Three-phase AC servo motor is widely used, but through the long-term operation, a variety of faults will occur, timely judgment of the cause of the failure, the corresponding treatment, is to prevent the expansion of the fault, to ensure the normal operation of the equipment is an important task.

First, the motor can not rotate after the power is turned on, but there is no abnormal noise, no odor and smoke.

1, the cause of the failure ① power supply is not through (at least two phases are not through); ② fuse blown (at least two phases of the fuse); ③ overcurrent relay is set too small; ④ control equipment wiring errors.

2. Troubleshooting ① check the power circuit switch, fuse, junction box, whether there is a broken point, repair; ② check the fuse type, the reason for the fuse, change the new fuse; ③ adjust the setting value of the relay with the motor; ④ correct the wiring.

Second, the motor does not rotate after power on the buzzing sound

1, the cause of the failure ① rotor windings have a broken circuit (a phase of broken wire) or a phase of the power supply loss of power; ② the beginning and end of the winding lead line connected to the wrong winding or winding internal connection reversal; ③ power circuit contacts loose, contact resistance; ④ motor load or rotor jam; ⑤ power supply voltage is too low; ⑥ small motor assembly is too tight or bearing grease is too hard; ⑦ bearing jammed.

2. Troubleshooting ① identify the breakpoints to be repaired; ② check the polarity of the winding; determine whether the winding end is correct; ③ tighten the loose wiring screws, using a multimeter to determine whether the joints are false, to be repaired; ④ load shedding or to find out and eliminate the mechanical problems, ⑤ check whether the surface of the provisions of the connection is connected incorrectly; whether the power supply wire is too thin to make the voltage drop is too large, to be corrected; ⑥ reassembly to make the flexible; replacement of qualified grease; ⑦ repair bearings.

Repair the bearings.

Third, the motor starting difficulties, rated load, the motor speed is lower than the rated speed of more

1. Fault causes ① power supply voltage is too low; ② face connection method motor misconnection; ③ rotor weld or fracture; ④ rotor local coil misconnection, connection reversal; ③ repair the motor winding to increase the number of turns too much; ⑤ motor overload.

2. Troubleshooting ① measure the power supply voltage, try to improve; ② correct the connection; ③ check the weld and break and repair; ④ find out where the misconnection, to be corrected; ⑤ restore the correct number of turns; ⑥ load shedding.