DE1036116B - Electrical control device for room protection systems - Google Patents

Description

GERMAN

It is known to provide room protection systems with separate monitoring devices to prevent malfunctions, which could call the work of the system into question, to display at any time. Most of them These facilities have the disadvantage that a special reporting facility and for each contact therefore special connection lines are also required. If this effort is not acceptable, then there is although the possibility of continuously monitoring certain signaling circuits. To reduce the In terms of circuitry, expenditure was assigned to the individual reporting circuits in known security systems Switches are provided for both commissioning and control of the security system to serve. Such switches can be designed such that they functionally several Can replace single switches. The operation of such switches is similar to that of tube testers is known, whereby control positions are inevitably carried out before the "Measure" position. In the case of tube testing devices, appropriate display means can be used in the control positions, for example existing errors, for example short electrodes, are displayed. All previously known measures however, these types are generally aimed at simplifying operation. Of the However, the invention is based on the object in room protection systems, especially an increase in the To achieve operational safety. This can only be made possible when the Room protection system, an actual function check is also carried out. So it's supposed to be an electrical check the system can be carried out both for the idle state and for the alarm case, so that any intervention or condition that would call into question a later triggering of the alarm, as soon as the device is switched on the security system can be recognized as such. This exam is particularly important. If the electrical fuse circuits are completely in order, but due to mechanical interlocking one of the relays effective in the event of an alarm makes it impossible to trigger the system.

The task set is included in a bridge circuit for a capacitive room protection system Measuring electrodes achieved according to the invention in that one of the various control functions carrying out test device working with auxiliary relays In addition to the switch positions »On« and »Off«, several more when the system is switched on has compulsory control positions in which the operational readiness of the system for the idle and alarm state, e.g. B. the sensitivity and bridge tuning position of the measuring circuit or the switching status of the avoidance loops,

Electrical control device
for room protection systems

Applicant:
Siemens & Halske Aktiengesellschaft,

Berlin and Munich,
Munich 2, Wittelsbacherplatz 2

Dipl.-Ing. Ulrich Biederstedt and Herbert Seiler,
Munich,

have been named as inventors

- ■ - ·

checked and the result of the check reported. The test result can be divided into two Relay arrested and system malfunction at the end of the test when the door was closed Alarm triggering must be identified. It is useful to display the error-free test process Provide a separate signal lamp when the door is open.

Further features of the invention can be seen from the following description of one in the drawing illustrated embodiment.

The drawing shows the basic circuit diagram of the control device, with two message loops, with correspondingly assigned message receivers El un, d

£ 2 are provided. ■ - '

The control device can also be provided for a larger number of loops without additional effort. The message receivers are devices that work on the principle of a capacitance measuring bridge, the bridges capacitances C _am and C _{bm being formed} by the electrical fields of the electrodes a, m and b, which are to be attached so that their fields are the Fill in the space to be protected.

The functional check is carried out with a test switch, not shown, which can assume positions I to IV. Position I corresponds to the state of the switched-off system, positions II and III to the control positions and position IV to the operating position of the room protection system. In test position II, contacts w2 and w 6 are closed. In this switching position, it is checked whether the α-contacts, which lie in the detection loops MSl and MS2 are opened correctly, ie

809 580/64

can interrupt the reporting loops. For this test, it is necessary that the operative existing excitation of lying on the bridge excitation voltage relay Al and A2 does not exist, which is achieved through the still open in this test position wl contact. When the zc / 2 contact is closed, the negative pole of the operating voltage Ul is applied to the message loops MS1 and MS2 . Thus the Loop Relay speak Sl and 6 * 2 through the windings 5 "I _1-2 and S2 _t _ ₂ and check so that all α-contacts have properly broken. In order to control serve the associated loop lamps Ll and L2 in response the corresponding loop relay light up via the following current path:

Ul, Ll, si ¹¹ , earth.
Ul, L 2, j2 ", earth.

(la)
(Ib)

The correct state is recorded by the X relay.

- Ul, X ₃ . _it w6, sl ^m , i2 ^m , earth. (2)

After the X relay has picked up, it will hold itself through its own .a ^ contact. The ^ "contact, which is still activated, prepares the F-relay to be switched on so that the anode voltage (72) is maintained in the later control positions of the switch the receivers El and £ 2. The X relay can only pick up when all S contacts have closed.

In the event of a malfunction z. B. the al contact does not have the associated reporting loop. In this case, the loop relay SI does not pick up, the loop lamp Ll does not light up, and the X relay cannot ^{pick up} since the loop contact λ1 πι remains open. The error must be eliminated or the faulty loop must be switched off. For this purpose, a switch (not shown) can be provided which separates the loop in question.

In control position III, the i-contacts are checked for proper function when the α-contacts are closed. For this purpose, the switching contacts wl, iv2 and w5 are closed. This means that the bridge feed transformer Tr receives electricity. A charging current surge occurs via the folded w5 contact and the capacitor Ci , which causes the pulse relay / to respond briefly. The i-contact switches result briefly the voltage Ul with the bridge supply voltage U 3 in number, are started whereby the relay ^. Each ^ 4 relay is dimensioned in such a way that the armature can be held straight by the back feed voltage [73, but this voltage is not sufficient for the relay to respond. A reduction in the bridge feed voltage f / 3, which would make the receivers less sensitive, is reported by the vi relay dropping out.

While the ^ relay is placed parallel to the bridge supply voltage UZ in order to monitor it, the T relay is located in a compensation circuit between the bridge voltage Uv, which is amplified by a tube Rö , and a compensation voltage Uk. When the alarm is ready, both voltages are balanced in such a way that the T-relay does not receive any excitation current. Since in control position III the anode voltage i / 2 is ^{still missing because of the open 3 / n} contact, only the compensation voltage Uk is effective at the T-relay, the T-relay therefore responds. The painting loops MS1 and MS2 are interrupted by the contacts ti and i2. While the relay windings -Sl _1-2 and 51 ₃ . ₄ or S2 _V2 and S2 _{3 <} cancel each other out, the separation of the ^{message loops means that only the windings 5 1} I _1-2 or 5 "2 ^ _{2 come} into play, and the 5" -ReIaJS attract. The loop lamps Ll and L 2 thus light up as a sign that the T-relay is working properly. If the lamp display does not appear, this indicates a fault that can be in the T-relay itself or in the compensation circuit. In the control position IV, the switching contacts wl to w5 and w7 are closed. The test is continued in this position, which also corresponds to the operating position. If the i-contacts in control position III had interrupted the assigned message loops, then the 5 relays could pick up. The correct condition of the system is now recorded by the F-relay responding via the following current path:

-Ul, Y, x ¹¹ , wl, si ¹¹¹ , s2 ^m , earth.

(3)

The anode voltage U2 is now operationally applied to the receivers E1 and E2 via the y ^{n contact.} The conditions in the compensation branch, which depend on the bridge tuning position and the gain factor, are now checked in the receivers. If both influencing variables are normal, the T-relays drop out. The 6 "relays also drop out because the i-contacts close the signaling loops. The loop lamps Ll and L2 therefore go out.

To check that the test is running correctly, the signal lamp B lights up:

- Ul, signal lamp B, g, ze / 4, door contact tk ⁿ , al, earth. (4)

The signal lamp B can only be lit when the G relay has dropped out. This is only the case when the y-contact has opened, ie when the test carried out in control position III has proceeded properly. The y relay could only pick up if the X relay had previously picked up in control position II. The correct coordination of the recipients £ 1 and £ 2 is continuously checked in the operational division. The room protection system can only be brought into the alarm-ready idle position by closing the door, without the alarm being triggered, only when the signal lamp B is on, indicating that the function control is running properly. In this case the signal lamp B goes out because the door contact tk ^lv and tk ^l open. The door contact tk ^m short-circuits the resistor Rs. The excitation of the 5 * relay via the winding S ₁ ^ is so strong that in the event of an alarm the 5 relays no longer drop out, even if they have picked up due to a brief interruption in the message loops. In the event of an alarm, the ^ / - relay pulls z. B. via the following current path:

-Ul, Al, tk ^u , si ¹ , earth.

(5)

The a / contact thus switches on the alarm clock AW . At the same time, the corresponding loop lamp is switched on by the ^ "contact to indicate the corresponding loop. The mandatory function check is independent of whether the loop lamps, which enable the detection of the faulty loop in the test positions, were observed during the control If lamp B is ignored, the system can only be switched on permanently without an alarm being given immediately

if all functional checks are error-free passed.

Claims (4)

Patent claims: 1. Electrical control device for capacitive room protection systems with in a bridge circuit included measuring electrodes, characterized in that one of the various control functions carrying out test device working with auxiliary relays next to the switch position "On" and "Off" are several more that must be taken when the system is switched on Has control positions in which the operational readiness of the system for the Idle and alarm status, e.g. B. the sensitivity and bridge tuning position of the measuring circuit or the switching status of the message loops, checked and the result of the check reported will. 2. Electrical control device according to claim 1, characterized in that two relays (X and F) are provided which record the result of the test and identify errors in the system at the end of the test when the door is closed by triggering an alarm. 3. Electrical control device according to claim 2, characterized in that a signal, for. B. a lamp (B) is used. 4. Electrical control device according to claim 3, characterized in that during the test the state of the system can be recognized by a signal lamp (Ll and L 2) assigned to each loop. Considered publications:
German Patent No. 837 524;
Progress in radio technology, Volume 2, 1937, p. 54, Frank'sche Verlagshandlung Stuttgart. 1 sheet of drawings 1 809 580/64 7.5 *