JPH04335497A - Test equipment for fire alarm device - Google Patents

Abstract

PURPOSE:To perform the operation test and the non-operation test of plural fire sensors on the fire receiver side with respect to a fire alarm device where plural on/off fire sensors are connected to a sensor line. CONSTITUTION:Plural fire sensors 12 provided with test terminals which are operated by application of a simulated test voltage are connected to the sensor line and test lines, and a successive connection device 3 which is connected to the test line in the succeeding stage at the time of the end of test is provided for each of plural fire sensors 2, and a fire receiver 1 is provided with a test voltage generating means which generates the operation test voltage and the non-operation test voltage, and test voltages are applied to test terminals of fire sensors through test lines and successive connection devices to perform the operation test and the non-operation test, and signals indicating the operation states of fire sensors outputted from successive connection devices to test lines are received to detect fire sensors which are judged to be defective by the non-operation test and fire sensors which are judged to be defective by the operation test.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test device for a fire alarm system, and more particularly to a test device capable of testing the operation and non-operation of a plurality of fire detectors.

0002

2. Description of the Related Art Fire detectors used in fire alarm systems are of the on-off type. In this on-off type fire detector, when a predetermined temperature and smoke concentration are detected, conduction is established between a pair of power and signal sensor lines extending from the receiver with low impedance. The receiver detects the operation of the sensor based on the current (voltage) of the fire alarm and issues a fire alarm. Therefore, fire detectors are adjusted to operate at a predetermined sensitivity. This is the predetermined detection voltage (current)
At a test voltage equivalent to , it is confirmed that the fire detector does not operate at level 1, and by confirming that it always operates at level 2, which exceeds level 1, it is confirmed that the sensitivity of this fire detector is within the specified range. It will be done. For example,
Japanese Utility Model Application Publication No. 59-147289 entitled "Testing device for ionization type smoke detector" describes test methods for operating and non-operating tests. In addition, the test signal of the test device is sequentially applied to the test terminal of the fire detector by the sequential feed device.
A fire alarm system that sequentially performs operational sensitivity tests has been proposed, for example, in Japanese Patent Application Laid-Open No. 52-42098, entitled "Fire Alarm System."

[0003] However, although such testing equipment can perform tests relatively easily during the manufacturing stage of fire detectors, once installed at the site, it is necessary to remove and test the fire detectors one by one. It takes time and effort. In addition, in the test method in which test signals are sequentially applied using a sequential feed device, the voltage between a pair of detector lines drops, and once a fire detector is activated, the power supply must be cut off and restored at the fire receiver side. The drawback was that it was not possible to move on to testing of fire detectors.

0004

[Problem to be solved by the invention] The problem to be solved is to inactivate the fire detector by sequentially applying test signals using a sequential feeder while the on-off type fire detector installed at the site is connected. The problem is that when testing and operating tests are performed, the fire receiver cannot detect the test results of the next fire detector unless it is restored every time one fire detector is tested.

[0005]

[Means for Solving the Problems] A test device for a fire alarm system of the present invention includes a fire receiver for monitoring and issuing an alarm, a pair of detector lines extending from the fire receiver, and a fire alarm system for detecting heat, smoke, etc. A plurality of fire detectors are equipped with test terminals that activate when the detection level of a fire phenomenon exceeds a predetermined value, conduct with low impedance, and test operating sensitivity with an externally applied test voltage; A signal indicating the operating state of the fire detector being tested is transmitted to the fire receiver via the test line, which is inserted into a test line extending from the fire receiver corresponding to each of the fire detectors. When the test is completed, the upper test line is connected to the lower test line. A test voltage generating means that generates a test voltage and an operational test voltage that must be activated, and during testing, a non-operating test voltage and an operational test voltage from the test voltage generating means are applied to the test line in this order, Non-operation test failure detection means for detecting the operating state of the fire detector during the non-operation test from a signal indicating the operating state of the fire detector detected from the test track; The present invention is characterized by comprising operation test failure detection means for detecting an inoperable state during an operation test from a signal shown.

[0006]

[Operation] In a fire alarm system in which multiple on/off type fire detectors are connected in parallel to a detector line extending from a fire receiver, a test signal is output from the fire receiver, and a sequential feeder is used to sequentially detect the fire detectors. Even if a non-operation test or an operation test is performed, the test results of each fire detector are detected on the fire receiver side without cutting off the power supply from the fire receiver and restoring the fire detector each time. You can know.

【Example】

An embodiment of the fire alarm device testing device of the present invention will be described in detail below with reference to the drawings. Figure 1 shows
1 is an overall block diagram showing an embodiment of a test device for a fire alarm device according to the present invention. This fire alarm system includes a fire receiver 1 that monitors and issues a fire alarm, a pair of sensor lines L and C extending from the fire receiver 1 to a warning area, a test line S, this sensor line L, A plurality of fire detectors 2 are connected between C and C via interference prevention diodes D1, and a plurality of fire detectors 2 are provided correspondingly to the plurality of fire detectors 2, and are connected to terminals P and test terminals T of the fire detectors 2. It is composed of a plurality of sequential feeding devices 3.

[0008] The operation of this test device for a fire alarm system constructed as described above will be explained. A test voltage (signal) from the fire receiver 1 is supplied to the sequential feed device 3 via the test line S. The test voltage is then applied to the test terminal T of the fire detector 2 via the progressive device 3. The test voltage from the fire receiver 2 is applied in the order of non-operation test voltage and operation test voltage to perform the test. The sequential feeder 3 outputs a signal to the test line S indicating the operating state of the fire detector 2 being tested. The fire receiver 1 detects the inoperative state by the inoperative test and the operating state by the operational test from the state of the test line S indicating the operating state from the fire detector 2.
The sensitivity is determined to be normal, and if it is not, it is displayed as poor sensitivity. First fire detector 2 closest to fire receiver 1
When the test is successfully completed, the sequential feed device 3 stops outputting the signal indicating the operating state of the fire detector 2 to the test line S, and the test line S is connected to the next (lower) test line S. In this way, the fire detector 2 is sequentially tested.

[0009] In this way, the upper limit test voltage at which a normal fire detector should not operate according to the inoperability test,
One fire detector 2 is connected to the lower limit test voltage that must operate if the fire detector is normal according to the operation test.
Sensitivity defects can be detected and displayed by applying the test voltage twice.

FIG. 2 is a block circuit diagram mainly showing an embodiment of the test control device of the fire receiver 1 shown in FIG. and a mono-multivibrator 12 that is triggered by the falling edge of the pulse of this pulse oscillator 11.
A relay 16 is energized by the output of the mono multivibrator 12 and has a normally open contact 161, a counter 13 counts the falling edge of the output pulse of the mono multivibrator 12, and a relay 16 is energized by the output from the output terminal A of the counter 13. a relay 17 equipped with a switching contact 171;
A power supply E1 that supplies power to the fire detector 2 during normal times, a relay 18 that detects the operating state of the fire detector 2, a power supply E2 for inoperation tests, a power supply E3 for operation tests, and a power supply E3 for backflow prevention. Fire detector 2 via test line S from diodes D2, D3, resistors R1 to R3 and transistor Q1
a detection circuit that detects the operating state of the counter 13, an AND circuit AN1 that ANDs the output terminal A of the counter 13 and the detection signal of the detection circuit, and an AND circuit AN1 that takes the AND between the output terminal A of the counter 13 and the detection signal of the detection circuit; AND circuit AN2 that takes the AND of
, a malfunction detector 14 that detects and displays malfunction of the fire detector 2 based on the output of the AND circuit AN1, and a malfunction detector 14 that detects and displays malfunction of the fire detector 2 based on the output of the AND circuit AN2. 15.

FIG. 3 is a block circuit diagram showing an embodiment of the sequential feeding device 3 and the fire detector 2 shown in FIG. It shows. This fire detector 2 has an internal ion chamber 2
1, an external ion chamber 22 into which outside air enters, a field effect transistor FT that performs impedance conversion of an intermediate electrode between the internal ion chamber 21 and the external ion chamber 22, and a resistor R4,
R5, a Zener diode ZD, and a thyristor SR. Further, the progressive feeding device 3 has a resistor R6
, R7, capacitors CA and CB, and diode D4,
D5, a flip-flop circuit FF for detecting the operation of the fire detector 2, analog switches AW1 and AW2 for controlling the connection between the fire detector 2 and the test line S, and an inverting circuit IN.

The operations of the test control circuit of the fire receiver 1, the fire detector 2, and the sequential feed device 3 constructed as described above will be explained based on the timing chart shown in FIG. Normally, the fire detector 2 is supplied with power at a predetermined voltage from the power source E1 of the fire receiver 1 via the relay 18, the detector lines L and C, and the diode D1. When smoke from a fire breaks out into the external ion chamber 22, the field effect transistor FT
The gate potential of R5 rises, current flows between the source and drain, and a voltage drop occurs across the resistor R5. When this voltage exceeds the Zener voltage of the Zener diode ZD, the thyristor S
A current flows through the gate of R, and the thyristor SR maintains conduction and enters the operating state. The sensitivity is determined by the resistance value of the resistor R5 and the Zener voltage of the Zener diode ZD, and is set to operate at a predetermined smoke density. Furthermore, when a test voltage from the fire receiver 1 is applied via the test line S to the connection point (test terminal T) between the external ion chamber 22 and the resistor R4, the potential of the intermediate electrode (gate electrode) increases. The state will be the same as when smoke is detected. A sensitivity test can be performed using a test voltage based on the relationship between the smoke density measured in advance and the potential of the intermediate electrode.

When performing an operation test and an inoperability test of the fire detector 2, the test control circuit shown in FIG. 2 is driven. The pulse oscillator 11 outputs a pulse W1 (FIG. 4) with a predetermined period. The mono-multivibrator 12 is triggered by the fall of this pulse W1 and outputs a relatively short pulse W2. This output energizes relay 16 to close its normally open contact 161 and apply power E1 to test line S via resistor R1. At this time, the capacitor CB of the forwarding device 3 is charged via the diode D4, and the fire detector 2
used as a power source. This is so that there is no problem even if another fire detector 2 is already activated and the sensor lines L and C are short-circuited and power is not supplied. The counter 13 is triggered by the falling edge of the output pulse W2 of the mono-multivibrator 12, and outputs the frequency-divided pulse W3 to the output terminal A. On the other hand, the output terminal B outputs an inverted pulse of the pulse W3. counter 1
Relay 17 is driven by pulse W3 from output terminal A of No. 3. The switching contact 171 is first connected to the power source E2 and then to the power source E3, and so on. Therefore, the test line S
A voltage waveform W4 is output.

The progressive device 3 switches the diode D when the voltage from the power source E1 is supplied to the test line S through the resistor R1.
4, the capacitor CB is charged. On the other hand, resistance R
Since the capacitor CA connected through the capacitor 6 is supplied from the power source E1 for a short time, the capacitor CA is not fully charged. Since the flip-flop circuit FF is reset when the power is turned on, the output terminal B is at a high level, the analog switch AW1 is in a conductive state, and the analog switch AW2 is in a cut-off state. Therefore, the power charged in the capacitor CB is supplied to the fire detector 2 via the resistor R7 and the diode D5, and even if power is not supplied between the detector lines L and C, the fire detector 2 can be monitored. When this power supply period ends, the inoperable test voltage of the power source E2 is supplied to the test line S. Since this time is relatively long, the test terminal T of the fire detector 2 is passed through the resistor 6 without being affected by the capacitor CA. is supplied to A normal fire detector 2 will not operate at this test voltage. When this inoperability test is completed, the power supply E1 is turned on again.
Power is supplied for a short period of time. Next, when an operation test voltage is supplied from the power source E3, the fire detector 2 is activated and conducts between the terminals P and E if the fire detector 2 is normal. When this operation test is completed, power is supplied again from the power source E1, but since the fire detector 2 is still operating, a resistor R1, test line S, diode D4, analog switch AW1, resistor R7, diode D5, Fire detector 2, detector line C
A series circuit is formed and current flows. When current flows through resistor R1, transistor Q1 becomes conductive, and resistor R3
A signal indicating that the fire detector 2 has been activated is emitted. This is a signal indicating the operating state of the fire detector 2 detected from the test line S. When the fire detector 2 is in the operating state, the input of the negative circuit IN is at a low level and the output is at a high level, so the flip-flop circuit FF is inverted and the output terminal B is at a low level, and the analog switch AW1 is then turned off and the analog switch AW2 is turned off. becomes conductive. The test line S is separated from the fire detector 2 and connected to the test line S in the subsequent (lower) stage. Also, the voltage of the test line S is the resistance R
Although the voltage decreases slightly due to the voltage divided by R1 and resistor R7, it does not affect the power supply to the fire detector 2.

If the fire detector 2 operates due to poor sensitivity during the non-operation test, a signal is generated in the resistor R3 and the non-operation test failure pulse X1 is outputted to the output W5 of the AND circuit AN2. When this pulse X1 is output, the inoperation failure detector 15 detects it and informs that the fire detector 2 has a sensitivity failure. During the operation test, if the sensitivity of the fire detector 2 is poor and it is inoperable, the operation signal pulse X2 is not detected at the output W6 of the AND circuit AN2. It is detected by the malfunction detector 14 in synchronization with W2 to notify the fire detector 2 of poor sensitivity.

[0016]

Effects of the Invention As explained above, the test device for a fire alarm system of the present invention sequentially performs an inoperation test and an operation test on a plurality of fire detectors, and cuts off the power of the fire detectors that have been activated. This has the effect of allowing the fire receiver to detect and know about poor sensitivity of the fire detector without having to restore the system.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a fire alarm device testing device of the present invention.

FIG. 2 is a block circuit diagram showing an embodiment of the fire receiver of FIG. 1;

FIG. 3 is a block circuit diagram showing one embodiment of the fire detector and sequential feeding device of FIG. 1;

FIG. 4 is a timing chart for explaining the operation of the test apparatus of the present invention.

[Explanation of symbols]

1 Fire receiver 2 Fire detector 3. Progressive feed device 11 Pulse oscillator 12 Mono multi vibrator 13 Counter 14 Malfunction detector 15　Inoperation failure detector 16 Relay 17 Relay 18 Relay 21 Internal ion chamber 22 External ion chamber E1 Power supply E2 Power supply for non-operation test voltage E3 Operation test voltage power supply D1 to D5 Diode R1 to R7 resistance Q1 Transistor AW1 Analog switch AW2 Analog switch CA Capacitor CB Capacitor FF flip flop FT field effect transistor ZD Zener diode SR Thyristor IN Negation circuit

Claims (1)

[Claims] Claim 1: A fire receiver that monitors and issues fire alarms, a pair of detector lines extending from the fire receiver, and a heat detector.
a plurality of fire detectors equipped with test terminals that activate when the detection level of fire phenomena such as smoke exceeds a predetermined value, conduct with low impedance, and test operating sensitivity with an externally applied test voltage; A signal is inserted into a test line extending from the fire receiver and corresponds to each of the plurality of fire detectors, and sends a signal indicating the operating state of the fire detector being tested through the test line. A plurality of sequential feed devices connect the upper test track to the lower test track when the test is completed, and the fire receiver is equipped with a fire alarm that will not operate if it is a normal fire detector. A test voltage generating means that generates a non-operating test voltage that must not be activated and an operational test voltage that must be activated, and during testing, applying the non-activating test voltage and the operational test voltage from the test voltage generating means to the test line in this order. and non-operation test failure detection means for detecting the operating state at the time of the non-operation test from a signal indicating the operating state of the fire detector detected from the test track;
A test device for a fire alarm system, characterized in that it is equipped with an operation test defect detection means for detecting an inoperable state during an operation test from a signal indicating the operating state of the fire detector detected from the test track.