1. In addition to the lack of phase, the reasons for burning the motor are
A, the load is too heavy;
B. Motor bearing is damaged;
C. the brake is not working, in operation, there is no disengagement or poor contact of the electromagnetic coil, resulting in sometimes power failure, locking the brake drum.
2. Reasons for phase loss:
A. Contactor contacts are frequently started and quickly ablated. Contact springs and plastic burning deformation at the contacts will make the contact position insufficient, resulting in phase loss.
B. The fuse is too small to cause heating and burning phase loss;
C. Poor power contact causes phase loss;
D. Poor contact of incoming wire of motor.
E. Install automatic air switch and thermal overcurrent protector with high sensitivity, and install open-phase controller to effectively prevent it.
3. the lack of phase protector protection for the lack of phase is very spiritual
Once missing phase, it can immediately disconnect the contactor, the price is not expensive, generally only 40- 50 yuan. The original control circuit start line through its group of normally closed contacts will be completed.
