| Phenomenon |
Cause |
Solution |
| 1,The motor doesn't start. |
1) Haven't put through the power |
1) Check the switch, melt, every contact point as well as the tie-in of leading wire |
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2) The winding turns off. |
2) Heat the turnoff parts up to a certain temperature that insulation grade permit, soften the paint, then choose the wire-break, reweld and tie it up well, then paint and dry. |
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3) The winding earth or interturn short circuit |
3) The solution is the same as above, just only need to insulate on the earth or short circuit parts, and then paint and dry. |
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4) The wiring of windings is wrong |
4) Check the wiring diagram, connect well according to the correct method after heating up the ends (including binding, insulation and paint) |
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5) The melt is burned out
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5) Find out the reason and fix the breakdown, match the new melt according to the specification of motor |
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6) the wiring of control device is wrong |
6) adjusts the wiring |
| 2, After the motor is switched on, the melt is burnt out. |
1) single-phase starting |
1) Check the power wire, the leading wire, fuse, every contact points of switch and find out the broken wire or breakdown to repair. |
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2) The motor overload or is blocked. |
2) Adjust the load to the rated value, and get rid of the mechanical trouble |
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3) The melt section is too small. |
3) It doesn't work for the melt to the overload of motor, should choose the melt according to the following equation generally: Rated current of melt = Starting current/(2~3) |
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4) short circuit between the power and motor |
4) Check the short-circuit place and then repair. |
| 3, The motor doesn't start with humming soundafter switching on. |
1) The motor overload or is blocked. |
1) Check the equipment and fix the breakdown |
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2) Haven't put through the power completely |
2) Replace the melt of fuse; screw on the loose bolts; Find out the broken wire and trouble with the multi-meter and then repair. |
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3) The voltage is too low. |
3) if connect Y coupling by mistake instead of △ coupling, when the voltage is too low, should contact with the power supply department to solve, if voltage-dropping of power circuit is too large and cause the voltage is too low, should replace the thick cable. |
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4) For minitype motor, the lubricant is hard or the assembly is too tight |
4) Chooses the appropriate lubricant to improve the quality of assembly |
| 4, The crust of motorhas electricity. |
1) Make mistake for the power wire and the grounding wire. |
1) correct the mistake |
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2) The windings of motor are affected with damp, insulation is bad aging. |
2) Dry the motor, and replace the aging insulation. |
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3) The leading wire and junction box earth |
3) Wrap up or renewal the insulation of leading wire, repair the junction box. |
5, It is difficult to start the motor, but its rotating speed is lower than rated rotate speed after adding the rated load. |
1) The power voltage is too low |
1) Check the voltage of inputting end with the voltmeter or multi-meter and then handle with it. |
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2) Connect Y coupling by mistake instead of △ coupling |
2) Change them. |
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3) The cage rotor welds out or ruptures. |
3) Repair it after checking |
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4)The windings are too much when rerolling. |
4) Rerolling according to correct winding number. |
| 6, The insulated resistance is low |
1)The windings is affected with damp or is caught by rain. |
1) Heat or dry it. |
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2)The insulation of windings is aging |
2) May clean and dry it for using if can continue to use through checking. If insulation is aging and can't run safe, then need to replace the insulation. |
| 7, Send out the cacophony, abnormal while the motor is running. |
1) The bearing is worn out, with breakdown |
1) Overhaul or replace the new bearing |
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2) The iron cores of stator and rotor are loose. |
2) Check the vibration reason, reimpact the iron core. |
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3) The voltage is too high or unbalanced. |
3) Measure the voltage, find out the reasons and fix it. |
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4) The bearing lacks the lubricant |
4) Clean the bearing, add the lubricant and make it fill in 1/2~1/3 of the bearing room. |
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5) The fan runs into its cover or the air tunnel is stopped up. |
5) Repair the fan and cover, with correct size, clean up the air tunnel. |
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6) the air gap is uneven, the stator abrades the rotor each other. |
6) Adjust the air gap and improve the assembly quality |
8, The motor is superheating or smoking. |
1) The voltage of power is too high and makes the density of iron core supersaturate, and cause the temperature to be high. |
1) if the voltage surpasses the standard too much, should contact with the power supply department to solve. |
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2) The voltage of power is too low, the temperature of motor is too high under the rated load. |
2) If caused by the voltage of power wire, can replace more thick wire. If caused by the lower power voltage, can contact the power supply department, and enhance the power voltage |
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3) The iron cores of stator and rotor abrade each other. |
3) Check the reasons of trouble, if the gap between bearings exceeds the limit, then should replace the bearing; If the rotating axis is curving, then must straighten it, if iron core becomes loose or distort, should handle with it in time and fix the trouble. |
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4) The motor overloads or the mechanical resistance is too large and cause the motor to heat. |
4) Fix the mechanical breakdown, reduce the resistance, according to the indication of current, if surpass the rated current, must reduce the load and replace a motor of large capacity or limit the capacity. |
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5) It is frequent to start the motor or it is too much for the times of forward and reverse. |
5) Reduce the times of starting and forward and reverse times, or change the proper motor. |
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6) The fan is in trouble with bad ventilation. |
6) Check whether the fan is damaged, check whether the fan blade is distorted or unfixed well, when necessary, should replace the fan. |
| 9, The current is too unbalanced while the motor runs in. |
1)The power voltage is unbalanced |
- Measure the voltage and find out the reasons.
|
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2) The windings are in trouble, like as interturn short circuit, some winding is connected in reverse, etc. |
2) Disassemble the motor and check the pole and trouble, and then correct or fix the breakdown. |
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3) While rerolling, the numbers of three-phase windings are uneven. |
3) Reroll |
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