Motor can't start

1,motor does not turn and there is no sound: more than two phase or two phase power or winding circuit,first check the power supply voltage,if the balance of three-phase voltage,then fault in the motor itself,can detect the resistance of the three-phase winding of single phase capacitor start induction motor the motor,to find out the wire diesel generator winding.And 2,the motor does not turn but hum: measuring the motor terminal,if the balance of three phase voltage and rated voltage value,can judgment is serious overload,check the steps of: first take

the load,then the speed of the motor with a normal voice,which can determine overload or load

malfunction with the mechanical parts,if still won't turn,twist of the hand motor shaft are

available,and if it is tight or motionless,and three phase current,if the three phase current balance,but larger than the rating,the mechanical part of the motor was stuck,may lack of oil motor,bearing rust,or was badly damaged and end cover or oil cover too oblique,rotor and bore a collision sweep (bore) when turn the motor shaft by hand to feel struggled with a certain way or heard diesel generator periodically wiping,the chamber can be judged to sweep.

3,,the motor speed slowly and have a buzz: this kind of failure of shaft cooperates,if measured one phase current is zero,while the other two phase current is far higher than the rated current,that is two phase operation,and the reason is: circuit or power supply circuit,a phase or a motor winding

circuit. Whether the small capacity of the motor can be measured with a multimeter direct on and off. Medium capacity motor use much more due to winding wire and around many branch in parallel,which if broken several root or disconnect a parallel branch check up more troublesome,when such a situation usually adopts the method of phase current balance or resistance method. Use a bridge measuring the resistance of the three-phase winding resistance method,such as three-phase resistance percentage www.dongfeng-motor.com difference five above,a phase for breaking phase resistance is larger.