Motor protector circuit diagram 11

Published:2011/5/21 10:28:00 Author:Lucas | Keyword: motor protector | From:SeekIC

The motor protector circuit consists of capacitors C1 ~ C5, diodes VD1 ~ VD5, resistors R1, R2, zener diode VS, light-emitting diode VL, single-junction transistor VU and relay K, the circuit is shown as the chart. When the three-phase supply of L1 ~ L3 is in the normal, the junction point A on capacitors C1 ~ C3 has the lower AC voltage, the voltage is rectified by the VD1 ~ VD4, filtered by C4, so it is insufficient to turn on VS and VU, k does not pull in, the motor M operates normally. When the three-phase power is restored to normal, after a short delay VU deadline, K releases, then people can press the start button to restart the motor S2. R1 and R2 use 1/4W carbon film resistors or metal film resistors. C1 ~ C3 select CBB capacitors with the voltage being more than 400V: C4 and C5 select electrolytic capacitors, the withstand voltage of C4 is 25V, the withstand voltage of C5 is 16V. VD1 ~ VD5 use 1N4007 silicon rectifier diodes.



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