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Fault detection of automatic knife grinder

Create_time:2020-05-25 Views:138

Fault phenomenon 1:

      Can turn the knife normally, can't grind the knife.

      Analysis and maintenance: power on the test machine in a quiet environment, and operate all the function switches on the panel flexibly. At the same time, carefully observe each function indicator light, it is normal to turn on and off, carefully listen to the relay, travel switch, mechanical transmission parts, etc. in the machine, there is no abnormal sound, and no burnt smell. According to the above inspection, it can be determined that the control circuit is basically normal, so disconnect the power supply and open the front panel to check the internal fault point. When the power is on, the knife turning motor operates normally, but the knife grinding motor does not move at all. Take down the drive belt, and when the knife turning action is over, use your fingers to gently move the flywheel of the knife grinding motor, at this time, the motor can run at a constant speed. Measure the DC resistance of the main winding (m, C end) of the motor about 80, turn over the winding (S.C end) about 216, and (m, s end) about 295, which indicates that the motor is normal. Then measure the starting capacitance at both ends of C, and the capacity is positive infinite, which indicates that the capacitance has been open circuit. Remove it and see that the outer wall bulges a large package. After the capacitor of the same type was changed, the machine was tested, and the whole machine returned to normal operation.

     Special tips: in case of this kind of failure, do not power on the machine for a long time to avoid winding damage of motor winding due to heavy overload.



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