JPH0447625A - Relay check device - Google Patents

Abstract

PURPOSE:To prevent any unnecessary check when one of the input signals for starting the check of the second relay is not good by providing a first auxiliary relay operated by the checking results of the first relays, a second auxiliary relay operated by the satisfaction of the starting conduction of a checking circuit and a checking circuit which makes the second relay to operate for checking by the 'AND' condition of both operations of the second and the first auxiliary relays. CONSTITUTION:The device is composed of a contact 9 operated by the checking results of relays 1, an auxiliary relay 10 excited by the operation of the contact 9, a contact 11 made by the excitation of the auxiliary relay 10, a contact 17 closed by satisfaction of the starting condition of a checking circuit, an auxiliary relay 18 excited by the make of the contact 17, a contact 19 closed by the excitation of the auxiliary relay 18 and relays 3 operated by the make of both contact 19 and the contact 11. Namely, when the checking results of the first relays 1 are good, the contact 9 outputs its signal in company with this, the contact 17 closed by satisfaction of the check starting condition also outputs its signal so as to make the auxiliary relay 18 to operate. With input of a signal to the contact 11 of the auxiliary relay 10, the contact 19 of the auxiliary relay 18 is inputted, and when the two contacts are closed simultaneously, the second relays 3 start to check. Therefore, the unnecessary check is prevented when either of the two inputs is not good.

Description

[Detailed description of the invention] “One of the inventions”] (Industrial application field) The present invention relates to a relay inspection device that prevents unnecessary inspections.

(Prior art) Conventionally, when a series circuit of the relay output in the first relay and the relay output of the second relay is output to the outside and an inspection switch is input to the relay, the A bypass command is issued, the auxiliary relay is operated, and its contacts bypass the relay output circuit, and the output to the outside is the output of the relay that has not been inspected.
The relay performs a self-inspection internally, and when the inspection results are positive, it outputs a contact, activates the auxiliary relay, completes the inspection, and returns the relay to normal operation.

Next, in the second relay, when the contact of the auxiliary relay is input, a bypass command is issued before the relay is inspected, the auxiliary relay is activated, the contact bypasses the output circuit of the relay, and the output circuit is sent to the outside. The output will come from the relay that has not been inspected, and after that, the relay will self-inspect itself, and the auxiliary relay will be reset when the inspection is complete.

Then, the contacts of the auxiliary relays are connected to the heads of the auxiliary relay coils, so the auxiliary relays do not operate at the same time.
There is no unnecessary output to the outside during inspection.

(Problem to be solved by the invention) In the conventional relay inspection device, if a contact outputs an incorrect output due to an abnormality in the output element of the first relay or an abnormality in the output board, or if there is an abnormality in the input element of the second relay or There was a drawback that if it was recognized that the contact was inputting due to an abnormality in the input board, it would lead to an unnecessary inspection of the second relay.

The present invention is designed to prevent the contact from erroneously outputting even if the contact outputs incorrectly due to an abnormality in the output element of the first relay or an abnormality in the output board, or if the contact outputs incorrectly due to an abnormality in the input element of the second relay or an abnormality in the input board. The purpose is to prevent unnecessary inspection of the second relay even if it is recognized that input is being made.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a first relay that operates according to the inspection result of the first relay.
A second auxiliary relay that operates when the activation condition of the inspection circuit for the first auxiliary relay is established; and a second auxiliary relay that operates when the activation condition of the inspection circuit for the first auxiliary relay is established; This is a relay inspection device comprising an inspection circuit for inspecting and operating the relay.

(Function) In the method of sequentially self-inspecting two relays, a signal is passed from the first relay to the second relay, the second relay is inspected, and the inspection of the first relay is started. When the output of these signals of the first relay is defective, or the input of these signals of the second relay is defective, the 2
Prevents defective inspection of the second relay.

(Example) Next, an example of the present invention will be described. Fig. 1 shows a contact 9 that is activated according to the inspection result of the relay 1, an auxiliary relay 10 that is energized by the activation of the contact 9, a contact 11 that is closed by the excitation of the auxiliary relay 10, and a circuit that closes when the activation conditions for the inspection circuit are met. A contact 17, an auxiliary relay 18 that is energized when the contact 17 is turned on, and a contact 19 that is closed when the auxiliary relay 18 is energized.
1, and a relay 3 that is operated by closing the contacts 19 and closing the contacts 11.

That is, when the inspection result of the first relay is satisfactory, the contact 9 is output, and the contact 17, which closes when the inspection start condition is satisfied, is also output, and the auxiliary relay 18 is operated.

In the second relay 3, the contact 11 of the auxiliary relay 10 and the contact 19 of the auxiliary relay 18 are input, and inspection is activated when these two contacts are closed at the same time. In other words, if one of the two workers is defective, unnecessary inspections are prevented.

In the above configuration, even if the contact 9 outputs an incorrect output due to an abnormality in the output element of the first relay 1 or an abnormality in the output board, or
Even if it is recognized that the contact 11 is receiving an input due to an abnormality in the input element of the first relay 3 or an abnormality in the input board, unnecessary inspection of the second relay 3 can be prevented.

[Effects of the Invention] According to the present invention, in a method of sequentially self-inspecting two relays, it is possible to prevent unnecessary inspections due to a failure of a single manual signal for starting the inspection of the second relay.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an inspection device showing an embodiment of the present invention. 1゜3...Relay 2゜4...Relay output...Inspection switch 12...Bypass command 10゜18...Auxiliary relay 9゜11゜19...Contact

Claims (1)

[Claims] A first auxiliary relay that operates according to the inspection result of the first relay 1, a second auxiliary relay that operates when the activation condition of the inspection circuit for the first auxiliary relay is satisfied, and this second auxiliary relay and the first auxiliary relay A relay inspection device comprising: an inspection circuit that operates a second relay for inspection using the operation of the auxiliary relay as an AND condition.