| 摘要 |
PURPOSE: A control panel alarm signal transmitting circuit is provided to drive an alarm system of high output, maintain a sufficient distance between contact points and confirm whether or not a normal operation of a sensor is carried out through an LED. CONSTITUTION: Alarm systems(14,15) include alarm and warning lamps. An alarm signal transmitting apparatus(20) is connected to a power input terminal, a sensor terminal and an alarm output terminal of a control panel. The alarm signal transmitting apparatus(20) includes the first relay(23), the second relay(35), a partial circuit(33), the first diode(21) and the second diode(22) for rectifying and preventing a back current, a condenser(24) for increasing a relay driving current, a reset button(40), test switches(36,38) and a serial circuit(34). The first diode(21) for rectification rectifies a voltage on both ends of AC input terminals(1,2). The rectified DC voltage is collected in the condenser(24). The collected voltage is applied to the first relay(23) and the second relay(35) through a temperature sensor(12) and a fume sensor(13) connected to sensor input terminals(5,7) and sensor input terminals(5,6). The partial circuit(33) includes resistances(27,28), and divides a DC voltage inputted to DC input terminals(3,4) according to a resistance ratio.
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