SU809075A1 - Device for relay command control - Google Patents

Description

(54) DEVICE FOR THE CONTROL OF RELAY COMMANDS

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The invention relates to test devices and can be used to monitor relay commands simultaneously generated by contact sensors.

A device comprising a relay switch, comparators, sources of reference voltages, a strobe device 1 is known.

The known device allows, in combination with a registering device, to control relay commands, but it does not have high reliability, since the switch self-control is carried out only over the current in the windings of the control relays, and the self-control of the relay contacts is not checked.

The closest technical solution is a device comprising a relay switch, inspected sensors connected to the switch, and a recording device 2.

The device has low reliability, as in the case of sticking of the switch contacts, the results of the monitoring are distorted.

The purpose of the invention is to increase the reliability of the device.

The goal is achieved in that a device for monitoring relay commands, containing a block of sensors for relay commands, is connected to the positive and negative poles of the power source and the first terminals of the control relay windings, two recording relays, the closing contacts of which are connected to the first terminals of the indicators, the second terminals which are connected to the negative pole of the power source, connected to the second terminals of the windings of the control relays, to increase the reliability of the device, introduced the element OR, two self-test relay and valve elements, winding of the first self-test relay by the first output is connected to the relay command sensor block, winding of the second self-checking relay by the first output is connected to the anode of the first valve element and through the changeover contact of the first self-check relay to the positive pole of the power source, the cathode of the first valve element is connected through the series-connected closing contacts of the control relays, the winding of the first recording relay to the change-over contact of the second relay The second, third and fourth valve elements are connected by anodes to the change-over contact of the first self-checking relay, and cathodes through the closing cocktails of the controlling relays to the inputs of the OR element, which is connected to the output through the series-connected winding of the second recording relay with negative the power supply pole and the second terminals of the windings of the first and second self-test relays.

The drawing shows a schematic diagram of a device for monitoring six relay commands.

The device contains control relays 1-6 with pins 1-1 ... 6-1, a block of 7 sensors of relay commands, a first self-checking relay 8 with contact 8-1, a second self-checking relay 9 with contact 9-1, valve elements 10- 13, the first registering relay 14 with contact 14-1, the second registering relay 15 with contact 15-1, the element OR 16, indicators 17 and 18.

The device works as follows.

In the absence of relay commands, the circuit operates in a self-test mode, in which the sticking of contacts I-I ... 6-1 of the relay is controlled, namely, the plus from the power source through contact 8-1 goes to the anodes of elements 10-12, if at least one contact group is stuck , this plus through the sticky group gets to the input of the element OR, as a result of which the relay 15 is activated and the indicator 18 lights up the banner “Fault.

With the arrival of relay commands, relay 1-6 and relay 8 are triggered. When contacts 8-1 plus are triggered from the power source, element 13 is fed to the beginning of the chain from contacts 1 - 1 ... 6-1, and when contacts 9-1 are activated, the relay 15 is turned off and the relay 14 is connected to the zero potential bus.

If all relay commands came from the block of 7 sensors of relay commands, then through the worked contacts. 1 -1 ... 6-1 relay 14 is activated and contact 14-1 turns on the indicator 17 of the banner “Norm. If at least one command from block 7 is missing. Then relay 14 does not work and the indication is. torus 17 is not included.

After the end of the relay commands, the circuit reverts to the self-test mode, and the sticking of the contacts 1-H ... 6-1 is monitored.

The technical and economic effect of using the invention is expressed in increasing the reliability of the device by introducing the self-test mode of sticking of the contacts of the control relays.

Claims (2)

1. Automatic control equipment. Ed. N. N. Ponomareva, M., “Soviet Radio, 1975, p. 288, fig. 9.3. 2. USSR author's certificate No. 494604, cl. G 01 D 7/02, 1973 (prototype).