Using LED lights do motor phase failure protection


Posted on Mar 28, 2007

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
Click here to download the full size of the above Circuit.

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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