DE691842C - Signal system with several detectors lying in parallel on a double line, in particular a fire alarm system - Google Patents

Description

Signal system with several * lying in parallel on a double line Detectors, in particular fire alarm systems There are signal systems, in particular fire alarm systems, known, in which the line network according to the so-called radiation system using is made up of double lines. With such systems, in particular come into question if there is a larger one in certain directions from the control center Number of detectors is to be connected, the individual detectors are parallel on a double line.

In such systems it is difficult to establish a mutual To achieve blocking of the detectors, which is necessary to prevent-bei two detectors pulled almost simultaneously and the messages interfere with each other.

Arrangements are already known for long-distance telephone traffic those using a larger number of control lines several to -the same Telephone sets connected to the exchange line are blocked; as long as the trunk is busy by one of the subscribers. In such telephone systems However, the requirement does not arise that automatically, as is the case with signal systems is required, a set message after a previous message has expired is sent. Especially with signal systems where this requirement is flawless must be met is through appropriate training of the locking devices for it To ensure that interferences between the messages are avoided.

The invention relates to a locking arrangement which makes it possible in an impeccable way a blocking of the detectors mutually to carry out so that; as soon as one detector has been pulled, a second pulled detector will only expire can after the first; Reporter has submitted his report.

With such systems it is f, @@ i @ y to ensure that a block in every every 1 "d) rt .. occurs, regardless of whether the detector pulled in pairs from the control center is in front of or behind the first detector pulled. In any case, it should be ensured that after the first detector has expired, the second message is also properly recorded in the headquarters. this will according to the invention achieved in that before the second message is issued, depending on depending on the mutual position of the pulled detectors, two different ones that can be switched on one after the other Locking organs are brought into effect. The first test determines whether there is a detector that is behind the two-man puller, as seen from the control center, already submits a message. If this is not the case, a second takes place Test to determine whether a detector closer to the control center is already in Activity has been set. Only after completing these two exams will yan the actual alarm signal is transmitted to the control center via the alarm drive. However, it was another detector has already been pulled; the alarm trolley is locked for so long until after the previous detector has expired, there is now also an expiry of the two-person one actuated detector can take place.

The system according to the invention is based on an exemplary embodiment explained in more detail below.

The detectors are located in a double line from the control center Z. 1V1 to 111l4. The orders required in the head office to record the report are not shown in detail because they are not essential to the concept of the invention and any known receiving arrangement, e.g. B. -according to the Morse safety circuit; Can be used. The double line is on your remote from the control center End closed via a resistor Wi, which is set so that in the line only a quiescent current flows. which is just enough for loop monitoring. Of the Quiescent current, however, is so small that it normally causes the in the line short-circuited blocking magnets Sp even after the short-circuit has been removed - not for Address can be brought.

It is assumed that the detector M2 is actuated first. When the detector is triggered, the impulse is not started immediately, but the detector initially has a so-called lead. During this advance, the short circuit for the two windings I and II of the blocking magnet Sp is canceled in that the contacts 1. and a2 are opened. As mentioned above; However, the blocking magnet cannot respond via the closed-circuit current flowing over the C: line, so that the detector continues to run. Then, as the alarm system runs down, the changeover contacts b1 and b2 are switched over, by means of which the line loop located behind the alarm 1112 is separated. Instead of this line loop, the two windings I and II of the starting magnet A11I are connected to the line.

As soon as the contacts b1 and b2 have been turned over, it takes place mechanically a locking of the detector drive. Because the resistance of the windings of the starting magnet A: 11 is smaller than the resistance Wi, the starting magnet-A11d can respond come, releases the detector again, and a signal is now given via the drive to the control center by actuating the pulse contact ik.

If the detector Ml is actuated while the detectorM2 is running, so In the case of detector 11! 1l, the short circuit for windings I and II is also initially of the blocking magnet Sp canceled. There is an increased quiescent current through the line loop as a result of the activation of the starter magnet AM in the detector 1112 flows, the Locking magnet Sp of the detector Ml to respond and prevents mechanically in this way another expiration of the detector. The locking magnet is with a dropout delay provided, which is so large that the magnet even with the longest loop interruption does not fall off during the submission of a report. Only when the detector Dill has submitted his message and thereby the contacts a1, a2, br, b2 back into the The rest position have decreased, the. Locking magnet Sp of detector AI, drop out, when the closed circuit again runs across the resistor Wi. The M1 detector is running now continue, with all processes as described above for detector 11112, play.

It is now assumed that while detector D112 is running, a detector located behind it, for example detector M4, is activated. When this detector expires, the short-circuit for windings I and II of the blocking magnet Sp is first canceled by opening the contacts a and a2. However, since the loop line has been interrupted via the contacts b1 and b2 of the detector 11I2, the blocking magnet cannot respond, so that the detector M4 continues to run. The contacts bi and b2 of the detector M4 are switched over and the drive is mechanically locked. Because of the aforementioned loop interruption, the starter magnet AM cannot respond, so that the detector remains locked. Only when the detector M2 has submitted its message and the line loop is switched through to the detector M4 again by switching back the contacts b1 and b2, the starter magnet AM in the detector 114 is activated and releases the detector so that it can use its pulse contact ik the Can transmit message to control center Z.

The aforementioned embodiments show that in each case, independently from the position of the detectors to each other, a perfect mutual blocking is carried out will.

In the event of a ground fault, the case now occurs that the blocking magnet is one before The actuated detector lying at the ground fault is kept permanently in the attracted state so that this detector cannot send its message. To this disadvantage To avoid this, the loop is de-energized at regular intervals by a switching mechanism made. The interruption times are chosen so that the locking magnet during the Power interruption can drop, so that now the detector send its message can. The switching mechanism that causes the loop interruption is useful here made dependent on the earth connection control device to be provided in the control center, so that z. B. automatically when a ground fault occurs, the switchgear in action is set.

Claims (7)

PATENT APPLICATION III :: i. Signaling system with several detectors lying in parallel on a double line and connected to a control center via this double line, of which only one transmits the current impulses via the double line to the control center, in particular fire control system, with the switching off of the Met located behind it in that two monitoring devices can be made one after another effective by each actuated detector, of which the first effective (Sp) at a through flow of a previously triggered -. other hand, "and underlying detector which thereafter effective (AM) at a through the outlet A current change in the line caused by an existing detector blocks the further detector process. 2. Signal system according to claim i, characterized in that that "when a detector is triggered, a blocking magnet is switched into the line which is only caused by the sequence of a detector behind it Current-. increase responds. 3. Signal system according to Claim i and 2, characterized in that that the locking magnet is permanently in the line and in the idle state of the detector is short-circuited by contacts actuated by the drive. 4. Signal system after Claim i to 3, characterized in that the blocking magnet has a drop-out delay that is greater than 'the longest loop interruption during a message delivery. 5. Signal system according to claim i to 4, characterized in that the detector at his further sequence switching contacts actuated, which are connected to the other detectors Interrupt the leading line and connect it to a starting magnet on the detector. 6. Signal system according to claim i to 5, characterized in that the detector = drive is mechanically blocked until the starter solenoid responds. 7. Signal system after Claim i to 6, characterized in that the detector drive only after your When the starter magnet is triggered, the pulse contact used for signaling is actuated. Ä. Signal system according to claims i to 7, characterized in that in the event of a ground fault the line from the head office is interrupted at regular intervals.