DE1038611B - Ambiguity checker for outputting a signal when several relays of a plurality of functionally related relays simultaneously assume a certain switching state - Google Patents

Description

Certain organs in telephone switching systems contain a large number of relays or corresponding circuit elements, of which, if the organ is working properly, never more than one is in working position. There can also be several such groups of in one organ Relays for which the specified condition applies, can also be present in a telephone switching system several such organs may be present. The proper working of such a group of relays can now be done in the manner be monitored that one determines with the help of a test device whether there is more than one relay at the same time is in the working position, i.e. is excited. If this is the case, a display device is actuated or a signal to report this error is issued. Such a test device can be called an ambiguity checker to name.

Experience has shown that such an ambiguity checker must be sufficiently reliable works, meet various requirements; so he should be insensitive to disturbances, they should monitored relays only need a single additional contact for the purpose of monitoring, there should be no special tolerance conditions for the circuit elements of the ambiguity checker must be provided, inter alia. m.

For example, an ambiguity checker can use relays that receive intermittent fault current, being constructed. Such a circuit is shown in FIG. With this circuit must certain tolerance conditions for the operating currents of the relay are maintained, which is a disadvantage the circuit is. This is explained in more detail on the basis of the following explanations.

In the circuit according to FIG. 1, the potential difference that occurs between two of the contacts that are controlled by the relay to be monitored is evaluated in order to make the display element respond. This circuit has, for example, five relays to be monitored. Each relay controls a test contact. These contacts are located between the corresponding ends and taps of two series circuits of four equal-sized resistors R 11 each. . . R 14 and R 21 ... R 24. The series connection of the resistors R 11 ... i? 14 is fed with the voltage U from a DC voltage source. An indicator relay M is connected to the ends of the series connection of the resistors R 21 ... R 24. If only a single test contact is now closed, the relay M receives no current, since there is no voltage between its two connections. If, on the other hand, two test contacts are closed, e.g. B. the contacts a1 and a2, so will

Ambiguity checker for submission

of a signal when several relays of a plurality of functional at the same time

relays that belong together
assume a certain switching state

Applicant:

Siemens & Halske Aktiengesellschaft,

Berlin and Munich,
Munich 2, Witteisbacherplatz 2

Dipl.-Ing. Karl-Heinz Widdel, Munich,
has been named as the inventor

one terminal of the relay M via the contact al the voltage U and the other terminal of the relay M via the resistors R 24, J? 23, i? 22 and via the contact α 2 a lower voltage, so that because of the voltage difference Current flows through the relay M at its terminals and is thus excited. The effective voltage difference is smaller al in this operating case, because of the division of the total voltage on the order of the resistors as a quarter of the total voltage U. If, for example in another case, the contacts and closed a 5, so the relay M receives the undiminished total voltage U. In Monitoring of five relays, the voltage at the display relay M ^{fluctuates here from about 1} A U to U, i.e. more than four times as much. If more than two contacts are actuated by the monitored relays at the same time, the voltage at the indicator relay is mainly determined by the contacts that are furthest apart. This circuit has several disadvantages. Even when the circuit is in the rest position, a current flows through the resistors R 11 ... R 14 which is of the same order of magnitude as the current during operation. In addition, the voltage applied to the display relay fluctuates considerably as a function of the various switching states, which is very disadvantageous for the reliability of the operation of this relay. The fluctuation is greater, the more relays are monitored. You can only monitor a limited number of relays with this circuit.

S09 637/123

Claims (3)

A circuit is already known for solving the problem, which in itself is quite analogous, in which it is necessary to check whether more than two relays of a group of several relays are in the working position at the same time. (Bell Lab. Record, January 1952, -Vol. XXX, No. 1, p. 11). In this circuit, the monitoring is carried out with the help of a contact pyramid, which is formed from contacts that are controlled by the relays to be monitored. If a larger number of relays is to be monitored, the disadvantage here is that many contacts are connected in series and malfunctions occur because of the addition of the contact resistance. In addition, each monitored relay must have several additional contacts. The circuit according to the invention avoids the disadvantages of the circuits specified above. It is an ambiguity tester that emits a signal when several relays of a plurality of functionally related relays simultaneously assume a certain switching state in which a test contact assigned to each of the relays is closed. It is characterized in that two receiving organs, which respond when the control voltage at their control electrodes exceeds a certain level, receive their control voltages via i? C elements when closing test contacts in such a way that when a single test contact is closed, both receiving organs respond at the same time that but when several test contacts are closed at the same time, one receiving organ responds earlier than the other and that the earlier response of one receiving organ actuates a display device controlled by the two receiving organs. In Fig. 2, an embodiment of the circuit according to the invention is shown. Each of the relays to be monitored has a test contact α (al... An) for the purpose of its monitoring. One of the connections of these contacts is connected to the trigger +0 work contact p, via which the control voltage for the receiving elements is supplied and whose actuation therefore triggers the test. To the other connections of the contacts al. . . there is a resistance each if Il. . . RIn and one guide Gl ... G η each excluded. The resistors R11 ... Rl η lead to the i? C element of the one receiving organ (tube Vl). The directional conductors Gl ... Gn, polarized in the same way and permeable under the influence of the control voltage, lead to the resistor R21, which is connected to the ifC element of the other receiving organ (tube VZ). The ifC elements of the receiving organs consist of a parallel connection of a resistor R1 or R2 and a capacitor C1 or C2, one end of which is connected to earth. At the other end of the parallel circuit, to which the control voltage is supplied, the control electrode of the receiving element (F1, V2) is connected at the same time. As receiving organs you can z. B. tubes, preferably gas discharge tubes, use. With these, it is advisable to connect a protective resistor directly to the starter to limit the starter current. These are the resistors i? 10 and if20 at the tubes V1 and V2. In the main circuits of the tubes there is a relay Ml and MI, which are energized after the tubes have been ignited and each have a changeover contact tn 1 or »2. These changeover contacts are connected in series and are in the circuit of a third relay M 3, the indicator relay. This relay has a normally open contact m 3, via which the relay M 3 holds itself in a self-holding circuit after it has been made to respond once. The series connection of the contacts ml and w2 is chosen so that in different operating states of the associated relays Ml, M2 the relay M 3 controlled by them is made to respond, while in the same operating states no current flows through the contacts ml and m2 and therefore the relay M 3 cannot respond. The resistors R1 and R2 are the same size, as are the resistors R11. . . R1 η and R21. If only a single working contact, e.g. B. al, is actuated and the release contact p is closed, the capacitors Cl and C 2, which are equal to each other, charge simultaneously and at the same speed. The resistor acts as a charging resistor for the capacitor Cl and the resistor R21 as a charging resistor for the capacitor C2. Both charging resistors are the same. The starter ignition voltage is therefore reached at the same time for both tubes V1 and V2, and both tubes ignite at the same time. The relays Ml and M2 are therefore excited at the same time and switch their changeover contacts m 1, «2 at the same time, so that no closed circuit is created for the indicator relay M Ά. If, on the other hand, two of the working contacts, e.g. al and a2, have been actuated at the same time, when the release contact p closes, the capacitor Cl is charged via two or more parallel-connected charging resistors if 11, i? 12, while the capacitor C2 is only charged via one of them associated charging resistor i? 21 is charged. The Konden satorCl is therefore charged much faster, and the tube V1 ignites earlier than the tube V2. During the period in which the two tubes have different operating states, the relay M 3 receives current and furthermore continues to hold with the help of the self-holding contact m3; at the same time there is a display of the faulty state of the monitored organ. The devices for deleting the tubes in order to make the ambiguity checker ready for a new test are immaterial here, since they have no direct connection with the invention; they are therefore not included in the circuit shown. P A T H N T A N 'S P V. C Π II E: 1. Ambiguity checker to issue a.> Signal when several relays eini plurality of functionally related relays assume a certain switching state in which a test contact assigned to each of the relays is closed, characterized in that two receiving organs {VI, V2) that respond , if the .Control voltage on their control electrodes exceeds a certain size, receive their control voltages via ifC members (ifl, Cl; if2, CZ) when closing test contacts in such a way that when a single test contact is closed, both receiving organs (Vl, V 2) simultaneously respond, but that when several test contacts are closed at the same time, one receiving organ (Vl) responds earlier than the other and that a display device controlled by the two receiving organs is actuated by the earlier response of one receiving organ (Vl). 2. ambiguity tester according to claim 1, characterized in that each of the functionally related relays (Al... An) has a test contact used for ■ the test device (al ... an) , and that these test contacts on the one hand to a trip work contact (p .), is supplied via the during the test period sufficient for addressing the receiving organs control voltage, and on the other hand, to each an equal resistance (i? ll.. RIn) and an isolator each located under control voltage in the on state (Gl ... Gn) are connected, and that the resistors (i? ll ... RIn) lead to the i? C element (Rl, Cl) on the control electrode of a receiving organ (Vl) and the directional conductor (Eq... Gn) via one of the previous (RIl... RIn) same resistance (R 21) to i? C element (R2, C2) lead to the control electrode of the other receiving organ (V 2). 3. Ambiguity tester according to claim 1 or 2, characterized in that gas discharge tubes (V) are used as receiving organs, in the main circuits of which an auxiliary relay (Ml, M2) is looped in, each of which has a changeover contact (ml, m2) , and that these Changeover contacts (ml, m 2) connected in series in the excitation circuit of an indicator relay (M 3) with a self-holding circuit and arranged so that a current can flow through them only when the auxiliary relays (Ml, M2) are in different operating states. Considered publications:
“Bell Laboratory. Record ”, January 1952, p. 11. 1 sheet of drawings ® 809 637/125 9. 58