JPS5816733B2 - Auxiliary relay circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an auxiliary relay circuit for increasing contact width, and particularly to a circuit technique for effectively monitoring the response state of an auxiliary relay.

Conventionally, when using an auxiliary relay to increase the open/close state of a switch or a contact, a keep relay (or stop relay) is used that mechanically or magnetically maintains the operating state.

- In this case, it is necessary to monitor whether the kit relay is responding correctly to the state of the Kawahara contact point.

FIG. 1 is a diagram showing one embodiment of a conventional system.

In the figure, 1a and 1b are anti-contact points, which have opposite opening and closing states to drive the stop relay.

K is a kit relay, operating coil KO1 return coil KR
and switching contacts Ka and Kb.

This relay is set to the Ka side by KO excitation, and set to the Kb side by K4 magnetization.

KA and KB are contacts that open and close together with the kit relay; KA is closed and KB is opened by KO excitation, and reversed by KR excitation.

Reference numeral 2 denotes an auxiliary relay, which has a contact 2b that opens when operating and closes when returning.

3 is a time-limited relay for abnormality detection.

In this circuit, when 1a is open and 1b is closed, the kit relay is on the Kb side, JA is open, and KB is closed, as shown.

2b is opened due to the operation of relay 2.

Now, when the state of the anti-contact points is 1b open circuit and 1a closed circuit, the operation is as follows.

By opening 1b, the excitation of relay 2, which has been activated in the circuit P-1b-KB-2-N, is released.

Next, due to the closing of 1a, the kit relay K is operated in the circuit of PlaK□-Kb-N, and KB is opened and KB is closed.

Due to the operation of the operating coil KQ, KA is closed and KB is opened, so that the relay 2 is operated again in the circuit of P-1a-KA-2-N.

Now, Kitsupurire is unresponsive (despite 1a closed, KO
In the case of non-operation), Ka and KA remain open, and relay 2 continues to be in a non-energized state, so 2b
The circuit P-2b-3-N detects an abnormality in response of the relay 3 by the relay 3.

In such a conventional system, an abnormality in 1a11b can be detected at any time, but it is the main cause of failure of the relay relay.

Since it is not possible to detect disconnections in the coils KO and KR, contact defects in the Ka and Kb contacts, and defects in the wiring route of the excitation circuit of the kit relay before the relay starts operating, abnormalities in the kit relay are detected only when the counter contact changes. This is not desirable because it is a method of ``judging from the results.''

Furthermore, since the representative contact KAtKB is used exclusively for monitoring purposes, there is a drawback that the expanded contact of the kit relay cannot be used for other purposes.

FIG. 3 shows a conventional kit relay operating state display circuit in which red and green signal lights are simply turned on by the kit relay's auxiliary contacts KA and KB.

According to this, the red and green signal lights will light up depending on the operation and return status of the counter contacts 1a and 1b and the reset relay only when the operating states match, and if either lamp is lit, the reset relay will operate correctly. This means that the operation is consistent with that of the contact, but as in the case of Figure 1, a malfunction of the kit relay can only be detected when the state of the opposite contact changes.
It had the disadvantage of having dedicated representative contacts KA and KB.

In view of the above, an object of the present invention is to provide an auxiliary relay circuit that can constantly monitor the kit relay.

In the present invention, by providing an abnormality detection means between the connection point between Kb and Shame and the connection point between Ka and KR, the next relay coil to be activated is constantly monitored.

One embodiment is shown in FIGS. 2 and 4. In the figures, the same parts as in Figures 1 and 3 are represented by the same symbols.

Figure 2 shows a method that eliminates the disadvantages of the conventional circuit system shown in Figure 1. 4 is a voltage relay with a coil resistance value larger than that of KO2KR; This function is equivalent to the voltage relay 2 in the above.

Now, when the states of anti-contact points 1a and 1b are 1b closed and 1a open, relay 4 operates in the Plb-KR-4-Kb-N circuit, but the voltage applied to the KR coil is
Since the coil resistance value of the relay 4 is sufficiently large compared to that of the KR, most of the operating voltage between P and N is applied to the relay 4, which is a sufficiently small value, so that the KRIJ relay does not react.

Next, when anti-contact 1b is open and 1a is closed, P l
In the circuit aK□KbN, a voltage between P and N is applied to the operating coil Ko of the relay, and the relay is switched to the operating state.

When the relay K is activated, Kb is opened and Ka is closed, so that a circuit of 04 Ka N is formed at P 1a and P 1a .

At this time, the relay 4 has returned to its original state during the transition of relay operation (when switching between K, b and Ka), but is again in the operating state.

That is, at the same time as the relay shown in FIG. 1, relay 4 returns only while relay K is in the middle of switching the opposite contact, but as long as relay K is normal, the time during which the relay K is returning is This is a very short time, about the same as the response time.

In short, as long as the auxiliary relay circuit is normal, relay 4
is constantly energized and continues to operate.

Note that when a circuit of □ -4-K a-N is formed in P-1a -, KO does not operate, as in KR.

On the other hand, when the response of the relay is abnormal, the relay 4 remains in its reset state, so that when the 4b contact is closed for more than the operating time of the relay 3, an abnormality in the relay is detected.

The major differences between the conventional method shown in FIG. 1 and the method of the present invention shown in FIG. It is possible to constantly monitor abnormalities such as

In particular, among the relay coils KOtKR, the relay coils that will be in the operating state next time and the contacts that will be closed thereby (
When 1b is closed, range and Kb are constantly monitored, and when ia is closed, KO and Ka) are constantly monitored, so the anti-contact point 1a
, 1b changes, it is possible to detect defects in Kb and Ka.

(2) Since dedicated representative contacts KA and KB are not used for monitoring purposes, the relay contacts can be used for other purposes.

FIG. 4 shows the case where this method is applied to a method of displaying the status of a relay.

In the same figure a, RECl and R and RFe5 and G are
This circuit is for displaying the operating state of the IJ relay, and is composed of a reverse current blocking diode REC and indicator lights R and G, and has the same display effect as R and G in the circuit shown in FIG.

The same figure shows a case where a two-color LED is used. For example, 5 has a circuit of □ -R-5-Ka-N in P-1a-, and when current flows, it emits red light. , 6 is P-
It is designed to emit green light when current flows through the circuit 1b-KR-e-R-Kb-N.

R here represents a resistor. The operation of the circuit shown in FIG. 4 is exactly the same as that shown in FIG. 2, except that a display section having directionality is provided in the relay 4 section of FIG.

It is obvious that a simple lamp may be provided in place of the relay 4 if it is not desired to indicate whether the relay is operating or has returned, but only to indicate that it is normal.

As described above, in the present invention, a more effective relay can be used to monitor the consistency of the condition of the stock solution point without using a dedicated monitoring contact as in the conventional system.

This embodiment in which voltage relays and the like are provided on the sides of the switching contacts Ka and Kb of KO and KR has the advantage of being easy to unitize.

In other words, for example, 10 sets of contacts can be obtained with one kit relay, but if several tens of contacts are required, multiple kit relays may be connected in parallel to respond to one set of undiluted solution points, and the voltage relay 4 switches. Since it is located on the side of contacts Ka and Kb, it is possible to detect an abnormality in one unit.

[Brief explanation of drawings]

Figures 1 and 3 are conventional circuit diagrams, and Figures 2 and 4 are conventional circuit diagrams.
The figure is a circuit diagram showing one embodiment according to the present invention. K...Kitsupurirei, KO2KR,...
・Operating coil and foot coil, Ka, Kb...
・A contact, B contact, 2, 3.4... Relay for abnormality detection.

Claims (1)

[Claims] 1. A first series circuit provided in the order of a first counter contact, a first relay coil, and a switching contact from a first power bus and connected to a second power bus; a second series circuit provided in the order of a second counter contact, a second relay coil, and the switching contact from the power supply bus and connected to the second power supply bus; a switching contact of the first series circuit; Connection with relay coil,
An auxiliary relay circuit comprising an abnormality detection means provided between a switching contact of a second series circuit and a connection point with a second relay coil, wherein either of the first and second anti-contact points is Only one side is in the closed state, and the switching contact is closed to the second series circuit side by the operation of the first relay coil, and closed to the first series circuit side by the operation of the second relay coil. , the first
An auxiliary relay circuit characterized in that the relay coil or the second relay coil is made inoperable. 2. The auxiliary relay circuit according to item 1, characterized in that a voltage relay is used as the abnormality detection means. 3. The auxiliary relay circuit according to item 1, characterized in that a light emitting means is used as the abnormality detection means.