| 摘要 |
The present invention is a phase loss protector for a three phase motor supplied by a three phase power source. A three phase motor has three main power legs, L1, L2 and L3, going in. Two of the three legs power the stepdown transformer that supplies a controller. The controller ensures power does not reach the three phase motor when L3 is not operating. If L3 loses power, a controller relay will not supply power to a power coil that supplies generally open contact points, shutting down power to the three phase motor. If L1 loses power, the transformer will not provide power for the controller to operate. If L2 loses power, the transformer will not provide power to the controller and the controller relay will not supply power to the power coil, again shutting down power to the three phase motor.
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