XNUMX. The motor can't rotate after power on, but there is no abnormal noise, no strange smell and smoke

　　1. The cause of the failure:

　　The power is not connected (at least two phases are not connected)

　　Fuse blown (at least two phase blown)

　　The overcurrent relay is adjusted too small

　　Control device wiring error

　　2. Troubleshooting

　　Check whether there are breakpoints at the power circuit switch, fuse, and junction box, and repair it.

　　Check the fuse type, the cause of the fuse, and replace it with a new fuse

　　Adjust the setting value of the relay to cooperate with the motor

　　Correct the wiring

　　XNUMX. The motor does not rotate after power-on, and then the fuse is blown

　　1. The cause of the failure

　　One-phase power supply is missing, or the fixed and dry coil is connected oppositely

　　Short circuit between stator windings

　　Stator winding is grounded

　　Stator winding wiring error

　　Fuse section is too small

　　The power cord is shorted or grounded

　　2. Troubleshooting

　　Check whether one phase of the knife switch is not closed, or one phase of the power circuit is disconnected, and eliminate the reverse connection fault

　　Detect the short-circuit point and repair it

　　Eliminate grounding

　　Detect misconnections and correct them

　　Replace the fuse

　　Eliminate ground points

　　XNUMX. The motor does not rotate after power-on, and there is a buzzing sound

　　1. The cause of the failure:

　　There is an open circuit in the stator and rotor windings (one-phase disconnection) or one-phase power loss

　　The lead wire of the winding is disconnected from the beginning and the end is wrong or the winding is connected reverse

　　The power circuit contacts are loose and the contact resistance is large

　　The motor load is too large or the rotor is stuck

　　Power supply is low

　　The small motor assembly is too tight or the grease in the bearing is too hard

　　Bearing stuck

　　2. Troubleshooting

　　Find the breakpoint and fix it

　　Check the polarity of the winding; determine whether the end of the winding is correct

　　Tighten the loose wiring screws, use a multimeter to judge whether each connector is falsely connected, and repair it

　　Reduce load or detect and eliminate mechanical failures

　　Check whether the connection method is wrong, whether the voltage drop is too large due to the power wire is too thin, and correct it

　　Reassemble to make it flexible and replace qualified grease

　　Repair the bearing