Electric motors are always equipped with a magnetic starter, composed of a magnetic contactor and an overload relay. It protects the motor from burning out when the current drawn exceeds the setting of the overload relay by cutting the power supply.
Furthermore, motors draw more current during starting and draws even more when the load driven is heavy.
Check the following for early prevention of burning out of the motor windings:
- Motor windings
- Motor temperature
- Line current
- Motor noise
- Load
The usual cause in the rise of motor temperature, line current and noise is the wearing out of the motor bearings. When the bearings wear out, the motor has difficulty in driving the load and draws more current and temperature rises or the motor rotor touches the stator and causes a grinding effect that produces the noise. When the motor always stops, replace the motor bearings and check continuity of the motor terminals with its body. There should be no continuity between the motor body and its terminals, otherwise rewinding is necessary. In your case check the pump impeller for any obstruction.
Note: Continuity test is done using an ohmmeter. With continuity means zero resistance. No continuity means infinite resistance. You may actually need the help of a qualified electrician.
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