SU708268A2 - Arrangement for automatic monitoring of electric circuits - Google Patents

Description

(54) DEVICE FOR AUTOMATIC CONTROL OF ELECTRICAL CIRCUITS

The drawing shows the functional diagram of the device. It contains switch 1 with outputs 1-1, 1-2 iK, which are connected to object 2 of the control, software block 3 with contacts 3-1, 3-2 and 3-K, control block 4, prohibition logic element 5, one-shot 6 ,

 The switch contains a relay 7 with contacts 7-1, 7-2, 7-K. Switch 1 through the resistors R1 ... RK is connected to the reference element 8.

Each output of switch 1 is connected via normally open contacts of the first contact group of relay 7 of switch 1 to the first input A of the response of the control unit 4 and the prohibition logic element 5 to the polling output D of the control unit 4, and through the contacts of the program unit 3 and the switching contact the second contact groups of the same relay 7 to the two other inputs B and C of the response of block 4 control.

The output E of the response of the control unit 4 is connected to the inputs of the switch 1 and through the one-shot 6 with the second input of the prohibition logic element 5.

The device works as follows. For example, it is necessary to carry out integrity control. The chain between the control points e and from the object of control, for ecm, let contacts 3-3 and 3-K be closed on the program block.

After starting the device, the first relay of switch 1 is triggered, connected by normally open contacts 7-1, the output D of polling of the control unit 4 to the control object point 2 via the open inhibiting logic element 5 and the output of the switch 1-1. At the same time, the polling signal is fed to the input A of the response of the control unit 4.

If the circuit (e-s) is open, the interrogation signal is fed to the input B of the response of the control unit 4 through the resistor R1, the circuit (el-cl) of the reference element 8, the short-circuit resistor, closed contact 3-3 of the program unit 3 and normally closed contacts 7-6 of the switch 1 Since the total resistance of the two resistors R1 and R3 is much greater than the sensitivity of the control unit 4, the latter, in accordance with the disconnected circuits, will show the presence of an open circuit in the tested circuit.

If the circuit (e-c) is good, both resistors R1 and R3 are shorted by a ring. In this case, the input to the Answer will receive a full signal. If there is a signal, the catch at the inputs A and B of the response in accordance with the table from the output E of block 4 of the control arrives, the signal to the inputs of the sounder 6 and switch 1.

The single-vibration 6 will close the inhibit logic element 5 and disconnect the interrogation signal from response A of output and output of switch 1. At that, contacts 7-1 and 7-2 will return to the initial state, and contacts 7-3 and 7-4 will switch.

After returning the one-shot 6 to the initial state, the inhibiting logic element 5 will open and the device will start checking the next circuit,

 for example (d-a) of the object 2. control.

If this circuit does not have an open circuit, pins 7-3 and 7-4 will return to the original state, and pins 7-5 and 7-6 will switch.

5 After the prohibition logic element 5 returns to the open state, the interrogation signal is transmitted to the response input A and through normally open contacts 7-5, closed contact 3-3

0 of software block 3, normally open contacts 7-6 to the input C of the response, block 4 control. If there are signals at the inputs A and C of the response in accordance with the table, block 4 controller will test the strength and insulation resistance test between the inputs B and C of the Response.

After checking the strength and resistance of the insulation block 4 control,

p depending on the state of isolation, either signals the presence of a scramble, or, in the normal state of isolation, it will signal the norm on the output E of the response.

 . Further, the verification process when the control object 2 is intact, i. in the absence of breaks and entrances, as well as with good insulation, it will proceed in the same way as described above, In the presence of a false jumper connecting the circuit (e-c-b) with the circuit (d-a), the device operates as follows.

After the operation of the third relay of switch 1 (contacts 7-5 and 7-6),

5, the polling signal from the output D through the logic element 5 of the prohibition is fed to the input A of the response and through the normally open contacts 7-5, the output of the switch 1-3 through two circuits through

Q closed contact 3-3, normally open contact 7-6 to the input from the response and the second circuit, through the contact from the circuit (e-с-b), dummy jumper, circuit (d-a), switch output 1-K,

3-K closed contact, normal

closed contact 7- (K-1) - to the input of the answer.

The polling signal in this case will be present at the three inputs A, B and C of the answer. The control unit 4, in accordance with the table, will perform a signal about the presence of a short circuit between the circuits, which must be separated.

If the scheme of object 2 of the control differs from the scheme of the reference element

Claims (2)

The claims .1. Device for automatic control of electrical circuits. According to copyright certificate No. 558232, characterized in that in order to reduce the test time, a reference element and resistors are introduced into it, each of the outputs of the switch connected to the corresponding contact of the reference element through resistor. 2. Device for automatic control of electrical circuits by π. 1,; characterized in that; the reference element is made according to the scheme of the control object.