Today Kuntai Electrical told you a high-pressure fan on the motor fault check method:

(1) external observation method. Observe the junction box, winding the end of whether the burning, winding overheating left dark brown, and smell. The following are the same as the "

(2) the temperature test. No-load operation for 20 minutes (found abnormal should immediately stop), by hand back the winding parts of the part is more than the normal temperature. (3) power test method. Measured with ammeter, if a phase current is too large, indicating that the phase has a short circuit. The following are the same as the "

(4) bridge inspection. Measuring a winding DC resistance, the general difference should not exceed 5%, such as more than the resistance of a small phase with a short circuit failure. (5) short-circuit detectors method. The measured winding has a short circuit, then the steel will produce vibration. The following are the same as the "

(6) multimeter or megger. Measure the insulation resistance of any two-phase winding, if the reading is very small or zero, indicating that the two-phase winding with a short circuit. The following are the same as the "

(7) voltage drop method. The three windings in series after the access to low-voltage safe AC, measured a small group of short circuit failure. The following are the same as the "

(8) current method. Motor no-load operation, first measure the three-phase current, in the exchange of two-phase measurement and comparison, if not with the power exchange and change, the larger current phase winding has a short circuit.