JPS619793A - Testing circuit for fire alarm - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to a test circuit for inspecting a fire alarm.

[Background Art 1 A fire alarm system is usually equipped with a test circuit as shown in FIG. 3(a)1. In the same figure, A, A2A3 are detection circuits that operate by detecting the line short circuit signal from the fire detector, and in this example, when each detection circuit operates, the built-in relay activates the relay contacts a+a2a) of the sub-reception tf11B. When activated, the indicator lamp lights up. When checking the operation of a fire alarm, the operation of all detection circuits is checked by turning on the test switch Su+ and switching the rotary switch R3 one after another.For models with a large number of lines, this rotary switch The operation was extremely troublesome. In addition, some small fire alarms that repeat only a few times check the operation of all lines at the same time using the test switch 5III, as shown in Figure (b). The disadvantage is that even if you make a mistake and the order is swapped, you won't know.

[Object of the Invention] The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a fire alarm system that can sequentially confirm the operation of all detection circuits by operating a single switch. To provide test circuits for the machine.

[Disclosure of the Invention] The present invention provides a fire alarm system that includes a plurality of detection circuits that detect line-to-line short circuit signals from a fire detector, and a means for checking the operation of each detection circuit. The signal input terminals of each are connected to one test switch via a diode and a relay contact, and a delay relay is connected to the output terminal of each detection circuit, with the delay relay connected to the first detection circuit. The relay contact connected to the second detection path is operated, and all detection circuits are similarly operated in a sequential chain.

FIG. 1 shows an embodiment of the circuit of the present invention. In the figure, detection circuits A and A2A3 each supply power current to the fire detector through signal lines, and when each fire detector detects a fire, it issues an alarm to the fire alarm by shorting the signal line. Detection circuit A + A 2 A
3 is activated by detecting this inter-line short circuit signal, and lights up the district lights L and L2L installed in the fire alarm body, or sends a transfer signal to the sub-receiver B to locate the location of the fire. Performs display and control of disaster prevention equipment. The signal input terminals of these detection circuits A1A2A3... are diodes D, D2D3... and relay contact r1r, respectively.
2... to one test switch 5Ill, and is sequentially inserted into the adjacent line by delay relays R, R2... provided at the output end of each detection circuit A IA 2 A 3. relay contacts rlr2... are activated. R is a current limiting resistor. Note that only the diode D is connected to the first line, that is, the input end of the detection circuit A1, and no relay contact is connected.

FIG. 2 is a time chart showing the operation of the circuit of the present invention. Now t. When the test switch SW is turned on at this point, the input terminal of the detection circuit A1 is short-circuited by the diode D1 and the current limiting resistor R, and the detection circuit A is activated and a detection signal is output to its output terminal. Ru. As a result, the delay relay R is delayed by a certain time T and at the 11th point in time.
1 operates, lights up district light 1-1, and receives secondary reception v
f9. A transfer signal is sent to B to activate relay contact a, and at the same time, relay contact r1 of the adjacent line is turned on. When this relay contact r1 is turned on, a test signal is input to the second detection circuit A2, and the output of the detection circuit A2 turns on the district light L2 at time t2 one hour later and activates the relay contact a2. do. In this way, all the detection circuits operate in sequence, and the operation of each detection circuit is confirmed by means such as district lights or indicator lights of the sub-receiver.

[Effects of the Invention] As described above, in the present invention, the signal input terminal of each detection circuit is connected to one test switch via a diode and a relay contact, and the output terminal of each detection circuit is connected to a delay terminal. The relay is connected, and the delay relay connected to the first detection circuit operates the second detection circuit - two connected relay contacts, and in the same way, all detection circuits are operated in a sequential chain. This allows you to sequentially check the operation of each detection circuit by operating the switch once, and also allows you to check the correspondence between each detection circuit and indicator lights or alarms.
This has the advantage that there is no risk of overlooking wiring errors during test runs or maintenance.

There is an advantage.

[Brief explanation of drawings]

FIG. 1 shows an example of the present invention between block circuits and a second
The figure is a time chart showing the same operation as above, and the third figure is (,)
and (b) is a block circuit diagram showing a conventional example. A1A2A3 is the detection circuit, D + D 2 D 3 is the diode, L, L2L are the district lights, R, R2R, are the delay relays, a1a2a3 and r+r2r: + are the contacts of the delay relay, SW is the test switch, R is the current limiter resistance, B
is a secondary receiver. Agent Patent Attorney Ishi 1) Chief 7 Figure 1 Figure 2 to t+↑2 Figure 3 (CI) (b)

Claims (1)

[Claims] (1) In a fire alarm system equipped with a plurality of detection circuits for detecting line-to-line short circuit signals from a fire detector and means for checking the operation of each detection circuit, the signal input terminal of each detection circuit is connected to a diode and It is connected to one test switch via a relay contact, and a delay relay is connected to the output end of each detection circuit, so that the delay relay connected to the first detection circuit is connected to the second detection circuit. 1. A test circuit for a fire alarm system, characterized in that a relay contact is operated, and all detection circuits are sequentially operated in a chain manner in the same manner.