JP2019125392A - Power unit for first equipment and alarm system - Google Patents

Abstract

To provide a power unit for first equipment which blocks occurrence of an alarm that wiring with the first equipment is disconnected when the alarm that the wiring is disconnected is unnecessary without interposing the power unit for the first equipment for connection between the first equipment and the receiver, and an alarm system with the power unit for the first equipment.SOLUTION: In a power unit for first equipment which can relay a signal from the first equipment to a receiver by supplying power to the first equipment and being interposed between the first equipment and the receiver, it is provided with: a pair of first terminals which can be connected with the first equipment via first wiring; a reception terminal which can be connected with the receiver via reception wiring; a reception disconnection monitoring circuit which is connected with the reception terminal to monitor disconnection of the reception wiring; and a pseudo terminal resistor which is connected between the first terminals when non-connection of the reception wiring is confirmed in the reception disconnection monitoring circuit.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a first device power supply device for supplying power to a first device and an alarm system provided with the first device power supply device.

  Conventionally, a wireless relay that relays a wireless sensor and a receiver is known. Patent Literature 1 discloses a disaster prevention monitoring system including such a wireless relay (a relay for wireless reception). In Patent Document 1, the wireless relay receives supply of DC power from a receiver through a power supply line.

  In addition to this, an alarm system is also known in which a power supply device for a wireless relay is separately provided as a power supply of the wireless relay. In this case, the power supply device for the wireless relay may be interposed between the wireless relay and the receiver, and may have a function of relaying a signal from the wireless relay to the receiver. In this case, the power supply device for the wireless relay and the wireless relay are connected by a power supply wire, while the wireless relay and the receiver are connected via the power supply device for the wireless relay. Connected by). However, there are also cases where the wireless relay and the receiver are directly connected by wiring without using the wireless relay power supply device while using such a wireless relay power supply device.

  A terminal resistor is connected to the end of the wiring between the wireless relay and the wiring for the purpose of monitoring the disconnection of the wiring between the wireless relay and the wiring. The power supply apparatus for a wireless relay device is provided with a circuit for monitoring the disconnection of the wiring, and this circuit detects a weak current based on the termination resistance flowing in the wiring and detects that the weak current has stopped flowing. If it detects, it will be judged that the said wiring was disconnected. In this way, the circuit monitors for wire breaks between the wireless repeaters. Then, when disconnection of the wiring is confirmed, an alarm indicating that the wiring is disconnected is output.

JP, 2011-96169, A

  However, when the wireless relay and the receiver are directly connected by wiring without passing through the power supply device for wireless relay, the wireless relay and the power supply device for wireless relay are not connected by wiring. The weak current can not be detected, and the circuit that monitors the disconnection of the wire determines that the wire is disconnected. For this reason, since the wireless relay and the receiver are directly connected by wiring, since there is essentially no disconnection, there is no need to warn that the wiring between the wireless relay and the wireless relay has been disconnected. , An alert will be output.

  The present invention has been made to solve the problems as described above, and the wiring between the first device and the receiver is not performed via the first device power supply device, but the wiring between the first device and the first device is made. To provide a first power supply for the device and a warning system including the power supply for the first device, which shuts off the generation of the alarm indicating that the wire is broken when the alarm indicating that the wire is broken is unnecessary. It is.

  The first device power supply device according to the present invention supplies power to the first device, intervenes between the first device and the receiver, and relays the signal from the first device to the receiver In the power supply device for the first device, a pair of first terminals connectable to the first device via the first wiring, and a reception terminal connectable to the receiver via the reception wiring And a reception disconnection monitoring circuit connected to the reception terminal to monitor disconnection of the reception wiring, and a pseudo termination resistor connected between the first terminals when disconnection of the reception wiring is confirmed in the reception disconnection monitoring circuit. , And.

  According to the present invention, the pseudo termination resistor is connected between the first terminals when disconnection (non-connection) of the reception wiring is confirmed in the reception disconnection monitoring circuit. Therefore, even if the first wiring is disconnected (even if the first wiring is not connected), the first device power supply device can block the occurrence of the disconnection alarm of the first wiring. Therefore, the fact that the wiring (first wiring) between the first device and the first device is broken, such as a form in which the first device and the receiver are directly connected by the wiring without passing through the first device power supply device. When the alarm of (1) is unnecessary, it is possible to shut off the generation of an alarm indicating that the wiring is broken.

It is a block diagram showing alarm system 2 concerning Embodiment 1 of the present invention. FIG. 1 is a block diagram showing a power supply device 1 for a wireless relay according to Embodiment 1 of the present invention. It is a block diagram showing alarm system 2 concerning Embodiment 1 of the present invention.

  Hereinafter, embodiments of a power supply device 1 for a wireless relay device and an alarm system 2 according to the present invention will be described with reference to the drawings. The present invention is not limited by the embodiments described below. In addition, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one.

Embodiment 1
FIG. 1 is a block diagram showing an alarm system 2 according to Embodiment 1 of the present invention. The alarm system 2 will be described based on FIG. As shown in FIG. 1, the alarm system 2 includes a wireless sensor 3, a wireless relay 4, a receiver 5, and a power supply device 1 for wireless relay. The wireless sensor 3 is, for example, a fire sensor that senses smoke or the like. The wireless sensor 3 is not directly connected to the receiver 5 in a wired manner, and transmission and reception of a fire signal and the like are performed wirelessly via the wireless repeater 4.

  The wireless relay 4 wirelessly transmits and receives signals to and from the wireless sensor 3, and transmits the signal received from the wireless sensor 3 to the receiver 5 through a wire. In the first embodiment, the wireless relay 4 transmits a signal to the receiver 5 via the wireless relay power supply device 1.

  The receiver 5 performs notification of a fire alarm or the like based on the signal received from the wireless relay 4. In the first embodiment, the receiver 5 receives a signal from the wireless relay 4 via the wireless relay power supply device 1. The receiver 5 receives, for example, an AC power supply of 100V. The receiver 5 may be a relay for notification of fire or the like.

  The power supply device 1 for the wireless relay supplies power to the wireless relay 4, intervenes between the wireless relay 4 and the receiver 5, and transmits the signal from the wireless relay 4 to the receiver 5. It is to relay. For example, an alternating current power supply of 100 V is input to the wireless relay power supply device 1, and in addition, a standby power supply 14 is also connected. Here, the wireless relay power supply device 1 further includes a power supply voltage monitoring circuit (not shown). The power supply voltage monitoring circuit is connected to, for example, a power supply circuit 26 (FIG. 2) to which an AC power supply is input, and measures a voltage output from the power supply circuit 26. At normal times, the wireless relay power supply device 1 is driven by power supply based on AC power. If the voltage measured by the power supply voltage monitoring circuit falls below the predetermined voltage, it is determined that the power supply based on the AC power supply has stopped, and the power supply device 1 for wireless system relay is driven from the AC power supply to the standby power supply 14 It is switched. Thus, the wireless relay power supply device 1 is driven by the standby power supply 14.

  The power supply device 1 for the wireless relay and the wireless relay 4 are connected by a pair of power supply lines 13, and the power supply device 1 for the wireless relay uses the power supply wire 13 to supply power to the wireless relay 4. Supply. Further, the wireless relay power supply device 1 and the wireless relay 4 are connected by a pair of relay wires 11, and the wireless relay power supply device 1 uses the relay wire 11 to connect the wireless relay 4. Send and receive signals between This signal is, for example, a fire signal or the like received by the wireless relay 4 from the wireless sensor 3.

  Furthermore, the wireless relay power supply unit 1 and the receiver 5 are connected by a pair of reception wires 12, and the wireless relay power supply unit 1 is connected to the receiver 5 using the reception wiring 12. Send and receive signals. This signal is, for example, a fire signal or the like received from the wireless relay 4 by the wireless relay power supply device 1. The wireless relay power supply device 1 has a function of transferring various types of abnormality information to an external device.

  The wireless sensor 3 transmits a fire signal when a fire is detected by smoke or the like.

  Further, although not shown, in the wireless relay 4, the normally open first switching element and a resistor (for example, 100 Ω) for adjusting the alarm current are connected in series to connect between the relay wires 11 shown in FIG. A switching circuit is connected in parallel to a relay termination resistor 15) described later. This switching circuit has the same configuration as the switching circuit (described later) of the power supply device 1 for the wireless relay. Then, when the wireless relay 4 receives a fire signal from the wireless sensor 3, the switching circuit is operated by closing the first switching element to adjust the alarm current as fire information (fire signal). The circuit operates to flow a substantially short circuit current based on the resistance of the relay wire to the relay wiring 11.

  FIG. 2 is a block diagram showing a power supply device 1 for a wireless relay according to Embodiment 1 of the present invention. As shown in FIG. 2, the wireless relay power supply device 1 includes a pair of relay terminals 21, a pair of reception terminals 22, a reception disconnection monitoring circuit 23, and a pseudo termination resistor 24. Furthermore, the wireless relay power supply device 1 includes the relay disconnection monitoring circuit 25, the power supply circuit 26, the control circuit 27, the power supply terminal 28, the termination terminal 29, the LED 31, and the wiring terminal block 32. .

  The relay terminal 21 is connected to the wireless relay 4 via the relay wiring 11. The reception terminal 22 is connected to the receiver 5 via the reception wiring 12. The reception disconnection monitoring circuit 23 is connected to the reception terminal 22 to monitor disconnection (and / or non-connection) of the reception wiring 12. The reception disconnection monitoring circuit 23 determines the disconnection (and / or non-connection) of the reception wiring 12 based on the presence or absence of the current flowing to itself (photocoupler), and if the current does not flow, the reception wiring 12 is disconnected (and / or non-connection). It is judged that it is connection.

  The pseudo termination resistor 24 is connected between the relay terminals 21 when disconnection (and / or non-connection) of the reception wiring 12 is confirmed in the reception disconnection monitoring circuit 23. The pseudo termination resistor 24 is connected between the relay terminals 21 to be simulated as a termination resistor in place of the relay termination resistor 15 (described later) connected to the wireless relay 4. The pseudo termination resistor 24 is, for example, 10 kΩ. The pseudo termination resistor 24 is connected in series with a normally open first switching element 41.

  The relay disconnection monitoring circuit 25 is connected between the relay terminals 21 and monitors a disconnection of the relay wiring 11. The relay terminal resistance 15 for disconnection detection connected to the terminal end of the relay wiring 11 is connected to the wireless relay 4 and is, for example, 10 kΩ. The relay disconnection monitoring circuit 25 detects a weak current based on the relay termination resistor 15 flowing to the relay wiring 11, and when detecting that the weak current no longer flows, determines that the relay wiring 11 is disconnected. Thus, the relay disconnection monitoring circuit 25 monitors the disconnection of the relay wiring 11. Then, when disconnection of the relay wiring 11 is confirmed, a relay disconnection alarm (described later) indicating that the relay wiring 11 is disconnected is output.

  The relay disconnection monitoring circuit 25 also has a function of detecting a fire signal or the like received from the wireless relay 4 and transmitting it to the control circuit 27. Here, the relay disconnection monitoring circuit 25 detects a substantially short circuit current flowing through the relay wiring 11 based on the switching operation of the wireless relay 4 and determines that a fire signal is detected when it is determined that the substantially short circuit current flows. to decide.

  A circuit for detecting a fire signal may be provided separately from the relay disconnection monitoring circuit 25 as a relay fire monitoring circuit.

  The power supply circuit 26 receives the power supplied from the AC power supply after transforming it with a transformer, converts this power into a predetermined power, and sends it to the relay disconnection monitoring circuit 25 and the control circuit 27. Output. The relay disconnection monitoring circuit 25 and the control circuit 27 are configured to be supplied with power also from the standby power supply 14. The control circuit 27 transmits abnormality information or fire information to the receiver 5 based on the signal received from the relay disconnection monitoring circuit 25. Further, the control circuit 27 transmits the abnormality information or the fire information to the LED 31. The pair of power supply terminals 28 are connected to the wireless relay 4 via the power supply line 13. A fuse is attached to the power supply terminal 28. Further, the power supply device 1 for wireless relay is provided with a panel switch 14a, and when the panel switch 14a is pressed, the battery test circuit 14b is driven to perform a voltage test of the standby power supply 14.

  The pair of termination terminals 29 is connected to the termination 16 for detecting disconnection of the reception wiring 12 by the receiver 5. The termination 16 may be a termination resistor, and the resistance value may be similar to that of the relay termination resistor 15 and the pseudo termination resistor 24 and is, for example, 10 kΩ.

  Between the terminator 16 (termination terminal 29) and the reception wiring 12 (reception terminal 22), the reception disconnection monitoring circuit 23 described above, a second switching element 42 as a disconnection output circuit, and a second switching circuit as a switching circuit The third switching element 43 and the resistor 44 are provided.

  The portion where the reception disconnection monitoring circuit 23, the second switching element 42 and the third switching element 43 are mounted is insulated from the other parts.

  When the relay disconnection monitoring circuit 25 confirms the disconnection of the relay wiring 11, the relay disconnection monitoring circuit 25 transmits the abnormality information (the disconnection information) to the control circuit 27. Then, the control circuit 27 opens the normally closed second switching element 42 connected in series to the terminator 16 in the case of the abnormality information. Thereby, the anomaly information is transmitted to the receiver 5. That is, as the abnormality information, the reception wiring 12 is disconnected, and the weak current based on the terminator 16 is not flowed to the reception wiring 12. At this time, a relay disconnection alarm (described later) indicating that the relay wiring 11 is disconnected is output.

  Also, when the relay disconnection monitoring circuit 25 receives a fire signal or the like from the wireless relay 4, the relay disconnection monitoring circuit 25 transmits the fire information to the control circuit 27. Then, in the case of fire information, the control circuit 27 closes the normally open third switching element 43 connected in parallel to the terminator 16 to perform a switching operation of the switching circuit. Thereby, fire information is transmitted to the receiver 5. The third switching element 43 is connected in series with a resistor 44 for adjusting an alarm current, which has a smaller resistance value than the terminator 16. Thus, the reception wiring 12 is connected as fire information. A substantially short circuit current flows larger than the weak current based on the terminator 16.

  The LED 31 as a display means is for displaying each information, and has a fire light and a disconnection light. Fire lights are what are displayed in the event of a fire. The disconnection lamp is displayed at the time of disconnection, and is an example of a relay disconnection alarm.

  The wiring terminal block 32 is a terminal block provided with the relay terminal 21, the reception terminal 22, the power supply terminal 28, and the termination terminal 29.

  Next, in FIG. 1, the receiver 5 is connected to the reception alarm unit (not shown) that outputs a reception disconnection alarm when the disconnection of the reception wiring 12 is confirmed, and is connected to the reception wiring 12. And a monitoring circuit (not shown) for monitoring a break in the circuit. The monitoring circuit detects a weak current based on the termination 16 flowing to the receiving wire 12 and when it detects that the weak current no longer flows, determines that the receiving wire 12 is broken. Thus, the monitoring circuit monitors the disconnection of the reception wiring 12. Then, when disconnection of the reception wiring 12 is confirmed, the reception alarm unit outputs a reception disconnection alarm indicating that the reception wiring 12 is disconnected.

  In the wireless relay power supply device 1, when the relay disconnection monitoring circuit 25 confirms disconnection of the relay wiring 11, the control circuit 27 operates the disconnection output circuit (opens the second switching element 42) to receive the reception wiring 12 Substantially, the monitoring circuit monitors the disconnection of the relay wiring 11 or the reception wiring 12, and the reception alarm unit outputs a reception disconnection alarm indicating that the relay wiring 11 or the reception wiring 12 is disconnected. You can say that. That is, it can be said that the receiver 5 outputs, as the disconnection alarm, a reception disconnection alarm that the wiring (the relay wiring 11 and / or the reception wiring 12) between the wireless relay 4 and the receiver 5 is disconnected. .

  The receiver 5 determines that fire information has been received when the aforementioned monitoring circuit (not shown) detects a substantially short circuit current based on the switching operation of the wireless relay power supply 1. And the above-mentioned reception alarm part (not shown) outputs a reception fire alarm.

  The receiver 5 may separately provide a circuit for detecting fire information as a monitoring circuit, a fire monitoring circuit, and a circuit for monitoring a disconnection of the reception wiring 12 as a disconnection monitoring circuit.

  Next, the operation of the wireless relay power supply 1 and the like will be described. First, an operation when a fire or the like occurs will be described. When the relay disconnection monitoring circuit 25 receives a fire signal or the like from the wireless relay 4 by detecting the substantially short circuit current based on the switching operation of the wireless relay 4, the relay disconnection monitoring circuit 25 receives the fire information. It transmits to the control circuit 27. Then, the control circuit 27 closes the third switching element 43 in the case of fire information. Thereby, fire information is transmitted to the receiver 5. Moreover, the control circuit 27 performs a fire display by the fire light of LED31.

  On the other hand, when the monitoring circuit (not shown) detects a substantially short circuit current based on the switching operation of the wireless relay power supply device 1, the receiver 5 determines that fire information has been received. Then, a reception alarm unit (not shown) outputs a reception fire alarm.

  Next, the operation when the relay wiring 11 is disconnected will be described. As described above, the relay disconnection monitoring circuit 25 detects the weak current based on the relay termination resistor 15 flowing through the relay wiring 11, and determines that the relay wiring 11 is disconnected when detecting that the weak current no longer flows. . When the relay disconnection monitoring circuit 25 confirms the disconnection of the relay wiring 11, the relay disconnection monitoring circuit 25 transmits the abnormality information (the disconnection information) to the control circuit 27. Then, the control circuit 27 opens the second switching element 42 in the case of the abnormality information. Thereby, the anomaly information is transmitted to the receiver 5. Further, the control circuit 27 performs a disconnection display by the disconnection light of the LED 31, and a relay disconnection alarm indicating that the relay wiring 11 is disconnected is output.

  On the other hand, in the receiver 5, when the monitoring circuit (not shown) detects the weak current based on the terminal 16 flowing to the receiving wire 12 and detects that the weak current no longer flows, the receiving wire 12 is broken. I judge that there is. When the disconnection of the reception wiring 12 is confirmed, the reception alarm unit (not shown) indicates that the wiring between the wireless relay 4 and the receiver 5 (in this case, the relay wiring 11) is broken. Output the reception disconnection alarm of.

  Next, an operation in the case where the reception wiring 12 is disconnected will be described. When the receiving wire 12 is disconnected, in the receiver 5, a monitoring circuit (not shown) detects a weak current based on the terminal 16 flowing to the receiving wire 12, and detects that the weak current has stopped flowing. , It is determined that the receiving wiring 12 is broken. Then, when disconnection of the reception wiring 12 is confirmed, the reception alarm unit displays a reception disconnection alarm indicating that the wiring between the wireless relay 4 and the receiver 5 (in this case, the reception wiring 12) is disconnected. Output.

  FIG. 3 is a block diagram showing an alarm system 2 according to Embodiment 1 of the present invention. Next, the operation of the wireless relay power supply device 1 will be described. As shown in FIG. 3, in the alarm system 2, the wireless relay 4 and the receiver 5 may be directly connected without passing through the wireless relay power supply device 1. For example, when the form of FIG. 1 is changed to the form of FIG. 3, the relay wiring 11 and the reception wiring 12 are removed from the power supply device 1 for wireless relay. Then, by connecting the relay wiring 11 and the reception wiring 12, the wireless relay 4 and the receiver 5 are directly connected without passing through the power supply device 1 for the wireless relay. Note that “the relay wiring 11 and the reception wiring 12 are connected” means that the wireless relay 4 and the receiver 5 are directly connected without passing through the power supply device 1 for the wireless relay. The present invention is not limited to the use of the wiring of the connection form shown in FIG.

  First, when the relay wiring 11 is removed, the relay disconnection monitoring circuit 25 detects a disconnection (non-connection) of the relay wiring 11 to output a relay disconnection alarm. However, when the receiving wire 12 is subsequently removed, the reception disconnection monitoring circuit 23 detects the disconnection (non-connection) of the receiving wire 12, whereby the pseudo termination resistor 24 is connected between the relay terminals 21. Thus, in place of the relay termination resistor 15, the pseudo termination resistor 24 is connected between the relay terminals 21. Therefore, when the reception wiring 12 is removed, the occurrence of the relay disconnection alarm is shut off.

  That is, when the receiving wiring 12 is removed, it is determined that the receiving wiring 12 is disconnected (not connected) by the reception disconnection monitoring circuit 23 because no current flows in itself, and the pseudo termination between the relay terminals 21 is performed. A resistor 24 is connected. Therefore, since the relay disconnection monitoring circuit 25 can detect a weak current based on the pseudo termination resistor 24 having the same resistance value instead of the relay termination resistor 15, the relay disconnection monitoring circuit 25 does not determine that the relay wiring 11 is a disconnection.

  As described above, according to the first embodiment (FIG. 3), the pseudo termination resistor 24 is connected between the relay terminals 21 when disconnection (non-connection) of the reception wiring 12 is confirmed in the reception disconnection monitoring circuit 23. Even if the relay wiring 11 is disconnected (even when not connected), the occurrence of the relay disconnection alarm is cut off. For this reason, when the alarm to the effect that the wiring (relay wiring 11) between the wireless relay devices 4 is broken is unnecessary, the generation of the alarm that the wiring is broken can be cut off.

  In the connection form of FIG. 3, when the monitoring circuit (not shown) detects a substantially short circuit current based on the switching operation of the wireless relay 4, the receiver 5 determines that fire information has been received. Also, in the receiver 5, the monitoring circuit (not shown) detects a weak current based on the relay termination resistance 15 flowing in the wiring (the reception wiring 12) between the wireless relay 4 and the receiver 5, When it is detected that the weak current no longer flows, it is determined that the wiring (reception wiring 12) between the wireless relay 4 and the receiver 5 is broken.

  In the first embodiment, in order to prevent the power supply device 1 for the wireless relay from alarming the disconnection (non-connection) of the relay wiring 11 in the connection form of FIG. It is performed based on the disconnection (non-connection) of the reception wiring 12. Here, if the connection of the pseudo termination resistor 24 is performed based on the disconnection (non-connection) of the relay wiring 11, the original function of notifying the disconnection of the relay wiring 11 in the connection form of FIG. 1 is lost. . For this reason, the connection of the pseudo termination resistor 24 in the connection form of FIG. On the other hand, in the case of FIG. 3, the disconnection of the wire (the receiving wire 12) directly connecting the wireless relay 4 and the receiver 5 is determined by the receiving alarm unit of the receiver 5 in the receiver 5, as described above. Receive disconnection alarm is output. For this reason, in FIG. 3, the disconnection of the wire (the receiving wire 12) directly connecting the wireless relay 4 and the receiver 5 can be confirmed on the receiver 5 side, and the whole system is abnormal (broken). There is no problem in informing the

  Also, conventionally, when the wireless relay and the receiver are directly connected without passing through the wireless relay power supply device, a pseudo-termination resistor is separately provided on the terminal block provided in the wireless relay power supply device. There is known a technique of externally attaching and interrupting the generation of an alarm indicating that a wire is broken when it is not necessary to warn that the wire is broken. However, in this case, whenever it is going to remove a wireless relay and a receiver from the power supply apparatus for wireless relays, the installation operation | work of pseudo-termination resistance is required, and it is complicated. In addition, since the pseudo termination resistor is a member different from the wireless repeater power supply device, the pseudo termination resistor may be lost.

  On the other hand, in the first embodiment, the wireless relay power supply device 1 includes the pseudo termination resistor 24. Then, when the receiving wiring 12 is removed, the pseudo termination resistor 24 is automatically connected between the relay terminals 21 by the reception disconnection monitoring circuit 23. For this reason, the operation | work which attaches the pseudo | simulation termination resistance 24 manually is unnecessary, and an operation man-hour can be reduced. In addition, since the pseudo termination resistor 24 is provided in the wireless repeater power supply device 1, it is possible to prevent the pseudo termination resistor 24 from being lost.

  In the connection form of FIG. 1, as an operation when the receiving wiring 12 is disconnected, the power supply apparatus 1 for wireless relays is disconnected from the receiving wiring 12 because no current flows in the receiving disconnection monitoring circuit 23. It is determined that the relay terminal 21 is not connected, and the pseudo terminal resistor 24 is connected to the relay terminal 21. Therefore, the relay disconnection monitoring circuit 25 is configured to detect a weak current based on the pseudo termination resistor 24 having the same resistance value instead of the relay termination resistor 15. Therefore, even if the relay wiring 11 is disconnected, the relay interconnection It does not judge that 11 is a disconnection.

  However, in the receiver 5, a monitoring circuit (not shown) detects that the weak current based on the terminal 16 flowing to the receiving wire 12 has stopped flowing, and determines that the receiving wire 12 is disconnected, and receives The alarm unit outputs a reception disconnection alarm that the wiring (in this case, the reception wiring 12) between the wireless relay 4 and the receiver 5 is disconnected.

  As described above, the receiver 5 outputs a reception disconnection alarm to the effect that the wire (either the relay wire 11 or the reception wire 12) between any of the wireless relay 4 and the receiver 5 is disconnected. Therefore, after that, each wiring check and replacement work will be performed promptly. Therefore, even if disconnection of the relay wiring 11 is not detected until the replacement work, there is no problem.

  DESCRIPTION OF SYMBOLS 1 Power supply device for wireless relays, 2 alarm system, 3 wireless sensors, 4 wireless relays, 5 receivers, 11 relay wiring, 12 reception wiring, 13 power supply wires, 14 spare power supplies, 14a panel switch, 14b battery Test circuit, 15 relay termination resistances, 16 terminations, 21 relay terminals, 22 reception terminals, 23 reception disconnection monitoring circuits, 24 pseudo termination resistances, 25 relay disconnection monitoring circuits, 26 power supply circuits, 27 control circuits, 28 power terminals, 29 Termination terminal, 31 LED, 32 wiring terminal block, 41 first switching element, 42 second switching element, 43 third switching element, 44 resistance.

Claims (3)

For the first device capable of relaying a signal from the first device to the receiver by supplying power to the first device and interposing between the first device and the receiver In the power supply,
A pair of first terminals connectable to the first device via a first wire;
A receiving terminal connectable to the receiver via a receiving wire;
A reception disconnection monitoring circuit connected to the reception terminal to monitor disconnection of the reception wiring;
A pseudo termination resistor connected between the first terminals when disconnection of the reception wiring is confirmed in the reception disconnection monitoring circuit;
A power supply device for a first device, comprising: A first wire disconnection monitoring circuit connected to the first terminal to monitor disconnection of the first wire;
A first alarm unit that outputs a disconnection alarm of a first wiring when a disconnection of the first wiring is confirmed in the first wiring disconnection monitoring circuit;
The power supply device according to claim 1, further comprising: The first device;
The receiver;
A first device power supply device according to claim 1 or 2;
The receiver is
An alarm system comprising: a reception alarm unit which outputs a reception disconnection alarm when the disconnection of the reception wiring is confirmed.

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