JPH05182087A - Method and device for connection test for sensor - Google Patents

Abstract

PURPOSE:To test a connection without removing a dust-proof cover with ease. CONSTITUTION:This device is provided with a sensor 1 having an operation display lamp 5, a receiver 10 having power source 12 feeding for the sensor 1, a connection line L1-C connecting a sensor 1 and a receiver 10, a voltage switching part 25 arranged on the side of the receiver and changing feeding voltage, a voltage detection part 20 detecting the change or feeding voltage and operation display lamp 5 which is successively lighted by the voltage detection part 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection test method and apparatus for sensors connected to a plurality of district lines.

[0002]

2. Description of the Related Art In a building such as a building, a large number of fire detectors are arranged in a plurality of fire warning areas for fire monitoring. As shown in FIG. 6, these detectors a _{1 to} a _N are signal lines L of respective district lines (hereinafter referred to as connection lines).
_{1 to} L _N- connected to the receiver b via the common line C. However, the connection mistake of the connecting line L-C, for example, sensor a ₁ to a connection line of the signal line L ₁ - if it is to be connected to the common line C, the signal line L of the sensing device a ₁ a connection line
₂ -The common line C may be connected. Then, the signal detection unit of the receiver b determines that the fire signal is received from the sensor a ₂ even though the fire is detected by the sensor a ₁ . Therefore, the location of the fire cannot be accurately known, and the fire-extinguishing activities are delayed and the initial fire extinguishing becomes difficult.

In order to solve such a problem, the following test method has been conventionally used. That is, after the installation of the sensor is completed, whether the smoke tester or the heating tester is brought close to the sensor and smoke or heat is applied to the sensor to send a fire signal to a predetermined receiver. I'm making a decision.

[0004]

The test method of the conventional example has the following problems. (1) The sensor is covered with a dustproof cover in order to prevent dust and the like from adhering during construction. However, when performing a smoke test, the dustproof cover cannot be tested unless the dustproof cover is removed. Therefore, if the test is performed before the completion of construction, the dust-proof cover is removed, and the dust generated during construction adheres to the sensor. (2) It is difficult to bring the smoke tester and the like close to the detector provided in a place where there is an obstacle near the high ceiling or the ceiling such as piping. for that reason,
The test cannot be performed easily and accurately.

In view of the above circumstances, an object of the present invention is to make it possible to easily perform a connection test without removing a dustproof cover.

[0006]

According to the present invention, there is provided a sensor having an energization confirmation means; a receiver having a power source for supplying power to the sensor; and a connection line connecting the sensor and the receiver. ;
The above-mentioned object is achieved by a voltage switching unit arranged on the receiver side for changing the power supply voltage; a voltage detection unit for detecting a change in the power supply voltage; and an energization confirmation unit operated by the voltage detection unit. I will try.

[0007]

Operation: When the voltage switching unit is operated, the voltage supplied to the sensor changes. When the voltage detector detects this change in voltage, the energization confirmation means operates. At this time, if the energization confirmation means does not operate, a wiring mistake occurs.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS.
The test is performed by lowering the value.
The fire detector is the signal line L _{1 of} the first connection line (district line).
It is connected to the receiver 10 via the common line C. In the fire detector 1, 2 is an ionization type, photoelectric type, thermal type, etc. fire detection part, 3 is a fire determination part, 4 is a transistor 4
A switching unit having a, 5 is an operation indicator lamp, and 6 is a constant voltage unit. Reference numeral 20 denotes a voltage detecting section, which includes a Zener diode 20a and transistors 20b and 20c, as shown in FIG. The receiver 10 is provided with a signal detection unit 11, a power supply 12 that supplies power to the sensor 1, and a voltage switching unit 25. The voltage switching unit 25 includes a Zener diode 27 and a switch 26, as shown in FIG. In this way, the power supplies of the detector and the receiver are connected to the plurality of connection lines (district lines), respectively.

The operation of this embodiment will be described. Normally, the switch 26 of the voltage switching unit 25 is off, and the switch 28 is also off because it is connected to the contact S ₁ . In this state, the power source 1 of the receiver 10
2 supplies power to the fire detector 1 via the first connection line L ₁ -C at a steady value, for example, 24V, and the Zener diode 20a of the voltage detection unit 20 is turned on. 20b is also on. for that reason,
Since the transistor 20c does not turn on, the operation indicator lamp 5 does not light up.

When a fire is detected by the fire detection unit 2 when a fire occurs, the fire determination unit 3 outputs and turns on the transistor 4a of the switching unit 4. Therefore, the operation indicator lamp 5 is continuously turned on and a fire signal is output to the signal detection unit 11 of the receiver 10 connected to the first line L ₁ -C.

During the connection test of the sensor, the voltage switching unit 25
Switch 26 is turned on and switch 28 is connected to contact S ₂ . Then, the power supply voltage becomes lower than the steady value of 24V. Therefore, the Zener diode 20a of the voltage detection unit 20 is turned off, and the transistor 20c is turned on. Therefore, the operation indicator lamp 5 is continuously turned on and the signal detection unit 11 of the receiver of the first line L ₁ -C is fired. The same large current as the signal is output. As a result, it can be seen that the power supply 12 of the receiver 10 is connected to the sensor 1, and it can be confirmed that the wiring is correct.

At this time, if the operation indicator lamp 5 does not light up, the sensor 1 is not connected to the receiver 10 through a predetermined connection line, and the power source of the receiver is connected through another connection line. Since it is connected, it can be seen that the wiring is wrong. For example, when the sensor 1 and the receiver 10 are to be connected to the signal line L ₁ -common line C of the connection line, and when they are connected to the signal line L _N -common line C of another connection line, the sensor Since the power supply voltage to 1 is a constant value of 24 V, the voltage detection unit 20 does not operate. Therefore, the operation indicator lamp 5 of the sensor 1 does not light up, and it can be seen that the connection is wrong. Therefore, the sensor 1 is reconnected to the signal line L ₁ -common line C of the connection line.

A second embodiment of the present invention will be described with reference to FIG. 3 and FIG. 4. The same reference numerals as those in the first embodiment have the same names and functions. The difference between the second embodiment and the first embodiment is that the test is performed by making the power supply voltage higher than the voltage of the power supply 12, that is, a steady value. In this embodiment, the voltage switching unit 35 has a voltage higher than that of the power supply 12, for example, 30V.
Is provided with a test power supply 36 and a switch 37, and the voltage detector 40 includes a Zener diode 40a and a transistor 40b.
And. Then, the switch 37 of the voltage switching unit 35
When the switch 38 is turned on and the switch 38 is connected to the contact S ₂ , the power supply voltage rises and the Zener diode 4 of the voltage detection unit 40 increases.
Since 0a is turned on and the transistor 40b is turned on, the operation indicator lamp 5 is turned on. At this time, the operation indicator 5
If is not lit, it means that the wiring is wrong.

The present invention can be applied not only to the fire detector but also to other detectors such as a gas detector, and can also be used for an analog detector, an addressable detector and the like. An energization indicator lamp may be used instead of the operation indicator lamp as a confirmation means for notifying the energization of the sensor, or an acoustic device such as a buzzer may be installed in the sensor together with the energization indicator lamp. The indicator lamp may be lit continuously or blinking. In addition, the voltage switching unit, instead of being built in the receiver,
It may be provided outside the receiver or in the vicinity of the sensor.
Alternatively, the voltage switching unit including the switches 28 and 38 may be detachable and connected to a terminal block or the like to which the connection line of the receiver is connected only during the test.

[0015]

Since the present invention is configured as described above, when the voltage switching unit is switched, the power supply voltage to the sensor changes, and the change is detected by the voltage detection unit. At this time, if the energization confirmation means is activated by the voltage detection unit, the wiring is normal, and if it is not activated, a wiring error has occurred. Since the sensor connection test can be performed only by operating the voltage switching unit in this way, unlike the conventional example, the test can be performed easily and reliably even when the sensor is covered with the dustproof cover.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a detailed view of the voltage detection unit of FIG.

3 is a detailed view of the voltage switching unit of FIG.

FIG. 4 is a block diagram showing a second embodiment of the present invention.

5 is a detailed view of the voltage detection unit of FIG. 4 and is a view corresponding to FIG.

FIG. 6 is a diagram showing a conventional example.

[Explanation of symbols]

 1 Ion-type fire detector 5 Operation indicator light (energization indicator light) 10 Receiver 12 Power supply 20 Voltage detection unit 25 Voltage switching unit L Signal line C Common line

Claims (8)

[Claims] 1. A method of supplying power to a sensor from a power source of a receiver through a plurality of connection lines; a step of operating a voltage switching unit on the receiver side to change the supply voltage of a desired connection line; A sensor connection test method comprising: a voltage detecting step of detecting a change in the voltage; and a step of activating an energization confirmation means of the sensor through the voltage detecting step. 2. A sensor provided with energization confirmation means; a receiver provided with a power supply for supplying power to the sensor; a connection line connecting the sensor and the receiver; provided on the receiver side. And a voltage switching unit for changing the power supply voltage; a voltage detection unit for detecting a change in the power supply voltage; and an energization confirmation unit operated by the voltage detection unit; apparatus. 3. The sensor connection test apparatus according to claim 2, wherein the energization confirmation means is an operation indicator light. 4. The connection test apparatus for the sensor according to claim 2, wherein the voltage switching unit is a switch for lowering the power supply voltage to the sensor below a steady value. 5. The sensor connection test apparatus according to claim 2, wherein the voltage switching section includes a Zener diode and a switch. 6. The sensor connection test apparatus according to claim 2, wherein the voltage switching unit is a switch for raising the power supply voltage to the sensor above a steady value. 7. The sensor connection test apparatus according to claim 2, wherein the voltage detection unit includes a Zener diode which is turned off when the voltage switching unit is turned on. 8. The connection test apparatus for a sensor according to claim 2, wherein the voltage detection unit lights the operation indicator lamp when the voltage switching unit is turned on.