DE1020911B - - Google Patents

Description

In order to prevent several drive messages from being arranged within a loop If several detectors are triggered at the same time, mutilations of messages occur, that's it known to arrange release magnets in a special "so-called locking loop, which only ever release a detector to expire. This means that only a single detector is triggered even if it is triggered at the same time can run, it has already been proposed in these systems that the coil lying in the blocking loop of the To short-circuit the release magnet in the idle state and only when a detector is intended to be triggered to open this short circuit. At the same time, after a detector has been released, the power supply is used for the drain to the loop containing the release magnets interrupted, so that no further release magnet can address more.

In this arrangement, the dimensioning of the switching means in the control center that is responsible for the disconnection the detector containing the tripping magnets causes special demands, because on the one hand the shutdown should take place as short as possible so that the opening of the short circuit on one other release magnet can not be effective, and on the other hand it is still ensured that the release magnet of the first activated detector also responds and initiates the process of this detector.

Further difficulties arise when, as is usually the case, the Äuslösemagnete in Morse code security placed in the loop so that messages can be issued if the loop is faulty is possible. In this case, when opening the short circuit at the same time, several tripping magnets occur Current branches that also allow more than two tripping magnets to respond.

There are also alarm systems known in which precautions have also been taken that Simultaneous activation of several detectors does not lead to any malfunctions in the recording of messages and which still manage without a special line loop, such as the ones in the above systems. These arrangements have magnets connected to the detector loop, which continue to run of a detector if at the same time another detector ^ already receives impulses from the relevant Loop conductors are given. Such arrangements are very complex in terms of circuitry and above all require a fine attitude and careful care. The in the real Locking magnets placed in the detector loop may only be used with very specific voltage and Address current ratios in this loop, these voltage and current ratios at each Signaling system with several drive signals arranged in a loop

Applicant:

Telefonbau und Normalzeit GmbH, ίο Frankfurt / M., Mainzer Landstr. 134-146

Otto Sautter, Frankfurt / M., Has been named as the inventor

Detection point are different due to the different line resistance. As it is at Such detector loops are often overhead lines, fixed resistance values can even be used are not specified, as the discharge of these lines depends to a large extent on weather and temperature is. However, an exact dimensioning of the individual switching elements is not possible with this, and with this known arrangement it cannot be avoided with certainty that at the same time Impulses from two triggered detectors come together in the control center and thus interfere with the correct recording of messages.

In order to exclude the disadvantages of the known arrangements of this kind, the present invention proposes that in the rest state contains the provided for influencing the triggering magnets ruhestromüberwa FRUITS S c hl Eife at the individual TWeTHSSteWeH "ηΤΤΓ'Πϋί the intended tripping of a detector actuated switch-over, by the When a detector is intended to be triggered, the part of this loop located behind the relevant reporting point is separated and it is passed over the triggering magnet of the relevant detector In order to ensure a triggering of a detector and thus a message output in the event of a faulty loop, the triggering magnets are expediently each with two symmetrical, at their connection points g equip earthed coils. In this case, the battery that feeds the trigger loop is defective

709 809/64

Claims (4)

Loop grounded in the middle by switching means indicating such a fault. The fact that when a detector is triggered at the reporting point, the part of the locking loop behind the triggering magnet of this detector is disconnected, ensures that only a single detector can run, regardless of the operation of the switching means provided in the control center. The disconnection of the blocking loop from its quiescent current source is carried out by switching means which are dependent on the message input, so that it is also ensured that the detector located at the detector receiving point was triggered before the blocking loop was disconnected. An embodiment of the invention is shown on the basis of the drawing. The detectors ME1 and ME2 are located in a closed-circuit current-monitored loop operated in a known manner in a Morse code safety circuit. They have impulse contacts controlled by cam disks / which, according to the number of cams on the respective cam disks, generate a series of impulses that are unique to each detector when the detector is running. These pulse trains are picked up by switching means Sa and Sb, not shown, and evaluated to control any display elements. While the message is being received, the delay relays VA and VB, not shown, respond in order to take over any control processes in the message receiving device. The blocking loop is fed from a battery Ba. This battery can be grounded via a contact sp3 of a fault indicator relay Sp in the middle. In the idle state, the two quiescent current monitoring relays Üa and Ub are energized, so that the relay Sp responds via the contacts Üa and Üb and keeps the contact sp3 open. The blocking magnets SpM are provided at the individual points of use of a detector, which when excited release the pulse contacts / controlling cam disks of the detector drive in a known manner. The coils are grounded in their center. The contacts spa and spb, via which the locking loop is switched through at the individual detector points, are switched over when a detector is intended to be triggered, and if the blocking magnet SpM can respond after this relocation of the contacts spa and spb, the Report submitted. The method of operation of the device is as follows: If a detector comes to an end, it places its blocking magnet SpM via the contacts spa and spb on the blocking loop before the start of the actual detector pulses and checks whether current flows from the control center via the blocking magnet. At the same time, by switching the contacts spa and spb, the part of the blocking loop located behind the respective detector point is switched off, so that if several detectors are triggered simultaneously or in quick succession, only the detector who is at the control center can send its message next lies. If current flows through the blocking magnet SpM, it responds and enables the detector to run completely. When the detector loop is interrupted for the first time, the relays Sa and Sb, not shown, drop out, and since the relays Va and Vb have responded during the input of the message, the relay M is energized. With its contacts m 1 and m2, this separates the blocking line for as long as the message input takes place on the part of the triggered detector. If another detector is triggered during this time, it remains blocked until the first message has been processed and the blocking line is switched back on to the battery Ba via the contacts m 1 and m 2. If several detectors have been triggered in the meantime, only the detector closest to the control center will ever start up, since the ones behind it are still without the power required for unlocking. The blocking line is closed-current controlled with the relays Üa and Ub via a terminal resistor EW. In the event of a wire break on the line, the relays Üa and Ub drop out and their contacts switch off the relay Sp. The contacts spl and sp2 cause the fault signal to respond, while the contact ^ 3 grounds the battery Ba in the middle. If a detector is now triggered, it is unlocked via the locking coil SpM, which is also located in its center in the safety circuit. Patent claims: 1. Signaling system with several drive signals arranged in a loop, which are triggered by a temporary excitation of triggering magnets that can be influenced via another loop Process can be released, characterized in that in the idle state to influence the release magnet provided closed-circuit current monitored loop at the individual reporting points only contains actuated changeover contacts when a detector is intended to be triggered the one behind the relevant reporting office when a detector is intended to be triggered Separated part of this loop and passed it over the trigger magnet of the detector in question will. 2. Signaling system according to claim 1, characterized in that the signal input via the actual detector loop dependent switching means (M) during the actual message input separate the loop provided for influencing the release magnets in the message receiving device. 3. Signaling system according to claim 1 and 2, characterized in that the release magnets each with two symmetrical coils that are earthed at their respective connection point. 4. Signaling system according to claim 1 to 3, characterized in that the battery feeding the triggering loop is grounded in the middle when the loop is disturbed by a switching means (Sp) indicating such a disturbance. Considered publications:
German patent specification No. 691 842. 1 sheet of drawings O 709 »09/64 12.57