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Automotive Braking Air Under Pressure Protector Two

2016-09-14 10:09  
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Automotive Braking Air Under Pressure Protector Two
Automotive Braking Air Under Pressure Protector Two
Automotive Braking Air Under Pressure Protector Two
Work of the circuit The circuit consists of air pressure sensor SPl, oil pressure sensor SP2, auto ignition switch Sl, clutch switch S2, buzzer HA, relay K, audio integrated circuit IC, transistor V, diode VDl-VD3, resistors Rl-R4, capacitors Cl and C2 and light HLl and HL2. (It is showed in picture 7-154.) When the pressure of the braking air and the engine oil is normal, the contacts inside sensor SP1 and sensor SP2 releases. This circuit stands by. When the pressure of the braking air and the engine oil is low, the contact inside sensor SP1 or sensor SP2 closes to make HL1 and VD2 or HL2 and VD3 on. And the relay K closes and the normally close contact cut off the +12V work power to extinguish the engine. At the same time IC works to make HA send out alarm.