Using LED lights do motor phase failure protection

  
Circuit as shown below, when the three-phase circuit in any one phase, star point balance is broken, small relay J is energized, an external control contact action, immediately
Using LED lights do motor phase failure protection - schematic

cut off the main circuit AC contactor coil power supply, the motor phase protection. Components using 5mm bright white light-emitting diodes (or yellow-green and red, correspond exactly to ABC three-phase), 1N4001 silicon diode, 2W22k resistance, small relay option HH52P-L plug-driven or used for light 5A AC220V Chint JZX-22F. Adjusting resistor, the light-emitting diode forward current around 15mA, the forward voltage drop of about 3.5V, to normal light. The main thing is to meet the current small relay, generally between 10 ~ 20mA. When the three-phase circuit in any one phase, star point balance is broken, position to rise to 190V voltage zero zero point. The 0:00 is vacant, not in contact with any of the zero line. The 190V voltage is applied to both ends of a small relay J, pull-in voltage greater than the minimum, and the action, on top of a red light-emitting diode light itself. These small components, cheap. Between 0:00 and N points, or small relay J ends, you can also add a small buzzer, or through the contact leads, large external alarm. Sound, light, motion, three things at the same time the alarm.




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