A, after electrify motor can't turn, but is ringing, and no smell and smoke.
1. The fault reason
(1) the power supply has been (at least two phase not tong);
(2) the melting silk fusing (at least two phase fusing);
(3) the flow relay the too small;
(4) control equipment wrong wiring.
2. Troubleshooting
(1) check the power supply circuit switch, melting silk, whether in the junction box a breakpoint, repair,;
(2) check melting model, fusing silk reason, change new investment silk;
(3) the set values and adjust relay motor cooperation;
(4) the correct wiring.

Second, after electrify motor not turn, and then melt silk burn off
1. The fault reason
(1) a photograph of power supply, or for a main circle opposite; the
(2) the stator winding alternate with short circuit;
(3) the stator winding grounding;
(4) the stator winding wiring error;
(5) a small section of the melt silk;
(5) the power cord short circuit or grounded.
2. Troubleshooting
(1) check whether there is a photograph not breaker together, can power supply circuit in a break; Eliminating reverse connect fault;
(2) the short-circuit point out to repair it;
(3) to eliminate grounding;
(4) found out by mistake, corrected;
(5) change melting silk;
(3) to eliminate take place.

Three, after electrify motor not turn with buzz
1. The fault reason
(1) the stator and the rotor winding there is open circuit (a phase break) or a power phase lose electric;
(2) lead wire winding beginning at the end of a faulty or winding at the internal;
(3) power supply circuit contacts, become loose, contact resistance;
(4) too big or rotor motor load stuck;
(5) the power supply voltage low;
6 small motors assembly is too tight or bearing grease in perfect;
7 bearing stuck.
2. Troubleshooting
(1) to find out breakpoint repair;
(2) check winding polarity; Judge winding end is correct;
(3) to tighten the screw loose connection, using a multimeter to judge whether the joint false meet to repair it;
(4) reducing load or find out and eliminate the machinery fault,
(5) is the rules also check the surface by law by mistake for Y; whether

Four, motor starting difficulties, rated load, motor speed below the rated speed more
1. The fault reason
(1) the power supply voltage low;
(2) the surface by law for the mistake by motor Y;
(3) of the rotor cage open welding or fault;
(4) the stator coil up, local at the wrong;
(3) to repair the motor winding circle number increase when too much;
(5) motor overloaded.
2. Troubleshooting
(1) the power supply voltage measurement, try to improve;
(2) the correct by law;
(3) check the welding and breakpoints and repair;
(4) found abrasive-cloth adhered by mistake, correct;
(5) restore correct circle number;
(6)and reducing load.

Five, the motor idle current imbalance, three-phase differ big
1. The fault reason (1) the heavy, stator three-phase winding circle number not equal; (2) the first pick the wrong end winding; (3) the power supply voltage is not balanced; (4) the winding.