JPS5816732B2 - 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 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 keep 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 opposite contacts and have opposite opening and closing states to drive the keep 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 KR excitation.

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, KA 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 in an operating state in the circuit P-1b-KB-2-H, is released.

Next, by closing the circuit 1a, the kit relay K operates in the circuit P-1a-KO-Kb-N, and KB is opened and KB is closed.

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

If the kit relay is unresponsive (KQ does not work even though 1a is closed), Ka and KA remain open, and relay 2 continues to be in a non-energized state, so 2b closes and P- In this conventional method, in which abnormal response of the kip relay is detected by relay 3 in the circuit 2b-3-H, abnormalities of Ia and lb can be detected at all times, but the main cause of the non-response of the kip relay is the coil. KO2KR disconnection, Ka
Since it is not possible to detect a contact failure of the Kb contact or a problem with the wiring route of the excitation circuit of the kit relay before the relay starts operating, it is not possible to detect a malfunction of the kit relay until the counter contact changes. ” method, which is not desirable.

Furthermore, since the representative contacts KA and tKB are used exclusively for monitoring purposes, there is a drawback that the wide contacts of the kit relay cannot be used for other purposes.

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

According to this, the red and green signal lights will light up depending on the operation return state only when the operating states of anti-contact points 1a and 1b and the kip relay match, so that the kip relay will not react correctly with any of the luff fishing lights. This means that the operation is consistent with that of the contacts, but as in the case of Figure 1, malfunctions in the kit relay can only be detected when the state of the opposite contacts changes, and the drawback is that they have dedicated representative contacts KA and KB. was there.

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

In the present invention, by providing abnormality detection means between the connection point between IQ and KO and the connection point between 16 and the plate, the next relay coil to operate 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 system that eliminates the drawbacks of the conventional circuit system shown in Figure 1. 4 is a voltage relay with a coil resistance larger than that of KO2KR;
It functions equivalent to voltage relay 2 in the figure.

Now, when the states of anti-contact points 1a and 1b are 1b closed and 1a open, relay 4 operates in the P-1b-4-I (0-Kb-N circuit, but the voltage applied to the KO coil Since the coil resistance value of relay 4 is sufficiently large compared to that of KO, most of the operating voltage between P and N is applied to relay 4, and the voltage is a sufficiently small value, so KO relay does not respond.

Next, when anti-contact 1b opens and 1a closes, P-1a
K□ Operating coil K for relay in Kb-N circuit
A voltage between P and N is applied to O, and the relay is switched to the operating state.

When the relay K is in operation, Kb is opened and Ka is closed, so that a circuit of P 1a 4 KB, Ka N is formed.

At this time, during transient operation of the relay (when switching between Kb and Ka)
Although the relay 4 has returned to its original state, it becomes operational again.

That is, like the relay 2 in FIG. 1, the relay 4 returns only while the relay K is in the process of switching the opposite contact, but as long as the relay K is normal, the time during the return is as follows: This is a very short time, about the same as the response time for a relay.

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

Note that when the P Ia 4 KRKa N circuit is formed, KR does not operate as in the case of KO.

On the other hand, when the response of the relay is abnormal, the relay 4 remains in its reset state, so 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. Abnormalities can also be monitored at all times.

In particular, among the relay coils Ko and KR, the relay coil to be activated next and the contact (16
K when is closed.

, Kb>Ia is closed, KR, and Ka) are constantly monitored, so K is closed before anti-contact points 1a and Ib change.
b. It is possible to detect defects in 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 circuits for displaying the operating status of the relay, and are composed of a reverse current blocking diode RFC, an indicator light, and R2O. It has the same display effect as G.

The figure shows a case where two-color LEDs are used. For example, 5 emits red light when a current flows that creates the P Ia R5KRKa -N circuit, and 6 emits red light, which creates the P-1b-6-R circuit.
-KO-Kb is designed to emit green light when current flows through the circuit.

Here R indicates 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, it is possible to use a more effective relay to monitor whether the condition of the stock liquid point matches, without using a dedicated monitoring contact unlike the conventional system.

[Brief explanation of drawings]

1 to 3 are conventional circuit diagrams, and FIGS. 2 and 4 are circuit diagrams showing one embodiment of 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 the power supply bus, the second counter contact, the second relay coil, and the switching contact and connected to the second power supply bus, the first counter contact of the first series circuit; An auxiliary relay circuit comprising an abnormality detection means provided between a connection point with the first relay coil and a connection point between the second counter contact point of the second series circuit and the second relay coil. Therefore, only one of the first and second anti-contact points is in the closed state, and the switching contact is in the closed state.
By the operation of the relay coil, it is closed to the second series circuit side, and by the operation of the second relay coil, it is closed to the first series circuit side, and the current flowing to the abnormality detection means causes the first relay coil or An auxiliary relay circuit characterized in that 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.