DE1052475B - Circuit arrangement for the optional connection of a central point with only one of several connection points - Google Patents

Description

GERMAN

In several plants, e.g. B. in telephone systems, the requirement is often made to provide a central office, which should be able to selectively connect to only one of several connection points to kick.

There are similar needs with regard to central control points for electrical systems the measurement of electrical quantities (voltage, current, frequency or the like) at different Place the plant.

In telephone systems, the problem has been solved so far that override keys with two Fixed positions are provided, these keys being mechanically coupled to one another in such a way that pressing a key automatically triggers another key that may have been previously pressed caused.

With this arrangement, a connecting line must go from the central point to each connection point be guided.

The present invention has for its object the mechanical coupling between the various To replace buttons with an electrical control and to simplify the connections in that the individual connections between the central point and the separate connection points via a common line can be established, to which the named connection points each by remote control can be switched on.

In known arrangements of this type, which work without mechanically coupled keys, is either a relatively large number of connection and Control lines required and / or come Chain connections of normally closed contacts are used. Now, on the one hand, there is the management expense of these arrangements economically disadvantageous; on the other hand, but also of break contacts in a chain circuit, with Consideration of operational safety, should be avoided.

The invention therefore relates to a circuit arrangement for the optional connection of a central point each with only one of several connection points that are connected to a common line via contacts of On the part of the central station controlled connection relays can be switched on, their response circuits each via a individual control wires and their holding circuits originating from the associated switch-on button in the central station run over a common holding conductor, especially for telephone systems. She solves the asked Task and eliminates the disadvantages mentioned by the fact that in the central office one during each Actuation of a switch-on button that becomes effective and a button control relay in the holding wire of the switch-on relay horizontal switch-on monitoring relays are provided and that

Circuit arrangement for optional
Connection of a central point with only one of several connection points

Applicant:
Siemens Societä per Azioni,
Milan (Italy)

Representative: Dipl.-Chem. Dr. phil. E. Storm,
Patent attorney, Munich 23, Leopoldstr. 20th

Claimed priority: Italy from September 29, 1953

Dr.-Ing. Giorgio Dal Monte, Milan (Italy),
has been named as the inventor

a) the key control relay short-circuits a low-resistance winding of the switch-on monitoring relay each time a key is pressed by means of a normally open contact and, by opening a normally closed contact, cancels the short-circuit of a high-resistance winding of the energized switch-on monitoring relay;
b) the switch-on monitoring relay prevents the closing of a circuit prepared by pressing another switch-on button as long as it is still receiving power via the holding winding of a switch-on relay by means of a normally closed contact common to all control cores.
An exemplary embodiment of the subject matter of the invention is shown in the drawing.

P designates the central point, C ₁ ... C _n the mutually separate connection points and a, b the wires of the common connection line.

It is assumed for the time being that there is no connection and that the officer at the central office wants to get in touch with connection point C _1; for this purpose she briefly presses the corresponding key T _r

This key has two contacts, of which the first (T ₁ ¹ ) closes the circuit for the key control relay G , which responds. Since the switch-on monitoring relay K is in the rest position, the second button contact (T ₁ ¹¹ ) closes the following circuit:

+, k _v g _v T ₁ ¹¹ , control wire from the central point to the connection point C _v J ₁ ¹ ,

809 769/129

Claims (3)

The relay Z1 of the connection point C1 responds via its first winding and closes the three contacts ^ 1, I12 and i'j3. The first two contacts switch wires a1? ^ 1 of the connection point C1 to the incoming line a, b from the central point, while the third Kontakti13 connects the second winding Z111 of the relay J1 to the common holding wire leading to the relay A in the central point. As long as the officer presses button T1, both windings of relay J1 receive power from: +, kv Jf1, T111, control wire, J11, -; +, Jf2, k2, holding lead, J111, -. The relay K cannot respond because its winding A'1 is also short-circuited through the contact jf2 and its winding A'11 through the contact k2. As soon as the officer releases the button T1, the winding Z11 is de-energized, but the relay Z1 holds itself through its second winding, while the relay G drops out. The contact If3 keeps the winding An short-circuited, while the opening contact Jf2 switches the low-resistance winding A1 into the common holding circuit, in which the relay Z1 continues. Relay A responds and opens its controls ^ 1 and k2. If the officer at the central office calls another connection point, e.g. B. wants to turn on the connection point Cn, then she presses the corresponding key Tn, and the relay G responds via the contact Tn1 again. Since the contact Ji1 is open, the winding Jn1 receives no current for the time being; At the holding wire, the contact jf2 switches off the low-resistance winding A1, while the contact jf3 switches on the winding A11. The latter has such a resistance that the relay Z1, which is still connected to the holding wire, drops out, while the relay A continues to hold. After contact J13 has opened, relay K also drops out; the connection point Cn is then connected in the manner already described for point C1. The relay Jn responds and is maintained via the following circuits: +, kv Jf1, Tn11, control wire, Jn1, -; +, Jf2, k2, Halteader, ins, Zn11, - as long as the officer presses the key. After the relay G has dropped out, the relay Jn continues to hold on: +, A1, jf3, Halteader, ins, Zn11, -. Relay A responds again in this circuit. The officer is connected to the wires an and bn of the connection point Cn via the contacts in1 and in2. If the officer now wants to switch off again without connecting to another connection point, then she presses the disconnect key Te, which causes the relay G to respond without a response circuit for any connection relay being closed via the control wires. As already described, the contacts Jf2 and Jf3 replace the low-ohmic winding of the relay A on the holding wire with the high-ohmic winding; the relay Zn and the relay A drop out one after the other. As soon as the officer releases the Te button, the relay G also drops out, and the entire arrangement returns to the rest position. Patent claims: 1. Circuit arrangement for the optional connection of a central point with only one of several connection points, which can be connected to a common line via contacts from the switch relays controlled by the central point, the response circuits of which are each via an individual control wire and their outgoing from the associated switch-on button in the central point Holding circuits run over a common holding wire, in particular for telephone systems, characterized in that in the central station (P) a key control relay (G), which becomes active each time a switch-on button _{(T 1} to T _n ) is pressed, and a switch-on relay (Z ₁ to J _n ) lying connection monitoring relay (A) are provided and that a) Key Control relay (G) jf with each button actuation means of a working contact ₍₂₎ short-circuiting a low winding (I) of the power-monitoring relay (A) and jf by opening a rest contact _(3), the short circuit a high-impedance winding (II) of the excited Interfacing -Monitoring relay (A) cancels; b) the turn-on monitoring relay (K) through a common for all the control conductors break contact (^ ₁₎ closing a so long prevented by actuating a further Anschaltetaste (T _s) prepared control circuit (for J _s), as it is still on the holding winding ( Z ₁ ¹¹ ) a connection relay receives power. 2. Circuit arrangement according to claim 1, characterized in that the two windings of the connection monitoring relay (A) are dimensioned such that the holding winding (Z ₁ ¹¹ to Z _n ¹¹ ) of the respective connection relay (Z ₁ to J _n ) via the low resistance Winding (A ¹ ) holding current and fault current via the high-resistance winding (Zf ¹¹ ). 3. Circuit arrangement according to claim 1 and 2, characterized in that, in addition to the _{switch-on buttons (T 1} to T _n ), which simultaneously switch on a switch-on relay ( _{Z 1} to J ₇₁ ) and the common button control relay (G) _{, a disconnect button (T e} ) is provided through which only the key control relay (G) is energized. Considered publications:
German patents No. 846 566, 709 626,
200 1 sheet of drawings