DE102011002926B4 - Line monitoring of smoke switches - Google Patents

Abstract

Line monitoring of smoke switches (1) for locking devices for fire doors, at least two smoke switches (1) being electrically connected to one another, each smoke switch (1) having a smoke detector (2) and a signaling device (3) for triggering the locking device and for issuing an alarm, and wherein a connecting line (10, 10 ', 11) with lines for the voltage supply (10, 10') of the smoke switches (1) connected in parallel with respect to their voltage supply has a signal line (11) which is provided for triggering the detection device and alarm and which the Contacts of all signaling devices of the smoke switch (1) connects in a series circuit, a monitoring circuit (5) being provided which interacts with an end element (9) activated on the last smoke switch (1), characterized in that each smoke switch (1 ) has an end element (9) consisting of two resistors (9a, 9b) which are arranged in a row circuit between 0 V and the operating voltage, the resistors (9a, 9b) being electrically connected to one another and being electrically connected to the signal line (11) via a conductor track (19) via a deactivator (12), with all smoke switches ( 1) except for the last smoke switch (1) of the line monitoring, the conductor path (19) in the deactivator (12) is interrupted, so that the resistors (9a, 9b) represent a load for the operating voltage and the conductor path only in the last smoke switch (1) is intact, so that the voltage present across the respective resistor (9a, 9b) is detected and evaluated in the monitoring circuit (5).

Description

The invention relates to a line monitoring of smoke switches according to the preamble of claim 1.

From the DE 10 2008 028 631 A1 a line monitoring of smoke switches for detection directions of fire doors is known, wherein at least two smoke switches are electrically connected. Each smoke switch has a smoke detector and a signaling device for triggering the locking device and the alarm output. In this case, two supply voltage lines for supplying power to the smoke switch and a separate signal line for triggering the locking device and alarm are provided, wherein an end module cooperates with a monitoring module and monitors the lines for interruption, short circuit or resistance increase of the lines.

The DE 2 038 795 A discloses a fire alarm system with groupwise connected in parallel via common lines to an alarm center fire detectors, the lines are each bridged behind the line from a central furthest remote detector by a line monitoring serving end member, which is designed as a signal generator. A device provided in the center receives the signal emitted by the signal generator via the lines regardless of the quiescent or alarm current of the fire alarms and indicates in the absence of these signals to a line fault.

Other solutions are in the DE 10 2005 040 932 A1 . DE 40 39 483 A1 and the specification "Profibus-DP, 10.05.00, Kupke, N." described.

Changes in state of the line arrangement and the terminal points, for example due to corrosion, are not reliably detected.

A disadvantage is required in the art for line monitoring an additional end module to be installed.

The invention has for its object to provide a smoke switch, with which a line monitoring is possible in a simple manner.

The object is solved by the features of claim 1.

The subclaims form advantageous embodiments of the invention.

Smoke switches are used on locking devices provided with door closers fire doors use, with multiple smoke switches are interconnected. The fire doors are held by the locking devices in their open position and triggered in case of fire by a smoke switch, whereby close the fire doors. At the same time, an alarm is usually issued by an audible and / or visual detector.

Of the plurality of smoke switches, a first smoke switch may be disposed in a common housing with a monitoring circuit and a power supply. The monitoring circuit and the power supply can also be arranged in a separate housing or terminal box. There may be other elements such as relays, sirens or evaluation circuit, provided in the housing or externally.

Each smoke switch has a smoke detector and a signaling device, for example a relay whose contact is closed when there is no smoke detection. The contacts of all the signaling devices are connected in series and connected to the monitoring circuit, whereby the opening of a contact of a signaling device causes an alarm and the locking device is triggered.

All smoke switches are supplied with the required operating voltage via two power supply lines. For a safe function of the smoke switch, it is necessary that this operating voltage does not fall below a permissible value and the signal line reliably transmits an alarm signal. For this purpose, one or more end elements are provided, which interact with the monitoring circuit.

The arrangement of the end element or the end elements on the last smoke switch, the entire line arrangement is detected and monitored with all contact points, with an interruption or short circuit of one of the lines and damage or corrosion at the terminal points, which increases the electrical resistance of the respective line, be recorded.

End elements are provided in each smoke switch, which means that no components have to be inserted, for example soldered or clamped, on site at the last smoke switch. Also, no loosely attached components can be lost, which are provided for subsequent attachment. Since end elements may only be active at the last smoke switch of the connection line, the end elements of the other smoke switches can be deactivated simply by: a conductor of a circuit board arranged in the smoke switch is interrupted. This simple interruption of the track allows a functional assignment of the smoke switch with respect to the line monitoring.

In the following an embodiment in the drawing with reference to the figures will be explained in more detail.

Showing:

1 a schematic representation of an arrangement of several smoke switches with monitoring of the power supply and the signal line;

2 a smoke switch in the closed state;

3 a smoke switch in the open state;

4 a section of the smoke switch according to 3 ;

5 a section of the smoke switch according to 3 with broken conductor track;

6 a schematic representation of the electrical connections.

In 1 is a schematic representation of an arrangement of several smoke switches 1 shown how these are provided on locking devices of fire doors. The provided with door closers fire doors are held by a locking device in its open position and in case of fire through the smoke switch 1 triggered, which close the fire doors. At the same time, an alarm is usually issued by acoustic and / or optical detectors.

The smoke switch 1 be powered by a power supply 6 which are over the power line 7 supplied AC line voltage, for example, 230 V, converted into a DC voltage of 24 V here, and via the connecting line 10 supplied with operating voltage. Furthermore, a monitoring circuit 5 provided, which with one or more end elements 9 , in the simplest case, with electrical resistors, which interacts with the last smoke switch 1 are arranged. An end element 9 but can also be a circuit arrangement which consists of several, optionally also active components. The monitoring circuit 5 is also from the power supply 6 provided. The locking device and alarm are with a connecting cable 8th to the monitoring circuit 5 connected.

The monitoring circuit 5 and the power supply 6 are in a separate housing 4 or terminal box arranged. There may be other elements in the housing 4 or be provided externally, such as a siren, an evaluation circuit or another relay for switching the locking device. In addition to the monitoring circuit 5 , the power supply 6 and possible other elements may be in the housing 4 also a first smoke switch 1 be arranged.

Every smoke switch 1 has a smoke detector 2 and a signaling device 3 , For example, a relay on. At rest, there is no smoke detection, and the contact of the signaling device 3 is closed. The contacts of all signaling devices 3 are connected in series and via a signal line 11 the connection line 10 to the monitoring circuit 5 and connected. The tripping by opening the contact of the signaling device 3 one of the smoke detectors 1 causes an alarm and a triggering of the locking device.

For a safe function of the smoke switch 1 it is necessary that the operating voltage does not fall below a permissible value, for example 20 V. Likewise, it is required that it is ensured that the signal line 11 reliably transmits an alarm signal. Since usually the connecting line 10 from smoke switch 1 to smoke switch 1 is guided at each smoke switch 1 Terminals for connection present, wherein the clamp connection may not be reliable and may have a break or a poor contact.

By the arrangement of the end elements 9 at the last smoke switch 1 the entire line arrangement with all contact points can be recorded and monitored. It should be noted that only at the last smoke switch 1 these end elements 9 be effective.

To simplify the installation of several smoke switches 1 formed arrangement is every smoke switch 1 with end elements 9 provided, causing the smoke switch 1 are advantageously constructed identically inexpensive. According to the invention at the smoke switches 1 on which the end elements 9 not be effective, the end elements 9 easy and fast with a deactivator 12 who is also in every smoke switch 1 exists, be made ineffective.

The 2 and 3 show one of the smoke switches 1 which, for example, on the lintel or the building ceiling by means of screws not shown in the figures, the slots 13 of the housing 14 of the smoke switch 1 be upheld be attached. The housing 14 includes a recording room 15 in which a circuit board 18 is arranged on which the required components, in particular the smoke detector 2 , the signaling device 3 , the end elements 9 , the terminals and the deactivator 12 are arranged and the wiring is realized.

The housing 14 also has a recess 16 to access the in the recording room 15 arranged circuit board 18 on, with the recess in the area of the deactivator 12 is provided. The recess 16 can by means of a tool 17 for handling the deactivator 12 be penetrated. By way of example, a screwdriver is shown here, wherein the tool 17 , depending on the type of deactivator 12 also a scratching tool, tweezers or the like can be.

In the embodiment, the deactivator 12 as breakable conductor track 19 trained, which can be broken with the screwdriver. In the 3 is the recording room 15 of the smoke switch 1 open, showing the engagement of the tool 17 in the deactivator 12 is shown.

The 4 and 5 each show a section of the open recording room 15 with the circuit board 18 in the area of the deactivator 12 , The conductor track 19 the circuit board 18 is over a jetty 20 of the deactivator 12 guided, with both sides of the bridge 20 the circuit board 18 breakthroughs 21 in which the tool 17 introduced and the jetty 20 can be leveraged. These can be constrictions 22 at the jetty 20 be available, which as breaking points breaking the web 20 favor. In 5 is the jetty 20 of the deactivator 12 broken out and the conductor track 19 thus interrupted. It is also conceivable, the deactivator 12 as a scratching bridge or as a switching element in the form of a jumper, a detachable wire bridge or a DIP switch form.

In 6 the electrical connection is shown schematically, wherein as end elements 9a . 9b Resistors are provided. The connection line 10 includes the supply lines 0 V and 24 V for the operating voltage and the signal line 11 , The first end element 9a is connected at one end to 0 V of the operating voltage and the second end element 9b is connected at one end to the 24 V operating voltage. The end elements 9a . 9b at the other end are electrically connected to each other and together via the track 19 over the deactivator 12 with the signal line 11 connected, as is the case for the last smoke switch 1 to ensure line monitoring is required.

Furthermore, in the 6 it can be seen that in the other connected smoke switches 1 the conductor track 19 in the deactivator 12 is interrupted. The end elements 9a . 9b are thus arranged in a series connection between 0 V and 24 V operating voltage and have no connection to the signal line 11 , The end elements 9a . 9b thus represent only a load for the operating voltage, the load is advantageously kept low by selecting a high resistance value.

In the case of the last smoke detector 1 is through the intact track 19 each between the signal line 11 and 0 V and 24 V, respectively, an end element 9 arranged, whereby the voltage applied across the respective resistor can be detected. Thus, the connection can be from 0 V via the connection line 10 and every smoke detector 1 back to the signal input of the signal line 11 at the monitoring circuit 5 and 24 V via the connection line 10 back to the signal input of the signal line 11 at the monitoring circuit 5 take place where this connection is detected and evaluated.

By the arrangement of the end elements 9a . 9b is by simply interrupting the trace 19 a functional assignment of the smoke switch 1 regarding line monitoring possible. It must be inserted on site no components, for example, soldered or clamped. Also, no loose enclosed components, which are intended for subsequent attachment, get lost.

LIST OF REFERENCE NUMBERS

1

smoke switch

2

smoke detector

3

signaling device

4

casing

5

monitoring circuit

6

power supply

7

power line

8th

connecting cable

9, 9a, 9b

end elements

10

connecting line

11

signal line

12

deaktivator

13

Long hole

14

casing

15

accommodation space

16

recess

17

Tool

18

circuit board

19

conductor path

20

web

21

breakthrough

22

constriction

Claims (9)

Line monitoring of smoke switches ( 1 ) for locking device of fire doors, whereby at least two smoke switches ( 1 ) are electrically connected to each other, each smoke switch ( 1 ) a smoke detector ( 2 ) and a signaling device ( 3 ) for triggering the locking device and for alarm output, and wherein a connecting line ( 10 . 10 ' . 11 ) with lines for power supply ( 10 . 10 ' ) of the parallel connected to their power supply smoke switch ( 1 ) a signal line ( 11 ), which is provided to trigger the locking device and alarm and the contacts of all signaling devices of the smoke switch ( 1 ) in a series connection, wherein a monitoring circuit ( 5 ) provided with an end element ( 9 ) at the last smoke switch ( 1 ) is activated, cooperates, characterized in that each smoke switch ( 1 ) an end element ( 9 ) consisting of two resistors ( 9a . 9b ), which are arranged in a series circuit between 0 V and the operating voltage, wherein the resistors ( 9a . 9b ) are electrically connected to each other and via a conductor track ( 19 ) via a deactivator ( 12 ) with the signal line ( 11 ) are electrically connected, wherein in all the smoke switches ( 1 ) except for the last smoke switch ( 1 ) the line monitoring the trace ( 19 ) in the deactivator ( 12 ) is interrupted so that the resistors ( 9a . 9b ) represent a load for the operating voltage and only in the last smoke switch ( 1 ) the track is intact, so that the voltage across the respective resistor ( 9a . 9b ) in the monitoring circuit ( 5 ) is recorded and evaluated. Line monitoring according to claim 1, characterized in that the end element ( 9 ) and the deactivator ( 12 ) on a printed circuit board ( 18 ) of the smoke switch ( 1 ) are arranged. Line monitoring according to one of the preceding claims, characterized in that the smoke switch ( 1 ) a housing ( 14 ) with a receiving space ( 15 ), wherein the receiving space ( 15 ) a recess ( 16 ) for the penetration of a tool ( 17 ) having. Line monitoring according to claim 3, characterized in that by means of the tool ( 17 ) the deactivator ( 12 ) is operable. Line monitoring according to one of the preceding claims, characterized in that the deactivator ( 12 ) a footbridge ( 20 ) with a conductor track ( 19 ). Line monitoring according to claim 5, characterized in that the web ( 20 ) through breakthroughs ( 21 ) of the printed circuit board ( 18 ) is formed. Line monitoring according to claim 5, characterized in that the web ( 20 ) Constrictions ( 22 ) having. Line monitoring according to claim 5, characterized in that the web ( 20 ) by means of the tool ( 17 ) for interrupting the conductor track ( 19 ) is breakable. Line monitoring according to claim 1, characterized in that the deactivator ( 12 ) is a switching element or a scratching bridge.

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