A power supply voltage is normal, the electric pump. The insulating ability is good, but why electricity electric pump does not start? ( symptoms: electric pump is energized to have electric current sound or no sound and no signs to start )
The 1 power supply wiring to appear in open state;
The 2 main winding and auxiliary winding or open, followed by the bad contact;
The 3 capacitor or with switch contact is not closed, so that the auxiliary winding can not be energized to work;
The 4 starting capacitor terminal open circuit or the internal circuit breaker;
In 5 the interior of the pump chamber blocking dead or stuck around the impeller corrosion;
The 6 winding of the motor abnormalities or electric pump which parts of accidental damage;
Two. The power supply voltage is normal, after electrify electric pump start difficulties, and a buzzing sound and vibration, current is maintained at a certain value is not decreased. ( symptoms: electric pump to start slowly, noise, vibration, high current )
1 the heavy load;
2 motor rotor friction, the interior of the pump body and impeller friction or blocking formation blockage;
The 3 bearing is not working properly; ( cause poor assembly, bearing grease in bearing consolidation, bearing retainer or ball breakage ).
The 4 winding of the motor abnormalities; ( once the overload operation lead to phase interturn damaged, but not completely breakdown, burned )
5 pump chamber of the existence of a large number of air;
Three. After the electricity, power supply fuse soon fuse. ( symptoms: knife switch fuse fuse, leakage protector tripping immediately rejected, knife gate closed )
1 phase winding inter-turn short circuit phenomenon or electrical conductivity;
2 motor lead line grounding or connecting the presence of abnormal;
The 3 capacitor short circuit or electric pump is blocked, the instant starting current is suddenly increased by several times;
4 electric pump motor chamber inlet or other factors cause electrical conductive;
5 motor winding burned to ground on;
6 using the fuse and the electric pump does not match;
Four. Electric pump without any protection device, electric start, speed is lower than normal. ( symptoms: electric pump rotating speed less than ratings )
The 1 main winding with inter-turn short circuit or the bad contact of circuit;
The 2 main and auxiliary windings within the coil reverse fault; ( a circle copper wire )
The 3 bearing is damaged or electric pump load is too heavy;
4 motor winding function of aging but temporarily not breakdown phenomenon;
5 electrical conductive or machine cavity memory in water;
The 6 power supply voltage instability or input to the motor voltage is lower than the rated value;
Five. Electric pump run time, temperature rise. ( symptoms: fever, abnormal electric pump is soon hot, smoking )
The 1 main and auxiliary winding phase turns and short to ground;
The 2 main winding and auxiliary winding between internal short circuit fault;
After starting 3, capacitance due to fault, interference with auxiliary winding leads to the main winding can not work normally;
The 4 main winding and auxiliary winding grounding fault interaction;
The 5 capacitor is damaged or using the wrong size;
The 6 stator, rotor core mutual friction or bearing damage;
7 electric pump components exist card wipe phenomenon or heavy load;
8 pump current in overload operation;
