JPS61128783U

JPS61128783U -

Info

Publication number: JPS61128783U
Application number: JP965785U
Authority: JP
Priority date: 1985-01-25
Filing date: 1985-01-25
Publication date: 1986-08-12
Also published as: JPH0431674Y2

Description

[Brief explanation of drawings]

第１図は本考案の実施例の回路図、第２図は同
上の動作説明図、第３図は従来例の回路図、第４
図は同上の動作説明図であり、１ａは煙感知器、
１ｂは熱感知器、２は発信機、４は回線電圧検知
回路部、５はスイツチング回路部、６は高感度リ
レー、７は第１のタイマ回路部、８は第２のタイ
マ回路部、９は誤動作防止回路、ｒ_０はリレー接
点、Ｒｙ_１は受信リレー、ｌ_１〜ｌｎは感知器接
続線、ｌｃは共通線、ｒ_１１…は切換スイツチ、
Ｔｈはトランジスタ、Ｃ_１…はコンデンサ、Ｒ_１，Ｒ_２は抵抗である。 Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is an explanatory diagram of the same operation as above, Fig. 3 is a circuit diagram of a conventional example, and Fig. 4 is a circuit diagram of an embodiment of the present invention.
The figure is an explanatory diagram of the same operation as above, 1a is a smoke detector,
1b is a heat sensor, 2 is a transmitter, 4 is a line voltage detection circuit section, 5 is a switching circuit section, 6 is a high-sensitivity relay, 7 is a first timer circuit section, 8 is a second timer circuit section, 9 is a malfunction prevention circuit, _r0 is a relay contact, _Ry1 is a reception relay, _l1 to ln are sensor connection lines, lc is a common line, _r11 ... is a changeover switch,
Th is a transistor, C ₁ ... is a capacitor, R ₁ , R ₂ is a resistance.

Claims

[Scope of utility model registration request]

A line state detection means that generates an output when the voltage applied between the common line and the sensor connection line constituting the sensor line or the line current changes to a predetermined level, and the detected output of the line state detection means. a switching circuit unit that drives a switching means whose operation time is faster than that of the receiving relay; and a first circuit unit that starts a time-limited operation from the start of operation of the switching circuit unit and sets the switching circuit unit in an on-operable state until the time-up period elapses. and the first timer circuit section.
a second timer circuit section that starts a time-limited operation from the time-up of the timer circuit section and sets the switching circuit section in an OFF state until a preset time elapses, and when the switching circuit section drives the switching means; A malfunction prevention circuit configured to open at least the starting end portion of either the sensor connection line or the common line by the switching means, and a switching means for switching the malfunction prevention circuit between non-operation and operation. In the malfunction prevention device of the information system,
A transistor is inserted in series with the positive line of the power supply path of the malfunction prevention circuit, and a resistor that provides base bias is connected between the collector and base of the transistor, and between the base of the transistor and the negative line of the power supply path. Multiple series circuits of the normally open side of the changeover switch switched by the reception relay corresponding to each line and the capacitor are connected according to the number of reception relays, and a discharge circuit is connected between the normally closed side of each changeover switch and the capacitor. A malfunction prevention device for fire alarm systems that features a resistor connection.