the trial and error method is eliminated.

In the event of a malfunction in node 10, one of the inputs of element 19 produces a signal O, which leads to the appearance of signal 1 at the output of element 8 and the transfer of key 2 to an open state. When searching for a malfunction, which is carried out by turning off the contacts of the key, the indicators of the block 12 do not become inoperable, which indicates a malfunction of the elements of the node 10, which is to be replaced.

Failure of block 11 leads to de-energizing the elements of the control system, which eliminates the occurrence of light indications in block 12. The protection of the diagnostic system becomes inoperable when the shaper 35 goes into an uncontrolled zero output state. If a block has passed into zero unmanaged state

9, then the protection will work due to unlocking the key 2.

When element 19 is in a faulty state and its output signal is zero, the performance of the system is actually not monitored. However, when node 10 fails, the mode of self-oscillations in the control channels is impossible, which leads to the formation of a signal O at the output of the demodulators and the translation of the key 2 into an open state.

Thus, practically any malfunction in the circuit of the electric drive will lead to the disconnection of the output of the control system by it from the input of the amplifier 4 and to the diagnostics of this malfunction.

Claims (1)

Invention Formula f A device for monitoring an electric drive control system containing an OR-NOT element, a control signal setting unit connected to the control object input, the output of which is connected to the information input of the first key connected to the output through an amplifier with the input of the actuator engine, and four fault diagnosis channels, each of which contains a serially connected frequency divider, a first proportional-differentiating element and a demodulator, an output connected with the corresponding input of the block Indication and with the corresponding input of the element OR NOT, the output of which is connected to the control input of the first key and is the blocking output of the device, the input of each frequency divider is an information input of the device, characterized in that, in order to increase the number of monitored blocks of the drive control system The device contains a delay element, a second key, a block, a summation, an integration block, a pulse shaper, and a second proportional differentiating element, the second and third demodulators, and AND element, output connected to the fifth input of the display unit and the fifth input of the OR-NOT element, the output of which is connected via serially connected delay element, second key, summation unit, integrator, T2 86 pulse shaper and the second proportional-differentiating element with the second input and the third demodulator input, the output of each of which is connected to the corresponding input of the AND element and the corresponding power inputs of the control system, the power inputs of the integrator and the pulse generator They are connected to the outputs of the power supply. 2} ZD- / 1I -, jf J-jA-JT -Jj l-zP7 ii V. -w ™ , (t) - X2ft a 0 (Rig.