Motor startup fuse fusing or thermal relay disconnect

1,fault inspection step:check whether the fuse is appropriate,check whether there is a short circuit

in the circuit,check whether the motor is short circuit or grounded. 2,acmotor2.blogspot.com ground fault detection:with a shaking table test of the motor winding insulation resistance,when the insulation resistance is lower than 0.2 ohms,serious motor be affected with damp be affected with damp.Check step by step with multimeter resistance or check lights,magnet prices if small or check lights indicating the darker the winding resistance seriously be affected with damp be affected with damp,need drying processing,if the resistance is zero or check light close to magnet motor normal brightness,then the nearly grounding.

Winding grounding outlet hole generally occurs in motor,power supply cord into the thread holes or winding outstretched notches for the latter situation,if discover the grounding is not serious,rotor and stator bamboo or insulating paper can be inserted between the stator core and winding,such as the check is not grounded,to bind up and continue to use after coated insulating varnish.3,the method of detecting short-circuit fault:windings turn-to-turn short circuit,short circuit situation is interphase short circuit.A use or multimeter and check for any two insulation resistance by megger are,such as found in 0.2 megohm once or zero is interphase short circuit.(check motor fuses all connections should be apart) when B measured three phase winding current,current big as short circuit phase C with short circuit detector check winding short-circuit D with bridge between three-phase winding resistance,little resistance to phase short circuit.